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8 NPT thteaded 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. r———————j—————— Always dry fit fiberglass and steel threads without sealing compound.It should be possible to dry fit the threads as shown in the following table.If the proper In general,threaded connections i number of threads cannot be made up,select a new steel fitting. should be made up before adhesive- bonded joints to minimize the I Making the joint possibility of damage to bonded joints I Threads must be clean and dry before applying thread-sealing compound. caused by torquing the threaded connections.However,when installing I • Use a nonhardening,solvent-free Teflon based thread sealant such as Jomar molded threaded bushings(tapered I Seal"The Heavyweight"or Gasoila Soft Set pipe sealant. major nominal pipe size x threaded 0 Apply sealing compound to male and female threads. r minor nominal pipe size)make the' 0 Hand tighten the joint,then tapered bonded joint first and allow it I use a wrench to get full Threads to Dry Fit and to Seal to cure before making up the threaded I make-up.Standard pipe Nominal I joint.This order of joint make-up will wrenches can be used with Pipe Size_ _ __ __ Threads to Additional prevent damage to the bushing. I care on fiberglass adapters: (in-) (mm) Dry Fit Threads to Seal Do not overtighten. 1112 40 4-5 3 L—————————————J • The parts should make up 2 50 4-5 3 the number of threads 3 80 5-6 3 shown in the table above. 4 100 6-7 2 Otherwise,a proper seal 6 150 7-8 2 may not be effected when -- - tightened. Isolating flex connectors at the shear valve r————————- When flex connectors are directly buried at the dispenser,regulations frequently Never use a pipe I require that they be cathodically protected and provisions be made to avoid stray wrench directly on the I current electrolysis and corrosion.In such cases the flex connector must be electrically I pipe:wrench up only I isolated from the shear valve and from other metallic components in the system. on adapters. I Experience has shown that nylon isolation adapters do not perform well inasmuch as J the poor mechanical strength of the material results in creep or thread deformation with L———————— subsequent leakage. Ameron manufactures a 1 lh NPT female x 11h NPT male fiberglass-reinforced isolation adapter which may be mounted between the flex connector and the shear valve. Follow the same general installation procedures as with other NPT threaded fittings.After applying the sealing compound,hand tighten the adapter.Final make-up requires 1 th to 2 additional turns. Shear valve .�1'/z NPT female 2'A 11b)VTDualoy isolation male A--�_adapter Fig.8-1.The Ameron fiberglass-reinforced A' isolation adapter is mounted between the ilex connector and the shear valve. 2,/a 1 a �M, SS flex connector 1'/2 NPT 1112 NPT male female both ends (by others) TY .y 12