SV60 Safety valves for use with steam, gas and liquids
Spirax Sarco safety valves - protecting people, plant and profit The SV60 spring loaded full lift safety valve range from Spirax Sarco has been designed to protect against excess pressure across a broad spectrum of industrial processes. Suitable for use with steam, gas and liquids, the SV60 safety valves provide a comprehensive and competitive solution to most applications, including the protection of steam boilers, pipeline and pressure vessels, compressors and receivers and most general industrial service applications. The safety valves are simple in design and available with inlet sizes of DN20 to DN150, and are suitable for set pressures up to 40 bar. people A company's most valued asset is secure in the knowledge that their safety has been put first Protecting plant Safeguard plant against major damage from excess pressure and ensure continued efficient operation profit Major shutdowns interfere with production and lose customers. A continuous supply of products protects a company's image and profits Quality comes as standard Safety valves protect people, plant and profit so there should be no compromise on quality when selecting a valve. The SV60 range of safety valves from Spirax Sarco meet the exacting standards laid down by AD-Merkblatt A2 and TRD 421, and their performance has been witnessed and approved by the TÜV. The quality of shut-off tightness is a critical feature of any safety valve and each Spirax Sarco safety valve is tested to enure that the integrity of shut-off complies with the requirements of the American Petrochemical Institute standard API 527. Spirax Sarco is a company of assessed capability to BS EN ISO 9001 Off-the-shelf availability. Compact high flow design. User benefits Wide range with a choice of body materials, bonnets and lever or cap arrangements to meet most application needs. Independently approved performance. API 527 shut-off tightness. Spirax Sarco s guarantee of worldwide technical support, knowledge and service. 2
Optional Optional Tamper-proof sealed cap. Easing lever with packing for zero environmental emissions. Chrome vanadium steel spring gives stability at high temperatures and eliminates spring relaxation. Open or closed bonnet options. Hardened stainless steel disc and seat, lapped to optical flatness. ç Choice of flange styles. ç 3
Sizing a valve Establish the maximum flowrate This value must be the maximum possible for the system, for example at full boiler load or maximum possible valve capacity. Establish the set pressure The set pressure must be low enough to ensure that the maximum allowable accumulated pressure of the boiler, vessel or system it is protecting, is not exceeded. The set pressure must be high enough to ensure that there is sufficient margin above the normal system operating pressure to allow the valve to close. However, it must be no higher than the maximum allowable working pressure of the system. For safety valves used downstream of pressure reducing valves, it is essential to establish the pressure at no load since this may be significantly higher than the working pressure for a direct acting type valve. Unless operational considerations dictate otherwise, the safety valve set pressure should always be significantly higher than the system operating pressure with plenty of margin allowed for blowdown. There is sometimes a temptation to set a safety valve just above the normal operating pressure, which can lead to poor shut-off and nuisance operation. Select a suitable size safety valve Once the type of safety valve has been selected and the flow and set pressures established, the correct size can be determined. For media such as steam, air and water, published capacity charts are usually quite sufficient to select the correct size safety valve. That is one, whose capacity just exceeds the required capacity at the desired overpressure. Where sizing charts are not available or do not cater for the particular fluid or conditions then the minimum required flow area will need to be calculated and a valve with a larger flow area chosen. For hot water duty where flashing will occur, the capacity charts for water are unsuitable since a percentage of the discharge will be steam and this must be taken into account in the sizing calculation. Typical application Protecting boilers Steam boilers have very specific requirements for safety valve performance. The safety valve is required to ensure overpressure cannot occur in the boiler. 4
