Hi,
I'm fighting with a existing power plant where steam turbine pedestal grow 41mm upward in 20 years due to contamination of chloride.
Asme B31.1 doesn't specify requirement (allowable) for the effect of nonrepeated anchor movement.
ASME III NC, ND for settlement give allowable equal to 3Sc calculated in accordance with eq (10a) of NC-3653.2(b).
Here my load cases:
L1=W+H HGR
L2=W+D1+T1+P1+H HGR
L3=WW+HP+H HYD
L4=W+D1+D9+T1+P1+H OPE D1=equip. thermal displ. D9=settlement
L5=W+D2+D9+T2+P2+H OPE D2=equipment thermal displ.
L6=W+D2+D3+D9+T2+P2+H+WIN1 OPE D3=snubber displ.
L7=W+D2+D3+D9+T2+P2+H+WIN2 OPE
L8=W+D2+D3+D9+T2+P2+H+U1 OPE
L9=W+D2+D3+D9+T2+P2+H-U1 OPE
L10=W+D2+D3+D9+T2+P2+H+U2 OPE
L11=W+D2+D3+D9+T2+P2+H-U2 OPE
L12=W+D2+D3+D9+T2+P2+H+U3 OPE
L13=W+D2+D3+D9+T2+P2+H-U3 OPE
L14=W+D9+P1+H OPE
L15=W+D9+P2+H OPE
L16=W+P1+H SUS
L17=W+P2+H SUS
L18=L4-L16 EXP
L19=L5-L17 EXP
L20=L6-L5 OCC
L21=L7-L5 OCC
L22=L8-L5 OCC
L23=L9-L5 OCC
L24=L10-L5 OCC
L25=L11-L5 OCC
L26=L12-L5 OCC
L27=L13-L5 OCC
L28=L20+L17 OCC
L29=L21+L17 OCC
L30=L22+L17 OCC
L31=L23+L17 OCC
L32=L24+L17 OCC
L33=L25+L17 OCC
L34=L26+L17 OCC
L35=L27+L17 OCC

is it correct take into account settlement in expansion, OPE+settlement-SUS without settlement (L4-L16)?
Or need I to check the settlement as OPE+settl. - OPEwithout settl. and then add SUS, like occasional combination?
About other occasional loads like wind or earthquake, is it correct add the settlement?
Nonrepeated anchor movement are considered in the same way of the cold spring?
I would like to know if there is a way to have output with 3Sc or if I calculate ratio by hand.

Thanks in advance.

B31.1 102.3.2 (B.2): Noncyclic Displacement Stress Ranges. Stress ranges caused by noncyclic movements such as those due to settlement or uplift of pipe-supporting structures or components such as buildings, pipe racks, pipe anchors, or rigid supports will not significantly influence fatigue life. Stress ranges caused by such movements may be calculated using eq. (17), replacing SA with an allowable stress range of 3.0SC and replacing MC with the moment range due to the noncyclic movement. The stress ranges due to noncyclic displacements need not be combined with cyclic stress ranges in accordance with (B.1) above.

Dear Mamacint,
thanks for your answer, so if I correctly interpreted the code, with reference with load cases below, I need to create settlement case by L16-L18 (EXP) that means only settlement vector that in my case is D9 and then calculate by hand the stress ratio (I have CII ver. 5.3).

Legend: D1, D2=cyclic thermal displ.; D3= snubber disp.; D9= noncyclic displacements

L1=W+H HGR
L2=W+D1+T1+P1+H HGR
L3=WW+HP+H HYD
L4=W+D1+T1+P1+H OPE
L5=W+D2+T2+P2+H OPE
L6=W+D1+D9+T1+P1+H OPE
L7=W+D2+D9+T2+P2+H OPE
L8=W+D2+D3+D9+T2+P2+H+WIN1 OPE
L9=W+D2+D3+D9+T2+P2+H+WIN2 OPE
L10=W+D2+D3+D9+T2+P2+H+U1 OPE
L11=W+D2+D3+D9+T2+P2+H-U1 OPE
L12=W+D2+D3+D9+T2+P2+H+U2 OPE
L13=W+D2+D3+D9+T2+P2+H-U2 OPE
L14=W+D2+D3+D9+T2+P2+H+U3 OPE
L15=W+D2+D3+D9+T2+P2+H-U3 OPE
L16=W+D9+P1+H OPE
L17=W+D9+P2+H OPE
L18=W+P1+H SUS
L19=W+P2+H SUS
L20=L4-L16 EXP
L21=L5-L17 EXP
L22=L16-L18 EXP for eval. of stress due to non cyclic movements
L23=L17-L19 EXP for eval. of stress due to non cyclic movements
L24=L8-L7 OCC
L25=L9-L7 OCC
L26=L10-L7 OCC
L27=L11-L7 OCC
L28=L12-L7 OCC
L29=L13-L7 OCC
L30=L14-L7 OCC
L31=L15-L7 OCC
L32=L24+L19 OCC
L33=L25+L19 OCC
L34=L26+L19 OCC
L35=L27+L19 OCC
L36=L28+L19 OCC
L37=L29+L19 OCC
L38=L30+L19 OCC
L39=L31+L19 OCC

Is it the correct way?
Thanks in advance
Regards