FUEL SYSTEM 24 INTERCHANGEABILITY: Intermixing and interchanging tube fitting components of different manufacturers can be dangerous. Leak-tight seals that will withstand high pressure, vibration, vacuum, and temperature changes depend on close tolerances and consistent, exacting quality control in conjunction with good design principles. The critical interaction of precision parts is essential for reliability and safety B. PROCEDURE FOR NPT THREAD ASSEMBLY NPT threads assembly should be completed in a clean environment to prevent any dirt or foreign material from entering the end-connection. STEP 1 1 Remove the thread protector from the male threads. 2 As the thread protector is removed from the male threads, bits of plastic from thread protector may remain in the mail threads. 3 Remove this material from the threads using a clean, dry, soft-bristled brush STEP 2 Check components to ensure minimum thread engagement. 1 Tighten the male end-connection into the female end-connection until finger tight. 2 Mark the wrench flat on the male component. 3 While holding the female component stationary, loosen the male component while counting the number of turns until the two components separate. 4 The minimum allowable thread engagement is 2 turns. Therefore, if you can not engage at least 2 turns, do not use this combination of male and female components. Select a different combination of components and repeat this step until the MINIMUM 2 thread engagement is achieved. WARNING: Do Not Assemble Components With Less Than 2 Turns Of Thread Engagement. STEP 3 Where possible; place the component containing the female threads into a vise (preferably one with smooth jaws). NOTE: Tighten the jaws only on the flats. Tighten just enough to securely hold the component as over tightening could result in damage to the component. Use an additional wrench in applications where a vise cannot be used. 6
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