kompaflex has a state-of-the-art digital X-ray department. The images can be checked and evaluated on a monitor immediately after they have been taken. Archiving in digital form ensures that the recordings are still available in their original quality years later. The X-ray inspection is performed in accordance with ISO 17636-2 and the ASME Code.

The surface roughness of an object is determined by the measuring device measuring a two- or three-dimensional profile of the surface. Our measuring device is used to determine the various roughness parameters, including the widely used Ra value.

The dye penetration test is carried out in accordance with ISO 3452. Irregularities can be seen on the surface, particularly in the weld seams. The dye penetrant test is a surface crack test that appears very simple at first glance, but the correct application requires a great deal of experience.

To detect a leak of the inner layer, the expansion joint is pressurized with compressed air. Nekal testing fluid (special soapy water) is applied. Visible air bubbles indicate a leak. This is a standard test carried out by kompaflex for all mult-ply expansion joints.

Expansion joints can be subjected to a helium leak test. The following test methods according to EN 1779 can be performed at kompaflex:

• A1 Vacuum technique total
• A2 Vacuum technique partial 
• A3 Vacuum technique local
• B6 Vacuum chamber

Leakage rates of up to 1×10^-10 mbar*l/s can be proven.

For the water pressure test, the expansion joint is sealed tightly on both sides. The test is carried out at our factory by pressurizing with water up to the specified test pressure, whereby no liquid may escape (no pressure drop) or inadmissible deformation may occur. Pressure tests are carried out according to  DGRL/PED AD HP 30 or ASME code.

Visual testing as a non-destructive testing method was standardized in DIN EN 13018 (General principles of visual testing). Welded seams are tested in accordance with DIN EN ISO 17637.

Determination of the chemical composition of materials. PMI (Positive Material Identification Tests) are of fundamental importance for the traceability of materials. Material mix-ups can lead to considerable damage and must be absolutely excluded, especially in sensitive, safety-relevant areas. kompaflex has a PMI device to verify the use of the correct material at any time as required. 

The spring rates calculated according to the standard have large tolerances of up to +/- 30%. For applications where the spring rate is a decisive criterion, it makes sense to determine the effective value in a spring rate test. kompaflex is able to experimentally determine the axial, lateral and angular spring rate.