By American Water Works Association.; American National Standards Institute
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Extra info for AWWA standard for rubber-seated butterfly valves
3 Provision should be made to stop line flow and isolate the valve from line pressure prior to performing any corrective maintenance. 4 After completing repairs, cycle the valve through one complete operating cycle and, after line pressure has been restored, inspect for leakage. 5 If major repairs require the removal of the valve for repair, be sure to notify interested parties in the water department and fire department that the valve and line are out of service. On completion of repair and reinstallation, notify the same personnel of the return of the valve and line to service.
SECTION 5: VERIFICATION Sec. 1 Performance tests. To demonstrate that the valve and actuator are workable, valves having direct-mounted actuators, except those provided with extension shafts of more than 36 in. (900 mm), shall be shop operated three times from the fully closed to the fully opened position and the reverse under no-flow conditions. 2 Leakage tests. , those furnished with torque tubes or floor stands) or for valves with actuators mounted on extension shafts of more than 36 in. (900 mm), each valve shall be shop tested for leaks in the closed position.
Epoxy coatings are more likely to result in a holiday-free surface. If severe service conditions exist, the purchaser should consider an epoxy coating. Special holiday testing, as specified in ANSI/AWWA C550 can also be required if conditions justify the added expense. 2 When the valves will be installed in an aboveground location to be subsequently field coated, the exterior of each valve, except flange faces, shall be shop coated with a suitable metal primer to a dry-film thickness of not less than 3 mil.
AWWA standard for rubber-seated butterfly valves by American Water Works Association.; American National Standards Institute