Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Fire Protection Piping and Specialties
…111 unchanged lines
# Quality Assurance {toc}
−## Every component that performs a fire protection function shall be listed or approved for fire protection service by a nationally recognized testing laboratory. {note}
+## Every component that performs a fire protection function shall be listed or approved for fire protection service by a nationally recognized testing laboratory.
## A valve, fitting, or device that is merely rated for plumbing or general service is not interchangeable with a fire-service-listed equivalent, even where the body appears identical; the listing certifies tested performance under fire-service pressures and cycling. {note}
…18 unchanged lines
## Pipe and components shall be rated for the maximum system working pressure, which is the greater of the maximum static supply pressure or the pump discharge pressure at churn, plus any required margin.
+```datasheet
+label: Maximum System Static Pressure
+type: range
+unit: psi
+min: 50
+max: 350
+step: 5
+default: 100
+```
+
## The standard 175 psi working pressure class shall be used unless the maximum system pressure exceeds 175 psi, in which case the 300 psi high-pressure class shall be used for all pressure-containing components in the affected portion of the system.
−## A system fed by a fire pump with a churn (no-flow) discharge above approximately 165 psi will commonly exceed the 175 psi class once supply pressure is added; failing to identify this early forces a change order to replace undersized valves and fittings. {note}
−
```datasheet
label: System Working Pressure Class
…5 unchanged lines
```
−```datasheet
−label: Maximum System Static Pressure
−type: range
−unit: psi
−min: 50
−max: 350
−step: 5
−default: 100
−```
+## A system fed by a fire pump with a churn (no-flow) discharge above approximately 165 psi will commonly exceed the 175 psi class once supply pressure is added; failing to identify this early forces a change order to replace undersized valves and fittings. {note}
## CPVC fire protection pipe shall not be used where the ambient or service temperature can exceed 150°F (65°C), and shall not be used in dry-pipe, pre-action, or deluge systems.
…30 unchanged lines
## Underground ductile iron pipe shall conform to AWWA C151, Class 52 unless a different thickness class is required by the depth of cover and external loading.
−## The wall thickness (schedule) of steel pipe shall be selected together with the joining method, because groove dimensions and threadability depend on wall thickness. {note}
+## The wall thickness (schedule) of steel pipe shall be selected together with the joining method, because groove dimensions and threadability depend on wall thickness.
## Schedule 10 steel pipe shall be the default for aboveground steel piping NPS 1-1/4 and larger joined by grooved mechanical couplings.
## Schedule 40 steel pipe shall be used for threaded branch lines NPS 1 and smaller and where the system standard or a corrosive environment calls for the heavier wall.
−## Specifying Schedule 10 pipe while detailing Schedule 40 groove dimensions (or the reverse) produces a groove that does not match the wall and leaks or fails; the schedule and groove specification must be tied together on the shop drawings. {note}
+## Specifying Schedule 10 pipe while detailing Schedule 40 groove dimensions (or the reverse) produces a groove that does not match the wall and leaks or fails; the schedule and groove specification must be tied together on the shop drawings.
```datasheet
…53 unchanged lines
## Grooved coupling gaskets shall be selected for the service: EPDM for standard wet-pipe water service, and a halogenated butyl or fluorocarbon compound for dry-pipe, antifreeze, or chemical-exposure service.
+```datasheet
+label: Grooved Coupling Gasket Compound
+type: select
+options:
+ - "EPDM (wet-pipe water service)"
+ - "Halogenated butyl (dry-pipe/antifreeze)"
+ - "Fluorocarbon (chemical exposure)"
+default: "EPDM (wet-pipe water service)"
+```
+
## An EPDM gasket in an antifreeze loop or a petroleum-exposed environment will swell and fail; the gasket compound is a service-dependent selection, not a default. {note}
+## The primary joining method shall be specified for each piping system, and where a grooved coupling is used, the gasket compound shall be selected for compatibility with the service fluid.
+
```datasheet
label: Primary Joining Method
…10 unchanged lines
```
−```datasheet
−label: Grooved Coupling Gasket Compound
−type: select
−options:
− - "EPDM (wet-pipe water service)"
− - "Halogenated butyl (dry-pipe/antifreeze)"
− - "Fluorocarbon (chemical exposure)"
−default: "EPDM (wet-pipe water service)"
−```
−
# Control Valves {toc}
…58 unchanged lines
# Alarm Valve and Riser Trim {toc}
−## The riser control assembly shall include the alarm or dry-pipe valve, the trim piping, the waterflow alarm device, drains, and the pressure gauges appropriate to the system type. {note}
+## The riser control assembly shall include the alarm or dry-pipe valve, the trim piping, the waterflow alarm device, drains, and the pressure gauges appropriate to the system type.
