SAFETY AND RELIEF BRONZE CATALOG

Transcription

1 SAFETY AND RELIEF BRONZE CATALOG

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3 ÍNDICE Introduction walworth Company... 4 walworth Engineering Control... 5 WALWORTH Quality SYstem... 5 Walworth bronze Pressure Safety and Relief Valves WALWORTH BRONZE Pressure SAFETY VALVES Model2B WALWORTH BRONZE PRESSURE SAFETY VALVES MODEL 2B POUNDS PER HOUR SATURATED STEAM AT 3% OVERPRESSURE ASME B and PVC, Section I Rating Edition. POUND PER HOUR SATURATED STEAM AT 10% OVERPRESSURE ASME B and PVC, Section I Rating Edition. STANDARD CUBIC FEET PER MINUTE OF AIR (15.6ºC = 60ºF) AT 10% OVERPRESSURE ASME B and PVC, Section I Rating Edition. OVERPRESSURE FACTORS FOR STEAM, AIR OR GAS SAFETY VALVES PIPE CAPACITY FOR MODELS 2B10 & 2B APPLICATION AND SELECTION FOR MODELS 2B10 & 2B WALWORTH BRONZE RELIEF VALVES MODELS 2B20 & 2B GALLONS OF WATER PER MINUTE AT 25% OVERPRESSURE ASME B and PVC, Section VIII Rating Edition. ENGINEERING DATA APPLICATION AND SELECTION FOR MODELS 2B20 Y 2B TEMPERATURE CONVERSION TABLE DESIGN BASIS HOW TO ORDER GENERAL TERMS AND CONDITIONS

4 WALWORTH WALWORTH is one of the world s most comprehensive industrial valve manufacturers. Founded in 19th century by James Walworth, the Company has consistently dedicated itself to improvements in design and manufacturing of an array of valves exceptionally suited for the world s fluid control sector. We satisfy all end use industries and comprehensive customer requirements by adhering to the most demanding quality standards. WALWORTH relies on its broad experience in supplying valves to the petrochemical, oil & gas, petroleum, power generation, pulp and paper, cryogenic and geothermal industries, among others. Over the years, Walworth has produced over 40,000 different types of products and serves as a global supplier to various markets utilizing the expertise of over 500 trained employees. Our manufacturing system includes: utilization of Company directed raw material warehouses; modern and newly acquired specialized machinery; welding processes such as SMAW, GMAW, SAW, PAW; assembly testing for all low pressure, high pressure, and at low or high temperatures; painting and coating processes; export crating and shipment. WALWORTH is capable of providing the world s most comprehensive industrial valve line to the North American, Central American, South American, European and African markets. WALWORTH is proud to meet and satisfy the precise demands of our customers throughout the world by providing a quality product, competitive cost, and excellent service. WALWORTH VALUES MISSION WALWORTH manufactures and supplies world-class valves and components for the flow control industry through exceptional service, competitive pricing, and consistently, on-time deliveries. VISION To be the world leader of unparalleled valve manufacturing and supply, WALWORTH: Set the standard for product quality in the flow control industry. Exceed the service expectations of our customers. Forge enduring relationships with customers, team members, and community. Hire, develop, and retain experienced and dedicated team members. 4

5 WALWORTH ENGINEERING CONTROL WALWORTH products are manufactured following the strict international standards recognized all over the world, such as API, ANSI, ASME, ASTM, MSS, NACE, AWWA, BSI, CSA, among others. Our Engineering team consistently monitors updates to these standards and incorporates any applicable changes that affect the design, regulations and/or performance of our products. Our designs are made using the most advanced technology and equipment, finite elements, and CAD system programs to ensure proper assembly and performance. From conception to calculation to detailed drawings for manufacturers, WALWORTH is a leader in development of new products that meet the needs of the current valve market. WALWORTH QUALITY SYSTEM Throughout the years, WALWORTH has developed its Quality System which is an integral part of our manufacturing policy. Our primary goal is to provide products that meet and exceed market standards. In this sense, WALWORTH is an ISO-9001 Audited and Certified Company that has achieved major certifications worldwide. Our system includes the selection of raw materials from approved vendors, and rigorous oversight of our manufacturing process that is vital to quality control. The use of serial numbers allows WALWORTH the ability to not only ensure the quality of components used but to monitor and trace the fabrication process as well. Certificate API-6D No. 6D-0097 issued by American Petroleum Institute to apply on Gate valves, Plug valves, Ball valves and Check valves manufactured in accordance with API-6D specification. Certificate API-6A No. 6A-0234 from American Petroleum Institute to apply on valves at PSI, 1 through

6 Certificate ISO-9001 No issued by American Petroleum Institute since April Certificate as per PED 97/23/EC Module H to stamp CE products. Certificate of Reliable Supplier No. 199/07 issued by CFE in accordance with ISO-9001 Quality Assurance System. Certificate NMX-CC-9001 (Mexican Standards ISO-9001) No. 0552/2007 issued by PEMEX in accordance with ISO-9001 Quality Assurance System. 6

