Valve Selection

Valve Selection
Given Below are the graphs which can be an easy guide for the selection of the valve pressure class suitable for a particular given temperature and pressure for the most commonly used materials- cost carbon steel (ASTMA 216 Gr.WCB) and SS-316 (ASTMA 351 Gr. CF8M).
pressure_temperature_limitation
material_cast
Choosing for Valve for high pressure and high temperature is now so easy:-

ASME B 16.34

Maximum Allowable Non-Shock Pressure in psig

Service Temperature

Class 150

Class 300

Class 600

Deg. F Deg. C WCB(a) WC1(b)(c) WC6(c)(d) WC9(c)(d) C5(c) WCB(a) WC1(b)(c) WC6(c)(d) WC9(c)(d) C5(c) WCB(a) WC1(b)(c) WC6(c)(d) WC9(c) C5(c)
-20 to -29 to
100 38 285 365 290 290 290 740 695 750 750 750 1480 1395 1500 1500 1500
200 93 260 255 260 260 260 680 660 750 750 750 1360 1320 1500 1500 1500
300 149 230 230 230 230 230 655 640 720 730 730 1310 1275 1445 1455 1455
400 204 200 200 200 200 200 635 645 695 705 705 1265 1230 1385 1410 1410
500 260 170 170 170 170 170 605 585 665 665 665 1205 1175 1330 1330 1330
600 316 140 140 140 140 140 570 550 605 605 605 1135 1105 1210 1210 1210
650 343 125 125 125 125 125 550 535 590 590 590 1100 1065 1175 1175 1175
700 371 110 110 110 110 110 530 510 570 570 570 1060 1025 1135 1135 1135
750 399 95 95 95 95 95 505 475 530 530 530 1015 955 1065 1065 1065
800 427 80 80 80 80 80 410 390 510 510 510 825 780 1015 1015 1015
850 454 65 65 65 65 65 320 300 485 485 485 640 595 975 975 975
900 482 50 50 50 50 50 230 200 450 450 375 460 405 900 900 745
950 510 35 35 35 35 35 135 135 320 385 275 275 275 640 755 550
1000 538 20 20 20 20 20 85 85 215 265 200 170 170 430 535 400
1050 566 20 20 20 145 175 145 290 350 290
1100 593 20 20 20 95 110 100 190 220 200
1150 621 20 20 20 65 70 60 130 135 125
1200 649 15 15 15 40 40 35 80 80 70

Service Temperature

Class 900

Class 1500

Class 2500

Deg. F Deg. C WCB(a) WC1(b)(c) WC6(c)(d) WC9(c)(d) C5(c) WCB(a) WC1(b)(c) WC6(c)(d) WC9(c)(d) C5(c) WCB(a) WC1(b)(c) WC6(c)(d) WC9(c)(d) C5(c)
-20 to -29 to
100 38 2220 2090 2250 2250 2250 3705 3480 3750 3750 3750 6170 5805 6250 6250 6250
200 93 2035 1980 2250 2250 2250 3395 3300 3750 3750 3750 5655 5505 6250 6250 6250
300 149 1965 1915 2165 2185 2185 3270 3190 3610 3640 3640 5450 5315 6015 6070 6070
400 204 1900 1845 2080 2115 2115 3170 3075 3465 3530 3530 5280 5125 5775 5880 5880
500 260 1810 1760 1995 1995 1995 3015 2930 3325 3325 3325 5025 4885 5540 5540 5540
600 316 1705 1655 1815 1815 1815 2840 2755 3025 3025 3025 4730 4595 5040 5040 5040
650 343 1650 1600 1765 1765 1765 2745 2665 2940 2940 2940 4575 4440 4905 4905 4905
700 371 1590 1535 1705 1705 1705 2665 2560 2840 2840 2840 4425 4270 4730 4730 4730
750 399 1520 1430 1595 1595 1595 2535 2385 2660 2660 2660 4230 3970 4430 4430 4430
800 427 1235 1175 1525 1525 1525 2055 1955 2540 2540 2540 3430 3255 4230 4230 4230
850 454 955 895 1460 1460 1460 1595 1490 2435 2435 2435 2655 2485 4060 4060 4060
900 482 690 605 1350 1350 1120 1150 1010 2245 2245 1870 1915 1685 3745 3745 3115
950 510 410 410 955 1160 825 685 685 1595 1930 1370 1145 1145 2655 3220 2285
1000 538 255 650 650 800 595 430 430 1080 1135 995 715 715 1800 2230 1655
1050 566 430 525 430 720 875 720 1200 1455 1200
1100 593 290 330 300 480 550 495 800 915 830
1150 621 195 205 185 325 345 310 545 570 515
1200 649 125 125 105 205 205 170 345 145 285

