Eddy Current Test

This test is used to detect hidden flaws, inhomogeneties, cracks etc. using the test procedure described in ASTM E-426. Tecnofour Flaw Mark detector with digital data recorder is used for testing entire length of the tubes.

Hydrostatic Tests

All tubes and pipes produced at HMTL are compulsorily subjected to 100% hydro testing. Hydrostatic Testing can be carried out at pressures upto 450kg /cm sq. Customers or their deputed inspection agencies can witness 100% hydro testing at our plant. For thin wall tubes Pneumatic Testing (Air under water) is done at 300 psi max. Air pressure.
Note: Length upto 100 ft. long subject to size.

Ultrasonic Testing

If asked by the customer, pipes are subjected to Ultrasonic testing. An acoustic transmitter probe generates a sound beam which is applied to test piece using oil as Couplant. The Ultrasonic Test Equipment is calibrated using a reference test piece with artificial test which is from the same pipe lot that is to be tested. The tested tubes are considered flawless if they do not cause any indications longer than that produce by the reference test piece. The Ultrasonic Test is conducted as described in ASTM E 213/A-450.

Ultrasonic Unit-I Unit-III
Type rotating probe method 10 Channels 20 Channels
20 Channels 4 probes 8 probes
Transverse Defect 4 probes 8 probes
Wall Thickness 1 probes 2 probes
OD & ID 1 probes 2 probes
Speed of Testing 15-20 meters per minute 30-40 meters per minute
Notch Depth 5% of wall thickness 5% of wall thickness

Metallurgical Investigation & Corrosion Testing

Stainless steel tubes are tested for micro structure, carbide precipitation & grain size using Metallurgical Microscope. Corrosion testing is conducted as per ASTM - A - 262, practice A, B, C, D, E as required by the users. Residual Stress test is also conducted. All these tests are conducted at our in-house laboratory which is approved by third party inspection agencies. HMTL has also invsted in 3 PMI testing machine to further ensure final quality of tubes.

Visual Inspection

All products at HMTL are subjected to 100% visual inspection.

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