7 In addition to the Quality System Certifications, walworth has been awarded with the following specific product certifications: TA Luft Certificate (Fugitive Emission) Approval ISO-5211 Top Flange, Anti-Static Device. Certificates of Ultra Low Fugitive Emissions No , 8 & 16 in accordance with ISO Industrial Valves - Measurement, Test and Qualification Procedures for Fugitive Emissions Part 1: Classification System and Qualification Procedures for Type Testing of Valves. Fire Test Certificate No. 04/04 in accordance with API-6FA and API Standard API-607 for Trunnion Ball Valves in accordance with API-6D. 7

8 Emissions after 500 cycles at ambient and 350 F issued by Yarmouth Research and Technology Lab for 3 inch Class 300 Gate Valve After 500 cycles the measurement result was less than 50 ppm. Certificate API-594 No issued by American Petroleum Institute to apply on Check Valves-Type A; Check Valves Type B manufactured in accordance with API-594 specification. Emissions after 500 cycles at ambient and 350 F issued by Yarmouth Research and Technology Lab for 8 inch Class 300 Gate Valve After 500 cycles the measurement result was less than 50 ppm. API-600 Certificate No issued by American Petroleum Institute to apply on Bolted Bonnet Steel Gate Valves manufactured in accordance with API-600 specification. Emissions after 500 cycles at ambient and 350 F issued by Yarmouth Research and Technology Lab for 16 inch Class 150 Gate Valve After 500 cycles the measurement result was less than 50 ppm. API-602 Certificate No issued by American Petroleum Institute to apply on Compact Steel Gate Valves, Compact Steel Globe Valves, and Compact Steel Check Valves manufactured in accordance with API-602 specification. 8

9 QUALITY CONTROL EQUIPMENT In order to assure that WALWORTH products comply with international quality standards, in-house equipment is kept for monitoring control. Some of this equipment includes: X-Ray Examination Equipment. WALWORTH has its own Ir-92 source in-house for the radiographic examination (RT) of castings from up to 2 1/2 wall thickness to verify the soundness of the casting raw material. PMI Equipment. A new generation of Positive Material Identification Equipment gives WALWORTH the capability to perform quick chemical analysis on incoming raw materials and on pieces after assembly, to certify that materials used were produced and assembled in accordance with WALWORTH s and our Customer s specifications. Magnetic Particle Test. On a random basis for standard products or when a Customer requests MT Certification, WALWORTH has Magnetic Particle Test Equipment to perform on ferromagnetic materials. Penetrant Test Examination. WALWORTH has the personnel and materials to perform PT examination by solvent removable or water washable techniques. NDT personnel are ASNT Certified. Test Loop. A complete Laboratory Test loop exists for design validation of WALWORTH products. The test is performed at maximum design pressure, advances the valves from 3000 to 5000 cycles, and requires more than four months to complete. Pressure Gradient Test Loop. This test exposes Plug valves to the extremes of both positive and negative pressure gradients to verify that the plug in a balanced plug design will prevent lock-up in the body. 9

10 Metrology Laboratory. WALWORTH developed a calibration and/or verification system in all of the equipment used in its facilities. This ensures our ability to trace measurements, control products, and comply with international standards. Fire Test Facilities. WALWORTH has the facilities to perform fire tests in accordance with API requirements. The test exposes the valve to a fire flame at 1400 to 1800 F (761 to 980 C) to verify proper seal of the valve. Low Fugitive Emissions Test. This test is performed when a Customer requires low fugitive emissions certification. Our Lab has its own LFE test equipment that is capable of measuring less than 20 ppm in both static and mechanical conditions at either ambient temperature or thermal cycle operations. Ultrasonic Testing Equipment. Using ultrasonic techniques, we can detect sub surface flaws in materials and evaluate castings and forgings that cannot be radiographed. In addition, we utilize these techniques to measure the wall thickness of castings and forgings. Tensile Test Equipment. We use this equipment to verify the mechanical properties of materials used for manufacturing. WALWORTH tests samples on a random basis even though we receive MTRs from our suppliers and foundries. Hardness Test Equipments.- In both lab and shop tests, WALWORTH uses hardness tester equipment, such as Rockwell B, C Brinell or Vickers, to ensure compliance with specifications. 10

