World Area Differences Technical Information

Transcription

1 World Area Differences Technical Information DMISC2047X02 This document is to give more information about the following: Porting & Threads Cleaning Procedures Conversion Tables PORTING & THREADS NPT (National Pipe Thread) and NPTF (National Pipe Thread Dry-seal) General: The NPT port is the most common pressure connection in the U.S. It is a threaded connection sealed by the squeezing action of the tapered threads on a sealant such as Teflon tape applied to one of the threads. Pressure Capability: TESCOM allows these ports to be used in regulators intended for pressures up to the piping ratings. The standard ports in TESCOM regulators and valves are machined to NPTF. This is a higher quality sealing thread than a standard NPT port because of the tight fit of the crest and root diameters of the thread. Advantages: Mating parts are readily available in the widest variety of materials and configurations. The port itself may be machined in any metal suitable for regulator bodies. No elastomeric is required to affect the seal so the connection can be made entirely from Teflon and the regulator body material. Limitations: The quality of seal formed is somewhat dependent on the skill of the operator in applying sealant and torque. The sealant can contaminate a system, especially if the joint is disconnected and then reconnected. The assembled dimension of the joint may vary because of the variability in machining and the variability of assembly torque. SAE (Straight Thread O-ring Boss Seal) General: The SAE port utilizes a threaded connector sealed with an elastomeric o-ring. The o-rings used are from the ARP-900 Series and may be specified in an available elastomeric material to match the characteristics of the media. Pressure Capability: TESCOM allows these ports to be used in regulators intended for pressures up to the piping ratings. Advantages: Excellent seal for both liquids and gases that does not require any additional sealant which could contaminate a system. Very easy to make and break; very good reusability. Assembled dimensions are constant and predictable. Limitations: Cost and pressure capability is not as good as NPT. Rotational alignment to mated fittings and components cannot be controlled without the use of special fittings. MS33649 General: The MS33649 port is an aerospace connection. It utilizes a threaded connector sealed with an elastomeric o-ring. The o-rings used are from the ARP- 900 Series and may be specified in any available elastomeric material to match the characteristics of the media. This port in not recommended for new application use - SAE ports are recommended. Pressure Capability: TESCOM allows these ports to be used in regulators intended for pressures up to the piping ratings. Advantages: Excellent seal for both liquids and gases that does not require any additional sealant which could contaminate a system. Very easy to make and break; very good reusability. Assembled dimensions are constant and predictable. TESCOM recommends the use of SAE ports.

2 High Pressure (AMINCO ) Limitations: High cost and very difficult to find fittings. General: The High Pressure port is a coned connection designed for very high pressure service. The seal is formed by the coned end of the thick walled tubing being forced into a metal-to-metal seal with the regulator body. Available in tube outside diameter sizes of /4 inch (6.35 mm), 3/8 inch (9.53 mm) and 9/6 inch (4.27 mm) and bore sizes of inch (2. mm), 0.25 inch (3.8 mm), 0.88 inch (4.78 mm) and inch (6.35 mm). Pressure Capability: High Pressure ports connected to the correctly mated fitting and tubing will work at pressure up to,000 psig / 437 bar with the correct pressure rated piping. Advantages: The High Pressure port is very reliable at extreme pressures under rigorous thermal and pressure cycling. It provides ease of assembly, disassembly and sealing without the use of additional sealants, which could contaminate a system. Uncompromised reliability under rigorous thermal and pressure cycling. Well suited to installations which require repeated assembly and disassembly with consistent reliability. Limitations: The flow area of the high pressure tubing used with High Pressure ports is very small and the tubing is difficult to bend. The tubing must be specially machined to mate with the port. The range of the internal bore of pipes is from inch (2. mm) up to 0.25 inch (6.35 mm). Medium Pressure (Autoclave, Slim-Line ) General: Medium Pressure ports are intended to mate with the medium pressure fittings. This medium-high pressure fitting seals in the same way as the high pressure fitting. Design is a more compact version of the original Autoclave Engineers High Pressure connections. Available in tube outside diameter sizes of /4 inch (6.35 mm) through -/2 inch (38.0 mm) and bore sizes from 0.09 inch (2.77 mm) to inch (23.83 mm). Pressure Capability: Medium Pressure ports connected to the correctly mated fitting and tubing will work at pressures up to 20,000 psig / 379 bar with the correct pressure rated piping. Advantages: The Medium Pressure port is very reliable at medium pressures under rigorous thermal and pressure cycling. It provides ease of assembly, disassembly and sealing without the use of additional sealants, which could contaminate a system. Valve or Fitting Body Line-contract Sealing Valve or Fitting Body Line-contract Sealing Positive Backup Support Collar Gland Cold-worked Tubing Differences in angles exaggerated for clarity. Positive Backup Support Cold-worked Tubing Limitations: The flow area of the medium pressure tubing used with Medium Pressure ports is greater than in the High Pressure design. The tubing is difficult to bend and has to be specially machined to mate with the port. The range of the internal bore of pipes is from 0.09 inch (2.77 mm) up to inch (23.83 mm). Collar Gland Differences in angles exaggerated for clarity. 2

