×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Product Goes Solid !

Product Goes Solid !

Product Goes Solid !

(OP)
Hey Group

I'm seeing a SiC v SiC cartridge seal on 'glue'
having the faces broken araoung the slots on start up
as the product is going solid in the stuffing box area

The pump is a PC type and is going thru a lot of stop / starting at the moment - in the past the SiC v SiC was fine as the pump was run almost constant.

A move to Tung v SiC or Tung v Tung is planned
but I was wondering if there are alternatives
which have seen good results.

i.e. A Plan 32 External Flush (maybe only on STOP),
A devise to stop the dry product 'grabbing' the faces
A method of removing fluid from the box on stop

TIA

The Milkboy

-
Milkboy

RE: Product Goes Solid !

(OP)
I should add that I am not keen on Tung v Tung as have always thought this a bad combo

The lube for the faces comes from a barrier as the seal
is a double cartridge

TIA

-
Milkboy

RE: Product Goes Solid !

What is the product again? What kind of pump again? Just a little more information.

I agree, Tungsten on Tungsten is not a face combination that I suggest.

RE: Product Goes Solid !

(OP)
The product is Glue basically

Like the glue kids use at school
PVA Glue ?

Hence the pump is a Prog. Cav.


Seal was fine for years when one batch
was run thru and then flushed clean I assume

Now when its stop/started the product
sets around the faces

On start up, the faces are broken around
the drive slots

-
Milkboy

RE: Product Goes Solid !

You're alreay using a Plan 53. So you've found a compatible fluid to lubricate the seals.  Good.

The reason to switch from SiC to WC was due to the drive pin or lugs crashing into and cracking the SiC. There are other metallic face materials such as bronze and Ni-Resist.  But I tend to steer clear of them.

I'm not sure if your operations folks would buy into a Plan 32.  It can be a hard sell.  A Plan 32 with a close tolerance throat bushing to contain the foreign fluid could work.  

A second option is a cousin of the dry gas seal.  This kind of seal actually pumps the compatible fluid across the seal faces.  Leakage can be much less than the double seal.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources