Appendix
SP 305
Startup 250:Users:Danny:Desktop:Operation manuals:line pumps:maverick
(P305):Appendix.fm
Operation Manual -
67
Weld-on Ends / Coupling Comparison
Heavy Duty
Metric
Grooved
(Victaulic)
Male / Female
O-Ring
(shown with clamp)
weldends4.eps
0.15"
NOTE: All pressure ratings listed refer to 5 inch (125mm) diameters
in like-new condition. Other pressures would apply to other sizes.
3. Metric couplings are designed for pressures up to
1400 PSI @ 2:1. They have 85% more contact area
than grooved couplings. The face is flat and will not
draw pipe together. Although they have a raised
edge, they are not compatible with Heavy Duty cou-
plings unless a special clamp or an adapter pipe is
used to change from one style to the other. Metric
connections are standard equipment on booms
because of the weight savings compared with other
styles.
2. Heavy-Duty couplings are designed for pressures
up to 2250 PSI @ 2:1. They have 20% more contact
area than metric couplings, and a tapered face that
draws the pipe sections together during assembly.
Both the ends and clamps weigh more than metric
style, and therefore should not be used on booms
without consulting the manufacturer.
1. Male / female o-ring type couplings have the
highest pressure rating of the ends commonly used
for concrete pumping. They can withstand 4350 PSI
@ a 2:1 safety factor. They are self aligning and
waterproof when used with o-rings in good condi-
tion. Typically not used on booms because of their
weight. Pipes equipped with this style coupling
cannot be swapped end-for-end.
4. Grooved couplings (lip height of 0.15” or less)
are designed for pressures only up to 750 PSI @
2:1. The recessed groove is hard to clean when
changing pipe on a job. The weld-on end fails
before the pipe because the groove is cut into the
pipe thickness, making it the weakest spot. Grooved
couplings are not recommended for concrete pump-
ing applications.
Shown is a comparison among commonly used
ends/couplings. No two ends shown can be joined
without the use of an adapter pipe or a special
adapter clamp. Clamps and pipe strength must also
be considered when determining proper system
requirements. The ratios shown in the text below
represent the safety factor from burst : working
pressures.
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