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  • Users: BarrySand
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  1. BarrySand

    Protecting Sweet Pipeline from back flow when tying into Sour

    It has been standard practice at our company to use two check valves on a sweet pipeline when tying into a sour pipeline in order to protect against back flow. I've been looking through all the codes I can get my hands on to find this as a requirement but can't find it written anywhere...

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