Previous in Forum: Electrode Qualification Test   Next in Forum: Radiography After PWHT
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
23 comments
Rate this Comments: Nested
ropo
Associate

Join Date: Oct 2007
Posts: 26

Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 5:34 AM

How long can a submercible pump run non stop without damage in the presence of adequate water?
Register to Reply
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 Good Answers:

These comments received enough positive ratings to make them "good answers".

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!
PWSlack
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. Kettle's on.
Posts: 32135
Good Answers: 838
#1

Re: Duration of hours a submercible pump can run without stop

08/14/2013 5:38 AM

Well, what does it say on the instruction leaflet supplied with it? And why is its built-in float switch not working or why has it been bypassed? And why would anyone in his/her right mind want to do this?

__________________
 "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
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21022
Good Answers: 795
#2

Re: Duration of hours a submersible pump can run without stop

08/14/2013 6:06 AM

Forever.

(BTW, it's submersible.)

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply
electronick
Power-User

Join Date: Jun 2007
Location: ether
Posts: 356
Good Answers: 1
#3

Re: Duration of hours a submersible pump can run without stop

08/14/2013 6:12 AM

(Forever) if there´s no breach in the armature and isolation. but one should respect the maintenance intervals.

__________________
 “For no man can forbid the spark nor tell whence it may come.” ? Francis Bacon
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
PWSlack
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. Kettle's on.
Posts: 32135
Good Answers: 838
#4

Re: Duration of hours a submercible pump can run without stop

08/14/2013 7:12 AM

Er, until it has a house-brick or a large lump of wood to pump?

__________________
 "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
electronick
Power-User

Join Date: Jun 2007
Location: ether
Posts: 356
Good Answers: 1
#5
In reply to #4

Re: Duration of hours a submercible pump can run without stop

08/14/2013 7:16 AM

or about that! :)

__________________
 “For no man can forbid the spark nor tell whence it may come.” ? Francis Bacon
Register to Reply
PWSlack
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. Kettle's on.
Posts: 32135
Good Answers: 838
#6

Re: Duration of hours a submercible pump can run without stop

08/14/2013 7:29 AM

Is there a prize for the right/best/most original answer, BTW?

__________________
 "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
5
Usbport
Guru
Engineering Fields - Optical Engineering - Member Engineering Fields - Engineering Physics - Member Engineering Fields - Systems Engineering - Member

Join Date: Apr 2010
Location: Trantor
Posts: 5363
Good Answers: 646
#7

Re: Duration of hours a submercible pump can run without stop

08/14/2013 8:01 AM

It will work just long enough to lull you into a sense of complacency, then fail right when you need it the most.

__________________
 Whiskey, women -- and astrophysics. Because sometimes a problem can't be solved with just whiskey and women.
Register to Reply Good Answer (Score 5)
Go to Next Good Answer
4
lyn
Guru

Join Date: Oct 2008
Posts: 42376
Good Answers: 1692
#8

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 9:16 AM

Look for the "duty cycle" of your specific pump. It's likely 100%, as the others have said.
Register to Reply Good Answer (Score 4)
Go to Next Good Answer
2
Bricktop
Guru
United States - Member - Charter Member Engineering Fields - Instrumentation Engineering - Charter Member

Join Date: Mar 2008
Location: The People's Republic of Massachusetts
Posts: 1946
Good Answers: 73
#9
In reply to #8

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 11:15 AM

You are correct lyn!

You live or die by your duty cycle!

__________________
 I go into every human encounter expecting to be framed for a crime I didn't commit. Dilbert, 2013
Register to Reply Good Answer (Score 2)
Go to Next Good Answer
lyn
Guru

Join Date: Oct 2008
Posts: 42376
Good Answers: 1692
#12
In reply to #9

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 2:00 PM

I've noticed that my duty cycle is much shorter than it was 20 years ago.
Register to Reply
Duckman
Member

Join Date: Sep 2012
Posts: 6
#14
In reply to #12

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/15/2013 8:44 AM

Happens to the best of us, especially when our get up and go, got up and went
Register to Reply Off Topic (Score 5)
Kilowatt0
Guru

Join Date: Aug 2007
Location: Earth - I think.
Posts: 2143
Good Answers: 165
#10

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 12:40 PM

Just to clarify Lyn's post: DutyCycle

__________________
 TANSTAAFL (If you don't know what that means, Google it - yourself)
Register to Reply
2
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33319
Good Answers: 1810
#11

Re: Duration of Hours a Submersible Pump Can Run Without Stop

08/14/2013 12:50 PM

"Duty cycles vary widely depending on pump size, tank size, control switching and other factors. Motor may have recommended limits set by the manufacturer for allowable starts per day or per hour. Submersibles generally allow relatively rapid cycling without overheating because of their low inertia and rapid acceleration. However, every pumping system should be designed to minimize cycling as much as is practical. If cycling is excessive, stop-start stress and wear in the motor, pump, coupling, pipe and controls may have more influence than total pumping time has on system life. "
Usually will stop shortly after warranty period expires.....

http://www.peerlessxnet.com/documents/tibs/TIB-32_Submersible-Motors-Reliable-Performance-Installation.pdf

__________________
 All living things seek to control their own destiny....this is the purpose of life
Register to Reply Good Answer (Score 2)
Go to Next Good Answer
3
brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#13

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/14/2013 11:53 PM

As you have not given the application, I will speak from what I do with ESP's I install in oil & water wells.

