Low pressure steam boiler piping question

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I am wondering if anyone is familiar with NJ codes on low pressure light commercial boilers.  A perfect example would be a Weil McLain LGB 4 with 4" risers and 4" Header 400,000 BTU.  I know you can pipe it with threaded joints which is a real bear but I was wondering exactly what certifications or qualifications are needed to weld those pipes.  I didn't think it would be ASME section IX because it's less than 15 PSI ( running pressure of  about 1.2 PSI) but I know there has to be some type of standard.Thanks in advance.
Reply:Thread it and forget it. Expando the threads, you dont have to reef on em, let it sit for a few hours, fill, flush, skim, flush, fire....Lincoln Power MIG 210 MP ( boat anchor )Lincoln Weld-Pac 100 HDHobart IronMan 230Cutmaster 42Jackson NexGenSumner Ultra ClampsDWM120
Reply:Originally Posted by MadMax31Thread it and forget it. Expando the threads, you dont have to reef on em, let it sit for a few hours, fill, flush, skim, flush, fire....