Page 59 - 2010-2022 hose manufactureing ability and guide

NPSH American Standard Washer Seal NPSH - - NPSH or NPT
Straight Pipe for Hose
Couplings
National Pipe Straight
Hose
NPSM American Standard Washer Seal NPSM - - NPSM, NPT
Straight Mechanical Or or NPTF
Joints Mechanical Seal
National Pipe Straight
Mechanical
SAE 45° Flare Society of Automotive Mechanical Seal SAE Male – SAE Female
Engineers

Note – Thread sealant is required for Thread Seal connections except for NPTF during initial use.

Note – Compatibility of thread types does not insure compatibility of fittings. Always use mating
fittings of the same type.

For detail drawings of various thread types, see ANSI B.2.

The hose/coupling interface is not as Examples of a short shank coupling are shown
straightforward as coupling terminations. in Figures 5-2a & 5-2b.
Because of the difficulty in making the
transition between rigid or high modulus
materials such as metal to flexible or low
modulus materials such as rubber, numerous
coupling configurations have evolved. In an Figure 5-2a. Figure 5-2b.
attempt to generally describe common coupling
configurations, the coupling types will be Short shank couplings
broken down into the following categories:

1. Reusable shanks with clamps
2. Reusable couplings without clamps
3. Non-reusable couplings

4. Special Purpose fittings and clamps Figure 5-3. Long shank coupling for
water applications.
REUSABLE SHANKS WITH CLAMPS
This category of coupling consists of a shank,
that can often be reused, and banding clamps. B. Long Shank - The serrated shank on this
To simplify the category, it can be divided into type coupling is long enough to permit the
short shank, long shank, interlocking type, and use of two or more banding clamps. The
compression ring type couplings. additional shank length and banding clamp
allows the coupling to be used in medium
A. Short Shank - The definition of a short pressure applications such as air, water, oil,
shank coupling is the shank is only long gasoline, and chemical discharge. This type
enough to accommodate a single banding coupling is not recommended for pressures
clamp. This type coupling is suitable for exceeding 100 psi (0.69 MPa) when used in
low-pressure service in air, water, and hoses with diameters (I.D.) 4 inches (100
suction applications. This type coupling is mm) or larger. Examples of long shank
not recommended for pressures exceeding couplings are shown in Figures 5-3, 5-4, 5-5
50 psi (0.35 MPa) when used in hoses with and 5-6.
diameters (I.D.) 2 inches (50 mm) or larger.

RMA/IP-2/2003 38