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9 NPT threaded Isolating flex connectors at the shear valve CgfilleCtlOnS(COr3t'd) When flex connectors are directly buried at the dispenser,regulations frequently require that they be cathodically protected and provisions be made to avoid stray current " _r s,.�_ _ electrolysis and corrosion.In such cases the flex connector must be electrically isolated , r from the shear valve and from other metallic components in the system.Experience has Never use a pipe wrench directly shown that nylon isolation adapters do not perform well inasmuch as the poor on the pipe:wrench up only on adapters. mechanical strength of the material results in creep or thread deformation with � subsequent leakage. L---------- Ameron manufactures a 1'/a NPT female x 1'/z NPT male fiberglass-reinforced isolation adapter which maybe 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-tap requires 11/2 to 2 additional turns. Shear valve pt r 1'/s NPTfemale �—21/a--0-- 11/2 NPT Dualoy isolation male adapter 2Y: Fig,9-1.TneAmeron fiberglass- reinforced isolation adapterls mounted SS flex connector between the flex connectorand the 1 ��1 Ya NPT male shear valve. both ends 11/2 NPT {by others) female I 10 Repair procedures Duafoy 3000/LCX is very resistant to impact damage.It can be damaged,however, by paving stakes,large concrete pieces or other hazards.in the event of damage,the pipe can be repaired using these procedures. Usually the damaged area is obvious.If the exact location of the damage cannot be determined, it may be necessary to replace that full leng.h of ripe.Standard leak detection methods(soapy water)can be applied progressively along the length of pipe to locate the damaged or defective section.If the primary pipe is leaking at an unknown location,the cut ends of the jacket at each end of each piece of pipe car be soaped to isolate the leak.If the containment pipe is leaking,the surface can be soaped. Minor damage(isolated to less than one inch of pipe length) • Cut out the damaged pipe. • Remove the jacket and taper each of the ends of the remaining pipe • Assemble coaxial coupling or primary coupling(molded coupling sleeve placed on pipe)following standard installation practices. • Assemble primary coupling following standard installation practices. Minor damage[containment only](isolated to less than one inch of pipe length) • Sand area around damaged area- approximately one inch in all directions. • Recover cutjacket section from field jacket removal tool,remove tape and sand from inner surface.Sand inner surface. • Apply thin coating of adhesive to sanded surfaces. • Wrap jacket section over pipe and secure in place until adhesive cures. Major damage(greater than one inch of pipe length) • Remove at least 15 inches of pipe length or the full length of pipe if damaged area is greater. • Remove the jacket and taper each of the ends of the remaining pipe • Dry fit two couplings and intermediate pipe nipple into the gap. • Proceed as above for each end of repair area.Finished repair is as shown on the next page.