202-11 Relay Pumping

According to the formula, how many pumpers are needed if the distance is 1800 feet?

4

3 (correct)

2

5

What is the initial pressure placed on the discharge line to the next pumper in the relay?

100 PSI

50 PSI (correct)

75 PSI

25 PSI

What is the minimum compound gauge pressure that the pump operator of the source pumper should maintain?

5 PSI (correct)

20 PSI

10 PSI

15 PSI

What is the minimum intake pressure on other intermediate relay pumpers?

20 PSI Signup and view all the answers

According to the text, what is the maximum stretch between pumpers in a relay for a 5" line company?

800' to 900' Signup and view all the answers

What is the approximate capacity of the pumps in the relay for a 5" line company?

1500gpm Signup and view all the answers

What is the maximum discharge pressure for 5" line companies in a relay?

175 PSI Signup and view all the answers

What should fireground commanders and company officers be aware of when deciding which master streams can be utilized?

The limitations of the particular relay involved Signup and view all the answers

Which type of pumper is allowed to be used as the fireground pumper in a relay operation?

Specialized apparatus, such as a Squrt or Foam pumper Signup and view all the answers

What is the initial pressure placed on the discharge lines at the beginning of a relay operation?

50 PSI Signup and view all the answers

What is the maximum discharge pressure of a 5" line relay?

175 PSI Signup and view all the answers

What is the minimum compound gauge reading that the source pumper should maintain?

5 PSI Signup and view all the answers

Which type of hydrant is recommended to be connected to the source pumper in a relay operation?

Green top hydrant Signup and view all the answers

What is the recommended stretch between relay pumpers in a relay operation?

500 to 900 feet Signup and view all the answers

What is the purpose of the dump/discharge line in a relay operation?

To maintain the flow of water in case of emergency shutdown Signup and view all the answers

What is the guideline for setting up a relay in terms of city blocks coverage?

One relay pumper can cover 1 to 1 ½ city blocks Signup and view all the answers

Which one of the following best defines relay pumping?

Using multiple pumpers to move water over a long distance by operating them in series Signup and view all the answers

What is the purpose of a relay procedure in firefighting?

To minimize confusion and ensure an adequate water supply Signup and view all the answers

When are relaying operations typically required?

When the distance exceeds 1000 feet Signup and view all the answers

In which situations might a relay operation be necessary in the city of Philadelphia?

An extra-alarm fire where the residual water supply is exhausted Signup and view all the answers