Previous in Forum: FORK LIFT TRUCKS   Next in Forum: How can i be using ASME codes on the internet to do my design?
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
thesidh
Participant

Join Date: Mar 2008
Posts: 4

Why Is My Pump Stuck?

04/16/2008 9:53 AM

It sounds very absurd but one of my vertical Sundyne pump gets stuck whenever I take it inline. It gets free on isolating. The pumped fluid is heavier hydrocarbons at a pressure of 20bar. I opened the pump for checking the casing and the impeller. No mark of any rubbing on either of them. Gear box was also inspected and found OK. I boxed it up again and asked to take inline. The mystery is still unsolved!!
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
Dances with Trees
Guru
Hobbies - Car Customizing - Dances with Trees Canada - Member - because I can Hobbies - CNC - too much fun Hobbies - Target Shooting - paper shreader

Join Date: Mar 2008
Location: Ottawa, Ontario, Canada
Posts: 769
Good Answers: 10
#1

Re: Why Is My Pump Stuck?

04/16/2008 12:04 PM

That is indeed interesting.

Have you checked the power feed to the pump? Sounds like the pump is fine the next component in the system is the power feed and control system, might be the problem... Look for corroded connections, you might even go as far as re-doing all the connections from the pump bask to the 'on switch'.

__________________
 Kevin "Dances with Trees" Willey
Register to Reply
user-deleted-1104
Power-User
Engineering Fields - Mechanical Engineering - New Member Technical Fields - Technical Writing - New Member

Join Date: May 2007
Location: Parallel 45
Posts: 226
Good Answers: 21
#2

Re: Why Is My Pump Stuck?

04/17/2008 2:31 AM

Could you check if the driver is rotating? If yes, check the coupling and fix the coupling trouble.

__________________
 Look over to the next challenge
Register to Reply
3
Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#3

Re: Why Is My Pump Stuck?

04/17/2008 3:49 AM

This type of inline vertical Sundyne pump is characterized by its higher RPM (may be 6000 RPM), and therefore, please do the following:

1. Check that the power is on.

2. Check that the pump is fully primed (filled with hydrocarbon).

3. Start pump operation with the suction valve is fully open and the discharge valve is fully closed, to allow establishing of a starting current (for a about 8 second).

4. Start to open the discharge valve step-by-step and observe the the ampere until the pump attain its designed current.

__________________
 It is better to be defeated on principles, than to win on lies!
Register to Reply Good Answer (Score 3)
No more Good Answers.
Anonymous Poster
#5
In reply to #3

Re: Why Is My Pump Stuck?

04/18/2008 12:28 PM

should i keep the miniflow also closed?
Register to Reply
Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#6
In reply to #5

Re: Why Is My Pump Stuck?

04/20/2008 2:20 AM

should i keep the min. flow also closed? No.

The min. flow shall be open during both the startup and operation, whatever your controlling by a control valve or manually by manual valve and orifice.

__________________
 It is better to be defeated on principles, than to win on lies!
Register to Reply
Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#4

Re: Why Is My Pump Stuck?

04/17/2008 3:59 PM

Dear thesidh,

I interesting to hear from you saying that your pump is now OK.

__________________
 It is better to be defeated on principles, than to win on lies!
Register to Reply
Anonymous Poster
#7
In reply to #4

Re: Why Is My Pump Stuck?

04/28/2008 2:43 PM

Dear Mr. Galala,

He needs to vent the impeller case before starting pump.
Register to Reply
Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#8
In reply to #7

Re: Why Is My Pump Stuck?

04/29/2008 1:07 AM

Yes Guest,

If you read my Post #3 : 2. Check that the pump is fully primed (filled with hydrocarbon) you will find the reply. That is means neither air nor vapor are permitted to be located inside the pump before startup.

__________________
 It is better to be defeated on principles, than to win on lies!
Register to Reply
Register to Reply
Have a Different Question?
8 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

Abdel Halim Galala (4); Anonymous Poster (2); Dances with Trees (1); user-deleted-1104 (1)

Previous in Forum: FORK LIFT TRUCKS   Next in Forum: How can i be using ASME codes on the internet to do my design?

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (83 right now)
Show Members
Advertisement