Ignore my above post and consider this..


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 PURE +U1
L17= L13-L5 PURE -U1
L18=L14-L6. PURE +U2
L19=L15-L7. PURE -U2
L20=L12-L8. PURE SWAY +D1
L21=L13-L9. PURE SWAY -D1
L22=L14-L10 PURE SWAY +D2
L23= L15-L11 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
_________________________
Hardik Pilojpara,
Pipe Stress Engineer.
India.
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