HR OPS PRD V.S PRV 41-49

Play an AI-generated podcast conversation about this lesson

What is the primary objective of NFPA 101?

Identifying and removing various types of pressure restricting devices

Defining the construction standards for high-rise buildings

Ensuring the safety of occupants and first responders in high-rise buildings (correct)

Regulating the pressure reducing valves in high-rise buildings

What is the main purpose of NFPA 14?

Defining the construction standards for high-rise buildings

Regulating the pressure reducing valves in high-rise buildings

Understanding and explaining the differences between PRDs and PRVs (correct)

Identifying and adjusting factory pre-set non-adjustable PRVs

In the context of high-rise operations, why is it important to identify factory pre-set non-adjustable PRVs early?

To understand what tactics to use when a factory pre-set non-adjustable PRV does not provide adequate pressure

To ensure the safety of occupants and first responders in high-rise buildings (correct)

To identify and remove various types of pressure restricting devices

To regulate the pressure reducing valves in high-rise buildings

What is the significance of understanding the differences between PRDs and PRVs for firefighters operating in high-rise environments?

To operate safely and effectively in high-rise buildings Signup and view all the answers

Why do firefighters need to know how to identify and adjust different types of PRVs in high-rise environments?

To be able to operate safely and effectively in high-rise buildings Signup and view all the answers

What tools are needed to adjust various types of PRVs in high-rise environments?

Be able to identify and adjust a Giacomini PRV Signup and view all the answers

What is the height threshold for a building to be considered a high-rise according to NFPA 101?

Greater than 75 feet Signup and view all the answers

For buildings constructed pre-1993, what is the required residual pressure at the most remote outlet from the fire pump according to NFPA 14?

65 PSI Signup and view all the answers

For buildings constructed post-1993, what is the required residual pressure at the most remote outlet from the fire pump according to NFPA 14?

100 PSI Signup and view all the answers

What is required when the pressure at the outlet of a standpipe system is less than 100 PSI according to NFPA 14?

No pressure reduction is required Signup and view all the answers

What is required when the pressure at the outlet of a standpipe system is over 175 PSI according to NFPA 14?

Pressure reducing valves are required Signup and view all the answers

What characteristic distinguishes pressure restricting devices (PRDs) from pressure reducing valves (PRVs)?

PRVs reduce pressure only in flowing conditions Signup and view all the answers

Which type of valve serves as a one-way check valve that does not allow water to be back-fed into the standpipe?

Pressure reducing valve (PRV) Signup and view all the answers

What is an indication that a valve is not a pressure reducing valve?

A smooth stem inside the valve Signup and view all the answers

'It is especially important for the pump operator of the FDC engine to know what pressure the fire pump is providing to the building' - What could happen if the pump operator supplies a lower pressure than the fire pump did?

'The PRVs will not allow adequate pressure past them' Signup and view all the answers

'In buildings that have PRVs on the standpipes' - What is especially important for the pump operator of the FDC engine to determine if the fire pump fails?

'The pressure needed at the top floor' Signup and view all the answers

Why should FDC engine pump operators supply the building with the pressure needed at the top floor if the fire pump fails?

To provide adequate pressure past the PRVs on the fire floor Signup and view all the answers

What potential issue may arise if the FDC engine pump operator supplies a lower pressure than what would be needed at the top floor in case of fire pump failure?

The fire attack teams may face inadequate water pressure Signup and view all the answers

What is the main purpose of a pressure-reducing valve?

To reduce pressure in flowing conditions Signup and view all the answers

How is the removable clip design different from the adjustable pin design?

The adjustable pin design requires an Allen wrench to remove, while the removable clip design can be pulled out Signup and view all the answers

What potential issue is associated with the orifice plate in a standpipe valve?

It may cause damage to the inner lining of hoses Signup and view all the answers

What is the main characteristic of a mechanical pressure restricting device?

It has overlapping holes that restrict water flow Signup and view all the answers

How can a pressure-reducing valve be identified as non-adjustable?

By having a large ring at the top of the valve body Signup and view all the answers

What is the purpose of field adjustment for a standpipe valve?

To overcome valve installation or maintenance problems that cause inadequate pressure at the valve outlet Signup and view all the answers

What is the tool required for adjustment of a standpipe valve?

Metal adjustment rod Signup and view all the answers

What does an exposed adjustment barrel indicate about a standpipe valve?

It suggests that the valve is field adjustable Signup and view all the answers

'Factory pre-set valves leave much room for human error' implies that:

Valves need to be designed and assembled properly for correct operation Signup and view all the answers

What does rotating the adjustment rod clockwise do?

Increases standpipe outlet pressure Signup and view all the answers

What does a smooth stem inside a standpipe valve indicate?

Non-adjustable pressure-reducing valve Signup and view all the answers

What tools are required for field adjustment of the Large field adjustable valve with adjustment barrel covered by Lexan anti-tamper shield?

T-handle pin and hex security wrench adjustment rod Signup and view all the answers

What is the purpose of field adjustment for the Large valve with a long stem?

To overcome valve installation or maintenance problems causing inadequate pressure at the valve outlet Signup and view all the answers

What is a weak point of the Lexan shield according to the text?

The hole in the adjustment barrel Signup and view all the answers

How much force is required for rotation of the adjustment barrel for the Large field adjustable valve?

Approximately 15 pounds of force Signup and view all the answers

What tends to make firefighters and Incident Commanders most uncomfortable with the Zurn pressure reducing valve?

The need to remove the bonnet for field adjustment Signup and view all the answers

What can firefighters use to approximate the outlet pressure under residual flow conditions?

Numbers provided in the text Signup and view all the answers

What can be inserted into the exposed hole in the adjustment barrel for adjustment of the Large field adjustable valve?

$T-handle pin and hex security wrench$ Signup and view all the answers

Which tool is utilized to loosen the upper coupling nut for field adjustment of the Large valve with a long stem?

$Pipe wrench$ Signup and view all the answers

What must be removed for field adjustment of the Zurn pressure reducing valve?

$Hand wheel assembly (bonnet)$ Signup and view all the answers

How is the outlet pressure of the Large valve with a long stem increased or decreased during field adjustment?

$By tightening or loosening the adjustment nut$ Signup and view all the answers

$What kind of questions can be answered by viewing Brass Tacks and Hard Facts video on Urfa valve use and adjustment?$

Questions on adjusting Large field adjustable valve. Signup and view all the answers

What should be used to increase or decrease pressure during field adjustment for Large field adjustable valve?

T-handle pin and hex security wrench adjustment rod. Signup and view all the answers