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0 <br /> NPT threaded Thread preparation <br /> connections • Inspect threads on fiberglass adapters and threaded bushings. <br /> Do not use if threads are damaged. <br /> • Inspect threads on steel fittings for burrs. <br /> • Remove burrs from steel fittings by making up to mating steel threads.Unmake the <br /> steel fitting and reinspect. <br /> r——————————————) • Always dry fit fiberglass and steel threads without sealing compound.It should be <br /> possible to dry fit the threads as shown in the following table.If the proper number <br /> In general,threaded connections f of threads cannot be made up,select a new steel fitting. <br /> 1 should be made up before adhesive- 1 <br /> 1 bonded joints to minimize the 1 Making the joint <br /> 1 possibility of damage to bonded joints 1 Threads must be clean and dry before applying thread-sealing compound. <br /> 1 caused by torquing the threaded 1 <br /> 1 connections.However,when installing 1 • Use a nonhardening,solvent-free Teflon based thread sealant such as Jomar Seal <br /> 1 molded threaded bushings(tapered 1 "The Heavyweight"or Gasoila Soft Set pipe sealant. <br /> 1 major nominal pipe size x threaded I • Apply sealing compound to male and female threads. <br /> 1 minor nominal pipe size)make the 1 • Hand tighten the joint,then <br /> 1 tapered bonded joint first and allow itto 1 use a wrench to getfull make- Threads to Dry Fit and to Seal <br /> 1 cure before making up the threaded I up.Standard pipe wrenches Nominal <br /> 1 joint.This order of joint make-up will 1 can be used with care on Pipe Size Threads to Additional Approx.Torque <br /> 1 prevent damage to the bushing. 1 fiberglass adapters:Do not (in) (mm) Dry Fit Threads to Seal Req.(Ft.Lbs) <br /> 1 overtighten. 11h 40 4-5 3 100 <br /> L-------------J The parts should make up the 2 50 4-5 3 110 <br /> number of threads shown in 3 80 5-6 3 130 <br /> the table above.Otherwise,a 4 100 6-7 2 160 <br /> proper seal may not be 6 150 7-8 2 200 <br /> effected when tightened. •25 Ft.Lb.maximum torque for isolation bushings <br /> Isolating flex connectors at the shear valve <br /> When flex connectors are directly buried at the dispenser,regulations frequently require <br /> r—————————) that they be cathodically protected and provisions be made to avoid stray current <br /> Never use a pipe 1 electrolysis and corrosion.In such cases the flex connector must be electrically isolated <br /> wrench directly on the ' from the shear valve and from other metallic components in the system.Experience has <br /> pipe:wrench up only on ; shown that nylon isolation adapters do not perform well inasmuch as the poor <br /> 1 adapters. ' mechanical strength ofthe material results in creep or thread deformation with <br /> J subsequent leakage. <br /> L———————® <br /> Ameron manufactures a 11h NPT female x 1'h NPT male fiberglass-reinforced isolation <br /> adapter which maybe mounted between the flex connector and the shear valve. Follow <br /> the same general installation procedures as with other NPT threaded fittings.After <br /> applying the sealing compound,hand tighten the adapter.Final make-up requires 1 th to <br /> 2 additional turns. <br /> g Shear valve <br /> 1 Y2 NPTfemale <br /> +F— <br /> 21A <br /> B 1 i1h NPT 4 <br /> I g,Dualoy isolation <br /> Fig.8-1.The Ameronfiberglass-reinforced y ,male adapter <br /> isolation adapter is mounted between the <br /> flex connector and the shear valve. 1'A <br /> Maximum torqueon isolation <br /> bushing is 25 ft.lbs. <br /> `/SS flex connector <br /> R\ Ili NPT male <br /> \116 NPT both ends <br /> female <br /> 12 <br />