Bubble Tight Shut Off Ball Valve

Bubble Tight Shut Off Ball Valve

Short Description:

Bubble-tight Ball valve, no bubbles should be observed in a prescribed time span during air pressure testing of a new valve in the closed position.

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Key Specifications / Features

Bubble tight usually refers that there is no visible leakage during a defined testing period.There is no definition of tight shut off (TSO) with respect to valves in API 6D or ASME B16.34 and this is where the confusion arises.  

The customer may refer the leakage rate according to the following standards:

 

API 6D: Specification for Pipeline and Piping Valves

Test Medium: Water (Air and gas only if specified by purchaser)

Test Duration: 2 – 5 minutes (depends on the size of the valve)

Test Pressure: ASME B16.34

Leakage Rates: Rate A: Soft seated-ISO 5208 / Rate D: Metal seated-ISO 5208

 

API 598: Specification for Valve Inspection and Testing

Test Medium: Water, Air, Gas

Test Duration: 15 sec – 2 minutes (depends on the size of the valve)

Test Pressure: Low pressure closure or high pressure closure (depends on the valve type)

Leakage Rates: Rate A: Soft seated: Zero / Meatal seated (liquid test): 0-96 drops/minute / Meatal seated (gas test): 0-192 bubbles/minute Metal seated (depends on the size of the valve)

 

ISO 5208: Specification for Industrial Valves

Test Medium: Water, Air, Gas

Test Duration: 1 – 2 minutes (depends on the size of the valve)

Test Pressure: Low pressure closure or high pressure closure (depends on the size and type of the valve)

Leakage Rates: Not defined, as per requirement of the related valve product standard

 

EN 12266-1: Industrial valves. Testing of metallic valves. Pressure tests, test procedures and acceptance criteria. Mandatory requirements

Test Medium: Water, Air, Gas

Test Duration: 15 seconds – 2 minutes (depends on the size of the valve)

Test Pressure: high pressure closure – 1,1 x PN for liquid, 6 bar max. for gas testing

Leakage Rates: Not defined, as per requirement of the related valve product standard

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