The photos below were taken at a project in Minnesota and are of piping sent with five rooftop ammonia refrigeration units. The manufacturer/contractor is from outside of Minnesota and is not licensed to fabricate or install high-pressure piping in Minnesota. The manufacturer/contractor was told not to send any piping, but cut the pieces and "tack welded" them in place. The welds do not even approach code compliance and arc burns are clearly noticeable on the piping.
The manufacturer/contractor also appears to have attempted to weld steel rod to the bottom of the pipe and fittings as a means of support, which is not allowed by code. Many of these welds broke before even reaching the Minnesota project site. The licensed contractor on the site will cut out and replace all of the piping shipped with the units, nearly 300 weld joints.