3 HPIC (High Purity Internal Connection) General: A special internal high purity metal-to-metal gasket connection. The tightness results by pressing the gasket between two sealing lips. This design is compatible to VCR fittings. Pressure Capability: Pressure rating depends on port size and material. For Stainless Steel (standard material), the maximum pressure for /8" is 8500 psig / 585 bar and for /2" is 3500 psig / 24 bar. Advantages: This connection has a high grade of cleanliness and is free of particles due to no gas wetted threads. The tightness rate is up to x0-9 mbar l/s Helium. Limitations: Functionality depends on the surface roughness of the sealing lip. Costs are high due to opposite to flat sealing designs and requirements for high purity applications. Maximum HPIC port size is /2". Tooling for porting is needed. BSP (British Straight Pipe) General: The British Standard Pipe thread (BSP thread) is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread. Commonly used are BSPP (British Standard Pipe Parallel) threads, which are straight (parallel) threads. They are used where the seal is obtained with a sealing ring. The new/ official name of the BSP parallel thread is ISO 228/ (G-Thread). Application for gases of standard purity. Metal gaskets, metal gaskets with elastomeric lip and fittings with o-rings can be used. Pressure Capability: TESCOM allows these ports to be used in device intended for pressures up to the fitting and piping ratings. Advantages: The BSP port is reliable and provides ease of assembly and disassembly with metal gaskets, metal gaskets having an elastomeric lip or fittings with o-ring. Limitations: Contamination of gas is possible when using gaskets with elastomeric components (diffusion). Particles originating from threads during assembly could contaminate the gas wetted area. Pipe Thread according to ISO228- (G-Thread) General: The Pipe thread according to ISO228 (G-Thread) is one of the most commonly used straight threads worldwide. This thread is in metric dimension equivalent to the BSP thread. It is used in applications for gases of specific purity in the laboratory market. Sealing line is the flat bottom of the core bore and a metal gasket has to be used. With flat sinking at the top like BSP port, a metal-to-metal sealing is possible with fittings having a sealing lip contour. With flat sinking BSP fittings used in combination with metal gaskets, metal gaskets with elastomeric lip and o-rings could be used. Pressure Capability: TESCOM allows these ports to be used in devices intended for pressures up to the fitting and piping ratings. Advantages: Metal-to-metal sealing avoids contamination of the system, also called no diffusion. The tightness rate is up to x0-6 mbar l/s Helium. Sealing on the bottom face avoids particles in the gas wetted area. Limitations: Functionality depends on quality of sealing surface and gasket. Disassembly of the deformed metal gasket (like copper) is difficult and bottom sealing surface could be damaged. If there is a leakage, retightening with higher torque will not be successful in all cases. Stainless Steel versions need silver plated stainless steel washers to avoid burrs during assembly. 3

4 Metric ISO Thread according DIN 3 General: A commonly used straight metric thread used for connection between a regulator body and cylinder bolt to connect to a gas cylinder. Application is for gases of standard and specific purity of gases up to 6.0. Pressure Capability: Pressure ratings depend on material and design of sealing components. Advantages: Metal-to-metal sealing is up to 300 bar by tightness rate up to x0-6 mbar l/s Helium. Sealing on the bottom face avoids particles in the gas area. Limitations: Functionality depends on quality of sealing surface. If there is a leakage, retightening with higher torque will not be successful and rework of the bolt or housing will be needed. CLEANING PROCEDURES Ultra High Purity Cleaning 36L VAR per SEMI F20 Electropolished and Cleaned per SEMI F9 for precise control of Surface Roughness, Defects, Contamination, Chemistry, and Corrosion Resistance. Oxygen Cleaning (Removal of particles and oils) According to DIN EN ISO 500 for medical products and products for oxygen applications in the European market. According to CGA E4. and ASTM G93. Note: Oxygen cleaning does not mean the product is compatible for oxygen service. Products designed for oxygen service should use oxygen compatible materials in addition to being cleaned for oxygen. Certificate of Conformance is available upon request at time of ordering. 4

5 CONVERSION TABLES Flow Volume l /s l /min gal /min feet 3 /s feet 3 /min l /s l /min gal /min feet 3 /s feet 3 /min Mass Flow Rate g/s g/min g/hr kg/s kg/min kg/hr lb/s lb/min lb/hr g/s g/min g/hr kg/s kg/min kg/hr lb/s lb/min lb/hr , , ,0, ,632,933 27, x x Volume mm 3 cm 3 liter m 3 inch 3 feet 3 gal mm 3 cm 3 liter m 3 inch 3 feet 3 gal 000 x 0 6 x x x x x x 0-9 x x x x x x x x Length mm cm m km inch feet mile mm cm m km inch feet mile x x x x x x x x x x x x x x 0-4 5

6 CONVERSION TABLES (continued) Temperature C = [ F - 32] x 5 / 9 F = [ C x 9 / 5] + 32 Surface Finishes R a μm μm μinch μinch Common Surface Finishes 0.26 μm = 0 μinch 0.38 μm = 5 μinch 0.80 μm = 32 μinch.6 μm = 63 μinch 2.5 μm = 00 μinch Pressure hpa (mbar) inch Hg inch H 2O feet H 2O bar psi (lb/in 2 ) kg/cm 2 MPa hpa (mbar) inch Hg inch H 2O feet H 2O bar psi (lb/in 2 ) kg/cm 2 MPa , WARNING! Do not attempt to select, install, use or maintain this product until you have read and fully understood the TESCOM Safety, Installation and Operation Precautions. DMISC2047X Emerson Process Management Regulator Technologies, Inc. All rights reserved. 05/202. Tescom, Emerson Process Management, and the Emerson Process Management design are marks of one of the Emerson Process Management group of companies. All other marks are the property of their respective owners. 6