yhebostress,

Thanks for sharing your views.. as per your opinion below load case are correct or not
lets consider T1=DESIGN TEMP(MAX UPSET SYSTEM TEMP)
T2=NORMAL OPERATING TEMP.
P=DESIGN PRESSURE
U1= SEISMIC COEFFICIENT IN NORTH-SOUTH DIRECTION
U2=SEISMIC COEFFICIENT IN EAST-WEST DIRECTION
D1=SAM IN NORTH-SOUTH DIRECTION
D2=SAM IN EAST-WEST DIRECTION

SR NO LOAD CASE "COMBINATION METHOD"
L1 W+T1+P
L2 W+T2+P
L3 W+P
L4 W+P+T1+D1 (OPE)
L5 W+P+T1-D1 (OPE)
L6 W+P+T1+D2 (OPE)
L7 W+P+T1-D2 (OPE)
L8 W+P+T1+U1 (OPE)
L9 W+P+T1-U1 (OPE)
L10 W+P+T1+U2 (OPE)
L11 W+P+T1-U2 (OPE)
L12 W+P+T1+U1+D1 (OPE)
L13 W+P+T1-U1-D1 (OPE)
L14 W+P+T1+U2+D2 (OPE)
L15 W+P+T1-U2-D2 (OPE)
L16 L12-L4 (SRSS) PURE +U1
L17 L13-L5 (SRSS) PURE -U1
L18 L14-L6 (SRSS) PURE +U2
L19 L15-L7 (SRSS) PURE -U2
L20 L12-L8 (SRSS) PURE SWAY +D1
L21 L13-L9 (SRSS) PURE SWAY -D1
L22 L14-L10 (SRSS) PURE SWAY +D2
L23 L15-L11 (SRSS) PURE SWAY -D2
L24 L3+L16 (ABS) SUSTAINED+SEISMIC
L25 L3+L17 (ABS) SUSTAINED+SEISMIC
L26 L3+L18 (ABS) SUSTAINED+SEISMIC
L27 L3+L19 (ABS) SUSTAINED+SEISMIC
L28 L1-L3 (ALGEBRIC) PURE THERMAL STRESS AT DESIGN TEMP
L29 L2-L3 (ALGEBRIC) PURE THERMAL STRESS AT OPERATING TEMP
L30 L28+L20 (ABS) THERMAL + SWAY
L31 L28+L21 (ABS) THERMAL + SWAY
L32 L28+L22 (ABS) THERMAL + SWAY
L33 L28+L23 (ABS) THERMAL + SWAY


Please go through my load cases, following are my doubts.
does this load case meet retrofit (ASME B31Ea-2010 )requirements?

1) what should be allowable stress for L24 TO L27 ??

2) what should be allowable stress for L30 to L33 ??

kindly correct my load cases if you think insufficient..

Thanks Ohliger,PRADEEPD,Yhebostress for sharing your valuable views.

Hardik Pilojpara
hardik.pilojpara@gmail.com