Blow Down and Purging Clause Samples

Blow Down and Purging. No gas shall be admitted into any completed or partially completed construction prior to receiving an acceptable pressure test and/or before notifying and receiving the approval of the Engineer. After pressure testing is completed, and under the direction and in the presence of the Engineer, the Contractor shall admit gas into the line in sufficient quantities to clear air, dust, and other foreign matter from the pipe, after which all valves shall be closed and gas pressure maintained in the line continuously. The Owner shall furnish the gas necessary for this operation. Purging of polyethylene pipe shall be done through a metallic vent stack located at the end of the main, which extends to at least 8 feet above ground level, and is equipped with valving where necessary for safe control. Vent stacks shall be located so that gas may be discharged safely taking into consideration nearby buildings, overhead power lines and other sources of ignition. All smoking and open flames shall be prohibited in the area during the purging and blowing operation. Vent stacks shall be effectively grounded to prevent build-up of static electricity. Before putting gas in the main the vent shall be carefully braced and blocked as necessary to prevent a blow off. Gas should be admitted into the main at the moderately rapid flow to minimize mixing of the gas and air. However, high velocities which could case a spark by moving solid particles, such as rocks, should be avoided.
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Related to Blow Down and Purging

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