11 WALWORTH BRONZE PRESSURE SAFETY AND RELIEF VALVES These valves work to release overpressure in a piping system or a vessel. WALWORTH offers these kinds of valves as a solution for the automatic release of pressure from boilers, pressure vessels or other systems when the pressure or temperature exceeds preset limits. WALWORTH offers the following types of valves: a) Safety Valves. A pressure safety valve is characterized by rapid opening and closing and normally used to relieve compressible fluids. These valves are made from Bronze and used for gas, air, and steam. Its main use is to relieve the pressure from systems such as boilers, autoclaves, compressors, steam generators, pressure vessels, bronze air or gas pipelines. b) Relief Valves. A pressure relief valve characterized by gradual opening or closing, generally proportional to the increase or decrease in pressure system. This type of valve is typically made from Bronze and used on non-compressible fluids service. Its purpose is to release overpressure, protecting the equipment or system from damage. It is commonly used in tanks, pipelines or other vessels where a big relief capacity is not required. WALWORTH offers this product line in the following materials: a) Bronze as per ASTM B62 grade Interior materials available: a) Bronze (naval brass) b) Stainless Steel (SS304 & SS316) Design Features For Safety Valves (gas or steam service) Lateral discharge (to the pipeline, the recovery line, or the atmosphere) NPT male threaded input, in accordance with ANSI B NPT female threaded output, in accordance with ANSI B Minimum calibration pressure 5 PSIG (0.35 Kg./cm 2) Maximum operation pressure with steam 250 PSIG (17.58 Kg/cm 2 ) to 300 PSIG (24.61 Kg/cm 2 ) Maximum operation pressure with air or gas 300 PSIG (21.10 Kg/cm 2 ) to 350 PSIG (24.61 Kg/cm 2 ) Available in soft seat trim For Relief Valves (non corrosive bronze liquid service) Lateral discharge (to the pipeline or the recovery line) NPT male threaded inlet connection, in accordance with ANSI B NPT female threaded connection, in accordance with ANSI B Minimum calibration pressure 5 PSIG (0.35 Kg./cm 2 ) Maximum operation pressure (except 3 ): 300 PSIG (21.10 Kg./cm 2 ), for 3 : 150 PSIG (10.55 Kg/cm 2 ) Product Range Type Size Maximum pressure calibration Ends Bronze Safety Valves 1/2" to 2 1/2" 250 to 300 PSIG (steam), 350 (air or gas) Threaded NPT (male-female) Bronze Relief Valves 1/2" to 3" 300 PSIG Except 3 which is 150 PSIG. Threaded NPT (male-female) 11

12 WALWORTH BRONZE PRESSURE SAFETY VALVES MODEL 2B10 Design Features 1 Base. Designed according to the disc in order to keep the operating pressure and valve hermeticism. This component complies with the input diameter given by the Standard. 2 Disc. Ensures operating pressure and hermeticism of the valve. Both, disc and base have polished finish on their seal areas to guarantee valve hermeticism. 3 Upper adjusting ring. It regulates the required shooting pressure of the valve (simmer) lower than 2% of the calibrating pressure. 4 Lower adjusting ring. It regulates required pressure to the close (blow down) lower than 10% of the calibrating pressure. 5 Compression screw. Its purpose is to adjust the spring and calibrate the valve. Its spheric end stabilizes and keeps aligned the components which work under pressure in its construction axis. 6 Spring. The spring is made from carbon steel coated with cadmium or zinc. 7 Adjusting ring bolts. The adjusting ring bolts immobilize each ring. This guarantees that the valve might not present any change in calibration due to a vibration or hit during operating process. 8 Inlet. NPT inlet male threaded connection as per ASME/ANSI B Outlet. NPT outlet female threaded connection as per ASME/ ANSI B Spindle. It is designed to achieve the alignment of internal parts and for the manual operation of the valve. 11 Lever. The lever is designed in one piece to make operation of the valve easier. It is designed for manual operation in service and to verify the valve performance, it is recommended to operate it with a pressure minimum of 75% of the adjusting/calibration pressure in order to avoid seal areas damage. 5 Compression screw 10 Spindle 11 Lever 6 Spring 3 Upper adjusting ring Disc 2 Adjusting ring bolts 7 Base 1 9 Female threaded connection Male threaded connection 8 4 Lower adjusting ring 12

13 WALWORTH BRONZE PRESSURE SAFETY VALVES MODEL 2B10-3 Design Features 1 Base. Manufactured in stainless steel 304 or 316 type and designed according to the disc in order to keep the operating pressure and valve hermeticism. This component complies with the input diameter given by the Standard. 2 Disc. Manufactured in stainless steel 304 or 316 type, it ensures the operating pressure and hermeticism of the valve. Both, the disc and base, have a polished finish on their seal areas to guarantee valve hermeticism. 3 Upper adjusting ring. It regulates required shooting pressure of the valve (simmer) lower than 2% of the calibrating pressure. 4 Lower adjusting ring. It regulates required pressure to the close (blowdown) lower than 10% of the calibrating pressure. 5 Compression screw. Its purpose is to adjust the spring and calibrate the valve. Its spheric end stabilizes and keeps aligned the components which work under pressure in its construction axis. 6 Spring. The spring is made from carbon steel coated with cadmium or zinc. 7 Adjusting ring bolts. The adjusting ring bolts immobilize each ring. This guarantees that the valve might not present any change in calibration due to a vibration or hit during operation process. 8 Inlet. NPT inlet male threaded connection as per ASME/ANSI B Outlet. NPT outlet female threaded connection as per ASME/ ANSI B Spindle. 304 or 316 type, it is designed to achieve the alignment of internal parts and for the manual operation of the valve. 11 Lever. The lever is designed in one piece to make operation of the valve easier. It is designed for manual operation in service and to verify the valve performance, it is recommended to operate it with a pressure minimum of 75% of the adjusting/calibration pressure in order to avoid seal areas damage. 5 Compression screw 10 Spindle 11 Lever 6 Spring 3 Upper adjusting ring Disc 2 Adjusting ring bolts 7 Base 1 9 Female threaded connection Male threaded connection 8 4 Lower adjusting ring 13

