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Automatic Air Release Valve – Section 6.3.3
Presence of Air in the fire pump can affect the pump performance, so it is prudent to have method of releasing that air, should it develop.
188.8.131.52 Unless the requirements of 184.108.40.206 are met, pumps that are automatically controlled shall be provided with a listed float-operated air release valve having a nominal 0.50 in. (12.7 mm) minimum diameter discharged to atmosphere.
220.127.116.11 The requirements of 18.104.22.168 shall not apply to overhung impeller–type pumps with top centerline discharge or that are vertically mounted to naturally vent the air.