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9 NPT threaded Thread preparation connections Inspect threads on fiberglass adapters and threaded bushings. Do not use if threads are damaged. • Inspect threads on steel fittings for burrs. • Remove burrs from steel fittings by making up to mating steel threads.Unmake the steel fitting and reinspect. • Always dry fit fiberglass and steel threads without sealing compound.It should be r———————————, possible to dry fit the threads as shown in the following table.If the proper On bell x female adapters,use I number of threads cannot be made up,select a new steel fitting. pipe wrench over threaded portion only.On bell x male Making the joint adapters,use pipe wrench on steel nipple whenever possible. Threads must be clean and dry before applying thread-sealing compound. • Use a nonhardening,solvent-free Teflon based thread sealant such as Jomar L———————————J Seal"The Heavyweight"or Gasoila Soft Set pipe sealant. r___________, Apply sealing compound to male and female threads. I In general,threaded connections I • Hand tighten the joint,then should be made up before I use a wrench to get full adhesive-bonded joints to I make-up.Standard pipe Threads to Dry Fit and to Seal minimize the possibility of I wrenches can be used with Nominal care on fiber lass ada ters. damage to bonded joints caused I g p Pipe Size Threads to Additional by torquing the threaded Do not overtighten. (In) (mm) Dry D Fit Threads to Seal I connections.However,when I The parts should make up 11/2 40 4-5 3 the number of threads 2 50 4-5 3 installing molded threaded shown in the table above. 3 80 5-6 3 bushings(tapered major nominal i Otherwise,a proper seal 4 100 6-7 2 pipe size x threaded minor I may not be effected when nominal pipe size)make the I tightened. tapered bonded joint first and I Isolating flex connectors at the shear valve I allow it to cure before making up I the threaded joint.This order of I When flex connectors are directly buried at the dispenser,regulations frequently require joint make-up will prevent I that they be cathodically protected and provisions be made to avoid stray current damage to the bushing—electrolysis and corrosion.In such cases the flex connector must be electrically isolated L___________J from the shear valve and from other metallic components in the system.Experience has shown that nylon isolation adapters do not perform well inasmuch as the poor r————————————I mechanical strength of the material results in creep or thread deformation with Never use a pipe wrench directly I subsequent leakage. on the pipe:wrench up only on I Ameron manufactures a 11/2 NPT female x 11/2 NPT male fiberglass-reinforced isolation adapters. I adapter which may be mounted between the flex connector and the shear valve. Follow L___________J the same general installation procedures as with other NPT threaded fittings.After applying the sealing compound,hand tighten the adapter.Final make-up requires 11/2 to 2 additional turns. 9 Shearvalve L�11/2 NPT female F 27/8—� I 1'/2 NPT Dualoy isolation /y male adapter Fig.9-1.The Ameron fiberglass- reinforced isolation adapter is mounted 13/a between the flex connector and the 21/4 shear valve. SS flex connector Lr--11/2 NPT male both ends 11/2 NPT (by others) female