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PT Coupling Company • P.O. Box 3909 • Enid, OK 73702 • Tol l-Free: (800) 654-0320 • Tol l-Free Fax: (800) 828-2649 • Fax: (580) 237-3435 • info@ptcoupl ing.com • www.ptcoupl ing.com
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Hose
Ferrule
Body
Interlock Area
Shoulder of ferrule interlocks into groove
of body or fitting, preventing the ferrules
from sliding off the fitting, This feature
greatly improves hose retention.
ProGrip Group of PT Coupling manufactures coupling retention
systems for attaching hose to fittings either by externally
crimping or internally expanding. The products range in sizes
from 1/2“ up to 8”. Standard materials available are plated
carbon steel and stainless steel. Other materials are available on
request.The fittings produced cover a wide range of applications
including sanitary, pharmaceutical, chemical, petroleum,
industrial, and fire protection.Various types of hose shank
designs are utilized to maximize the performance of the different
fittings and ferrule combinations.All of the different hose shanks
are available with any type of connecting end. Ends available
include male and female NPT Pipe,Victaulic® style groove, butt
weld, socket weld,I-Line, Pacific Coast thread, tri-clamp, and
flanged.
Ferrule/Sleeve Crimp Diameter Calculation
Following is the calculation to determine the crimp diameter
required for various hoses and end fittings:
The following information must be measured or determined:
Hose Assembly End Example
Hose O.D. __________ 2.50
Hose I.D. __________ 2.00
Fitting Hose Shank Mean O.D. __________ 2.00
Ferrule/Sleeve Wall Thickness __________ .065
Hose Wall Compression Required (%)* __________ 25
*This number is usually supplied by hose manufacturer and generally is from 20-25%.
From this information, the crimp diameter can be determined using the following formula:
Crimp Diameter = Hose O.D. - Hose I.D. + Shank O.D. + (2 x Ferrule Wall Thickness) + [(-Hose Comp) x (Hose O.D. - Hose I. D.) / 100]
Example: Crimp Diameter = 2.50 - 2.00 + 2.00 + (2 x .065) + [( -25) x (2.50 - 2.00) / 100] = 2.505
Hose Assembly End Crimp Diameter = _____ -_____ + _____ + (2 x _____ ) + [ ( _____ ) x ( _____ - _____ ) / 100] = _____
Crimp procedures must be followed closely
and safely by hose assembly personnel.
It is recommended that hydrostatic testing be
done on hose assemblies to assure the above
crimp diameters are sufficient for the intended
application.
Fitting 1.0” 1.25” 1.5” 2.0” 2.5” 3.0” 4.0” 6.0”
All Pro-Grip bodies
with mechanical 600 600 600 600 600 600 500 400
interlocking ferrule
except as listed
below
Cam and Groove 250 250 250 250 200 200 150 75
Ansi 150# Flanges 285 285 285 285 285 285 285 285
Maximum Allowable Working Pressure Ratings for Pro-Grip Fittings
(Pressure in PSI)
The above pressure ratings are for the fitting itself. There are several factors that determine the pressure rating of a hose
assembly. Some of which are hose pressure rating, method of hose attachment, quality of hose attachment, and external
fastening devices such as Tri-Clamp and I-Line clamps, flange bolts, and so forth. It is up to the hose assembler and the
end user to assure that all components are applied properly and meet the required working pressure of the system.