STANDPIPE & PRV TESTING

TESTING APPLICATIONS: STANDPIPE & PRV TESTING

A standpipe is the vertical piping that connects fire sprinkler systems and hose stations between multiple floors. It is common to see standpipes in stairwells of high-rise buildings. A rooftop standpipe test verifies the water supply, pump and piping at the topmost part of the system.

In the past, the only way to perform rooftop standpipe tests was with playpipes and hand-held pitots. Safely securing playpipes and controlling discharge water to avoid interfering with pedestrian and vehicle traffic was a significant challenge, typically requiring that testing be in the early morning hours. The introduction of the Hose Monster® line of equipment changed all that. The Hose Monster neutralizes the dangerous thrust and controls discharge water on the rooftop while minimizing hazards to pedestrians and property below. Flow-rate is measured with FM Approved accuracy.

In some cases, discharging the water can be a challenge since you may be in a stairwell or basement. The In-Line Pitotless Nozzle™ can take flow-rate measurements at the valve, allowing you to run hose or piping to a drain or down several flights of stairs.

HOW OFTEN DO I TEST A STANDPIPE OR PRV?

Every five years. According to NFPA 25, “A flow test shall be conducted every five years at the hydraulically most remote hose connections of each zone of an automatic standpipe system to verify the water supply still provides the design pressure at the required flows.”

WHERE DO I FIND MORE INFORMATION ON STANDPIPES & PRV’S?

  • NFPA 25, Chapter 6 — Inspection, testing and maintenance of standpipe and hose systems
  • NFPA 14 — Installation of standpipes and hose systems

What equipment do I need?

  • In-line Pitotless Nozzle Bundle, 2.5″ Connection

    This bundle includes all three sizes of In-line Pitotless Nozzles, capable of measuring 80 GPM to 1380 GPM.

  • In-line Pitotless Nozzle, 2.5″ Connection

    Use the In-line Pitotless Nozzle™ for flow testing standpipes and PRV’s from 2.5” diameter connections such as standpipes or valves. The device is perfect for measuring flow-rates where job conditions do not allow water discharge such as stairwells or rooftops. Select either a 2″, 1 ¾”, or 1 ⅛” Pitotless Nozzle, based on your desired flow range.

  • In-line Pitotless Nozzle, 1.5″ Connection

    Use the 1 ½” Inline Pitotless Nozzle™ for flow testing from 1.5” diameter connections such as hose cabinets, standpipes, or valves. Measures flows from 45 to 301 GPM.

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