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THRUST (ASTM A-1056)
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| This
test is conducted with an apparatus as shown in Figure 4.
The plain end of one steel pipe is machined to the maximum
outside diameter tolerance; the other to the minimum. The
plain ends are machined circumferentially with grooves 0.015"
in depth (with an inclined angle of 60°) at 1/8"
intervals over the area covered by the elastomeric gasket.
The surface between the grooves is machined to 125 RMS. The
machined pipe ends were joined with an MG COUPLING, torqued
to 175 inch-pounds, and the assembly was filled with water.
Hydrostatic pressure was applied at a rate of 1 psi every
30 seconds to the required target pressure and held for 10
minutes. Test requried no leakage or axial movement in excess
of 0.150 inches. |
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|
| MG COUPLING (sizes tested) |
Hydrostatic Pressure (psi) |
Movement (inches) |
Results |
| 1½" |
20 |
0.024 |
No Leakage Occurred |
| 1½"x
2" |
20 |
0.040 |
No Leakage Occurred |
| 2" |
20 |
0.046 |
No Leakage Occurred |
| 3" |
20 |
0.058 |
No Leakage Occurred |
| 4" |
20 |
0.105 |
No Leakage Occurred |
| 5" |
20 |
0.126 |
No Leakage Occurred |
| 6" |
18 |
0.077 |
No Leakage Occurred |
| 8" |
10 |
0.050 |
No Leakage Occurred |
| 10" |
6 |
0.053 |
No Leakage Occurred |
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