Recommend me the correct packing to use

[Shaharudin]

Hi Fellas

question about gland packing

i have a multistage pump (boiler feed water pump)with working pressure around 4-7 mpa and working temperature 100-150 degree celcius...

been using high pressure gland asbestos packing but recently the packing keep leaking and need changing frequently..already doing re-alignment and also replaced the shaft sleeve but the leaking still occurred..

can u guys suggest to me any alternative to resolve the problem?

thanks in advance guy for ur help..

 

[Reifleman2]

As a seal guy, I would automatically recommend going to a cheap cartridge seal, carbon on silicon carbide. Will last a VERY long time and will work much better than packing.

If that's not an option, I would recommend going to the site of a packing supplier like this one:

http://www.johncrane.com/Products.asp?r=gg&l=en&Element=Prod_ProdPage_MechPacking_1

Peruse through the offerings, they all have working ranges and suggested uses.

Finally, I would make sure you are installing the packing properly. I have seen packing installed in a variety of ways, and its very easy to mess up and cause leakage. Most manufacturer's will be happy to provide a recommended installation sheet, and one that I have is attached below. Most mistakes I've seen made are on steps 4 and 5.

Hope this helps

 

[lframe]

Shah-
In HVAC applications, (chilled water, hot water heating), we must have some leakeage from a packing in order to prevent it from burning up due to friction. When I was young and dumb, I tightened the packing down tight on a chilled water pump, and rather than water dripping, smoke began to evolve; they thought the building was on fire. Packing flow-by can get to an unacceptable level, above which too much make-up water is admitted into the system, along with dissolved minerals which create insulation in heat exchange surfaces. The pump would normally have a drip sump with piping to a drain to keep a mess from being on the floor or other vulnerable area; this will accommodate a modicum of leakage. Reifleman2 has the better idea in installing a mechanical seal, if the pump can accept it. If not cost-prohibitive, starting over with a new seal-style pump might be the best for overall reliability.

 

[Shaharudin]

thanls for ur help guys,it's actually the balance ring and balance disc problem..already done the servicing..and pump works like a champs!!