scope:

This standard addresses the test methods and performance requirements for water hammer arresters.

Description

This standard applies only to those devices classified as water hammer arresters having a permanently sealed cushion of water or gas isolated from the water way, and designed to provide continuous protection, without maintenance, against detrimental surge pressures within the water distribution system.

Size Range

The size of water hammer arresters shall be within the range from Type AA which are used for "point of use" residential appliance applications to Types A to F which are used in applications as defined within Table 1 of this standard.

Pressures

Hydrostatic Pressure

Water hammer arresters shall be designed to withstand a maximum rated pressure of 1034 kPa (150 p.s.i.).

Operating Pressure

Water hammer arresters shall be designed for a flowing pressure up to 414 kPa (60 p.s.i.).

Temperature Range

Water hammer arresters shall be capable of performing in the temperature range from 0.55 degrees C (33 degrees F) to 82 degrees C (180 degrees F).

Application

Water hammer arresters are installed on water distribution system piping to prevent over pressures within water distribution systems, thereby prolonging the service life of valves, piping, fittings, trim, equipment, appliances, appurtenances, and other devices which are part of the distribution system; and to eliminate noise.