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Circle of Safety Testing Specifcations
Specification 1001: Assembly Proof Test

The Assembly Proof Test is a non-destructive hydrostatic pressure test of the hose assembly. The hose assembly is filled with water and then subjected to an internal pressures equivalent to 50% of the specified minimum burst pressure of the hose assembly. The hose assembly is subjected to the internal pressure for a minimum of 5 minutes. During this time there shall be no indication of coupling slippage, pressure loss, coupling ejection, cover blisters, cover splits, leakage, or any other visible signs of failure.

Note: Parameters of this test may vary to comply with a governing industry or regulatory standard.

Specification 1002: Assembly Burst Test

The Assembly Burst Test is a hydrostatic pressure test of the hose assembly that determines the actual burst strength of the assembly.   An un-aged hose assembly is filled with water and then subjected to internal pressure, which is increased at a constant rate until the assembly fails.   The pressure is increased at a constant rate so as to attain the specified minimum burst pressure within a period of not less than 15 seconds and not more than 60 seconds.

Any signs of leakage, bulging, coupling ejection, or hose burst below the specified minimum rated burst pressure of the assembly are considered a failure.

This is a destructive test.   Assemblies that have been subjected to the Assembly Burst Test shall be destroyed.

Specification 1003: Assembly Tensile Test (Coupling Pull-off Test)
The Assembly Tensile Test is a test of the tensile force required to fail a hose assembly. A 1 to 2 ft. assembly is attached to a tensile machine with variable travel rate capability. The travel or pull rate is determined by the required testing specification (This rate is typically 1 inch per minute). When the tensile machine is operated, the coupling retention force produced is conveyed from an electronic load cell to the force indicator, which will display the gross and peak values. The tensile force is applied until sample failure or deformation limits are reached. Sample failure occurs when the hose separates or the coupling is separated from the hose.
Specification 1004: Assembly Electrical Continuity Test

The Electrical Continuity Test consists of testing the electrical resistance or a hose assembly. The electrical resistance is measured from coupling to coupling using a low-voltage ohmmeter for hose assemblies that utilize a bonding path with an electrical resistance of 1000 ohms or less. A calibrated ohmmeter having an effective internal resistance of 100,000 ohms +/- 10% is utilized for hose assemblies that have a bonding path with an electrical resistance greater than 1000 ohms. The test circuit is to have a nominal open-circuit potential of 500 volts. D.C., and a short-circuit current of 5 milliamps.

Depending upon the test specification, limits are set for the maximum or minimum allowable electrical resistance.

Specification 1005: Assembly Flex Test

The Assembly Flex Test is designed to cycle flex hose assemblies filled with fuel or water at a 90° rotation while suspended with a 10 lb. load attached to the assembly. This test simulates customers or machinery flexing the hose at the coupling in the field.

The test consists of filling the assembly with water or a non-flammable test fluid, then constantly flexing the assembly 45° back and forth from the vertical plane for a minimum of 100,000 cycles while maintaining with an internal pressure of 30 PSI.

The hose assembly must not separate, split, leak, or fray during the 100,000 cycle test.

Specification 1006: Assembly Cold Bend Test

The cold bend test consists of placing the assembly in a cold box at -40°C for 24 hours, then bending the test sample around a mandrel having a diameter that is 10 times the nominal internal diameter of the hose. The hose assembly shall show no signs of cracking or other damage.

Note: Parameters of this test may vary to comply with a governing industry or regulatory standard.

Specification 1007: Assembly Impulse Test

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.

Specification 1007-C: Chemical Assembly Impulse Test

A Chemical Assembly Impulse Test is a test which pulsates internal pressure at a rate between .5 and 1.3 Hz. through the hose assemblies at 133% of the hose working pressure for 15,000 cycles at Ambient Temperature, 160°F, 180°F, and 200°F. 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 configuration due to the size of the hose assemblies.

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.