A multitude of thermostatic principles specifications can be selected when certifying hoses and other hydraulic components—from a simple proof set up to the most sophisticated test requirements. Each segment or product has its own set of standards and these norms are constantly under either revision, implementation or being created when new material or innovative applications become a reality.

The widespread use of a product usually requires a set of standards to accompany it. Automotive, aerospace, industrial hydraulics, and most recently CNG applications, can be listed as some of the more complex hose tests. Traditional testing concepts must give away for more effective testing procedures, as well as the fact that other testing parameters are also to be measured. This is especially true when the complexity of a thermostatic impulse testing of hydraulic hoses is required.

When a thermostatic environment is combined with an Impulse Test, new testing parameters have to be measured and a new set of variables must to be taken into the equation. Another factor that has to be deeply analyzed is how the specs define the test procedure. Sometimes even the specs are not as forthcoming as one would wish and the interpretation of which may require further investigation.

There are some international standards largely covering impulse test stand with a thermostatic chamber. For instance, in aerospace, the SAE standards, AS series has some publications dedicated to testing of coupling, fittings, hoses, and tubing assemblies. Besides demanding impulse tests, some of these specs require ambient temperatures either below-zero or well above chamber temperature. The test equipment has to simulate the environment in which an airplane is exposed. There are also National Aerospace Standards, which require temperatures below 0°C when running pressure cycles.

Read more: Applying Thermostatic Principles in Impulse Testing of Hydraulic Hose