INSTALL_1992 - Laserfiche WebLink

Home Browse Search

NPT threaded connections Thread preparation Inspect the threads of the fiberglass adapters. Do not use couplings with damaged threads. Before joining a threaded fiberglass fitting to a steel fitting,always inspect the . steel threads for burrs. Remove any burrs by making up a mating steel fitting to the burred threads. Unmake this fitting and re-inspect the threads before using.Threads must be clean and dry before applying thread-sealing compound. Always dry fit the fiberglass threads and the steel threads without sealing compound. It should be possible to dry fit the threads as shown in the following table. If the proper number of threads do not make up,select a new steel fitting and repeat the process. Best results will be obtained using a non-hardening,solvent-free Teflon® based thread sealant such as Jomar® Seal"The Heavyweight." Non-hardening thread sealants such as RectorSeals No.5 have also been used successfully. Apply the thread-sealing compound to the male and female threads of the adapter or fitting. Insert the fiberglass adapter into the steel coupling and hand tighten.The parts should make up the number of threads shown in table below. If they do not, a proper seal may not be effected when tightened. Making the joint The threaded joint should be made up prior to bonding to the pipe.To complete the joint, a wrench should be used to get full make-up.Standard pipe wrenches can be used with care on the adapters, but do not overtighten. Thread Make-Up Nominal Threads to Additional Pipe Size Dry Fit Threads to Seal (i n) (mm) • 11/2 40 4-5 3 2 50 4.5 3 3 80 5-6 2 4 100 6.7 2 6 150 7.8 2 Teflon is a registered trademark of the E.f.du Pont de Nemours&Co.,Inc. Joiner isa trademark of✓omar RectorSeatis a registered trademark of the RectorSeat Corporation Pipe installation Bedding, backfilling and covering Grade the trench bottom to provide firm, even support for the bottom of the pipe and to provide an even slope back to the tanks.The trench bottom must be free of hard or sharp objects that could damage the pipe. Never leave empty adhesive cans, bottles, or trash in the ditch. Burial depth A minimum of 18 inches(50 cm)of select backfill(sand, pea gravel or crushed stone[maximum size 1/2 inch or 12 mm]) is recommended between the top of the pipe and the ground surface to minimize the likelihood of damaging the pipe. In cases where space does not permit 18 inches of cover, use the following recommendations as a guide: • When the pavement is reinforced concrete at least 4 inches(100 mm)thick, a minimum of 4 inches of select backfill is recommended between the top of the pipe and the bottom of the concrete. • When the pavement is an asphalt mix at least 2 inches(50 mm)thick,a • minimum of 8 inches(200 mm)of select backfill is recommended between • the top of the pipe and the bottom of the pavement. • Caution:Vehicles should not be allowed over backfilled trenches prior to concreting or asphalting as they may cause damage to the pipe. 10