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The document outlines the procedure for requesting a backflow preventer exemption for facilities with one domestic and one fire service. It requires the submission of a letter detailing specific conditions and characteristics of the facility, confirming it does not contain hazardous features that necessitate a backflow preventer. The letter must be sent to the Cross-Connection Control Unit for approval.

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When should a double check valve be used?

A double check valve is used for fluid category 3 protection, where there is a risk of substances of low toxicity such as common disinfectants.

Can a backflow preventer cause low water pressure in house?

One of the leading reasons for low sprinkler water pressure relates to the valves on your backflow preventer device. If you notice limited water pressure in your sprinkler system but normal water pressure inside your home, then the problem might be that your backflow preventer valves are not completely open.

Can backflow preventer installed vertically?

There are backflow preventers that can be installed horizontally, vertically (up or down) and other orientations that can make an installation easier. The key point to realize however is that they can only be installed in the orientation that the approval agency has determined they will work in.

dep cross connection form

Nyc dep cross connection requirements NYC DEP Cross Connection Control Unit phone number Nyc dep cross connection phone number NYC-DEP Cross Connection Handbook NYC DEP Backflow application NYC backflow prevention requirements Nys backflow prevention requirements Backflow test form online submission

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How does a double check valve work?

A double check valve is a backflow prevention device designed to protect water supplies from contamination. It consists of two autonomously acting, spring-loaded check valves. It includes shutoff valves at each end of the piece and very small ball valves.

How high does a backflow preventer need to be?

Backflow preventers installed inside must be a minimum distance of twelve (12) inches above the floor, and no higher than four (4) foot above the floor, with adequate clearance around the backflow preventer for testing and/or repair.

How does a double check backflow work?

It consists of two check valves assembled in series. This employs two operating principles: firstly one check valve will still act, even if the other is jammed wide open. Secondly the closure of one valve reduces the pressure differential across the other, allowing a more reliable seal and avoiding even minor leakage.

How much does it cost to rebuild a backflow prevention device?

Installing or replacing a backflow preventer costs $300 for the average homeowner. However, actual project costs fall somewhere between $135 and $1,000 based on the system sizes and styles you choose. Your project costs break down into materials and labor.

How do you know if a backflow preventer is bad?

Water Flow Is Slow One of the simplest signs that your backflow preventer is bad stems from the flow of water. You may not know until it's too late\u2014like if the fire sprinklers go off for the first time in a while.

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