Vinyl Chloride to Ammonia
Vinyl Chloride to Ammonia
(OP)
Does anyone have a good technical reference or insight on changing a vessel's commodity? I have a old rail car that stored vinyl chloride that I want to use to contain ammonia, and wanted to know if there are any concerns in doing so.
Thanks!
Thanks!





RE: Vinyl Chloride to Ammonia
RE: Vinyl Chloride to Ammonia
Have not been able to find good technical references regarding common commodities meeting each other when tank substances are changed. Is there a standard cleaning method used before changing out commodity?
RE: Vinyl Chloride to Ammonia
T1 is ASTM A514, 517 type material.
RE: Vinyl Chloride to Ammonia
RE: Vinyl Chloride to Ammonia
RE: Vinyl Chloride to Ammonia
"Containers shall be stress relieved after fabrication in accordance with the Code."
Poorly written clause. Their intent is that all welds receive PWHT 'for process', including small nozzles. This differs from the ASME VIII requirement of PWHT based on thickness and/or materials of construction.
Go to OSHA.gov and read the whole of 1910.111, including the Intrepretation letters. Among other 'perversions' of the B31.3 Code, OSHA does not allow threads on Sch40 pipe [welds only -- prudent], but refuses to allow backwelding of threads on anything thinner than Sch80 [not a B31.3 requirement, just a ridiculously stringent requirement thought up by OSHA burocrats]. Thus all installed threaded Sch40 is required by law to be removed. You need to be well-informed about the OSHA requirements before you start your project.