Pumping Ring

Hi,

Please tell the following data so that i can guide you the best sealing solutions.

1. in C2, what is the fluid temperature?

2. (C2) what is the suction pressure? and discharge pressure of the pump when pumping C2?

3. Tandem MS is used to contain the process fluid for environmental purpose and perhaps to prevent explosion as flamable.

4. What type of pump you have?

5. What is the problem of the mechanical seal?

Regards

thanx for ur respond.

1. fluid temperature is 22.9 C - 38.9 C

2. suction pressure is 4200 KPaG max, discharge 3380 KPaG. but C2 is the product and there's no pumping ring at the inboard and outboard itself. thats is why am wondering if this is the main problem of this pump.

3. the pump type is double tandem cartridge.

the inboard is using piping plan 12, outboard is plan 52 (buffer at outboard is methanol)

and one more thing, the problem is the heat is higher when compare with the same seal model but at different plant (but still the same product and pressure).

ok, here is my evaluation....

tandem mech'l seal is a double seal. plan 12 is the circulation fluid coming from discharge pump back to outer board of 1st mech'l and will be back inside the pipe (center eye of the impeller), this the purpose of plan 12 on the first mech'l seal arrangement with tandem seal.

plant 52 is a containment if the first seal will leak. and provide also the cooling of the seal for the 1st mech'l seal and the second.

however, the buffer fluid should have a cooling coil inside the buffer tank. The pumping ring on the mechanical seal is the one who create a radial force to throw-out the buffer liquid back to the tank for contineous circulation. that is the purpose of the pumping ring as what you are looking for. However, you need to check carefully if the buffer fluid is cooling using the coolling coil built-in on the buffer tank.

Tandem seal is use for flammable / hazardous / toxic process fluid. to contain any possible leakage from the mechanical seal that will harm the environment, or flammable, hazard, toxic that may also harmful to human.

Regards,

thank u very very much 4 your explaination. it helps me a lot on solving my task regarding the problem mech seal. hope u guys will guide me again next time k....

I am not clear as to where you are measuring the high temperature or what you mean by high, but some general comments.

A Plan 12 takes fluid from the discharge of the pump back to the seal chamber via a filter and and an orifice. Not sure why you would need a filter for C2 but do not know your process. The purpose of this plan is to provide cooling to the product (inboard) seal of your Plan 52 which is the one doing most of the work as it is sealing the product. In addition it will raise the pressure in the seal chamber so that you have liquid at the seal faces. If your product is dirty then I would suggest that you check this filter as if it is blocked you will not be carrying the heat away from the inboard seal and could have flashing across the seal faces.

The purpose of a pumping ring is to assist the thermosyphon flow of the methanol buffer fluid. Depending on seal size and temperatures etc it may or may not be required. There are many types of pumping rings, some are scrolls which are direction of rotation sensitive and some are just notches taken out of the seal cage.

The outboard seal of this system sees a pressure difference across the seal faces equivalent to the height of the reservoir if the reservoir is correctly vented and therefore produces very little heat. Check that there is zero pressure build up in the reservoir and if water cooling of the reservoir is present ensure that this is working.

thank u very very much 4 your explaination. it helps me a lot on solving my task regarding the problem mech seal. hope u guys will guide me again next time k....

The pumping ring mounts on the rotating member inside the mechanical seal and forces circulation of the buffer fluid up into the Plan 52 seal pot where there is a cooling coil, normally a SS tubing coiled inside the seal pot with water circulation through the coil. Without a pumping ring you must rely on convection circulation to the seal pot.

thanx, it's a new info for me. guys, if u feel like want to teach me more, don't feel hesitate to let me know. am keen to learn anything with hands wide open.

thanx, it's a new info for me. guys, if u feel like want to teach me more, don't feel hesitate to let me know. am keen to learn anything with hands wide open