Working principle of mechanical seal auxiliary system for API682 pump?

Working principle of mechanical seal auxiliary system for API682 pump?

PLAN11

Principle: Lead out from the pump outlet, clean the sealing end face with an orifice plate, and then enter the pump chamber. If the customer allows, it is not necessary to choose a flow restriction orifice plate to obtain the required cleaning flow rate, and the flow restriction orifice plate can be removed.

Function: It brings frictional heat to the sealing end face, avoids material evaporation, and is suitable for the sealing chamber to exhaust to the pump chamber during the start-up process.

Applicable standards: This scheme is a commonly used cleaning solution for cleaning liquids under general operating conditions.

common problem:

For high-pressure conditions, the required cleaning flow rate should be carefully calculated.

When pumping low pressure differential liquids or low viscosity liquids, do not use a flow restriction orifice plate to obtain the desired flow rate.

When this solution is used for easily polymerized liquids, the liquid may clog the orifice plate and connecting pipes, which should be taken seriously.

PLAN13

Principle: The working medium is led out from the sealed chamber and flows back through the orifice plate reflux pump channel. If the customer allows, it is not necessary to choose a flow restriction orifice plate to obtain the required cleaning flow rate, and the flow restriction orifice plate can be removed.

Effect: It brings frictional heat to the sealing end face, cools the seal, avoids material evaporation, and discharges air and steam from the sealing chamber.

Available standards: Suitable for cleaning materials without throat shaft sleeves, this plan is a standard cleaning plan.

Common problem: This cleaning solution generally does not work well in low head pumps. The reason is that the pressure difference between the sealing chamber of the low head pump and the pump inlet is too small. The suitability of this solution can be determined by calculating the required pipe orifice (orifice plate) and the required cleaning flow rate.

It is not recommended to choose a distributed cleaning method.

PLAN14

Principle: The working medium is led out from the pump outlet, enters the sealing chamber after cleaning the sealing end face through the orifice plate, and then leads out from the sealing chamber and flows back to the pump channel through the orifice plate.

Effect: It brings frictional heat to the sealing end face, cools the seal, avoids material evaporation, discharges air and steam from the sealing chamber, and reduces the pressure in the sealing chamber.

Applicable standards: Suitable for cleaning substances; Common cleaning solutions for vertical pumps.

common problem:

It is not recommended to choose a distributed cleaning method.

PLAN21

Principle: The pumped liquid is discharged from the high-pressure area of the pump and enters the internal circulation of the sealed chamber through the flow restriction orifice plate and cooling tower. If the customer allows, it is not necessary to choose a flow restriction orifice plate to obtain the required cleaning flow rate, and the flow restriction orifice plate can be removed.

Effect: It brings frictional heat to the sealing end face, cools the seal, avoids material evaporation, discharges air and steam from the sealing chamber, increases the steam evaporation margin, reaches the temperature limit of additional sealing components, reduces coking or aggregation, and improves the sealing wettability (such as boiling water).

Applicable standards: Suitable for neat, non polymeric substances.

common problem:

When the flow rate is too high, scale or blockage will accumulate on the cooling water side of the cooling tower.

When the viscosity of the cleaning fluid is high, scaling or blockage may also occur on the cooling tower medium side.

When using a liquid that is prone to aggregation as the flushing liquid, attention should be paid to the possibility of the liquid blocking the orifice plate and connecting pipes.

In dry climates, gas finned cooling towers can be used instead of water coolers.

PLAN23

Principle: The flushing liquid returns to the sealed chamber through a heat exchanger based on the pump efficiency ring inside the sealed chamber for temperature reduction and lubrication.

Effect: It brings frictional heat to the sealing end face, cools the seal, avoids material evaporation, discharges air and steam from the sealing chamber, increases the steam evaporation margin, reaches the temperature limit of additional sealing components, reduces coking or aggregation, and improves the sealing wettability (such as boiling water).

Applicable standards: Suitable for all boiling water conditions, especially boiler boiling water and most light hydrocarbon conditions. This scheme is for 80 ℃ boiling water and boiler water supply cleaning.

common problem:

The medium in the sealed chamber is separated from the material near the impeller by the throttle shaft sleeve, sealing the pump efficiency ring to ensure the circulation of flushing liquid.

Before driving, the heat exchanger coil should be fully vented, filled with liquid, and the cooling water should be turned on. Then, after driving, the seal should be able to withstand short-term high temperatures.

PLAN31

Principle: The substance is extracted clean liquid from the rotary liquid separator at the pump outlet, and then transported to the sealed chamber through the outer edge of the rotary liquid separator. Solid particles are then sent to the pump channel through the lower hole of the rotary liquid separator.

Effect: Remove solid particles from the solution or welding slag from the pipeline.

Applicable standard: high-density particle residue (including solid particles, with a particle ratio greater than or equal to twice that of the transport medium).

common problem:

1. Cannot be used for mortar.

2. When choosing this plan, it is recommended to use a throat throttling sleeve in the sealed chamber to prevent the presence of particulate matter.

3. It is not recommended to use this solution when there is gas in the pumped medium.

Excessive internal damage to the cyclone separator may reduce its stability.

PLAN32

Principle: Rinse solution is injected into the sealed chamber from an external cleaning source.

Effect: It brings frictional heat to the sealing end face, cools the seal, avoids material evaporation, and discharges air and steam from the sealing chamber.

Applicable standards: Used for solid particles or residues (alkali, amine, easy to crystallize), by providing low steam pressure or increasing the sealing chamber pressure to a certain extent, it can reduce flash evaporation or introduce steam (vacuum conditions), cavitation, evacuation, high temperature, corrosive media and other material conditions.

common problem:

1. Because the cleaning liquid will enter the pumping liquid, the cleaning liquid is chemically compatible with the pumping liquid and will not reduce the quality of the pumping liquid.

In high-temperature applications, customers should consider whether the flushing liquid will flash under the operating conditions of the pump to reduce the characteristics of the pump.

3. This plan should be used in conjunction with the throat throttle shaft sleeve.

PLAN41

Principle: Self cleaning. The pumped substance enters the cyclone separator from the pump outlet, and solid particles are extracted from the liquid through the lower hole of the cyclone separator and transferred to the pump channel. The cleaning liquid enters the heat exchanger from the outer edge of the cyclone separator for sealing, temperature reduction, and lubrication.

Effect: Improve the temperature margin of the cleaning liquid, achieve the original temperature limit of the auxiliary seal, reduce the possibility of liquid slagging and aggregation, improve the wettability of the liquid, and remove solid particles in the solution or welding slag in the pipeline.

Applicable standards: Used for high temperatures, solid particles or residues (including solid particles with a particle ratio exceeding twice that of the transport medium).

common problem:

1. A throat choke sleeve should be used to block solid particles.

2. Cannot be used for mortar.

3. It is not recommended to use this solution when there is gas in the pumped medium.

Excessive internal damage to the cyclone separator may reduce its stability.