COMPLIANCE INFO_2007-2011 - Laserfiche WebLink

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M..-• f • • r-------------- 1 In general, threaded connections 1 1 should be made up before adhesive - bonded joints to minimize the 1 1 possibility of damage to bonded joints 1 1 caused by torquing the threaded 1 1 connections. However, when installing 1 molded threaded bushings (tapered 1 major nominal pipe size x threaded 1 1 minor nominal pipe size) make the 1 1 tapered bonded joint first and allow it to 1 cure before making up the threaded 1 joint. This order of joint make-up will 1 1 prevent damage to the bushing. 1 L -------------J r -------- i Never use a pipe i wrench directly on the it ipipe: wrench up only on adapters. L --------J Fig. 8-1. The Ameron fiberglass -reinforced isolation adapter is mounted between the flex connector and the shear valve. Maximum torqueon isolation bushing is 25 ft. lbs. 12 Thread preparation • 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 possible to dry fit the threads as shown in the following table. If the proper number of threads cannot be made up, select a new steel fitting. Making the joint Threads must be clean and dry before applying thread -sealing compound. • Use a nonhardening, solvent -free Teflon based thread sealant such as Jomar Seal "The Heavyweight" or Gasoila Soft Set pipe sealant. • Apply sealing compound to male and female threads. • Hand tighten the joint, then use a wrench to get full make- up. Standard pipe wrenches can be used with care on fiberglass adapters: Do not overtighten. • The parts should make up the number of threads shown in the table above. Otherwise, a proper seal may not be effected when tightened. Isolating flex connectors at the shear valve 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 electrolysis and corrosion. In such cases the flex connector must be electrically isolated 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 mechanical strength of the material results in creep or thread deformation with subsequent leakage. Ameron manufactures a 1'/2 NPT female x 11h 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-up requires 1'/2 to 2 additional turns. Threads to Dry Fit and to Seal Nominal 1'h NPT female -F 27A —0-4 Pipe Size Threads to Additional Approx. Torque (in) (mm) Dry Fit Threads to Seal Req. (Ft. Lbs) 1 Y2 40 4-5 3 100 2 50 4-5 3 110 3 80 5-6 3 130 4 100 6-7 2 160 6 150 7-8 2 200 " 25 Ft. Lb. maximum torque for isolation bushings Isolating flex connectors at the shear valve 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 electrolysis and corrosion. In such cases the flex connector must be electrically isolated 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 mechanical strength of the material results in creep or thread deformation with subsequent leakage. Ameron manufactures a 1'/2 NPT female x 11h 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-up requires 1'/2 to 2 additional turns. Shear valve 1'h NPT female -F 27A —0-4 1'h NPT male Dualoy isolation adapter 13A "e, `/ SS flex connector R\ 1'h NPT male `1'h NPT both ends female