Free S-13 Pressure Reducing Valves (PRVs) Questions and Answers

Question 1

What is the primary function of a Pressure Reducing Valve (PRV) in a high-rise standpipe system?

Accepted Answer

To reduce downstream water pressure to a safe level for hose operations.

Answer

In tall buildings, gravity and powerful fire pumps create extremely high water pressure. A PRV is an essential safety device that automatically reduces this pressure to a safe and predetermined level at the hose outlet, allowing firefighters to handle the hoseline effectively and safely.

Question 2

During a visual inspection of a PRV, what condition would require immediate notification to a licensed contractor?

Accepted Answer

There is a constant drip or leak from the valve body.

Answer

Any leak from the valve body, stem, or connections is a sign of failure and a critical deficiency. An S-13 holder is not permitted to repair PRVs; therefore, a Master Fire Suppression Piping Contractor must be notified immediately to perform the necessary repairs.

Question 3

What is the difference between a 'factory-set' PRV and a 'field-adjustable' PRV?

Accepted Answer

Factory-set PRVs cannot be adjusted on-site, while field-adjustable ones can.

Answer

A factory-set PRV is calibrated to a specific, non-changeable pressure at the time of manufacture. A field-adjustable PRV is designed to be set to a precise pressure on-site by a qualified technician to meet the specific requirements of its location within the building's system.

Question 4

According to NFPA 25, which is referenced by the FDNY, how often must PRVs undergo a full flow test?

Accepted Answer

Every 5 years

Answer

While PRVs require annual static pressure checks, a full flow test is required every five years. This comprehensive test ensures the valve will open, close, and maintain the correct pressure under the demanding conditions of a fire, and it must be performed by a qualified contractor.

Question 5

An S-13 holder discovers that the adjustment cap on a field-adjustable PRV is missing and the stem appears to have been tampered with. What is the correct action?

Accepted Answer

Log the deficiency and immediately notify a Master Fire Suppression Piping Contractor.

Answer

The S-13 holder's responsibility is to identify and report such a critical issue. Adjusting or repairing PRVs is outside their scope of practice and requires a licensed professional. The finding must be logged, and a Master Fire Suppression Piping Contractor must be called to inspect, test, and properly set the valve.

S-13 - Certificate of Fitness for Citywide Standpipe Systems Practice Test

S-13 - Certificate of Fitness for Citywide Standpipe Systems Practice Test

Free S-13 Pressure Reducing Valves (PRVs) Questions and Answers