APPENDIX Q—LOW-PRESSURE STORAGE TANKS FOR LIQUEFIED ...

Q.5.4.1 In primary and secondary liquid containers , all opening connections 12 in. or larger in nominal diameter in a shell plate that exceeds 1 in. in thickness shall conform to the spacing requirements for butt and fillet welds described in Q.5.4.2. through Q.5.4.4. ................
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