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Does Flowmeter Diameter Depend On Pipe Diameter?

09/30/2013 11:29 AM

I need to specify the flowmeters for several applications in a project. The client gives me the mass flow or volumetric flow (depending on the fluid), and I know the pipe diameter for each service from the piping diagrams.

Does the size of the flowmeter depend on the amount of flow that passes through or on the size of the related pipe?

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#1

Re: Does flowmeter diameter depend of pipe diameter?

09/30/2013 12:00 PM

Depends on the type of flow meter.

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#2
In reply to #1

Re: Does flowmeter diameter depend of pipe diameter?

09/30/2013 4:03 PM

So far I have listed:

(Fluid // Flowmeter type // Capacity)

Vegetable oil // Coriolis // 8500 kg/hour

Overheated steam // Vortex // 9000 kg/hour

Overheated steam // Vortex // 10000 kg/hour

Overheated steam // Vortex // 7000 kg/hour

Steam condensate // Coriolis // 5700 kg/hour

Steam condensate // Coriolis // 3500 kg/hour

Soft water // Coriolis // 0.9 m3/hour

Soft water // Coriolis // 35 m3/hour

Osmosis water // Coriolis // 21 m3/hour

Industrial compressed air (humid) // Vortex // 400 Nm3/hour

Industrial compressed air (humid) // Vortex // 800 Nm3/hour

Industrial compressed air (humid) // Vortex // 200 Nm3/hour

Instruments compressed air (dry) // Vortex // Casual use

Instruments compressed air (dry) // Vortex // 165 Nm3/hour

Instruments compressed air (dry) // Vortex // 200 Nm3/hour

Tap water // Pulses // 2.1 m3/hour

Tap water // Pulses // 1.3 m3/hour

Tap water // Pulses // 1.3 m3/hour

Waste water // Ultrasonic // 0.9 m3/hour

Waste water // Ultrasonic // 5.0 m3/hour

Waste water // Ultrasonic // 0.8 m3/hour

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#3
In reply to #2

Re: Does flowmeter diameter depend of pipe diameter?

09/30/2013 6:02 PM

Send this list to your vendor.

You may want to reconcile the weird units first, or let the guy who makes the commission on this sale do the math. That's not me.

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#6
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Re: Does flowmeter diameter depend of pipe diameter?

10/01/2013 9:19 AM

Now for each flow, apply the pipe radius squared and pi (the area), and you will have flow velocity - make a spreadsheet with all this on it, and let the vendors then guide you to the correct applications of the flow meters.

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#12
In reply to #2

Re: Does flowmeter diameter depend of pipe diameter?

11/06/2013 2:30 AM

DONN'T PUZZEL YOUR SELF JUST SEND ALL THIS INFORMATION TO THE VENDORS FROM THERE YOU WILL GET A GOOD IDEA,THE PIPE SIZE DIAMETER DOES GIVE YOU THE SIZE OF THE ORRIFICE PLATE FOR THE FLOW METER.

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#4

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

09/30/2013 11:41 PM

Mag flow meters measures velocity, then converts to flow after looking at pipe size.Depending on the make there is a min. and max. velocity.We have many applications were we reduce the size of the flow tube so we can get the extra velocity.

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#5

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/01/2013 3:08 AM

Asa always, a few telephone calls with equipment vendors soon sorts things out.

Telephone calls are brilliant! They are two-way. Interactive, in fact. One gleans such a lot of information in a very short time.

Unlike e-mail, which is impersonal, non-interactive, and ignorable.

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#7

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/01/2013 10:21 AM

Expanding on Eltech's comment:

Vortex and ultrasonic are velocity measurements so each has a minimum flow rate, in fact vortex has an inherent low flow cutoff point (nominally up to about 9-10% of full scale flow) where the flow is reported as zero flow.

It is very common to see vortex meters that are 1 or even 2 pipe sizes smaller than the line size in order to get sufficient velocity in the flow range of interest.

Headers for steam or air can be problematic at low demand/flow conditions because flow velocity in the header's larger pipe diameter can drop below the minimum that a vortex can sense (too few vortices over time to get an accurate reading.)

Vortex is also very fussy about flow profile with long straight meter runs of piping recommended.

Pressure drop can be a consideration when reducing the line size.

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#8

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/02/2013 8:59 AM

Where I work, we build many process skids per year with at least one flow meter on each. We ALWAYS let the manufacturer decide the size of the flow meter. The end size is usually smaller than the inlet/outlet piping, but we let them decide for us. It's their instrument and they know it best.

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#9

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/02/2013 11:14 AM

Ok, I already sent the list to the vendors, but I would like to know how to do the selection myself. Any books or articles on the subject?

All the books I have found talk about the inner works of the flowmeters, but don't provide selection guiding.

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#10
In reply to #9

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/02/2013 12:02 PM

the manufacturers have allot of info on this....... similar to the link I sent.

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#11
In reply to #9

Re: Does Flowmeter Diameter Depend On Pipe Diameter?

10/02/2013 10:06 PM

Bela Liptak's "Instrument Engineer's Handbook" on process measurement gives good advice on flowmeter selection. This is a must-have reference for any process control professional!

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