An Assembly Impulse Test is a test which pulsates internal pressure at a rate between .5 and 1.3 Hz. through the hose assemblies for a specified pressure, temperature, and number of cycles. The test fluid is circulated at a constant rate to maintain a uniform fluid temperature within the hose assemblies.
The hose assemblies are attached to the test machine in a straight or bent configuration depending on the test specification. When testing to a bent configuration, hoses of nominal inside diameter less that 1 in. shall be bent through 180° and hoses of inside diameter of 1 in. and larger shall be bent in a 90° configuration.
Hoses are tested to the minimum specified cycles, if hoses show any signs of failure such as pin-holes, leakage, coupling slippage, coupling ejection, cover bulging or splits, are all considered a failure.