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PPFA PUBLICATIONS
Plumbing Inspector's Checklist
for CPVC Piping Systems
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Components:
- Tube & Fittings ASTM D2846, NSF 14, (Tan), 1/2" through 2".
- Primer NSF 14 (if required).
- Solvent Cement ASTM F 493, NSF 14.
- Transition fittings; only those designed and recommended for CPVC, including brass ferrule compression connections.
Joining:
- Tube ends free of cracks or splits.
- Ends cut square and free of interior or exterior burrs.
- Joint surfaces clean and dry. Joints solvent welded according to PPFA's CPVC Installation Handbook instructions.
- Wipe off excess.
Underslab Installations:
- Pipe bedded in sand or clean soil. Backfill free of sharp rocks or other harmful materials.
- The completed system tested two hours before pouring cement slab. Before testing, allow all joints to cure sufficiently. Refer to the curing table found under Testing.
- Stub ups protected by 1/2" foam insulation, or other protective sleeving, where they penetrate the slab and at construction joints.
General Recommendations:
- Supports, hangers, and straps free of burrs. Hangers left loose enough to allow for expansion/contraction.
- 1/2" - 1" tube supported every 3'. 1-1/4" and larger sizes supported every 4'.
- Vertical runs supported at floor level and mid story or per engineer's design.
- CPVC through metal studs must be protected.
- CPVC permanently exposed to sunlight protected with a water based latex paint.
- Only thread sealants (Teflon® tapes are preferred) recommended by CPVC fitting and sealant manufacturers should be used.
- Tubing and fittings should not be installed under stress.
- CPVC is acceptable for hot water circulating loops and T & P relief valve drain lines check code.
Testing:
- The following cure times are recommended:
| |
1/2" - 1" |
1-1/4" - 2" |
| Above 60° F |
1 hour |
2 hours |
| 40 - 60° F |
2 hours |
4 hours |
| Below 40° F |
4 hours |
8 hours |
- Test with water at line pressure (150 psi max.). Pressures of up to 400 psi with cold water can be used with double the cure time.
- Testing for a minimum of 1 hour is recommended.
- Air testing is not recommended.
- After testing, thoroughly flush the system for at least 10 minutes to remove residual trace amounts of solvent cement components.
Limitations:
- CPVC shall not be installed downstream of any instantaneous type water heater.
- CPVC shall not be located within 6 of a single wall gas appliance, vent pipe, and/or lighting fixture.
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