The "Run life" depends on several factors.. the pump is operated within the pump curve, no voltage spikes and power failures, good quality power, if using a VSD - suitable harmonic filters, highly trained engineers to assemble the pump, motors etc, correctly designed pump and motor suitable for the PI & BHP of the well.

As for 'duty', once switched on, leave it on, switching the pump on and off, does it no good and dramatically reduces the run life from years to months.

ps: the average run life of the multi-stage electrical submersible pumps I run is a minimum of 4 years, which is 35,064 hours (including the extra day for a leap year).

__________________
 The square root of nothing is what you make it!
Register to Reply Good Answer (Score 3)
Go to Next Good Answer
ndt-tom
Guru

Join Date: Jun 2007
Posts: 1035
Good Answers: 40
#15

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/15/2013 9:26 AM

14 posts, and not-a-one has asked yet :

Was said submersible pump manufactured in Connecticut, California, or China...?

I'm a-willing to betcha it jist mite makuh bit-o difference...
Register to Reply
brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#17
In reply to #15

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/01/2013 11:59 PM

Hi Tom, just noticed you comment. The pump stages in use these days for the big centrifugal pump companies are mostly made (cast) in China, then shipped to wherever and machined before assembly.

Once upon a time, Reda Pump, from Bartlesville, Oklahoma had their own foundry, but the 'Clean Air Act' stopped that. So now the pump stages (impellers & defusers) are all cast overseas, but machined and assembled either in the US, Singapore, UAE or the UK.

__________________
 The square root of nothing is what you make it!
Register to Reply
ndt-tom
Guru

Join Date: Jun 2007
Posts: 1035
Good Answers: 40
#18
In reply to #17

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/02/2013 12:18 PM

"Understood"... and "agreed"...
Just as a scroll down the names on the right-hand side at alibaba would seem to insinuate, "most-of-everything" is made in China nowadays...

IF you *just saw* my comment, then you also couldn't help but notice "somebody" designates it as "OT".

In my 'perhaps-not-so-humble' opinion, 99.999% of the posts in the whole of CR4 deserve to be "OT'd".

I'll grant you that MY comments are tending-to-get ... 'abbreviated' ... 'terse', even.
In THIS CASE (Post #15 above), because the OP didn't bother to specify whether his question pertained to a positive displacement-type 'submersible pump', or a centrifugal-type 'submersible pump' or a turbine-type 'submersible pump' or...(???)

Worse yet , not one single person asked what the OP meant by: "run non stop without damage in the presence of adequate water?"

Did 'ropo' mean run non-stop "dead-headed", "free-flowing", pumping at "full-head"...
is the "adequate water" meaning "sufficient quantity, but GRITTY" or does it mean "clean/clear water" or WHAT...?!?

Like Stedou73ish said (Post #16)...."So many factors to consider" ("GA")

As I stated HERE (Post #8) and likewise stated HERE at Post #21:

"As happens all-too-frequently ... here is another thread racing off on multiple tangents with a whole lotta 'guess-work' going on."

I am STILL struggling to even THINK about adding a comment at THIS thread.
68 comments (as of 10-2-2013 a.m.) and not a single-solitary person CARES whether this humongous gearbox is driven by an electric motor, a belt, a diesel engine .... (?)whether it is STATIONARY, or on a locomotive...!? (See *Ref's* at bottom here)
EVERONE is simply ASSUMING what THEY want to assume, and blowing answers out the keister... NOT BOTHERING TO CONSIDER the unit's age, materials (other-than the cast-iron-casing), etc...

But, once again, speaking DIRECTLY-TO 'ropo's question (here), as it was put VERBATIM... not reading one single iota of ASSUMPTION into it...
((and, having a smidge of 1st-hand experience, tearing things apart simply to see how they were constructed, and how well made)):

the comment above (#15) was alluding-to the fact that the motor itself plays a pivotal role in the life of a 'submersible-pump' (irrespective of "type").

Thus, I stand-by my statement that any buyer / user WILL find there to be differences (though some are subtle) between pumps made in India or China and those made in Connecticut or Ohio or in New York or elsewhere in the good old USA.

. . .

.


*Ref's*

Swami's OP is concise-yet-UNCLEAR:
"how to detect crack in a gear box casing, having a huge gear box, which stores 850 litres of oil, unfortunately there is a crack in casing. unable to figure out where crack is?
Is there any way to find out?"

at post5 he adds:
"Oil leaks slowly. When gear box ready for installation then after 6-7 hours found oil leak. and its minute"

then at post7 he adds:
"we found oil on floor. that makes us certain that there is a small crack"

at post 8 he adds:
"right now its in workshop for repairing. kindly advise for the test & how to repair?"

at post11 he adds:
"material: Cast Iron ... Size: We don't know where crack is?"

post 13 adds:
"casing thickness is of 6 cms"

post38 adds:
"there are curvatures at the corners"

post63 adds:
"This gear box is more than 80 years old, no one knows anything about it." ... and he gets a GOOD ANSWER...(!?!)

