water injection pump issue
water injection pump issue
(OP)
Dears ,
i looking for your help my manager give me task to determine the size of booster pump suitable to pumping water into water injection pump multistage operate with 55 KW electrical motor to raise the pressure from 500-800 PSI to make injection into well .
this is first time i dealing with this subject ,kindly i looking for your help to give me any text papers any any advise to put the parameters in the consideration to make the subject successful .
Thanks in advance .
Br
John gladstone .
i looking for your help my manager give me task to determine the size of booster pump suitable to pumping water into water injection pump multistage operate with 55 KW electrical motor to raise the pressure from 500-800 PSI to make injection into well .
this is first time i dealing with this subject ,kindly i looking for your help to give me any text papers any any advise to put the parameters in the consideration to make the subject successful .
Thanks in advance .
Br
John gladstone .





RE: water injection pump issue
Start on page 20.
RE: water injection pump issue
I appreciate for your quick response but I need how can determine the proper type of booster pump size as pressure and flow rate to be contnous supply into water injection pump for oil christmas tree
RE: water injection pump issue
Then look up "power calculation for pump" or better still call a pump vendor or fill out a data sheet and send it to a pump vendor with that critical information I listed above. That gives you shaft power. You then need to factor in motor efficiency (say 90%) to get electrical power required.
Why has your manager given you this task without asking or knowing if you are capable of doing it? Far better to be honest with him/her and say that you need some guidance or teaching on how to do it. You could get this horribly wrong if it is assumed you know what you are doing when clearly you don't.
Get the data above, work it out then come back to the forum to see if you got it right.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: water injection pump issue
As LittleInch said, your manager should not have given you this assignment without a better explanation and direction to you. You're going to get frustrated, they aren't going to get what they want.
RE: water injection pump issue
Actually the system will be water injection pump system for christmas tree .the system required as follows
Discharge pressure of water injection pump must be 500-800psi to get this the section pressure must reach 80psi with continues flow rate .
Because when we start the system the water injection pump was evacuate the line within milisecond .so I looking to get better booster pump can give continues and higher flow rate to guarantee water injection pump was operate properly continously.
Please advise is there any reference
To guide me I will appresiate
RE: water injection pump issue
Be an engineer and sketch your system, scan it and post it here with pressure, flow, line size, distances etc marked on it. Or post the P & ID
From your posts my understanding is that there is an existing pump which has an inlet pressure of about 80 psig and an outlet of 500 to 800 psig as water injection. You're having problems on pump start. This sounds to me like there is no flow control to slow down the main injection pump? Is there any control valve between the pump discharge and the well head?
Please describe your system and how you start this pump.
The issue is probably that your injection pump is starting too fast and running off the end of the curve before the pressure from the well rises. By the way a pressure output range of 500 to 800 psig is a lot.
Maybe a PD type pump would be better.
I await more data with interest.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: water injection pump issue
RE: water injection pump issue
You haven't even mentioned a flowrate, although i imagine it is probably too large to consider a PD pump. What type of bearing arrangement would you like? What type mechanical seals would it require? Have you thought about materials of construction? Wear rings?
People on this forum are very knowledgeable and helpful, and I recommend you keep using it. For this problem however, you can make a very expensive "beginners mistake". Do the right thing: go call a Pro and let them make a selection for you and explain it to you at the same time.
RE: water injection pump issue
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: water injection pump issue
Are you saying you have a multistage injection pump with 80 psi suction / 500-800 psi discharge and 55 kW motor
That would be a fairly small flow
You won't get anywhere without a flow (pretty basic pump concept) plus inlet and discharge head of required duty
(what is booster pump suction pressure?)
Right now we do not have enough information to be helpful
RE: water injection pump issue
However given your limited knowledge I suggest you do NOT select a pump and present it to your boss as the solution.
Instead you could try running the online tool ; this will help you to familiarize with what type of input is needed by the guy who will select/size the pump for you but also you pick up a pump and go to its catalogue.
Big frustration from pumps application engineers is to see non consistent / incomplete data in a request for quote.
http://www.ksb.com/ksb-en/KSB-EasySelect/
You need to know the head, flow as minimum.
I also suggest to read upfront some basic theory of pumps
http://en.wikipedia.org/wiki/Centrifugal_pump
"If you want to acquire a knowledge or skill, read a book and practice the skill".
RE: water injection pump issue
720 psi is about 1660 ft differential head.
QxHxSG/(3960x.65) = 73.75 hp at about 114.4 USGPM with a pump efficiency of 0.65. (~26 m^3/hr).
That takes a standard 400 barrel tank from approximately full to approximately empty in somewhere between 2 and 2.5 hours.
I've seen more, I've seen less...anyway...
Taking 114.4 USGPM from say 9 psig to 80 psig (assuming a tank static head height of 20.79 ft) is 71 psi differential.
71 psi differential is about 163.7 ft. I like to be a bit left of BEP with a booster, so let's say the efficiency on the booster pump, somewhat left of BEP, is 50%, just to be conservative.
QxHxSG/(3960x0.5) = (114.4)(163.7)(1.0)/(3960)(0.5) = 9.5 hp
So, maybe get a 10 hp pump. As a check, assume you wanted to do this with one pump with an efficiency of 65%.
QxHxSG/(3960x0.65) = (114.4)(791*2.31)(1.0)/(3960x0.65) = 81.2 hp; you appear to have 73.75 hp (55 kW), so the 10 hp booster makes sense.
RE: water injection pump issue
really i appresiate for whole of you ,i make system layout to clarify the point ,please see the attach .
Br
Osama A. Nasher
RE: water injection pump issue
Your sketch doesn't really add much, apart from wondering why you have two sets of filters, but the key was in your previous post
This is to do with your starting sequence and how you control flow from the pump and has nothing to do with the booster pump.
Fix this problem first then worry about the pump later.
This is like having two cars which have the same maximum speed following each other. if at the traffic lights the first one is more powerful and sets off like a Grand Prix racer, then the second won't keep up and will fall behind. Both need to start more gently and move off together.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: water injection pump issue
I suspect the injection pumps have a design already known (for instance these pumps exist already) and may have high NPSH requirement so the booster pumps are added to satisfy the NPSH requirement of the pumps located downstream.
If it is the case then I would have a look at the performance curves of the injection pumps and starting from there I would define going backward what the requirement of the booster pumps are ...
But of course at this point, it is just guessing and speculating...
"If you want to acquire a knowledge or skill, read a book and practice the skill".
RE: water injection pump issue
Dears
Is there any website avilable can found any spare part required for any model of gensets???????
i am seeking for excell sheets for mention master mastinance plan for diesel generators and pumps in the process area .can some one help me to get this excell sheet
i am looking for your help ,is there pssible to give me any pdf , document explain the practical way to understand ASME standard and how we make practical calculation of Flanges rating , Gasket size and pipe size??
can i know the schedule require for greasing of bearings for motors and pumps when it is operate 24 hr per day and when it is shutdown for six month??
As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"
RE: water injection pump issue
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: water injection pump issue
RE: water injection pump issue
You posted in the right forum, we can do anything plus it comes F.O.C
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: water injection pump issue
As a chem eng/metallurgist the first part of any answer I give starts with "It Depends"
RE: water injection pump issue
RE: water injection pump issue
RE: water injection pump issue
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)