Note : (a) Permissible, but not recommended for prolonged usage above 800°F. Upon prolonged exposure to temperature above 800°F, the carbide phase of Carbon Steel may be converted to Graphite.

(b) Permissible, but not recommended for prolonged usage above 875°F.

(c) Use normalized and tempered material only.

(d) Not to be used over 1100°F.

(e) For welded and valved only. Flanged end ratings terminate at 1,000°F, for WC6, WC9, & C5 materials.

(f) 1 psi = 0.070 kg./Sq. cm.

ASME B 16.34

Maximum Allowable Non-Shock Pressure in psig

Service Temperature

Class 150

Class 300

Class 600

Deg. F Deg. C CF8(1) CF8M(1) CF8(1) CF8M(1) CF8(1) CF8M(1)
-20 to -29 to psig psig psig psig psig psig
100 38 275 275 720 720 1440 1440
200 93 230 235 600 620 1200 1240
300 149 205 215 540 560 1075 1120
400 204 190 195 495 515 995 1025
500 260 170 170 465 480 930 955
600 316 140 140 440 450 885 900
650 343 125 125 430 440 865 885
700 371 110 110 420 435 845 870
750 399 95 95 415 425 825 855
800 427 80 80 405 420 810 845
850 454 65 65 395 420 790 835
900 482 50 50 390 415 780 830
950 510 35 35 380 385 765 775
1000 538 20 20 355 365 710 725
1050 566 20 20 325 360 650 720
1100 593 20 20 255 305 515 610
1150 621 20 20 205 235 410 475
1200 649 20 20 165 185 330 370
1250 677 20 20 135 145 26 295
1300 704 20 20 115 115 225 235
1350 752 20 20 95 95 185 190
1400 760 20 20 75 75 150 150
1450 788 20 20 60 60 115 115
1500 816 15 15 40 40 85 85

Service Temperature

Class 900

Class 1500

Class 2500

Deg. F Deg. C CF8(1) CF8M(1) CF8(1) CF8M(1) CF8(1) CF8M(1)
-20 to -29 to psig psig psig psig psig psig
100 38 2160 2160 3600 3600 6000 6000
200 93 1800 1860 3000 3095 5000 5160
300 149 1615 1680 2690 2795 4480 4660
400 204 1490 1540 2485 2570 4140 4280
500 260 1395 1435 2330 2390 3880 3980
600 316 1325 1355 2210 2255 3680 3760
650 343 1295 1325 2160 2210 3600 3680
700 371 1265 1305 2110 2170 3520 3620
750 399 1240 1280 2065 2135 3440 3560
800 427 1215 1265 2030 2110 3380 3520
850 454 1190 1255 1980 2090 3300 3480
900 482 1165 1245 1945 2075 3240 3460
950 510 1145 1160 1910 1930 3180 3220
1000 538 1065 1090 1770 1820 2950 3030
1050 566 975 1080 1630 1800 2715 3000
1100 593 770 915 1285 1525 2145 2545
1150 621 615 710 1030 1185 1715 1970
1200 649 495 555 825 925 1370 1545
1250 677 400 440 670 735 1115 1230
1300 704 340 350 656 585 945 970
1350 752 280 290 465 480 770 800
1400 760 225 225 380 380 630 630
1450 788 175 175 290 290 485 485
1500 816 125 125 205 205 345 345