Approval Date: December 16, 2013 Cases will remain available for use until annulled by the applicable Standards Committee B16 Case 1 High Strength/High Temperature Material ASME B16.34 Group 3 Valves ASME B16.34 Valves Flanged, Threaded, and Welding End Inquiry: Is there an acceptable alternative method for the Pressure-Temperature rating of Standard, Special, Limited and Intermediate Class ASME B16.34 threaded and welding end valves constructed of high strength/high temperature Group 3 forging, casting, plate, rod, seamless pipe or tube materials listed in Table 1 of ASME B16.34? Reply: It is the opinion of the committee that Standard, Special, Limited and Intermediate Class threaded and welded end valves constructed of Group 3 alloys of Table 1 of ASME B16.34 and complying with the rules of ASME B16.34 may be pressure temperature rated to the rules of this Case provided the following rules are met: (a) The Standard Class rules of B-2, Appendix B of ASME B16.34 shall be used to determine the Selected Stress S 1 and pressure-temperature rating but the Ceiling Pressure (p ca ) used in Equation (B-2) shall be in accordance with Table 1 of this Case. (b) The Special Class rules of B-3, Appendix B of ASME B16.34 shall be used to determine the Selected Stress S 2 and pressure-temperature rating but the Ceiling Pressure (p cb ) used in Equation (B-4) shall be in accordance with Table 2 of this Case. (c) The Limited Class rules of Appendix V of B16.34 apply but the Special Class ratings as determined from (b) above shall be used to determine the Limited Class pressure temperature ratings for valves under this Case. (d) For Standard, Special or Limited Intermediate Class Designation valves the rules of B-4, Appendix B of ASME B16.34 shall be used to determine the pressure-temperature ratings based on Standard, Special or Limited Class pressure-temperatures as determined from (a), (b) or (c) above. The Intermediate Class valve wall thickness shall also be determine by the rules of B-4, Appendix B of B16.34. (e) Pressure boundary body joint, body-bonnet or cover bolting material from Table 1 of B16.34 shall be selected that supports the full pressuretemperature rating range of the valve. (f) Valves constructed under this B16 Case shall have the Case Number shown on the valve nameplate.
Table 1 A Standard Class PRESSURE by CLASS, psig Temperature 150 300 600 900 1500 2500 4500 F 20 to 100 290 750 1500 2250 3750 6250 11250 200 260 750 1500 2250 3750 6250 11250 300 230 730 1455 2185 3640 6070 10925 400 200 705 1410 2115 3530 5880 10585 500 170 665 1330 1995 3325 5540 9965 600 140 635 1270 1905 3175 5290 9525 650 125 620 1235 1855 3090 5155 9275 700 110 605 1205 1805 3010 5015 9025 750 95 570 1140 1710 2850 4750 8545 800 80 540 1075 1615 2695 4485 8065 850 65 510 1025 1535 2560 4265 7675 900 50 485 970 1460 2425 4045 7280 950 35 450 905 1350 2250 3750 6750 1000 20 415 825 1245 2075 3455 6215 1050 20 395 790 1185 1970 3285 5915 1100 20 375 750 1120 1870 3115 5610 1150 20 310 615 925 1535 2560 4610 1200 20 240 480 725 1205 2005 3610 1250 20 200 405 605 1010 1685 3030 1300 20 165 325 490 815 1360 2450 1350 20 130 255 385 640 1070 1920 1400 20 90 185 275 465 775 1390 1450 20 75 145 215 360 600 1085 1500 15 50 105 155 260 435 780 1550 1600 1650 2
Table 2 B-Special Class PRESSURE by CLASS, psig Temperature F 150 300 600 900 1500 2500 4500 20 to 100 290 750 1500 2250 3750 6250 11250 200 290 750 1500 2250 3750 6250 11250 300 290 750 1500 2250 3750 6250 11250 400 290 750 1500 2250 3750 6250 11250 500 290 750 1500 2250 3750 6250 11250 600 290 750 1500 2250 3750 6250 11250 650 290 750 1500 2250 3750 6250 11250 700 280 750 1500 2250 3745 6245 11240 750 280 750 1495 2245 3740 6235 11225 800 275 740 1485 2225 3710 6180 11125 850 260 685 1365 2050 3415 5690 10245 900 230 625 1250 1870 3120 5200 9360 950 180 550 1105 1655 2760 4600 8280 1000 160 480 960 1440 2400 3995 7195 1050 160 475 945 1420 2370 3950 7105 1100 155 465 935 1400 2335 3895 7010 1150 130 385 770 1155 1920 3200 5765 1200 100 300 605 905 1505 2510 4515 1250 90 250 505 760 1265 2105 3790 1300 65 205 410 610 1020 1700 3060 1350 50 160 320 480 800 1335 2400 1400 35 115 230 350 580 965 1740 1450 30 90 180 270 450 750 1355 1500 20 65 130 195 325 540 970 1550 1600 1650 3
