Commercial Plumbing Installation
Piping Principles – FAQ; Part 2
We get asked a lot of questions around the topic of commercial plumbing installation, and have put together this article as a follow up to our Part 1 article (Commercial Plumbing Installation: Piping Principles FAQ) to address the top questions posed. Following are answers to additional frequently asked questions about the principles of piping.
- When syphon drainage is necessary during commercial plumbing installation, should the syphon pipe be sized one size smaller than the nominal size for the trap?
- Yes, but never less than 1/2″ (15 mm).
- Whenever possible, should condensate be pumped versus gravity drainage?
- What might result when two steam-consuming units are drained by a single trap?
- Short circuiting.
- When condensate is returned overhead, can a check valve sometimes be used during commercial plumbing installation?
- Does every 2 feet (0.6 m) of lift in syphon drainage increase pressure differential by 1 PSI (0.68 bar)?
- Is it safe to say for any commercial plumbing installation that a steam trap be located as close to the drip point as possible?
- If a safety drain trap is used, should it be located below the primary trap?
- No, it is not necessary for all commercial plumbing installation projects.
- What is recommended when installing steam systems in freezing environments?
- Keep trap discharge lines as short as possible, insulate all supply, discharge and return lines; and be sure there are no low points in the system that aren’t drained.
- Is it best to locate a steam trap below the drip point?
- If unions are used on both sides of the steam trap, should they be in-line?
- Does trapping by the letters apply only to IB traps?
- Can there be a problem draining two heat exchangers with a single trap?
- Should the diameter of the piping on the outlet of the heat exchanger always be reduced?
- What is a good way to provide an area where dirt and scale can fall out?
- An extended drip leg below the takeoff to the trap.
- Is syphon drainage when the trap must be installed above the drip point?
- What should I do when I have an elevated return line or modulating pressure service with insufficient positive pressure to evacuate the condensate?
- For the purposes of commercial plumbing installation, install a safety drain upstream of the primary trap, install a pumping trap downstream of the primary trap, and install a vented receiver and pump downstream of the primary trap.
Commercial Plumbing Installation Information
For more commercial plumbing installation and piping principles tips, watch for part 2 of this article. Check out the rest of the articles on this site for even more professional and commercial plumbing information!
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