Aluminum pipe used for tprv

OK, i feel that the aluminum pipe is not an adequate material for a TPRV discharge, my reasoning is that it is not supposed to handle high pressure and high temps, and it bends super easy therefore making it less resistant to pressure. ’

But how do i convey this, is there something on this i can reference?

Trying to figure how to write this up.

Allowable materials for TPR drain line are the same as for water distribution lines.

Galvanized steel, hard drawn copper, CPVC and most jurisdictions also allow PEX although some don’t.

From the 2006 IRC.

  • P2803.6.1 Requirements for discharge pipe. The discharge piping serving a pressure-relief valve, temperature-relief valve or combination valve shall:
      1. Be constructed of those materials listed in Section P2904.5 or materials tested, rated and approved for such use in accordance with ASME A112.4.1.

TABLE P2904.5
MATERIAL ------------------------------------------------ STANDARD
Brass pipe ------------------------------------------------ ASTM B 43
Chlorinated polyvinyl chloride (CPVC) plastic pipe and tubing - ASTM D 2846; ASTM F 441; ASTM F 442; CSA B137.6
Copper or copper-alloy pipe -------------------------------- ASTM B 42; ASTM B 302
Copper or copper-alloy tubing (Type K, WK, L, WL, M or WM) – ASTM B 75; ASTM B 88; ASTM B 251; ASTM B 447
Cross-linked polyethylene (PEX) plastic tubing ---------------- ASTM F 877; CSA B137.5
Cross-linked polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX) pipe - ASTM F 1281; CSACAN/CSA-B137.10
Cross-linked polyethylene/aluminum/high-density polyethylene (PEX-AL-HDPE) - ASTM F 1986
Galvanized steel pipe ---------------------------------------- ASTM A 53
Polybutylene (PB) plastic pipe and tubing --------------------- ASTM D 3309; CSA CAN3-B137.8
Polyethylene/aluminum/polyethylene (PE-AL-PE) composite pipe - ASTM F 1282
Polypropylene (PP) plastic pipe or tubing ----------------------- ASTM F 2389; CSA B137.11
Stainless steel (Type 304/304L) pipe -------------------------- ASTM A 312; ASTM A 778
Stainless steel (Type 316/316L) pipe -------------------------- ASTM A 312; ASTM A 778

ahh good resources thanks guys

Illinois Plumbing Code:

  1.     Any piping used for discharge from the relief valve shall be of  metallic material and conform with the requirements of Appendix A, Table A  (Approved Materials for Water Distribution Pipe) for potable water piping and  shall drain continuously downward to the outlet. 

Approved Materials for Water Distribution Pipe](
No aluminum listed here.

Don’t think I’ve ever seen an aluminum pipe. Interesting.