TESTING.

 

  • Testing Eauipment

Houston Valve and Testing Co. operates four hydrostatic testers. These machines are designed for optimum efficiency in valve service. There are two racks manufactured by Dunn Valve Testers, for intermediate size valves, and two of our own design, one for rapid testing of small forged steel valves and one for testing very large valves. Glycerine filled gauges are used on all these racks, for accuracy, and are regularly calibrated by American Flow Measurement Co.

 

  • Testing Procedures

All valves are tested to API 598 specifications. These requirements include, but are not limited to, a high pressure closure and shell test with water. The shell test is made with both parts of the valve closed, the valve partially closed, and the packing gland tight. There can be no visible leakage through the casting, body bonnert joint, or packing for this test. The high pressure closure test is made on each side if the valve is designed to hold pressure from both directions, or the correct side otherwise. No leakage through the disk, behind the seat, or through structural damage is allowable.

 

  • Specialized Tests

All steel pressure containing casting can be certified using nondestructive testing methods by our inspection contractor, Precision Inspection, Inc., when specified. Radiographic inspections are performed to MSS SP54 standards while magnetic particle inspection is made to MSS SP53 specification. Dye penetrant testing is done to ASTM E 165 specifications, and ultrasonic inspection is performed to ASTM SE213 standards.

 

  • Final Preparation and Indentification and Inspection

Aluminum painting of the valve body protects the valve from external corrosion. The valve is painted in the closed position and drain taps are fitted with thread protectors. The end connections of each valve are fitted with flange or butt-weld end protectors. Indentification tags may also be provided per customer's request.

 

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