14 WALWORTH BRONZE PRESSURE SAFETY VALVES ModelS 2B10 & 2B10-3 Design Features 15 Safety valves for steam, gas or air service Lateral discharge (to the line of service) NPT male threaded inlet for pipeline as per ASME/ANSI B NPT female threaded outlet for pipeline as per ASME/ANSI B Sizes in between ½ and 2 ½ Minimum set pressure: 5 PSIG (0.35 Kg/cm 2 ) Maximum operating pressure (steam): 2B10: 250 PSIG (17.58 Kg/cm 2 ) 2B10-3: 300 PSIG (21.10 Kg/cm 2 ) For air or gas service it has to be added at a pressure of 50 PSIG (3.52 Kg/cm 2 ). Maximum operating temperature: 2B10: 406 F (208 C) 2B10-3: 420 F (215 C) Regular Bill of Materials Ref. Description 2B10 2B10-3 (1) (2) 1 Base Naval Brass 304 Stainless Steel 2 Disc Naval Brass 304 Stainless Steel 3 Spindle Carbon Steel 304 Stainless Steel 4 Body Casted Bronze Casted Bronze 5 Lever Casted Bronze Casted Bronze 6 Cap Casted Bronze Casted Bronze 7 Lower Adjusting Ring Forged Brass Forged Brass 8 Upper Adjusting Ring Forged Brass Forged Brass 9 Lower Adjusting Bolt Brass Brass 10 Upper Adjusting Bolt Brass Brass 11 Compression Screw Brass Brass 12 Compression Screw Nut Brass Brass 13 Spring Washers Brass Brass 14 Spring Carbon Steel Carbon Steel 15 Lever Pin Commercial Commercial 16 Washer Commercial Commercial (1) Available with 316 stainless steel (spindle, disc and base). (2) Available with stainless steel spring. (3) Soft seal design

15 WALWORTH BRONZE PRESSURE SAFETY VALVES ModelS 2B10 & 2B10-3 Dimensions and Weights Size in mm 1/2 13 3/ / / /2 64 Units A B C D in mm in mm in mm in mm in mm in mm in mm 6 5/ / / / / / / / / / / / / / / / / / / / / / / / / / / Minimum mounting height 8 1/ / / / / / / Weight (approx.) 2.0 Lb 0.9 Kg 2.0 Lb 0.9 Kg 3.0 Lb 1.4 Kg 4.6 Lb 2.1 Kg 7.8 Lb 3.5 Kg 10.6 Lb 4.8 Kg 17.8 Lb 8.1 Kg A B C D Technical Information Model Nominal Diameter Orifice N.P.T. end Connection Area Inlet Oulet Designation in mm in 2 mm 2 (Male) (Female) Psig Maximum limit of pressure and temperature 2B10 (1) (2) 2B10-3 (1) (3) Kg/ cm 2 F C Psig Kg/cm 2 F C 2B10 DRL 1/ DRL 1/2" 3/4" B10 D 3/ D 3/4" 3/4" B10 E E 1" 1" B10 F 1 1/ F 1 1/4" 1 1/4" B10 G 1 1/ G 1 1/2" 1 1/2" B10 H H 2" 2" B10 J 2 1/2 64 1, J 2 1/2" 2 1/2" (1) Steam Service. (2) 21.1 Kg/cm 2 (300 Psig.) Air or gas service. (3) 24.1 Kg/cm 2 (350 Psig.) Air or gas service. 15

16 WALWORTH BRONZE PRESSURE SAFETY VALVES ASME, B & PVC, Section I Rating Edition for Models 2B10 & 2B10-3 Relief capacity in pounds per hour of saturated steam at 3% overpressure or 2 PSIG whichever is greater; 90% of actual capacity. Orifice designation & relief area - sq. In. Set pressure 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" DRL D E F G H J PSIG Kg/cm ,

17 WALWORTH BRONZE PRESSURE SAFETY VALVES ASME, B & PVC, Section I Rating Edition for Models 2B10 & 2B10-3 Relief capacity in pounds per hour saturated steam at 10% overpressure or 3 PSIG, whichever is greater; 100% of actual capacity. Orifice designation & relief area - sq. In. Set pressure 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" DRL D E F G H J PSIG Kg/cm ,

18 WALWORTH BRONZE PRESSURE SAFETY VALVES ASME, B & PVC, Section I Rating Edition for Models 2B10 & 2B10-3 Relief capacity in cubic feets per minute of air (15.6 C = 60 F) at 10% overpressure or 3 PSIG, whichever is greater. Orifice designation & relief area - sq. In. Set pressure 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" DRL D E F G H J PSIG Kg/cm ,

19 WALWORTH BRONZE PRESSURE SAFETY VALVES OVERPRESSURE FACTORS FOR AIR, STEAM OR GAS SERVICE VALVES 1.25 MULTIPLY THE CHART S CAPACITY BY THE FACTOR, TO OBTAIN THE OVERPRESSURE CAPACITY REQUIRED % OF OVERPRESSURE FOR HIGHER PRESSURES USE 400 PSIG BASE LINE TAKEN AT 3% OVERPRESSURE Correction factors for temperature given by the temperature for air and gas ADJuSTmENT pressure Correction factors of relative density given by the specific gravity for air and gas F C Factor F C Factor F C Factor (1) SG = Specific gravity SG Factor SG(1) Factor SG Factor

