1. Flushing Scheme 01

Scheme:

Flush the inner mechanical seal chamber from the outlet end of the pump. Operation similar scheme PLAN11

reason:

The sealing chamber is cooled and the sealing chamber of the horizontal pump is vented to prevent the freezing of the exposed pipe and the danger of fluid crystal blockage in PLAN11 scheme

Occasion:

Common seal chamber, most likely ANSI/ASME pump, is used for cleaning normal temperature fluid, which is used for single face seal and rarely used for double face seal.

maintain:

The sealing surface shall not be directly flushed during flushing, and the mechanical seal shall not be excessively cooled. The flushing flow shall be calculated according to the head loss through the internal intercepting pipe.

2. Flushing plan 02

Scheme:

Closed sealing chamber without flushing.

reason:

No secondary circulation of fluid is required. Application: large hole/open seal chamber under normal temperature operation, cooling jacket seal chamber under high temperature operation, clean fluid, vertical/jacking mixer/agitator with dry seal,

Maintenance: the process must have enough critical space for boiling point to avoid vaporization. Under hot operation conditions, there may be cooling liquid in the seal chamber sleeve all the time. Horizontal equipment must be able to exhaust by itself, and it is often used together with cooling scheme PLAN62.

3. Flushing Scheme 11

Scheme:

The mechanical seal flushing is carried out from the pump outlet through the flow limiting orifice plate, which violates the flushing scheme of single end mechanical seal.

reason:

The cooling of the sealing chamber and the exhaust of the horizontal sealing chamber increase the pressure of the sealing chamber and the critical space for fluid vaporization.

Occasion:

Usually used for clean fluids, clean, non polymeric fluids.

maintain:

Use a flow limiting orifice plate with a hole diameter of 0.125 inches at least, calculate the flow to determine the size of the flow limiting orifice plate that will allow sufficient flow in the mechanical seal chamber, determine the critical range for increasing the boiling point through the appropriate size of the flow limiting orifice plate and throat bushing, flush the machine cover at 12 o'clock for the pipeline, typical failure, blockage of the flow limiting orifice plate, and check the temperature at the end of the pipe.