Abstract: A method and apparatus for detecting leaks in a test chamber utilizing pressurization of the chamber with a gas, compares the rate of change of the gas pressure in the test chamber with the rate of change of the temperature of that chamber with the difference in such rates of change being read as a function of test chamber leakage.

Abstract: Leakage of a pipe wall is detected by forming a test chamber around the pipe radially opposite the wall area to be tested by bringing together a pair of test chamber halves each including a semi-annular anvil segment, an outer housing segment and an elastomeric seal sandwiched between the segments with the ends of the anvil segments of the respective test chamber halves being brought into abutment and continued closing movement of the test chambers causing the outer housing segments to extrude the elastomeric seals radially inwardly around the non-yielding anvil and against the pipe surface and circumferentially to effect a hermetic seal at the meeting ends of the test chamber halves and at the pipe wall surface. Thereafter the test chamber formed between the pipe surface and the encircling anvil ring is pressurized and changes in the pressure are read as a function of pipe wall leakage.

Abstract: A method and apparatus for detecting leaks in a test chamber utilizing pressurization of the chamber with a gas, compares the rate of change of the gas pressure in the test chamber with the rate of change of the temperature of that chamber with the difference in such rates of change being read as a function of test chamber leakage.