20 WALWORTH BRONZE PRESSURE SAFETY VALVES PIPE CAPACITY The tight control of fluid handling is as important as correctly calculating the size of a safety valve. This size should be determined based on work performed and not by the size of the existing pipe. When the quantity of fluid that passes through a valve is not known, the maximum size of the valve can be determined by the capacity of the piping into the valve outlet. Note: The capacity tables shown are a guide to select the size of the valves. However, there are several factors involved in the flow of fluids, which may affect the capacity of valves and pipes. It is impossible to get a table that takes into consideration all previous variants; however, the use of the accompanying tables provides capabilities very close to reality. Note: Do not connect a line valve before or after a safety valve. Pounds per hour saturated steam Length of pipe equivalent to 240 diameters - Pressure drop 2 PSIG Set pressure Pipe diameter in inches PSIG Kg/cm 2 1/2 3/ /4 1 1/ / ,423 2,378 4,352 10, ,072 1,580 2,641 4,832 12, ,168 1,720 2,875 5,262 13, ,256 1,850 3,091 5,655 14, ,336 1,968 3,290 6,020 14, ,412 2,081 3,478 6,364 15, ,552 2,286 3,820 6,991 17, ,678 2,472 4,132 7,560 18, ,022 1,796 2,645 4,422 8,090 20, ,084 1,906 2,806 4,691 8,586 21, ,143 2,008 2,958 4,943 9,044 22, ,205 2,104 3,097 5,175 9,510 23, ,256 2,189 3,232 5,396 9,900 24, ,376 2,414 3,545 5,939 10,626 26, ,001 1,425 2,492 3,669 6,117 11,241 28,800 Pipes capacities in cubic feets per air minute Length of pipe equivalent to 100 feet - Pressure drop 2 PSIG Set pressure Pipe diameter in inches PSIG Kg/cm 2 1/2 3/ /4 1 1/ /

21 WALWORTH BRONZE PRESSURE SAFETY VALVES APPLICATION AND SELECTION VALVE 2B10 & 2B10-3 Application The most usual applications for WALWORTH safety valves are to relieve excess pressure in piping system and equipment, such as: Boilers Autoclave Compressors Steam generators Air pressure vessels Tankers carrying gas Air services or non-corrosive gas bronze Selection The proper selection of a safety valve depends greatly on the service for which it is designed, such as: Fluid handling Discharge type Pressure adjustment Operating temperature Required discharge capacity Selection Example (find which valve must be chosen to protect the piping system) It needs to protect a vessel containing air under pressure, with the following characteristics: Size (as per customer request) Fluid handling: air Discharge type: lateral (to the pipeline) Pressure adjustment: 10.5 Kg/cm 2 (150 Lb/in 2 ) Operating temperature: 15.6ºC (60ºF) Required discharge capacity: 450 ft 3 /min Solution For the flow to handle discharge rate and pressure and temperature limits, we realize we need a valve 2B10(consult page 11). Now, to calculate the size of the valve we use the discharge capacity and pressure adjustment required, as follows: 1. In the table on page 18, find in the left column the required adjustment pressure 10.5 Kg/cm 2 (150 Lb/in 2 ) and in that row find the immediate superior capacity required (450 ft 3 /min). In our case the immediately superior is 619 ft 3 /min, which corresponds to the column of hole E (0.196 in 2 ). 2. In the table of Technical Information for valve 2B10, we can see that a hole E (0.196 in 2 ) corresponds to a nominal size of 25 mm. (1 ). Therefore, we must select a valve 2B10 of 1. NOTE: For temperatures different to 15.6 ºC (60 ºF) and/or different overpressures than indicated in the tables, consult graphs and tables on page 19. Required information for valve selection (example). Size Model Pressure Adjustment Fluid Handling* Overpressure* Temperature* 25mm (1 ) 2B10-E 10.5 Kg/cm 2 (150 PSIG) Air 10% 15.6 ºC (60 ºF) * To ensure the proper functioning of the valve, the Customer is required to provide the correct data; if not, WALWORTH shall consider the following features as standard. 1. Fluid: Air 2. Overpressure: 10% 3. Temperature: 15.6 ºC (60 ºF) 21

22 WALWORTH BRONZE RELIEF VALVES MODEL 2B20 & 2B20-3 Design Features Relief valves for liquid service Lateral discharge (to the line of service) NPT male threaded inlet as per ASME/ANSI B NPT female threaded outlet as per ASME/ANSI B Sizes in between ½ and 3 Minimum set pressure: 5 PSIG (0.35 Kg/cm 2 ) Maximum operating pressure (except 3 ): 300 PSIG (21.10 Kg/cm 2 ); for PSIG (10.55 Kg/cm 2 ) Maximum operating temperature: 208 C (406 F) Regular Bill of Materials Ref. Description 2B20 2B20-3 (1) (2) 1 Base Naval Brass 2 Disc Naval Brass 3 Spindle Carbon Steel 304 Stainless Steel 304 Stainless Steel 304 Stainless Steel 4 Body Casted Bronze Casted Bronze 5 Cap Casted Bronze Casted Bronze 6 Compression Screw Brass Brass 7 Compression Screw Nut Brass Brass 8 Spring Washers Brass Brass 9 Spring Carbon Steel Carbon Steel (1) Available with 316 stainless steel (spindle, disc and base). (2) Available with stainless steel spring Technical Information Model Nominal diameter N.P.T. conections Maximum temperature pressure limits 2B20 Inlet Outlet pulg mm (male) (female) PSIG Kg/cm 2 F C 2B20 1/2 13 1/2" 3/4" B20 3/4 19 3/4" 3/4" B " 1" B20 1 1/ /4" 1 1/4" B20 1 1/ /2" 1 1/2" B " 2" B20 2 1/ /2" 2 1/2" B Note: in models 2B20 and 2B20-3 the trim adjustments apply the same as per models 2B10 y 2B10-3. For these models please refer to page