## A wet-pipe riser shall be provided with an alarm check valve listed for fire protection service, complete with retard chamber, pressure alarm switch, and trim.
…3 unchanged lines
## The alarm valve assembly shall be furnished with one pressure gauge connected above the valve clapper and one connected below, each with a range of 0 psi to 300 psi.
−## Pressure gauges shall be selected with a range of 0 psi to 300 psi so they are not damaged during the 200 psi hydrostatic acceptance test; a 0 psi to 100 psi gauge is pegged and ruined by the test pressure. {note}
+## Pressure gauges shall be selected with a range of 0 psi to 300 psi so they are not damaged during the 200 psi hydrostatic acceptance test; a 0 psi to 100 psi gauge is pegged and ruined by the test pressure.
```datasheet
…29 unchanged lines
# Waterflow and Supervisory Devices {toc}
−## Waterflow shall be detected by a vane-type waterflow switch or by a pressure-type alarm switch, selected for the system size and the requirements of the local fire department. {note}
−## A vane (paddle) switch inserts into the flowing pipe and signals on sustained flow, while a pressure switch senses the pressure rise behind the alarm valve clapper; the choice depends on system size, pipe arrangement, and AHJ preference. {note}
+## Waterflow shall be detected by a vane-type waterflow switch or by a pressure-type alarm switch, selected for the system size and the requirements of the local fire department.
−## A waterflow alarm device shall be provided and wired to the fire alarm control panel to initiate an alarm on system flow.
−
−## Vane-type waterflow switches shall be listed and provided with an adjustable retard, and the retard shall be set to delay the alarm signal to avoid false alarms from supply pressure surges.
−
−## The waterflow switch retard shall be set between 20 and 30 seconds unless the system standard or the AHJ directs otherwise, within the device's adjustable range of 0 to 90 seconds.
−
−## Setting the retard too short causes nuisance alarms from normal pressure transients, while setting it too long delays a real alarm; the 20 to 30 second band balances both for most systems. {note}
−
```datasheet
label: Waterflow Detection Device
…4 unchanged lines
default: "Vane-type waterflow switch"
```
+## A vane (paddle) switch inserts into the flowing pipe and signals on sustained flow, while a pressure switch senses the pressure rise behind the alarm valve clapper; the choice depends on system size, pipe arrangement, and AHJ preference. {note}
+## A waterflow alarm device shall be provided and wired to the fire alarm control panel to initiate an alarm on system flow.
+
+## Vane-type waterflow switches shall be listed and provided with an adjustable retard, and the retard shall be set to delay the alarm signal to avoid false alarms from supply pressure surges.
+
+## The waterflow switch retard shall be set between 20 and 30 seconds unless the system standard or the AHJ directs otherwise, within the device's adjustable range of 0 to 90 seconds.
+
```datasheet
label: Waterflow Switch Retard Setting
…6 unchanged lines
```
+## Setting the retard too short causes nuisance alarms from normal pressure transients, while setting it too long delays a real alarm; the 20 to 30 second band balances both for most systems. {note}
+
# Fire Department Connection {toc}
…96 unchanged lines
## Pipe hangers and supports shall be listed for fire protection service, shall attach to the building structure or to listed trapeze assemblies, and shall be spaced in accordance with NFPA 13. {note}
−## Fire protection piping carries the weight of water plus a substantial point load from the seismic and surge forces of system operation; hangers must reach structural members, and a hanger spacing called out without confirming beam and joist locations causes field conflicts. {note}
+## Fire protection piping carries the weight of water plus a substantial point load from the seismic and surge forces of system operation; hangers must reach structural members, and a hanger spacing called out without confirming beam and joist locations causes field conflicts.
## Hangers shall be of a material compatible with the pipe to avoid galvanic corrosion, with non-ferrous or coated hangers used on copper tube.
…174 unchanged lines
# Warranty {toc}
−## The Contractor shall warrant the installed fire protection piping, valves, and specialties against defects in materials and workmanship for the project warranty period. {note}
+## The Contractor shall warrant the installed fire protection piping, valves, and specialties against defects in materials and workmanship for the project warranty period.
## The Contractor shall warrant the work against leakage, joint failure, and device malfunction for a period of not less than one year from the date of substantial completion, unless a longer period is required by the contract.
…24 unchanged lines
- "Special service tools"
```