NPT FITTINGS
npt fittings (pipe fittings) |
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Appearance of tapered
npt fittings The male and female threads have a tapered flank and controlled truncation at the crest and root to assure metal to metal crest-root contact just as the male-female thread flanks make contact. Upon further tightening, the thread crests flatten out and allow the flanks to make full contact. This full thread profile contact theoretically give the tapered threads self-sealing ability. However, variations in condition of mating threads, fitting and port materials, assembly procedures and operating conditions make self-sealing highly unlikely without the aid of paste, tape, or pre-applied thread sealants. Suggested applications for tapered npt fittings Tapered pipe fittings are prone to leakage because they are torque-sensitive. Over-tightening can distort the threads too much and create a leakage path. Also, tapered pipe threads are prone to loosening when exposed to high vibration and wide temperature variation. Repeated assembly and disassembly only aggravates the leakage problem by distorting the threads further. Tapered pipe threads are not to be used for mechanically joining components in a system where load would be placed perpendicular to the plumbing line. This weight will further weaken the sealing joint. In light of its sealing mechanism, assembly restrictions and design limitations, pipe thread connections are optimal only when the following conditions exist: 1. Minimum hydraulic shocks or vibration 2. The fitting is limited to one or two re-uses 3. The system utilizes low pressure; or few operating cycles (static condition) for higher pressure service 4. Skilled workers trained in the pros and cons of pipe fitting assembly are present For these reasons, tapered pipe threaded connections are not recommended for dynamic pressure systems. Tapered pipe fittings are still widely used in industry, though, because of their relative low-cost, widespread familiarization among users, lack of alternative port designs offered by many component manufacturers, and/or when exposed to more caustic media which requires the corrosion resistance of metal-only seals. |
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Hydraulic Supply Co. is located in Florida
and Georgia, and is a distributor for Eaton Aeroquip, Eaton, SSP
Fittings Corp. and Ward Manufacturing, leading manufacturers of npt
fittings Our on-line Stock Products Catalog includes npt fittings and has over 1400 pages of hydraulic, pneumatic and fluid conveying products to choose from - and every one of them is in stock and available for immediate delivery. Click on “Order On-line” for browsing product categories, checking price and quantity on hand, order entry and much more. See our Contact
Us page to get in touch and get the help you need with your npt
fittings
requirement. |
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Links to other pipe
fittings pages |
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