CODE(s) for handwashing sink in Restaurant kitchen?

fixizinJuly 28, 2014

A friend of many years, she went and did it--yep, bought herself a restaurant, fully equipped (more or less). Me, I can't resist helping her iron out a few plumbing problems.

One item that jumped out at me was a Rube Goldberg looking rat's nest underneath a simple, single-faucet, stainless steel handwashing sink... a check valve on both the hot and cold inlets, and an anti-scald mixer (thermostatic) valve... is this Code? I ask because I see no such devices on the many "prep" sinks.

What really stands out--and WILL be re-done--is the way it was all cobbled together with klunky compression fittings, and about twice the number of joints needed... Yet Another "plumber" who's afraid of sweat soldering... did I mention the comp fittings are all loaded up with teflon tape?... that's always a give-away... You guessed it--one small adjustment of the sink-to-wall fit and multiple leaks sprouted, lol. Flex hoses for the short-term fix.

Summary: are the check valves and anti-scald device Code Required on any OR ALL sinks in a commercial kitchen?

Thanks in advance.

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bus_driver

Cannot speak to the code that might or might not apply in that jurisdiction. Check valves not required in my area. The check valves in the supply are not a bad idea. They prevent water from the sink or faucet being drawn back into the supply piping if the supply piping should experience a negative pressure.
An episode of the TV series Quincy, M.E. with Jack Klugman featured this problem. The problem is called "cross contamination". I think the episode is Season 5, episode 21 "Deadly Arena".
Suppose that the restaurant is located on a hill. Someone hooks a hose to the spout on the faucet to wash vegetables in the sink. Some dirty water is standing in the sink. The open hose end is in that standing water. A large fire breaks out nearby at a lower elevation. The hydrants are used such that the water pressure up the hill at the restaurant becomes lower than atmospheric ( vacuum). Dirty water could be drawn into the supply system from the sink.
Plumbing is two distinct systems which are NEVER interconnected. One is SUPPLY, the other is DWV.
Faucet spouts (by code) never extend down below the flood rim level of sinks and tubs so that an air gap always exists between the two to prevent cross contamination.
It is reported that a prominent physician said that modern plumbing has done more to improve the health of the American people than has all of medical science.

    Bookmark   July 28, 2014 at 2:28PM
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fixizin

That is excellent background info, and we thank you.

Still, very curious that the prep sinks, where raw meat and such is rinsed off, appear to not have any backflow-prevention devices. =:O

'tis indeed difficult to find links to the actual IPC/UPC Codes, or whatever authority has jurisdiction... will check local building dept. website... some locales actually have their "sierra" together.

    Bookmark   July 29, 2014 at 4:58PM
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