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  1. VELU1970

    Tight Shut-Off (TSO) as per API508

    As per attached file, API 508 defines leakage rate for "TSO". My question: 1. What is the leakage rate defined for "TSO" class as per API508 / ISO 5208, Any one has this standard please let me know. 2. Is TSO leakage rate superior than ANSI Class VI.

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