- Hydrotest of ASTM A795 Grade A Pipes
The hydrostatic test is a very important part of the manufacturing process for ASTM A795 Grade A pipes. This test ensures that the pipe will be able to withstand the high pressures that it will be subjected to in its intended application. The test involves filling the pipe with water and then subjecting it to very high pressure. If there are any leaks in the pipe, they will be revealed during this test. The hydrostatic test is an essential part of the manufacturing process for pipes and helps to ensure that the finished product is of high quality.
- Nondestructive Electric Test of ASTM A795 Grade A Pipes
The ASTM A795 standard outlines a nondestructive electric test that can be used as an alternative to the hydrostatic test. This test involves sending an electric current through the pipe and then measuring the resistance of the pipe material. If the pipe material is resistant to the current, it is likely that it is strong enough to withstand the stresses of use. This test is less destructive than the hydrostatic test, which involves filling the pipe with water and then measuring the pressure required to break the pipe. As a result, the nondestructive electric test is often seen as a more efficient and reliable method for testing pipes.
- Flattening Test of ASTM A795 Grade A Pipes
The standard requires that a flattening test be performed on ASTM A795 Grade A pipes to assess their ductility. The pipes are flattened between parallel plates in 3 steps, with the weld located either 0 or 90 degrees from the line of force.
1. The first test is for the ductility of the weld. This tests to see if any cracks or breaks occur on the inside or outside surfaces until the distance between the plates is less than two-thirds of the original outside diameter of the pipe.
2. The second test is for ductility exclusive of the weld. This test is to see if any cracks or breaks occur on the inside or outside surfaces until the distance between the plates is less than one-third of the original outside diameter of the pipe, but is not less than five times the wall thickness of the pipe.
3. The third and final test is for soundness. This test is conducted by continuing the flattening until the specimen breaks or the opposite walls of the specimen meet. Evidence of laminated or unsound material or incomplete weld that is revealed during this flattening test shall be cause for rejection.