We often order ASTM A420 WPL6 butt-weld pipe fittings for low temp service. Lately, we have received fittings from pipe vendors that are only stamped with the heat # and WPL6. There is no A420 designation on the fitting. These are often import fittings (the fittings I looked at were from...
Hi all,
I've got a customer with ammonia refrigeration piping installed circa 1977. I'm trying to find out if there was a requirement in the 1974 edition of B31.5 that required sch.80 pipe for carbon steel liquid lines smaller than 2" NPS in refrigerant group B2.
I've got B31.5 editions from...
Hi all,
I've got a customer with ammonia refrigeration piping installed circa 1977. I'm trying to find out if there was a requirement in the 1974 edition of B31.5 that required sch.80 pipe for carbon steel liquid lines smaller than 2" NPS in refrigerant group B2.
I've got B31.5 editions from...
For exterior low temp refrigeration piping (50F or lower) we always use either styrofoam or isocyanurate, no fiberglass. But even more important than the insulation is the vapor barrier, which is either ASJ paper or Saran for straight runs, mastic for the fittings. Then the aluminum jacketing...