AND STILL ... no photos, and NO CLUE as to what drives this 'gearbox', or what IT in turn drives...
H E C K , it *could* be nothing more than a leaky washer-gasket on a drain-plug, but NOBODY CARES...!
All-Too-Much-Fun doing the "WAG" thing...!
Register to Reply Score 1 for Off Topic
brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#19
In reply to #18

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/02/2013 4:31 PM

I hope you feel better for that? I have to agree.. way to much WAG!!

__________________
 The square root of nothing is what you make it!
Register to Reply Score 1 for Off Topic
ndt-tom
Guru

Join Date: Jun 2007
Posts: 1035
Good Answers: 40
#20
In reply to #19

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/02/2013 4:49 PM

"OT" here (self-inflicted) re: ..."feel better..."

"Yes" , as a matter of fact , I do...! ...and, "thanks" ... (I *assume* that you must have had something to do with "un-OT'ing" my original post...)

Register to Reply Off Topic (Score 6)
Tornado
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21022
Good Answers: 795
#21
In reply to #18

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/02/2013 7:12 PM

This is not the leaky gearbox thread.

__________________
 In vino veritas; in cervisia carmen; in aqua E. coli.
Register to Reply Score 1 for Off Topic
ndt-tom
Guru

Join Date: Jun 2007
Posts: 1035
Good Answers: 40
#22
In reply to #21

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/03/2013 9:26 AM

"Totally_Understood"...("not the leaky gearbox thread") (self-inflicted 'OT' here)

. . . as I'm sure you knew that I knew...

As I wrote (above), linking-TO that thread:

"I am STILL struggling to even THINK about adding a comment at THIS thread."

Both the link AND the associated *Refs* were tossed-in (in 'analogous-fashion') simply to EMPHASIZE the point I was trying to drive home.

Over the past 6+ years, I have watched the quality of BOTH questions and answers in the forums (in large part) deteriorate from the "nearly sublime" to the "positively absurd".

It seems to me (IMHO) that this is due (also in large part) to the fact that all-too-many are assuming that they can read the "OP's" mind.

An EXAMPLE: (VERY generalized)

'OP': "I have this 1hp motor which somebody disconnected the wires. Plz tell me how reconneckt. Your immediate reply apreciated."

Ans#1) "Use multimeter to ohm out which leads go together...(etc...)" <Obviously ASSUMING that the OP knows what a multimeter is!!!?

Ans#2) "It's probably a single phase unit so here's what you do...(etc...)"

Ans#3) "I worked on 3phase units all MY life, so here's what you do...(etc...)"

Ans#4) "Your armature must be busted, that's why it got disconnected, so here's what you do...(etc...)"

Meanwhile, the OP never finds his way back, and everybody has taken a turn blurting out essentially meaningless nonsense ... SOME being farcically-incorrect!

AND ALL I AM SAYING IS: We should PRACTICE asking more questions FIRST.

<< rant mode off >>

Register to Reply Off Topic (Score 4)
brich
Guru

Join Date: Oct 2009
Location: sometimes Wales,UK.. was Libya, now Oman!
Posts: 1715
Good Answers: 117
#23
In reply to #22

Re: Duration of Hours a Submercible Pump Can Run Without Stop

10/03/2013 9:34 AM

Exactly! I would like to know where the folks that offer solutions to un-asked questions get their crystal balls from?

__________________
 The square root of nothing is what you make it!
Register to Reply
2
Stedou73ish
Guru
Engineering Fields - Mechanical Engineering - Ever Changing United States - Member - From the Redwoods to the Valleys Engineering Fields - Control Engineering - Building blocks or writing code - to keep you comfortable

Join Date: Apr 2008
Location: 38th Parallel
Posts: 750
Good Answers: 19
#16

Re: Duration of Hours a Submercible Pump Can Run Without Stop

08/15/2013 12:51 PM

Until it breaks down....which will happen on Friday night at 5:00 just when your the last one out the door.

So many factors to consider, Like Lyn said refer to its duty cycle, and then there is electrical power supply, whats in the wter it is pumping, was it sized properly for the aplication to begin with.......

__________________
 To be or not to be........ok that's a trick question.
Register to Reply Good Answer (Score 2)
No more Good Answers. Go to first "Almost" Good Answer
Register to Reply 23 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 Good Answers:

These comments received enough positive ratings to make them "good answers".

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:

brich (4); Bricktop (1); Duckman (1); electronick (2); Kilowatt0 (1); lyn (2); ndt-tom (4); PWSlack (3); SolarEagle (1); Stedou73ish (1); Tornado (2); Usbport (1)

Previous in Forum: Electrode Qualification Test   Next in Forum: Radiography After PWHT

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Quality Assurance / Control:
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 (45 right now)
Show Members
Advertisement