scope:

This standard encompasses the design and performance requirements for flexible fire pump couplings and flexible connecting shafts used in fire pump service that are designed and installed in accordance with FM Global Property Loss Prevention Data Sheets.

This standard encompasses flexible fire pump couplings and flexible connecting shafts for use with operating speeds at or below 3600 rpm.

This standard encompasses the design and performance requirements for flexible fire pump couplings of 30 hp through 1000 hp load rating, and for flexible connecting shaft diameters of up to 4 inch nominal size used in fire pump service.

Flexible couplings and flexible connecting shafts designed for other rated capacities shall be evaluated on a case-by-case basis.

Purpose

This standard states Approval criteria for flexible fire pump couplings and flexible connecting (drive) shafts which provide power transmission from diesel engines or electric motors to fire pumps that supply water to fire protection systems. These flexible fire pump couplings and flexible connecting shafts must have an extended service life, throughout which they must be capable of operating reliably at rated power and speeds during emergency fire incidents, despite being idle for extended periods. The purpose of the flexible coupling and flexible connecting shafts is to compensate for temperature changes and to permit end movement of the shafts without interference with each other while transmitting power from the driver to the pump.

Approval criteria include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.

Approval standards are intended to verify that the product described shall meet stated conditions of performance, safety, and quality useful to the ends of property conservation.