115
Appendix
SPB Operation Manual
Weld-on Ends / Coupling Comparison
Shown is a comparison among commonly used
ends/couplings. No two ends shown can be joined with-
out the use of an adapter pipe or a special adapter
clamp. Clamps and pipe strength must also be consid-
ered when determining proper system requirements.
The ratios shown in the text below represent the safety
factor from burst : working pressures.
1. Male / female o-ring style couplings have the high-
est 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. They are typically not used on booms
because of their weight. Pipes equipped with this
style cou- pling cannot be swapped end-for-end.
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.
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 oth-
er. Metric connections are standard equipment on
booms because of the weight savings compared
with other styles.
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 chang-
ing pipe on a job. The weld-on end fails before the
pipe because the groove is cut into the pipe thick-
ness, making it the weakest spot. Grooved cou-
plings are not recommended for concrete pump-
ing applications.
All pressure ratings listed refer to 5-inch (125mm)
diameters in like-new condition. Other pressures
would apply to other sizes.
Heavy Duty
Metric
Grooved
(Victaulic)
Male / Female
O-Ring
(shown with clamp)
weldends4.eps
0.15"
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