Capacities SV60 flow capacity for steam kg/h (calculated in accordance with AD-Merkblatt A2 and TRD 421) Valve size DN 20 /32 25/ 40 32 /50 40/65 50/80 65 /100 80/125 100 /150 125 /200 150 /250 Orifice (mm) 17.1 23.8 30.7 38.1 50.2 59.0 73.0 91.0 105 125 Area (mm²) 230 445 740 1 140 1 979 2 734 4 185 6 504 8 659 12 272 a w (P > 4 bar) 0.78 0.86 0.76 0.68 0.64 0.71 0.66 0.70 0.72 0.73 Set pressure (bar g) Flow capacity for steam kg/h 1 180 381 577 772 1 251 1 919 2 683 4 373 6 043 8 703 2 296 630 952 1 303 2 089 3 194 4 514 7 334 10 130 14 551 3 406 862 1 289 1 782 2 859 4 381 6 249 10 133 14 028 20 184 4 510 1 090 1 603 2 209 3 610 5 531 7 872 12 973 17 766 25 528 5 613 1 309 1 925 2 652 4 333 6 641 9 450 15 575 21 329 30 647 6 713 1 522 2 239 3 085 5 040 7 724 10 992 18 116 24 807 35 646 7 812 1 734 2 549 3 513 5 740 8 796 12 517 20 630 28 250 40 593 8 914 1 953 2 871 3 957 6 466 9 908 14 100 23 238 31 822 45 725 9 1 012 2 161 3 177 4 378 7 154 10 963 15 601 25 712 35 210 50 594 10 1 114 2 379 3 498 4 820 7 876 12 069 17 175 28 307 38 764 55 700 12 1 311 2 800 4 118 5 675 9 272 14 208 20 219 33 324 45 634 65 572 14 1 510 3 226 4 744 6 537 10 681 16 367 23 292 38 388 52 568 75 537 16 1 709 3 649 5 366 7 395 12 082 18 515 26 349 43 426 59 467 85 450 18 1 911 4 081 6 001 8 269 13 512 20 705 29 465 48 562 66 501-20 2 102 4 490 6 602 9 097 14 864 22 778 32 415 53 425 73 160-22 2 303 4 919 7 233 9 968 16 286 24 957 35 516 58 535 - - 24 2 504 5 349 7 865 10 838 17 708 27 136 38 617 63 645 - - 26 2 705 5 778 8 496 11 708 19 130 29 315 41 717 - - - 28 2 906 6 207 9 127 12 578 20 552 31 494 44 818 - - - 30 3 107 6 637 9 759 13 448 21 974 33 672 47 918 - - - 32 3 308 7 066 10 390 14 319 23 395 35 851 51 019 - - - SV60 flow capacity for air m 3 /h at 0 C and 1013 mbar (calculated in accordance with AD-Merkblatt A2 and TRD 421) Valve size DN 20 /32 25/ 40 32 /50 40/65 50/80 65 /100 80/125 100 /150 125 /200 150 /250 Orifice (mm) 17.1 23.8 30.7 38.1 50.2 59.0 73.0 91.0 105 125 Area (mm²) 230 445 740 1 140 1 979 2 734 4 185 6 504 8 659 12 272 a w (P > 4 bar) 0.78 0.86 0.76 0.68 0.64 0.71 0.66 0.70 0.72 0.73 Set pressure (bar g) Flow capacity for air m³/h 1 227 480 728 973 1 578 2 419 3 383 5 514 7 621 10 975 2 377 802 1 211 1 657 2 657 4 062 5 742 9 328 12 885 18 509 3 522 1 107 1 656 2 289 3 672 5 627 8 026 13 015 18 018 25 924 4 660 1 411 2 074 2 858 4 670 7 157 10 184 16 785 22 986 33 029 5 795 1 697 2 496 3 439 5 619 8 611 12 254 20 196 27 657 39 741 6 929 1 984 2 917 4 020 6 568 10 065 14 324 23 607 32 328 46 452 7 1 063 2 271 3 339 4 601 7 517 11 520 16 393 27 018 36 999 53 164 8 1 197 2 557 3 760 5 182 8 466 12 974 18 463 30 429 41 670 59 876 9 1 332 2 844 4 182 5 763 9 415 14 428 20 533 33 840 46 341 66 588 10 1 466 3 131 4 603 6 343 10 365 15 883 22 602 37 251 51 012 73 300 12 1 734 3 704 5 446 7 505 12 263 18 791 26 741 44 073 60 354 86 724 14 2 003 4 277 6 289 8 667 14 161 21 700 30 881 50 895 69 696 100 148 16 2 271 4 850 7 132 9 828 16 059 24 609 35 020 57 717 79 038 113 572 18 2 539 5 424 7 975 10 990 17 957 27 517 39 159 64 540 88 380-20 2 808 5 997 8 818 12 152 19 855 30 426 43 299 71 362 97 723-22 3 076 6 570 9 661 13 314 21 753 33 335 47 438 78 184 - - 24 3 345 7 144 10 504 14 475 23 651 36 243 51 577 85 006 - - 26 3 613 7 717 11 347 15 637 25 549 39 152 55 716 - - - 28 3 882 8 290 12 190 16 799 27 447 42 061 59 856 - - - 30 4 150 8 864 13 033 17 960 29 346 44 969 63 995 - - - 32 4 418 9 437 13 876 19 122 31 244 47 878 68 134 - - - 34 4 687 10 010 14 719 20 284 - - - - - - 36 4 955 10 583 15 562 21 445 - - - - - - 38 5 224 11 157 16 405 22 607 - - - - - - 40 5 492 11 730 17 248 23 769 - - - - - - 5