23 WALWORTH BRONZE RELIEF VALVES MODEL 2B20 & 2B20-3 Design Features 1 Base. Designed according to the disc in order to ensure the operating pressure and valve hermeticism. 2 Disc. Ensures the operating pressure and hermeticism of the valve. Both, disc and base have a polished finish on their seal areas to guarantee valve hermeticism. 3 Compression screw. Its purpose is to adjust the spring and calibrate the valve. Its spheric end stabilizes and ensures alignment of components which work under pressure in their construction axis. 4 Spring. The spring is made from carbon steel coated with cadmium or zinc. 5 Inlet. NPT male threaded inlet connection as per ASME/ANSI B Outlet. NPT female threaded outlet connection as per ASME/ ANSI B Spindle. It is designed to achieve the alignment of internal parts and for the manual operation of the valve. Its spheric end keeps the disc aligned over its construction axis in order to maintain the valve hermeticism. 3 Compression Screw 4 Spring 7 Spindle 6 NPT outlet 2 Disc 1 Base 5 NPT inlet Size and Weights B C D A Size pulg mm 1/2 13 3/ / / / Units A B C D Minimum mounting height Weight (aprox.) pulg 5 9/16 2 3/8 1 5/ /16 6 7/8 1.3 Lb mm Kg pulg 5 9/16 2 3/8 1 5/ /16 6 7/8 1.3 Lb mm Kg pulg 6 9/ /16 1 5/8 2 1/8 8 1/8 2.3 Lb mm Kg pulg 7 9/ / /16 9 1/4 3.5 Lb mm Kg pulg 8 5/16 3 5/16 2 1/8 2 7/8 10 1/4 4.5 Lb mm Kg pulg 10 1/2 3 7/8 2 11/ / /4 9.5 Lb mm Kg pulg 12 3/8 4 5/8 3 1/8 4 13/ / Lb mm Kg pulg 12 11/16 6 1/16 3 1/2 5 3/ Lb mm Kg 23

24 WALWORTH BRONZE RELIEF VALVES ASME, B & PVC, Section VIII rating 2008 Edition FOR MODELS 2B20 & 2B20-3 Relief capacity in gallons of water per minute at 25% overpressure Set Pressure Size PSIG Kg/cm 2 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3"

25 WALWORTH BRONZE RELIEF VALVES PIPE CAPACITY 2B20 &2B20-3 The tight control of fluid handling is as important as correctly calculating the size of a safety valve. This size should be determined based on work performed and not by the size of the existing pipe. When the quantity of fluid that passes through a valve is not known,the maximum size of the valve can be determined by the capacity of the piping into the valve outlet. Note: The capacity tables shown are a guide for selecting the size of the valves. However, there are several factors involved in the flow of fluids, which may affect the capacity of valves and pipes. It is impossible to get a table that takes into consideration all previous variants; however, the use of the accompanying tables provides capabilities very close to reality. Pipe capacities in gallons of water per minute based on maximum recommended speed Piping size Gallons per Piping size in mm minute mm in Gallons per minute 1/ / / / / Overpressure factors for liquids service relief valves 1.0 MULTIPLY THE CHART S CAPACITY ON 25% BY THE FACTOR TO OBTAIN THE OVERPRESSURE CAPACITY REQUIRED Application 6% 10% 15% 20% 25% PERMISSIBLE OVERPRESSURE WALWORTH relief valves are designed to protect equipment and processes against excess fluid pressure. The most usual applications are in tanks, pipelines and other containers where high capacity of relief is not required. These valves should be used in a non-corrosive liquid service bronze. Selection The proper selection of a safety valve depends greatly on the service for which it is designed, such as: Fluid handling Pressure adjustment Operating temperature. Required discharge capacity. 25

