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Reliable Burst and Proof Pressure Testing


Manufacturing, development, research, and other industries rely on pipes, cylinders, valves, and much more. Those pieces need to be of known quality to ensure integrity and reliable performance. At Trybar, we provide a range of testing services to help you determine proof pressure or another pressure type you wish to measure.

We test from low pressures of a few psi right up to those as high as 200,000 psi, using a variety of materials such as liquid, nitrogen, helium, or compressed air. Our test transducers cover virtually all pressures and are certifiably calibrated to NIST standards.

Our instrumentation varies with the needs of the job, from manually recording data to high-speed, multichannel computer-based data logging. Customers have trusted us to perform these tests on items from 7 psi glass chemical vessels up to 200,000psi steel tubes.

Two Sides of the Same Coin

Proof testing and leak testing are closely related functions.

Our proof testing is non-destructive and determines that a system or component can withstand a pressure slightly above the operating pressure without permanent damage or leaks. It’s considered a “stamp of approval.”

On the other hand, checking for leaks requires immersing the part in a clear liquid, such as water, pressurizing it with air, nitrogen, or helium, and checking for leaks. It’s a simple test that can be taken to the next stage by using helium and a spectrometer to check for leaking.

The Ultimate Design Check

A burst pressure test, or burst testing, is destructive and measures the pressure at which a component is permanently deformed, and at which it finally fails. This also determines how it fails, for example, by leaking or catastrophic failure. This is a “you make it, we break it” test.

Leak Testing

Really a form of proof testing, leak testing requires that the part be pressurized and checked for leaks. Often, this is done by immersing the part in a clear liquid (usually water), pressurizing with air, nitrogen, or helium, and watching for leaks.

This is a simple and versatile test. A stage further is to use helium and a mass spectrometer device to check for leaks. This is very sensitive and provides a quantitative assessment of any leak, but it requires extensive fixturing.

AUTOFRETTAGE

Autofrettage substantially improves the fatigue life of thick-walled, high strength, high-pressure components through pressurization, which causes material near the bore of a component to yield, but the rest of the wall is still elastic. When the pressure is released, the material at the bore winds up with residual compressive stresses, which can substantially improve the fatigue life under cyclic loading.

Pressure Guage for Pressure Testing in Houston, TX

Under Pressure, Undersea

External pressure testing services, such as that required for subsea components, is very difficult, especially for large parts. In those instances, a pressure vessel is required that can accommodate the piece while also having a removable end for the test piece to be placed inside. We have a limited capacity for external pressure testing but are willing to consider adding the capability to accommodate new test requirements.

Transient Pressure Testing

Our transient pressure testing measures up to 100,000 psi using quartz transducers and charge amplifiers with very high response speeds. They accurately measure very rapid pressure changes, as you will find in gun barrels, chemical reactions, and so on.

Handling the Strain

Our strain gauges are small, highly specialized electrical resistors glued to a surface, and they measure changes in resistance as the structure stretches. The strain is calculated, taking into consideration the properties of the test material. This information determines at what point the test piece passed its elastic limit and started to yield.

You can trust us to create custom pressure testing fittings and fixtures to replicate real-world forces for accurate and realistic tests. Also, we offer temperature-controlled testing services in ranges from -100F up to 2,000°F.

If you need well-proven fluid for high pressures, remember that we also carry EPF 262 Extreme Pressure Fluid.

All our tests are carefully planned and executed, and we supply test reports and certificates with each one. Our best work is done “under pressure.”

Case Study:
Thin-Walled Titanium Pipe

Before Leak Testing in Houston, TX After Leak Testing in Houston, TX

 
A high-strength, thin-walled, titanium pipe was tested to determine the burst pressure, and the longitudinal and circumferential stiffness. The chains were used as a safety precaution in case the end fittings blew off. The challenge was to seal the ends of the tube without welding, which could affect the material. The wall was too thin to thread, so we designed end fittings that could be glued on, resulting in no damage to the material and no stress concentrations. The fittings were designed to accommodate the anticipated end load of 210,000 pounds at burst pressure. The pipe was strain gauged using eight gauges to provide the information needed to calculate the stiffness.

Case Study:
Thick-Walled Steel Tube

Before Pipe For Leak Testing in Houston, TX After Thin-Walled Titanium Tube Test

 
A thick-walled heat treated steel tube was strain gauged and burst to determine the elastic limit, the burst pressure, and the mode of failure (ductile or brittle). The strain was recorded up to the maximum pressure of 115,000 psi.

Contact us to learn more about how we can meet your testing needs. We are proud to serve customers nationwide from our location in Houston, TX.