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v <br />Piping system layout Supporting valves, accessories and vent lines <br />(cont.) Do not use fiberglass pipe to support the weight of heavy items in a line such as valves, <br />strainers and steel vent riser pipes. Provide separate supports for valves and accessories. <br />Fig. 6-3. Support risers by attaching <br />them directly to structure walls. <br />r------------- <br />Never use metal swing joints. 1 <br />L ------------J <br />Fig. 6-4. Use flexible connectors to <br />connect fiberglass pipe to tanks, turbine <br />outlets at tanks and to shear valves at <br />dispensers. A 4 -ft length of fiberglass <br />pipe (dogleg) is allowable per <br />API Specification 1615 in lieu <br />of flexible connector. <br />E. <br />Permanent p <br />structure <br />0 <br />Steel pipe clamp (typ) <br />Steel riser <br />Dualoy 3000/L fiberglass pipe <br />Precise alignment and make-up <br />The matched taper bell and spigot joint does not always result in a precise and <br />predictable insertion depth. This variation results from: <br />• Manufacturing tolerances in the bell <br />• Differences in length of tapers prepared on the jobsite <br />• Difference of insertion depth when dry fit and after adhesive has been applied. <br />