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1. Inspect components for damage or contamination. 2. Lubricate or apply compatible sealant to male pipe thread. 3. Screw fitting into port and lightly wrench to seat threads. 4. Mark fitting and adjacent surface to indicate initial seating position. 5. For straight fittings, tighten using mean to maximum recommended T.F.F.T. listed in Table l. 6.
Pipe Fuel Thread datasheet. This page provided the thread dimensions of 3/8 - 18 NPTF. NPTF stands for National Pipe Thread Fuel, based on ASTM B1.20.3. It is also called Dryseal Pipe Thread. It is a variation of the more popular NPT thread standard based on ASTM B1.20.1.
The L-1 taper pipe thread plug gage is used first. This gage has a notch at a distance of L-1 from its small end. The pitch diameter at the notch is equal to the E1 dimension in the Table.
HOW TO PROPERLY ASSEMBLE NPT PIPES & FITTINGS. By Don Oldiges & Phil Croteau. Table of Contents. Assembly of. Fit to Hand ASME Standard. Pipe Thread Compounds. PTFE (Teflon) Tape. Pipe Dope, Thread Compound, and Thread Sealants. Anaerobic Resin Compounds. Using PTFE Tape Alone. Using PTFE Tape in Combination with Compound. About the Author.
NPTF stands for National Pipe Tapered Fuel. . The basic profile is identical to the common NPT thread. The main difference is that NPTF provides a leakproof seal without using a sealant. It is obtained by tight tolerances and gauging requirements that create interference fitting in all conditions.
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NPTF Classes of Product Threads. Class 1 Threads - “Acceptability is determined by coordinated use of L1 & L2 gages for external product threads and L1 & L3 internal product threads. Crest and root truncation is generally considered to be controlled by tooling or other means”.
