Maximum Pressure for 1" and 1-1/2" Hose Valves?

2/11/2022

Is it necessary to reduce the pressure serving hose connections or hose cabinets when there are the 1-1/2" or 1-inch hose connections installed in a facility?

What is the maximum allowable pressure for these type of hose connections?

Thanks in advance.

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7 Comments

Dan Wilder

2/11/2022 07:15:23 am

As I just came across this the other day...

NFPA 13 16' Ed Section 8.17.5.1 provides all this info.

Residual pressure shall not exceed 100 PSI (NFPA 13 & 14), minimum pressure shall be 65 PSI (NFPA 14 16' ed 7.8)

Note of distinction, these requirements are in 13 because they are not technically for fire department use. Section 8.17.5.2 goes further into hose valves for Fire Department use requirements because they are fed from a sprinkler system where as "Standpipe" requirements would fall under NFPA 14 and are typically a dedicated system (combined with a Class I or Class III system).

Jesse

2/11/2022 08:07:35 am

For 1.5" hose connections the maximum residual pressure is 100-psi and the minimum residual pressure is 65-psi

Barry Carr

2/11/2022 08:14:13 am

Class 2 Standpipe System with a 1 1/2 inch connection. The minimum design pressure for a standpipe system is contained in Section 7.8, “Minimum and Maximum Pressure Limits,” of NFPA 14. A hydraulically designed system is required to provide a minimum residual pressure of 100 psi at the most remote location in the building.

Jesse

2/11/2022 11:49:22 am

Not sure I agree here. 2016 NFPA 14 7.8 specifically references 2.5" connections. The OP's question involves 1.5" hose connections.

This is address in both 2016 NFPA 13 8.17.5.2 and 2016 NFPA 14 7.2.3.1

100-psi is the maximum residual before a PRV is required. The minimum residual pressure is 65-psi per 2016 NFPA 14 7.8.1

Glenn Berger

2/11/2022 08:32:41 am

Yes - It is necessary to reduce the pressure in hose stations that are intended for occupant-use. I recommend designing to the absolute minimums for these size hoses.

COLIN LUSHER

2/11/2022 11:59:57 am

If these are 1.5" hose connections are provided per NFPA 13, as required by the AHJ, then the requirements of NFPA 14 do NOT apply.

NFPA 13-2016 section 8.17.5.1.3 explicitly states that Class II requirements of NFPA 14 do not apply to NFPA 13 hose connections. Therefore, there is NO minimum residual pressure. NFPA 13 states that the maximum pressure is 100 psi. This is the only pressure requirement.

Alex

2/14/2022 08:13:54 am

Maximum residual pressure would be 100 PSI.

If the valves are for occupant use and you have a hose still provided in the cabinet (seen often in NYC), I would discuss with the AHJ about removing them. If the fire is too large for a single fire extinguisher, I am an advocate that occupants should evacuate the building, rather than working on extinguishing it.

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Maximum Pressure for 1" and 1-1/2" Hose Valves?

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