I found a basement installed oil tank with PVC fill and vent lines. The exterior lines are steel, but inside the basement they are PVC and poorly supported. I recommended replacement due to the location, poor supports and possibilities of spills if cracked or broken, especially during a delivery.
However, I can not find anything that says PVC cannot be used interior. I have found a reference to exterior oil fill and vent piping, but not interior. The use of PVC seems illogical to me, but does anyone know if it is allowed?
Thanks,
Fred
Taken from:http://www.carpenterandsmith.com/oil_piping.html
Piping materials
http://www.carpenterandsmith.com/pipes.gif
All above ground piping should be iron or steel. Prior to a revision of NFPA 31 in 2001, copper and brass were also listed as acceptable piping materials, and installations completed prior to 2001 using copper or brass are considered to comply with the standards. Unfortunately, there have been a number of tanks incorrectly installed with plastic fill and vent pipes; plastic (including PVC) pipes are not suitable because they will burn, and (more important from our point of view) because the become brittle in cold weather and more likely to crack while tanks are being filled. NFPA standards do no specify materials for underground tanks, but they should resist corrosion and be strong enough so underground pipes are not collapsed or crimped by the pressure of the earth, frost, etc.
