CR4® - The Engineer's Place for News and Discussion®


Previous in Forum: BSW Instead of UNC   Next in Forum: Air Preheater Tubular vs Regenerative?
Close
Close
Close
14 comments
Participant

Join Date: Jul 2017
Posts: 1

Axial Flow Pump

07/29/2017 12:45 PM

hi, i got an experience in our workshop there is an axial flow impeller pump ,during the pressure test there is a leakage. any body can help to find out the pressure of delivery ,what are the parameters to calculate the pressure build up this kind of vertical axial pumps in discharge?

Register to Reply
Pathfinder Tags: pump
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19296
Good Answers: 1129
#1

Re: axial flow pump

07/29/2017 1:08 PM
__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 19994
Good Answers: 751
#2

Re: axial flow pump

07/29/2017 3:41 PM

The term "axial flow pump" is too vague to say much of anything further. A mfr and model number might help, as would flow and power usage.

__________________
In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply Score 1 for Good Answer
Anonymous Poster #1
#3

Re: axial flow pump

07/29/2017 4:03 PM

Define "leakage". Is it leaking from the pump to the outside of the pump? Piping? By the impeller, but internal? GI/GO.

You can contact the seller and they can help to find out tell you what the pressure of delivery was when they tested the pump in their lab, under controlled conditions, by technicians who know how to test pumps.

The pump curve, which should be well known to you, will tell you all you need to know.

The results an inexperienced person, such as yourself, obtains will probably NEVER be the same as the manufacturer's results.

CALL THEM!

Register to Reply
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 26721
Good Answers: 701
#8
In reply to #3

Re: axial flow pump

07/31/2017 8:59 AM

<...pump curve...> For a positive displacement pump, it is more a vertical straight line.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 1224
Good Answers: 23
#4

Re: Axial Flow Pump

07/30/2017 2:58 PM

Have you seen this page ?

Register to Reply
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 19994
Good Answers: 751
#11
In reply to #4

Re: Axial Flow Pump

08/01/2017 1:13 AM

Due to weak graphics, I still haven't seen this page.

__________________
In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
Guru

Join Date: Mar 2012
Location: Out of your mind! Not in sight!
Posts: 4013
Good Answers: 92
#5

Re: Axial Flow Pump

07/31/2017 12:09 AM

The guy who is doing the pressure readings at the pump outlet can tell you!

__________________
Common Sense Dictates
Register to Reply Score 1 for Good Answer
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 26721
Good Answers: 701
#6

Re: Axial Flow Pump

07/31/2017 3:20 AM

These pumps are positive displacement ones, so the maximum pressure is determined by:

  • the maximum pressure rating of the equipment to which it is connected or
  • the maximum pressure that the manufacturer warrants on its datasheet for the equipment

whichever is the lower. The manufacturer's datasheet cannot be seen from here.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 26721
Good Answers: 701
#7
In reply to #6

Re: Axial Flow Pump

07/31/2017 5:44 AM

Exceeding the lower of the two pressures exposes the risk of, at one extreme, a minor leak to the other extreme, which is catastrophic self-disassembly.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Anonymous Poster #1
#10
In reply to #6

Re: Axial Flow Pump

07/31/2017 11:47 PM

"hi, i got an experience in our workshop there is an axial flow impeller pump"

Wiki says, "An axial - flow pump , or AFP, is a common type of pump that essentially consists of a propeller (an axial impeller ) in a pipe. The propeller can be driven directly by a sealed motor in the pipe or by electric motor or petrol/diesel engines mounted to the pipe from the outside or by a right-angle drive shaft that..."

What am I missing?

Register to Reply
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 26721
Good Answers: 701
#12
In reply to #10

Re: Axial Flow Pump

08/01/2017 3:01 AM

The manufacturer's maximum pressure rating, which is available over the telephone.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Guru
Hobbies - Musician - Engineering Fields - Chemical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jan 2007
Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis)
Posts: 3951
Good Answers: 175
#13
In reply to #12

Re: Axial Flow Pump

08/01/2017 11:43 PM

I think that AP1 was being polite. The OPs initial sentence highlighted the word impeller which would imply a non positive-displacement pump, to which you have previously stated that it is not.

Anyway, not a peep from OP. If more information were supplied... <sigh>.

__________________
"Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
Register to Reply
Guru
Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Posts: 602
Good Answers: 43
#14
In reply to #6

Re: Axial Flow Pump

08/04/2017 4:21 AM

Axial flow pumps are not positive displacement pumps, they are centrifugal pumps with impellers that look more like propellers than the radial flow centrifugal pumps do.

Like with a boat's propeller, the flow is predominantly "along the axis" of the pump shaft.

__________________
If you can't explain it simply, you don't understand it well enough. (A.E.)
Register to Reply
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 13569
Good Answers: 155
#9

Re: Axial Flow Pump

07/31/2017 1:28 PM

Read the F****** pressure gauge is the straight path to your answer.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply Score 1 for Off Topic
Register to Reply 14 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (2); IdeaSmith (1); James Stewart (1); Mikerho (1); PWSlack (4); SolarEagle (1); The Prof (1); tonyhemet (1); Tornado (2)

Previous in Forum: BSW Instead of UNC   Next in Forum: Air Preheater Tubular vs Regenerative?

Advertisement