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Diesel Engine Drive (NFPA 20 Chapter 11)

Diesel engine driven fire pump set are used in conjunction with, or in addition to, electric motor driven fire pumps as the best combination for reliable pumping systems.

When combined with on-site water storage-such as a ground storage tank, an underground reservoir, a tower, a pond, or a well – a diesel driven fire pump is completely self-contained.

Properly designed and installed diesel-driven fire pump units can service extended periods in the absence of ac power.

Listing:

11.2.1 Listing. Engines shall be listed for fire pump service.

 

Selection:

NFPA 20 Requires that the engine shall have HP rating listed by a testing laboratory (UL/FM).

De-rating conditions:

 

11.2.2.4* A deduction of 3 percent from engine horsepower rating at standard SAE conditions shall be made for each 1000 ft (300 m) of altitude above 300 ft (91 m).

 

11.2.2.5* A deduction of 1 percent from engine horsepower rating as corrected to standard SAE conditions shall be made for every 10°F (5.6°C) above 77°F (25°C) ambient temperature.

 

 

Minimum Instrumentation and control Shall include:

1- Adjustable Speed Governor

2- Over speed shutdown device set approximately 20 % above rated diesel engine

3- Tachometer with hour meter

4- Oil pressure gauge and temperature gauge