SUPPORTING INFORMATION 1. Class 150 ceiling pressures have not been increased from inception and are not proposed to be increased by the proposed Case. 2. Material Group 3.19 (typical B564 N06230) has been selected to provide the ceiling pressures at elevated temperatures for both Standard and Special Class. This material can be used for Section I construction to 1650F and Section VIII to 1800F. It has a higher allowable stress and Modulus of Elasticity (E) than Material Group 2.2 (typical A182 F316), which is the material that currently establishes the ceiling pressure for Standard and Special Class valves from 950F to 1500F. 3. For Standard Class the current B16.34-2009 ceiling pressures to 500F has been retained. For Standard Class above 500F the current Standard Class ceiling pressures have been increased by multiplying them by the Ratio of Modulus of Elasticity (E) of Material Group 3.19 (N06230) at temperature to that of the Current Ceiling Material E at temperature. 4. For Special Class the current B16.34-2009 ceiling pressures to 650F have been retained. For Special Class above 650F the current Special Class ceiling pressures have been increased by multiplying them by the Ratio of Modulus of Elasticity (E) of Material Group 3.19 (N06230) at temperature to that of the Current Ceiling Material E at temperature. For 650F, 700F and 750F a transition pressure has been applied, which is less than the multiple of current pressure x ratio of Es. Reason: The multiple is greater than ceiling pressure at above temperature. The proposed Case does not change the ASME B16.34 Appendix B method for pressure-temperature rating. Only the ceiling pressures (pca and pcb) are proposed to be changed. 5. The proposed Case will maintain the Valve Joint rules of Para. 6.4 of B16.34-2009. The bolting stress at 100F will still be in balance with the bolting stress at the valve s primary pressure (Class). Allowing the 100F rating of the valve to exceed 2.5 x Pressure Class can cause the bolting stress at 100F to lose compatibility with the 9000 psi and 7000 psi requirement of 6.4.1.1 and 6.4.2.1 of B16.34, respectively. 6. If the Proposed Case is adopted it will have no impact on pressure-temperature ratings for the Group 1 or Group 2 materials in Table 1 of B16.34-2009. It will not impact flanged valves ratings made from Group 1, 2, or 3 materials. 7. Only a few of the pressure-temperature ratings of the Group 3 materials of Table 1 of B16.34 will have a pressure-temperature increase due to the proposed increase in ceiling pressures of this Case. 8. Tables 1A and 1B is the E data and the Ratio (C/A) on which the proposed Ceiling Pressure increases were calculated. The Ratio (B/A) for A182 F91/F92 Modulus of Elasticity (E) versus E for ceiling material is given for information. Even though the F91/F92 are limited to 1200F the C/A ratio indicates these materials could also withstand higher pressures than the current ceiling materials without additional deflection. 4
TEMP TEMP MATERIAL GROUP NO. Table #1A ASME B16.34 STANDARD CLASS MODULUS OF ELASTICITY DATA MATERIAL GROUP NO. (TYPICAL ALLOY) A MATERIAL Table #1B ASME B16.34 SPECIAL CLASS MODULUS OF ELASTICITY DATA A MATERIAL B A182 F91/F92 B A182 F91/F92 C ASTM B564 N06230 B/A C/A 70 1.2 (A216 WCC) 29.4 31 1.05 30.6 1.04 200 1.2 28.8 30.3 1.05 29.9 1.04 300 1.2 28.3 29.7 1.05 29.5 1.04 400 1.2 27.9 29.2 1.05 29.0 1.04 500 1.2 27.3 28.6 1.05 28.6 1.05 600 1.9 (A182 F11) 26.9 28.1 1.04 28.2 1.05 700 1.9 26.2 27.5 1.05 27.7 1.06 800 1.9 25.6 26.9 1.05 27.2 1.06 900 1.9 24.8 26.2 1.06 26.7 1.08 1000 2.2 (A182 F316) 22.8 25.4 1.11 26.1 1.14 1100 2.2 22.0 24.4 1.11 25.5 1.16 1200 2.2 21.2 23.3 1.10 24.9 1.17 1300 2.2 20.3 22 1.08 24.2 1.19 1400 2.2 19.2 20.5 1.07 23.6 1.23 1500 2.2 18.1 22.8 1.26 E data from ASME Section II, Part D, 2010 Edition thru. 2011 addenda C ASTM B564 N06230 B/A C/A 70 1.2 (A216 WCC) 29.4 31 1.05 30.6 1.04 200 1.2 28.8 30.3 1.05 29.9 1.04 300 1.2 28.3 29.7 1.05 29.5 1.04 400 1.2 27.9 29.2 1.05 29.0 1.04 500 1.2 27.3 28.6 1.05 28.6 1.05 600 1.10 A182 F22 27.7 28.1 1.01 28.2 1.02 700 1.10 27.0 27.5 1.02 27.7 1.03 800 1.10 26.3 26.9 1.02 27.2 1.03 900 1.10 25.6 26.2 1.02 26.7 1.04 1000 2.2 A182 F316 22.8 25.4 1.11 26.1 1.14 1100 2.2 22.0 24.4 1.11 25.5 1.16 1200 2.2 21.2 23.3 1.10 24.9 1.17 1300 2.2 20.3 22 1.08 24.2 1.19 1400 2.2 19.2 20.5 1.07 23.6 1.23 1500 2.2 18.1 22.8 1.26 E data from ASME Section II, Part D, 2010 Edition thru. 2011 addenda 5