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Differential Pressure Level Transmitter on Stand Pipe

05/26/2009 3:13 AM

I wonder wheather we can install Differential Pressure Level Transmitter on Stand pipe or it should be installed directlly on the tank?

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Guru
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#1

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 3:53 AM

What's in the tank?

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#2
In reply to #1

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:02 AM

oily water

crude oil

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#3

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:04 AM

oily water

crude oil

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Guru
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#4
In reply to #3

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:27 AM

What make and model of differential pressure transmitter?

Is there any need to isolate the instrument for replacement, calibration or maintenance?

What are the ambient temperature swings where the tank is located?

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#5
In reply to #4

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:41 AM

it is possible to install the transmitter on the stand pipe, I mean the model, temperature and other enviornmental conditions allow this type of installation. My question is that if it is common or technically true to install a differential pressure transmitter on the stand pipe or not. Because I have not seen such a thing yet.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#6
In reply to #5

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:46 AM

What are the ambient temperature swings where the tank is located?

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#7
In reply to #6

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 4:59 AM

Maximum ambient temperature: 55 ºC

Minimum ambient temperature: -2 ºC

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Guru
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#8
In reply to #7

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 5:47 AM

Then there is a risk of any small diameter impulse line freezing, which would seriously affect the reading from the instrument. The best solution, therefore, is to mount the transmitter directly on a low-level tank flange, and thermally insulate the connection heavily.

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#9
In reply to #8

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 6:02 AM

and if there was no risk of freezing, could we use a stand pipe?

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Guru
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#11
In reply to #9

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 8:33 AM

Not with a minimum ambient of -2degC.

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Guru
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#10
In reply to #8

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 8:01 AM

Concur. Fortunately, I've never had to contend with freezing temperatures here .

As a rule (my rules that is), I only use standpipes if the medium is a clean, low viscosity liquid. If the fluid has sediments or tends to stick, I'd stay away from standpipes as they will cause problems galore.

If you do use a standpipe, provide isolation valves between the pipe and the vessel. Provide a drain valve at the bottom and a cap at the top. This is to allow draining the standpipe for zeroing and cleaning.

Oh, and if the liquid is a food product, don't use a standpipe. The liquid in the standpipe may stay on the pipe wall and spoil, ruining the product.

regards,

Vulcan

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Guru
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#12
In reply to #10

Re: Differential Pressure Level Transmitter on Stand pipe

05/26/2009 8:33 AM

Quite.

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#13
In reply to #12

Re: Differential Pressure Level Transmitter on Stand pipe

05/27/2009 1:36 AM

thanks PWSlack and Vulcan! great help!

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