Specifications

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