seal failure due to vapor lock & Carbon deposits

0) This will be available in the pump manual

1,2,3) - Most probably over heating of the sealing face - check why lubrication failure, excessive seal face pressure (if it is meachanical), incorrect lubricant, poor quality of seal may be just some of the reason.

Please note - vapour lock and carbon deposits are not the causes they are the effects.

First you say that the seal failure was caused by "vapor lock" and carbon deposits. Then you ask "what is vapor lock?"

If you do not know what vapor lock is, how can you say that it caused the seal failure.

The absence of elementary logic in some questions is mind-boggling.

sorry for not clarifying my question, the report said that the cause was from the vapor lock, and i read this report and after reading it many questions came to my mind.

sorry for not clarifying my question, the report said that the cause was from the vapor lock, and i read this report and after reading it many questions came to my mind. one of them was what is the vapor lock.

is it not much easier to search in google?

Rather than the term vapor lock would it not be more the case that your condensate is "flashing" into steam as it passes across the seal faces? This could be more a case that you want to introduce a cooler stream in the seal. Taking a slipstream of the discharge and passing it through a cooler and then an orifice into the stuffing box prevents this flashing from occurring at the seal faces and leaving any mineral deposits there. It also provides a slightly elevated pressure so vaporization wont occur there. Could also be your selection of seal faces. Hot water can be more of a problem for seals than hydrocarbons which often have some measure of lubricating properties which water does not. Make sure that the opposing seal face combination is the recommended one for hot water and inject some cooler water into the seal cavity,

basically what I was getting at on post #7

Whats the size of this pump?

The GPM and Pressure?

The NPSH?

The Temperature of the Condensate?

The Type od seals being Used?

Is there cavitation also?

first of all check seal specification.......see whether it is suitable for your application....may be the seal would be under rating.....

and second see the proper installation method and shaft run out is the major cause for seal failures....match the runout reading with seal specification..........

vapour lock is only possible in negetive suction try to have flooded operation of pump means positive suction pressure

put a strainer in sealing water inlet line and check it after 20-30 days of running if u found the same deposite then that would be clear that foriegn particals were damaging the seal faces.

so try all this things step by step