Technical data Model type SV604 SV607 Valve size DN20-150 DN20-150 DN65-150 Connections Materials Inlet PN40 or ANSI 300 PN25 PN16 Outlet PN16 or ANSI 150 PN16 Body and Bonnet Cap Seat Carbon steel SG iron GSC 25 GGG 40.3 SG iron SG iron GGG 40.3 GGG 40.3 Stainless steel Stainless steel 1.4057 1.4057 Disc Stainless steel Stainless steel Hardened 1.4021 Hardened 1.4021 Body design PN40 PN25 PN16 Set pressure range 0.2 to 40 bar 0.2 to 25 bar 0.2 to 16 bar Limiting Temperature range -10 C to +400 C -10 C to + 350 C conditions Chrome-vanadium alloy steel -10 C to +230 C Spring Tungston alloy steel +231 C to +400 C Backpressure, maximum up to 10% of set pressure (gauge) Dimensions and weights (approximate) in mm and kg C B D A Connection Dimensions Weight Flow Ø Inlet Outlet Lift A B C D SV604 SV607 DN20 DN32 5.2 85 95 385 17.1 10.5 10.5 DN25 DN40 6.5 100 105 435 23.8 12.5 11.5 DN32 DN50 8.3 110 115 450 30.7 16.0 15.0 DN40 DN65 10.4 115 140 520 38.1 18.0 18.0 DN50 DN80 13.7 120 150 535 50.2 20.0 22.0 DN65 DN100 16.5 140 170 710 59.0 40.0 38.0 DN80 DN125 20.0 160 195 790 73.0 56.0 53.0 DN100 DN150 25.5 180 220 835 91.0 77.0 75.0 DN125 DN200 29.3 200 250 1 042 105.0 120.0 115.0 DN150 DN250 35.5 225 285 1 165 125.0 190.0 180.0 6
Installation Safety valve mounted with spindle vertical Pipe adequately supported Drain discharge to safe place Continuous fall Drain discharge to safe place When installing safety valves, the following salient points should be observed. If in any doubt contact your Spirax Sarco engineer. n The safety valve should always be fitted with the centre line of the spring housing vertically above the valve. n There should not be any shut-off device on the inlet or outlet of the safety valve. n The discharge pipework must not be smaller in diameter than the valve outlet. n No undue stresses should be imposed on installation which may cause distortion and leakage. n If a rise in the discharge pipework cannot be avoided, a small bore drain should be provided at the point where water could collect, and a drain pipe connected to the valve drain plug. n Discharge pipework should be sized in such a way that built-up back pressure does not exceed 12% of the set pressure. n Spirax Sarco Installation and Maintenance Instructions should be consulted prior to installation. SV60 safety valve selection guide Model type SV60 SV60 Body material 4 = Cast steel 4 7 = SG iron Configuration A = Closed bonnet / easing lever B = Closed bonnet / gas tight cap C = Closed bonnet / packed easing lever D = Open bonnet / easing lever A Seal material S = Stainless steel with chrome-vanadium spring S T = Stainless steel with tungsten alloy spring Inlet connection PN16, PN25, PN40, ANSI 300 PN40 Selection example SV60 4 A S PN40 How to order Example: 1 off Spirax Sarco DN50 SV604AS PN40 inlet with a set pressure of 6 bar 7
Spirax Sarco products, service and support A partnership with Spirax Sarco provides knowledge, service and products worldwide for the control and efficient use of steam and other industrial fluids. Technical support Experienced technical engineers are available to assist with the study of plant layout and application problems, leading to the correct sizing and selection of equipment using dedicated software. Spare parts Spare parts and expert advice are provided through a networked organisation at global level, and Spirax Sarco warehouses with local assistance from specialists. Our comprehensive product range includes: l Boiler controls l Flowmeters l Pneumatically and electrically actuated control valves l Pressure reducing valves l Self-acting temperature control valves l Programmable electronic controllers l Pneumatic transmitter controllers l Safety valves l Steam traps After sales service Repairs can be carried out either at the plant or at our central workshops, by expert, highly specialist technicians. Calibrating equipment is a service provided in each of the 39 subsidiaries throughout our worldwide organisation. l Steam trap monitoring systems l Condensate pumps l Flash vessels l Separators l Strainers Training Correct sizing, application and calibration are among the main factors contributing to success in solving control problems. Spirax Sarco offers a worldwide organisation for training at its 35 fully equipped technical training centres. l Stop valves l Check valves l Humidifiers l Complete packaged solutions Some of the products may not be available in certain markets. Spirax-Sarco Limited, Charlton House, Cheltenham, Gloucestershire, GL53 8ER UK. Tel: +44 (0)1242 521361 Fax: +44 (0)1242 573342 E-mail: Enquiries@SpiraxSarco.com Internet: www.spiraxsarco.com Copyright 2005 Spirax Sarco is a registered trademark of Spirax-Sarco Limited 8 SB-S13-36 CH Issue 3