Laserfiche WebLink
ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />until surfaces touch, then push and tum at the same time <br />until a lock is achieved. Only a quarter turn to a half turn is <br />usually needed. On 3" and 4" (75 and 100 mm) diameter <br />Red Thread IIA fittings, pushing and turning to lock the <br />joint is impractical. A driving force must be used. <br />If the adhesive or the pipe surfaces <br />are cool, push and hold for a few <br />seconds to allow time for the ad- <br />hesive to start flowing out of the <br />tapered joint. Apply the push -turn <br />method after this period. If mechani- <br />cal force is needed, use a rubber, <br />mallet against a wooden block to <br />drive the joint together. Do not hit the <br />fitting directly with a hammerlmallet <br />as damage may occur. <br />When the adhesive starts squeezing mom, <br />out of the joint, use stronger blows. Proper pipe alignment is <br />important. Maintain back pressure against previously assem- <br />bled joints to avoid shaking them loose. After the joint has <br />started to make up, hit until no further engagement can be <br />seen at the joint. When engagement stops, the joint is locked. <br />Always check previous bonded joints to ensure they have not <br />backed out. <br />Do not use force directly on a spigot. <br />• Check lock up by moving free end of pipe in an up-and- <br />down or side-to-side motion. The movement must be suf- <br />ficient to move the joint being checked. No movement <br />between the joint components should be visible in the <br />joint. If any movement exists, the joint is not locked up <br />and the joint assembly procedure must be repeated. <br />25 <br />