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First of all, Many thanks to Flexibox and Longeron... The service product is Phenates...The chamber pressure is around 1bar absolute. Initially we thought contamination is ok @ minimum level while using 150 N lub oil as barrier fluid. Later we realized that the inflow of barrier fluid due to...

whats your experience in sealing 1200cP viscosity liquid at ambient temp. ? would upstream pumping seal be helpful in this application? or u have any good reliability record with any other crane seal for this application? if uptream pumping seal being used for this application, i'm very much...

Dear Flexibox, Thanks for reply. The bellow does not clog up but it shear off as the faces stick together. As per operation, it is best to keep the temperature below 40 to avoid polymerization. O/B coking mainly caused by high pressure(15bar) temperature as the seal system(53B) uses air fin...

Dear All, I would like to hear from someone who has experienced leakage problems with dual mech seal that is designed for pumping styrene monomer.we are having seal reliability issues as the seal fails very frequently say 2 times a year due to various reasons such as i/b bellow tear during start...

Dear All, I am really thankful to all of you. Its amazing to get such a worthy response. I am satisfied with your inputs and thank you once again for sharing your knowledge.

Dear All, I appreciate if anyone could clear me this doubt as i am very new to rotating equipments. "mark the shaft and rotate 2 1/4 revolutions weekly as a part of preservation in all machinery’s as per API-686". In this statement, why the rotation is 2 1/4 turn. What is the specific...

Dear Longeron and JJ, Thanks for your inputs. Yes the seal is tandem seal operates nitrogen as buffer fluid. This N2 dilutes the ethylene leakage and connected to the flare. The piping plan is 72/76. Process fluid is Liquid ethylene which is in vapour state at the stuffing box as per design...

Hi, Good day to everyone. I appreciate if anyone can tell me the common causes for a Dry Gas seal failure in a Cryogenic Service. A John Crane Type 28 VL is installed on a (newly commisioned )Ethylene pump. Its a Vertical Turbine pump. Since the seal is a proven seal and it is running for...

Dear Igoochy, Yes, it is vertical split liquid ring vacuum pump. It will be definitely helpful to me if you could send me that drawing. How could I contact you? please give me the details. Sincere thanks to you.

Dear Sirs, Thanks for your Post. As Mr.JJ mentioned, it was happened on the ApI 53 plan seal. The Pump has two Seals. On Drive end we find heavy fretting at I/B seal (diametrically,deep groove for 60% and relatively lesser at another 40%)and no fretting at O/B. On NDE O/B seal got heavy...

Dear All, Why fretting happens in particular seals only? For example, In a process industry, if we have a hundred seal almost 80% of the seal's secondary seals contacts the shaft/sleeve. But only in particular seals failure happens due to fretting at the shaft/sleeve. One more intresting thing...

Dear JJ, Really, I am happy about your quick reply. Now I understand that how a cold start up could crack the hard face. For that my thanks for you. As you mentioned I checked the viscosity of the barrier fluid is only 0.37mm2/Sec. So I hope it could not be a cause for that. And I checked the...

To All, Recently I experienced a problem(Out board stationary ring crack) with my mechanical seal. The Outboard seal start to leak after two days of startup. leakage rate was 3drops/min. we found during dismantlig that the crack(near anti rotation pin groove) at the out board stationary ring...