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TECHNICAL<br />
up to 15,000 PSI (1000 Bar)<br />
CONNECTION TYPES<br />
Several connection types are used at pressures of 15,000 psi (1000 bar) and<br />
below. The purpose of this section is to allow users to identify the connections<br />
needed and provide information on the features and proper use of each.<br />
Actual Size<br />
Reference Chart<br />
Pipe threads (npt)<br />
TECHNICAL<br />
• Most widely used connection<br />
type at pressures of 15,000 psi<br />
(1000 bar) and below.<br />
• Pipe threaded fittings are<br />
relatively inexpensive and<br />
readily available in sizes from<br />
1/16" to 1". Larger sizes are<br />
available with limited fitting<br />
selection.<br />
• NPT threads are tapered so that, as the thread engagement between the male<br />
and female threaded components increases, the threads get closer until the<br />
connection becomes tight.<br />
• Unlike connection types that seal using closely machined seating surfaces or<br />
soft seals (such as O-rings), pipe threads seal around the threads, with Teflon ®<br />
tape or pipe joint compound applied to the threads to prevent water from<br />
escaping through the tiny gaps between the male and female threads.<br />
• Pipe threads, on the other hand, have a significant potential for galling —<br />
where threads seize together as threaded components are tightened.<br />
Some of the factors that affect the likelihood of galling are:<br />
° Materials: many stainless steels have a higher tendency to gall than<br />
carbon steels, and like materials are more prone to galling than two different<br />
materials.<br />
° Thread quality: a rough finish on thread surfaces increases the<br />
potential for galling.<br />
° Thread profile: some manufacturers allow sharp edges at the crest of each<br />
thread causing interference with the thread roots of mating part (see<br />
illustration at right) and significantly increasing the risk of galling. All pipe<br />
threads on <strong>Jetstream</strong> products are machined with flat thread crests to<br />
prevent damage to mating parts.<br />
° Copper plating is used on <strong>Jetstream</strong> stainless steel<br />
fittings with male pipe threads to prevent galling.<br />
° Thread lubricants (anti-seize) applied to the male<br />
threads before engagement greatly reduce the chance<br />
of galling. Consistent use of thread lubricant is strongly<br />
recommended for all connections but absolutely<br />
essential for pipe threads or stainless steel connections.<br />
<strong>Jetstream</strong> of Houston, LLP<br />
Phone: US & Canada: 800-231-8192 or 813-590-1300<br />
Web Site: www.waterblast.com<br />
I-2<br />
Copyright <strong>Jetstream</strong> of Houston, LLP © 2011<br />
Effective 2/2011
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