According to NFPA standards, which type of fire pump assembly is not accepted?

The reasoning behind the acceptance of various types of fire pump assemblies, as outlined by NFPA standards, centers on their suitability for reliable and efficient performance in fire suppression systems. An electric motor is commonly used for its efficiency and reliability, especially in fixed installations. Petrol engines also find acceptance, primarily due to their portability and ability to function in situations where electrical connections may be impractical.

In contrast, the steam pump is not recognized as a standard fire pump assembly under NFPA guidelines. This is largely due to their outdated technology and lower efficiency, as well as concerns about safety and operational consistency. Steam pumps are not commonly used in modern fire protection systems because they require significant maintenance, have slower response times, and are less efficient compared to modern electric or internal combustion engines. Integrating such a system could pose risks and complications, which is why it does not align with the current standards set by the NFPA for fire pump assemblies.