Seal Plans Number & other permutations

[Oxidation]

I have become involved in a project where a client needs API pump & 682 seal plans.
They have specified 1CW-FX as the preferred plan. I am relatively new to the pump seal plan world, so apologise if this appears to be a trivial question
How does this relate to the numbering system Eg Plan 11+52 for example?
Is there anywhere a nice table comparing the seal plan number & this "letters & numbers " method
Product being pumped in Benzene (C6H6) at 50 C, 2 to 5,5 barg, flow rate 300m3/hr

 

[DubMac]

This is NOT a trivial question, you are pumping BENZENE!!! Don't screw around with this one, don't try to "Google" an answer; you can kill people with a small mistake.

Call one of the experts at John Crane, Flowserve, Chesterton, etc and let THEM tell you exactly what you need. They will never quote anything not in compliance with both API 610(pumps) or API 682(seals). They will be happy to explain all you need to know about codes, specs, selection reasoning, etc. With all due respect to you, selecting a seal for Benzene service should absolutely not be a "learning exercise"; take advantage of the expertise available (even if it means talking to the dreaded salesman).

As far as your 1Cw code goes, it looks like one of the old proprietary codes where each digit specifies a material for a different component of the seal....many up to date experts on this forum can a better explanation about those numbers.

 

[bmw318be]

Yes sometimes what cliemt recommended is contradict to what seal vendor propose, always throw back the question if they have any concerns in client's selection.

I encountered problem where client mentioned touline and my seal selection is used is kalrez, however after seal installed seal damage and fiund iut the chemical attack on the seal and discovered the chemical there is other composition .

I Would also concerned about the viscosity that would affect the life of the pump and for hydrocarbon if internal gear is used, must ensure there is sufficient npsha to pump the hydrocarbon to prevent cavitation.

 

[Oxidation]

Dubmac,
You appear to not have read or understood the thread.
The customer has specified the seal plan (this is a very large petrochemical company), so they know what they are doing.
I am not guessing/googling a seal solution.
What I was looking for was a comparison of API 682 seal plans (numbered) related to this "new" (first time I have come across it) method of specifying a seal plan.

Before jumping to conclusions re-read the thread before answering

 

[DubMac]

Although I did read and re-read your post, I am sorry that I did not understand what you were asking; did not mean to offend. To the best of my understanding, the digit code (1CW-FX)is signifying seal "arrangement", i,e, single, double, tandem, etc. API seal flush plan numbers would have no direct correlation to seal arrangement; thus any table relating the two would be very vague and almost meaningless.

What caught my eye was the fact that (again, no intent to offend) you mentioned being relatively new to the "seal plan world" and you were involved with sealing benzene. Many experienced and well intentioned end-users make mistakes every day specifying mechanical seals. Just trying to suggest that a competent major seal manufacturer makes or at least blesses the final selection. Not a comment on anyone's competency, benzene just scares the hell out of me.

In answer to your question, I tried to Google for a nice table for quite some time with no fruitful results.

 

[nfinit]

This may help with your understanding.

http://www.mcnallyinstitute.com/18-html/18-8.html

and to DubMac's defense, a single seal for Benzene service is a little suspect, if in fact they require 1CW-FX. Not knowing all the details leaves a lot for discussion, but it may be worth a request to John Crane/Flowserve/etc. as to what their preferred design would be. I, personally, would prefer to see a dual cartridge seal in this service.

 

[TenPenny]

To answer the question actually asked, the '1CW-FX' describes the SEAL only, and makes no statement about the flush plan.

 

[Oxidation]

In reply to all who have posted,
Two well known industry suppliers have suggested Seal Plans & pump materials which are suitable for the application.
The seal plans offered were Burgman 11+52+61.
Thankyou for all the help & advice