What pressure is used for the test?

The standard is 200 PSI held for 2 hours. If the maximum pressure is over 150 psi, the test pressure is 50 psi above the maximum pressure.

How is "pass" determined?

The system must hold test pressure for 2 hours with no observable leaks and no pressure drop beyond allowable limits. Our technicians document starting pressure, hold-period readings, and any anomalies observed.

Can you test after a repair without testing the whole system?

Yes — when repairs involve isolated sections, the affected portion can typically be tested independently. We coordinate with your fire protection contractor to determine the appropriate scope.

Is a test report included?

FLOW documents pressure readings, test duration, observations, and results. FLOW produces and sends the report for AHJ or insurance submission.

Standpipe Hydrostatic Testing: 5-Year, 200 PSI

A hydrostatic pressure test proves your fire suppression piping can safely hold pressure well above normal operating conditions. It is the foundational acceptance test for new fire sprinkler and standpipe installations, and a mandated part of ongoing NFPA 25 system maintenance.

What Is a Standpipe Hydrostatic Test?

A standpipe hydrostatic test fills the standpipe piping with water, pressurizes it to at least 200 psi, and holds that pressure for 2 hours to prove the pipe, fittings, and joints do not leak. NFPA 25 (2020 ed.) calls for it every 5 years on manual standpipes and semiautomatic dry standpipes, including the piping in the fire department connection. Where the maximum system pressure exceeds 150 psi, the test is run at 50 psi above that maximum.

Automatic standpipes are proven differently: NFPA 25 (2020 ed.) calls for a 5-year flow test on them, which is a separate service (standpipe flow tests). Confirm your AHJ's adopted edition and any local amendments before scheduling.

What Is a Hydrostatic Pressure Test?

A hydrostatic test pressurizes the fire suppression piping to 200 PSI (or 50 psi above the maximum pressure, when the maximum is over 150 psi) and holds that pressure for a minimum of 2 hours. During the hold period, the system is inspected for leaks, pressure loss, and joint integrity.

This is NFPA's primary method of verifying that piping, fittings, and joints are sound — before the system is placed in service.

When Is Hydrostatic Testing Required?

New system installations prior to commissioning (NFPA 13 and NFPA 14 acceptance test)
After significant piping modifications or additions
Following repairs that involve cutting, welding, or replacing piping
Every 5 years for manual standpipes and semiautomatic dry standpipes, including fire department connection piping (NFPA 25, 2020 ed.)
Private fire service mains (NFPA 24/25): at the interval the edition your AHJ enforces requires; confirm in your copy
When required by the Authority Having Jurisdiction or insurance carrier

Why It Matters

Unlike a flow test, a hydrostatic test isolates one question: is the piping physically sound? A system that leaks under static pressure will absolutely fail under dynamic fire conditions. Hydrostatic testing catches weak joints, micro-fractures, and defective fittings before they cause water damage — or worse, system failure during a fire.

What to Expect During the Test

1
Isolation: system is valved off and filled with water; air is bled from high points.
2
Pressurization: system slowly brought up to 200 PSI using calibrated test pump.
3
Hold period: 2 hours minimum at test pressure, with continuous monitoring for pressure drop and leaks.
4
Inspection & documentation: visual inspection of joints, fittings, and valves; full test report issued.

Code References

NFPA 13

Standard for the Installation of Sprinkler Systems — hydrostatic test requirements for new installations.

NFPA 14

Standard for Standpipes — acceptance testing for standpipe piping at 200 PSI.

NFPA 24

Standard for Private Fire Service Mains — hydrostatic testing of underground supply piping.

NFPA 25

Ongoing inspection, testing, and maintenance requirements including 5-year interval testing.

Frequently Asked Questions

It is a pressure test of the standpipe piping: the system is filled with water, pressurized to at least 200 psi, and held for 2 hours while it is checked for leaks. NFPA 25 (2020 ed.) calls for it every 5 years on manual standpipes and semiautomatic dry standpipes, including fire department connection piping. Where the maximum system pressure exceeds 150 psi, the test is run at 50 psi above that maximum. Confirm your AHJ's adopted edition.

Schedule a Pressure Test

Hydrostatic Pressure Testing for Standpipes & Fire Suppression Systems in MD, VA, DC, NC & SC