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JL: Y 14 :,,11 <br />ENVIRONMENTAL HEALTH <br />DEPARTIM7-N7 <br />Air Test Procedures and Safety Precautions <br />TESTING WITH AIR OR GAS IS EXTREMELY DANGEROUS. <br />IF YOU CONTEMPLATE USING AIR OR GAS IN SPITE OF <br />THE WARNING OR IF YOU WILL BE PRESSURIZING HIGHER <br />THAN 11/2 TIMES THE LOWEST RATED ELEMENT OF THE <br />SYSTEM, REVIEW ALL SAFETY PRECAUTIONS BEFORE <br />STARTING THE TEST. <br />If testing with air or gas is required or requested to be per- <br />formed, the following testing procedures and precautions <br />must be followed. EXERCISE DUE CARE IN INSTALLING AND <br />TESTING THE PIPING SYSTEM. <br />• Visually inspect all bonded joints for proper insertion and <br />adhesive cure prior to pressurizing the piping system. A <br />gap between the adhesive bead and the fitting shoulder <br />indicates the possibility that joint pull-out exists. Make <br />any necessary repairs before pressurizing the piping sys- <br />tem. <br />• Check the integrity of the joints by pressurizing the sys- <br />tem to 25 psig (0.172 MPa) and holding the pressure for <br />a minimum of one minute. Soap all joints to test for leaks. <br />• If there are no leaks, raise the line pressure in the sys- <br />tem to a maximum of 50 psig (0.345 MPa). Again, hold <br />the pressure for a least one minute and soap all joints to <br />check for leaks. <br />• As serious personal injury or death can result, the pipe <br />inspector should take precautions for his/her personal <br />safety and protection against flying debris and also <br />against the whipping action of the pipe that can result <br />from the sudden release of stored energy. Adequate per- <br />sonal protective equipment should be used. <br />• Avoid direct contact with the piping system while it is <br />pressurized during testing until the actual checking of the <br />joints for leaks. Absolutely no one should be in the trench <br />while the pressure in the pipe is being increased. Notify <br />all site personnel before beginning the testing procedure. <br />• Do not straddle the pipe during testing or while checking <br />the piping system for possible leaks. Stand to the side <br />of the pipe. <br />• While the pipe is being checked for leaks, do not stand at <br />the end of the piping system or where it changes direc- <br />tions. <br />32 <br />