Abstract
The study's goal is to evaluate the magnitude of surge pressure that might occur in pipes that are 4-16 inches in size. The study was performed for the Washington Suburban Sanitary Commission (WSSC) service area to determine how the surge pressure might affect the current WSSC criteria for surge pressure allowances for thrust restraint design. The study has found that potentially severe surge pressures could be caused by filling of new or repaired distribution main with no air valves, rapid closing of fire hydrants, and operation of water pump on a fire truck during fire resque. Provided is a recommendation that the current standard surge pressure allowances should remain in use for standard blocking design of small diameter watermain.
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