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Mechanical Seal Fcae(CARBON) WORN OUT phenomenon in High Temperature water pump

Mechanical Seal Fcae(CARBON) WORN OUT phenomenon in High Temperature water pump

Mechanical Seal Fcae(CARBON) WORN OUT phenomenon in High Temperature water pump

(OP)



Hi, we are running HIGH TEMPERATURE & HIGH PRESSURE Water pump ( about 45 kg/cm^2 / 110 'C)


First of all, we are using Seal plan 32/61 (actually we dont using 61 right now)
32 plan with 108 'C seal coolant water get in to M/SEAL (Vendor recommend 80'C, but there is a little problem in cooling unit, so right now , inlet water to cool M/SEAL temperature is over 108'C)

The problem is...
the seal face, actually the part of Carbon WORN OUT Continuously.
I know that we have to more cooling ability for 80'C , that's why i have to know the reason of below ( to persuade my boss :> )

HERE'S THE THINGS!!
WHAT HAPPENS ON MY SEAL
i asked for the vendor of M/SEAL , he was likes, the high temp' of water (over 100'c) become a steam, and its evaporation or condensation can be damaged to seal

is it right ?
something gonna happen likes cavitation ?

please describe me, what makes my seal fail....

RE: Mechanical Seal Fcae(CARBON) WORN OUT phenomenon in High Temperature water pump

You are correct. Your seal is failing as a result of the water between the seal faces flashing to steam. Steam is not a good enough lubricant to prevent hard contact between seal faces. The seal is running dry. You need to reduce the temperature. For this service, we would normally use a Plan 23 with circulation from the seal to a cooler in a somewhat closed loop set-up. This can drop the water temperature around the seal much lower. For your pump, using a water cooler, you should be able to drop the temperature at the seal down to 40 °C or lower.

Johnny Pellin

RE: Mechanical Seal Fcae(CARBON) WORN OUT phenomenon in High Temperature water pump

Fully agree!

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