Dry Gas Seals – Seal gas supply control for double seals

In most cases, a simple back pressure control regulator or valve can be used to deliver inert seal gas, such as nitrogen, to the seals. The set point should be sufficiently high to assure a positive pressure differential above the maximum expected sealing pressure, including the settle-out pressure. The control regulator or valve can have a manual bypass and isolation valves to allow on-line maintenance. As previously described, a low pressure alarm and shutdown are also required to avoid seal damage.

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