26 WALWORTH BRONZE RELIEF VALVES APPLICATION AND SELECTION VALVE 2B20 & 2B20-3 Selection Example (find the valve model we most often use to protect the system) It needs to protect a vessel containing air under pressure and have the following characteristics: Fluid handling: water Pressure adjustment: 8.79 Kg/cm 2 (125 lb/in 2 ) Solution Operating temperature: 15.6ºc (60ºf) Required discharge capacity: 75 gal/min Overpressure: 25% For the flow to handle pressure and temperature limits, we realize we need a valve 2B20. To calculate the size of the valve we use the discharge capacity and pressure adjustment required, as follows: In the table on page 24, find in the left column the required adjustment pressure: 8.79 Kg/cm 2 (125 Lb/in 2 ); and in that row find the required capacity (75 gal/min) and select the immediate superior which in our case is 103 gal/min, corresponding to the column of the valve 1 ½. Therefore, we must select a valve 2B20 of 1 1/2. NOTE: To get capacities with overpressures different to 25%, view page 25. Required information to select the proper valve (example) Size Model Pressure adjustment Fluid handling* Overpressure* Temperature* 38mm (1 1/2 ) 2B Kg/cm 2 (125 PSIG) Water 25% 15.6 ºC (60 ºF) * To ensure the proper functioning of the valve, the Customer is required to provide the correct data; if not, WALWORTH shall consider the following features as standard. 1. Fluid: Water 2. Overpressure: 25% 3. Temperature: 15.6 ºC (60 ºF) STEAM TESTING LABORATORY Testing equipment WALWORTH safety and relief bronze and steel valves are tested according to ASME Standard sections I and VIII which regulate boilers and pressure vessels building. In WALWORTH, we are committed to our clients equipment, facilities and personnel safety, for this reason, we have implemented a steam testing laboratory in order to guarantee our safety and relief valves performance for steam service. 26

27 WALWORTH BRONZE RELIEF VALVES TEMPERATURE CONVERSION TABLE (-)273 to 22 ºC 27 to 322 ºC 327 to 622 ºC 627 to 922 ºC 927 to 1222 ºC º C º F º C º F º C º F º C º F º C º F

28 DESIGN BASIS All of WALWORTH s Valve Designs, when applicable, follow one or more of the following standards: API Standards ANSI Standards MSS Standards ASME Code American Petroleum Institute: API 520 Sizing, Installation of Pressure-Relieving Devices in Refineries. Part I and II API 521 Guide for Pressure-relieving and Depressurizing Systems API 527 Seat Tightness of Pressure Relief Valves National Standards Institute: B 1.1 Unified Inch Screw Threads B Pipe Threads, General Purpose (Inch) Manufacturer s Standardization Society: MSS SP-25 Standard marking system for valves, fittings, flanges and unions MSS SP-55 Quality standard for steel castings for valves, flanges and fittings and other piping components - visual method for evaluation of surface irregularities American Society of Mechanical Engineers: SECTION I Rules for Construction of Power Boilers SECTION II Materials-Part A-Ferrous Material Specifications SECTION II Materials-Part B-Nonferrous Material Specifications SECTION V Nondestructive Examination SECTION VIII Rules for Construction of Pressure Vessels Division 1 and 2 ASTM Standards American Society for Testing and Materials: ASTM A 276 Standard Specification for stainless and heat-resisting steel bars and shapes B62 Standard Specification for Composition Bronze or Ounce Metal Castings B283 Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed) B21 Standard Specification for Naval Brass Rod, Bar, and Shapes 28

29 HOW TO ORDER WALWORTH valves are designed using catalog figure numbers which describe their main characteristics. The valve identification system shown here is intended to assist our Customers in specifying the valve required and to avoid mistakes during manufacturing. 1-2B A-10 OVERPRESSURE % FLUID HANDLING ADJUSTMENT PRESSURE (Kg/cm 2 ) MODEL (TYPE OF VALVE) SIZE OF THE VALVE IN INCHES 2B10 & 2B10-3 Models Size Model Pressure adjustment Fluid handling* Overpressure* Temperature* 25mm (1 ) 2B Kg/cm 2 (150 PSIG) Air 10% 15.6 ºC (60 ºF) Size Model Pressure adjustment Fluid handling Overpressure Temperature 1/2 3/ /4 1 1/ /2 2B10 2B10-3 Using Customer s specifications, consult adjustment pressure table depending on fluid service, shown in pages 16 to 18. Steam= S Gas= G Note: Different overpressures from standard are available according to Customer s requirement. Air= A 10% Per customer s requirements. 2B20 & 2B20-3 Models Size Model Pressure adjustment Fluid handling* Overpressure* Temperature* 38mm (1 1/2 ) 2B Kg/cm 2 (125 PSIG) Water 25% 15.6 ºC (60 ºF) Size Model Pressure adjustment Fluid handling Overpressure Temperature 1/2 3/ /4 1 1/ /2 3 2B20 2B20-3 Per Customer s requirements. Per Customer s requirements consult adjustment pressure table depending on fluid service, shown in pages 24 to 25. Water= W Non corrosive Bronze fluids= NCB Note: Different overpressures from standard are available according to Customer s requirement. 25% Per Customer s requirements. 29

