8 replies to this topic

[roy2377]

I need to calculate the flow rate of a pump but cannot find a way to do that.  I tried all equation but my supervisor told me its still wrong.

 

The fluid is HFO, heavy fuel ooil whereby, density = 942.6 kg/m^3, kinematic viscosity= 180cSt

 

Tank size that will contail HFO = 31 m3, diameter= 2.15m Length= 8.50m

 

Please can you help on that

 

Now I will also need to know the size of pipes that will be needed I guess.. but how should I proceed.

 

Any help or advice would be much appreciated.

 

Thanks

 

[katmar]

There is not nearly enough information in your problem statement to define the pump capacity.  Is the pump used to fill or empty this tank?  The pump capacity will be set by process requirements and not by an equation.  The pump capacity will be set in response to requirements like how quickly you need to fill the tank or what the HFO flow to the burners must be.

[roy2377]

Hi Katmar,

 

Thanks for the feedback.

 

I manage to sort out something.

 

I found that 1 kg/hr of Steam is produced by 0.0708 L/Hr HFO

 

My boiler need to produce 4 tonnes of Vapor/hour = 4000 kg/hr * (0.0708 L/hr / 1 kg/Hr)= 283.2 L/Hr (HFO)

 

I am placing an HFO Tank of capacity = 31 000 L = 31 m3

 

According to to the data I have above about 1 kg/hr of Steam is produced by 0.0708 L/Hr HFO, I manage to calculate the consumption of HFO for the boiler per day = 2500L/day

 

So 2500 L/day divide by 24 Hr = 104.2 L/Hr

 

My flow rate = 283.2 L/Hr - 104.2 L/Hr = 179 L/Hr

 

Does it make sense what do you think.

 

Many thanks again for the feedback and looking forward to hear from you.

[Pingue2008]

Roy2377,

 

You posted a couple of threads all related. I will suggest that you consolidate them so that all the insights by members can be in one place. here you are talking about steam as if we are mind readers. you attached a sort of PFD with the post (How to size my Service tank) but you failed to do so here. if it is a system (equipment interacting together) the members have to know). I just found out on this thread that the tank (service tank ) has already been sized (D=2.15m, L=8.50m).

 

Thank you,

[katmar]

You should take the advice given by Pingue2008 very seriously.  I like the way he has said you regard your audience as mind readers.  That is your real problem.  You need to develop the skill of being able to put yourself into your readers shoes, and re-read what you have written with their (lack of) background knowledge.  Until you are able to do that there is simply no communication.

[roy2377]

Thanks Katmar and Pingue2008, appreciate the advice

[roy2377]

@Pingue, the other thread is about the Service Tank, have a look at the picture posted, he I have already sized the main tank which is 31 m³, The service tank will be just after the pump which I have also manage to calculate without using anyone help from this forum I must say, so I am just building up...I hope I did made myself clear and appologise if I created some sort of confusion.

 

Tank (31m3) ------> PUMP (280 L/HR) -----> Service Tank (I am currently trying to work this based upon the figures I mentioned)

 

Thanks again for all your comment, really appreciate it.

 

Regards

Roy

[breizh]

Roy ,

Consider this extract of a book published by Jacques Chaurette ( available for free download ) using the search feature on this forum (top right) .

 

 

 

Breizh 

[roy2377]

Thanks a lot Breizh, appreciate the help, and yeah that book really helps.