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Do OSHA safety regulations apply to RPZ and DCDA backflow preventers?
OSHA requires 30 inches to the face off a side wall for maintenance for horizontal installations. My contention is that if the drain to the RPZ runs to that wall, you will have an obstruction and trip hazard, and it will not be accessible for maintenance. I've also installed the RPZs 4 feet above the tight pump room floors for access. It's never been a problem. Please advise. IBC says to install backflow preventers according to the manufacturer's instructions. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments
Our State Department of Natural Resources requires a double check on all water based sprinkler systems and an RPZ backflow when additives such as foam or antifreeze are used.
The rule is for containment. Meaning that the first available connection requires the backflow preventer. With the details shown in NFPA 13 there are examples of check valves with a drilled clapper as well as an appropriate backflow preventer in the examples shown appear to be isolation devices. NFPA 13 FIGURE 8.6.3.3 shows a backflow preventer and includes an expansion tank. If the entire building is protected by an RPZ the water department is satisfied. When approaching the antifreeze pipe arrangement FIGURE 8.6.3.3 wouldn’t a swing check without a drilled hole be equal to the backflow preventer? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe We have an NFPA 13 commercial project.
Do you allow a domestic water tap coming from an NFPA 13 fire sprinkler riser? If it is allowed, what provisions should I be looking for when reviewing a layout with this arrangement? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe |
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