Piping Plan 13

In Piping Plan 13 there is recirculation from the seal chamber through a flow control orifice and back to the pump suction or pump suction piping.

With purchaser approval, the flow control orifice may be omitted if it is not needed to achieve the required flush flow rate.

NOTE Piping Plan 13 is the standard flush plan selection for vertical pumps that are not provided with a bleed bushing below the seal chamber. The seal chamber pressure on vertical pumps suppliled without a bleed bushing would normally operate at full discharge pressure. Because of this arrangement there is no pressure dlfferential to allow a Piping Plan 11 to work. In Piping Plan 13, product is routed from the seal chamber back to the pump suction to provide cooling for the seal and to vent air or vapors from the seal chamber.

Piping Plan 13 provides self-venting on vertical in-line pumps provided differential pressure is sufficient to ensure circulation and seal chamber pressure is sufficient to prevent vaporization.

Piping Plan 13 is also used in high-head pumps where the use of Piping Plan 11 would require too small of an orifice or would produce too high a flush flow rate. This plan will generally not work well in low-head pumps because of the low pressure differential between the seal chamber and the pump suction. The suitability of the service for Piping Plan 13 can be determined by calculating the required flush flow rate and then calculating the required orifice size.

A distributed flush injection is not recommended with a Piping Plan 13.

Malavazi NOTE: Recommended for liquids with a high degree of abrasiveness.

For liquids with crystallization characteristics, Quench is recommended due to micro leakage on the faces, otherwise plug the injection connection leaving the drain free to prevent environmental disasters, since the floating ring will act as a safety point.