30 THE WALWORTH COMPANY GENERAL TERMS AND CONDITIONS ACCEPTANCE: All quotations are for acceptance within 30 days from date of quotation unless extended in writing. In the event a purchase order is placed after this period of time, the WALWORTH Company reserves the right to requote base prices of all valves offered. All orders and contracts are subject to credit approval and acceptance by the WALWORTH Company. FREIGHT: When prices are f.o.b. point of shipment - no freight allowance - we will attempt to route shipments in the method which will result in the lowest cost unless otherwise instructed. All shipments will be freight charges collect except when stipulated on the purchase order, in which case you will be invoiced for all transportation charges. Delivery of material to a common carrier shall be considered to be delivery to Buyer and shall be at Buyer s risk thereafter. Claims of loss of or damage to material in transit shall be filed by the Buyer directly with the carrier. PRICES: There will be added to all prices quoted sales, use, occupation or any other excise or similar tax which Seller may be required to pay or collect on or in connection with the sale. Seller shall be established by Federal, State or other government regulation with respect to the product(s) topped by the order which shall be lower than the price(s) specified in the order. ESCALATION TERMS: Prices shown in this price schedule reflect the costs in effect at the time of publication. These prices will remain firm on all products with a quoted delivery of twenty six (26) weeks or less. On products which have a scheduled delivery of more than twenty-six (26) weeks, the goods will be invoiced based on the applicable price sheet in effect at the time of shipment. In no event will the invoiced price be less than the price originally quoted. PURCHASED COMPONENTS: (i.e. motors, gearing, etc.) Prices are quoted on the supplier s price in effect at the time of quotation. Actual invoice price will be adjusted in accordance with the supplier s escalation policy. DIFFERED SHIPMENTS: If for any reason the customer desires to delay shipments more than 30 days after manufacturing is complete, or to place a on hold or stop to the order during the manufacturing cycle, The WALWORTH Company reserves the right to consider the order cancelled and to invoke cancellation charges per the schedule bellow. CANCELLATION: After order acceptance by WALWORTH, items or completed orders may be cancelled and Buyer will be charged for work performed, based on the following schedule: - Five percent (5%) of prices of stock items. - Ten percent (10%) of price of stock items ordered in quantities which exceed normal inventory levels. - Five percent (5%) of prices prior to drawing submittal on made-to-order items. - 15% after drawing approval, but prior to the start of castings. - 30% to 50% during casting cycle, depending on the state of completion. - 55% to 75% during machining and assembly operations, depending on the state of completion. -100% after final assembly and test. REMITTANCES: Remittances must be made to the address indicated on the invoice. CREDIT TERMS: As quoted. Invoices on balances overdue will be subject to a service charge of 1 1/2 % per month on such indebtedness. DELIVERIES: Shipments and deliveries shall at all times be subject to the approval of Seller s Credit Department. If the Buyer shall fail to make any payments according to the terms of the contract, Seller may, in addition to and not in limitation of its other rights and remedies, at its option, cancel all or any part of Buyer s incomplete contracts with Seller, or may defer shipments of deliveries under Buyer s contracts with Seller except upon receipt of satisfactory security or for cash shipment. All schedule of shipments are estimated as closely as possible and Seller will use its best efforts to ship within the time scheduled, but does not guarantee to do so. Schedules commence with the date Seller receives authorization to proceed with the order, subject to the provisions of the next sentence. The order will not be released for manufacture until complete specifications and approved drawings (if drawing approval is required) are received at the plant of manufacturer and the estimated schedule of shipment will commence with the date of such receipt. Seller shall not be liable for any direct, indirect or consequential damage or loss caused by any delay in delivery, regardless of the cause of delay. Without limiting the generality of the foregoing, Seller assumes no responsibility for delays in delivery resulting from fire, flood, accidents, riots, strikes, transportation delays, labor or material shortages, existing or future laws, acts of any governmental authority, or any other cause beyond Seller s control. Items offered from stock are subject to prior sale. INSPECTION: Final inspection and acceptance of products must be made at the plant of manufacture, unless otherwise provided in the order and/ or in agreed upon specifications. Prices do not include charges for special tests or inspections performed at the request of the Buyer, unless called for in the order and/or in agreed upon specifications. RETURNS: Permission in writing and return tagging instructions must be obtained from Seller before any goods returned for credit or adjustment will be accepted. Where returned goods are accepted, a minimum charge of 25% of the invoice price will be made, plus freight from both directions and costs of reconditioning the material for resale as new. WARRANTY: Seller will replace without charge or refund the purchase price of products manufactured by Seller which prove to be defective in the material or workmanship, provided in each case that the product is properly installed and is used in the service for which Seller recommends it and that a written claim, specifying the alleged defect, is presented to Seller. Seller shall in no event be responsible for (a) claims for labor, expenses or other damages occasioned by defective products or (b) for consequences or secondary damages. THE WARRANTY STATED IN THIS PARAGRAPH IS IN LIEU OF ALL OTHER WARRANTIES, EITHER EXPRESSED OR IMPLIED. WITH RESPECT TO WARRANTIES, THIS PARAGRAPH STATES BUYER S EXCLUSIVE REMEDY AND SELLER S EXCLUSIVE LIABILITY. DESIGN, ETC: Seller reserves the right to change design, materials or specifications without notice. There will be a charge for modifying an order after it has been entered when such change or modification results in additional engineering or clerical work for either The WALWORTH Company or our suppliers. MINIMUM CHARGE: Orders totaling less than $ net will be billed at a minimum charge of $ Repair parts will be billed at a minimum charge of $ NOTE: We reserve the right to correct obvious clerical errors in quotations, invoices, and other contracts. 30

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32 MÉXICO Industrial de Válvulas, S.A. de C.V. Av. de la Industria Lote 16 Fracc. Industrial El Trébol, C.P Tepotzotlán, Estado de México Phone: (52 55) Fax: (52 55) USA/CAN Authorized Distributor TWC The Valve Company Dublin Court, Stafford, Texas Phone: (281) Fax: (281) SAFETY AND RELIEF BRONZE VALVES 2011 EDITION VERSION 1