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In Piping Plan 51 there is an external reservoir providing a dead-ended blanket for fluid to the quench connection of the gland plate on an Arrangement 1 seal. A Piping Plan 51 is typvcally used when a dead-ended atmospheric quench is needed. One example where this might be used is to provide a means to prevent or remove any ice formation on the atmospheric side of the seal of a pump operating with a fluid below 0 °C (32 °F).
One method of operation is to fill the quench reservoir with a suitable liquid. While preparing the pump for startup the block valve below the reservoir is opened and the quench liquid is allowed to sit in the área between the seal and throttle bushing. Just prior to pump startup the block valve is closed to ensure the pot is only exposed to atmospheric pressure. This piping plan is only recommended for vertical applications.