Restriction Orifice for Liquid Application

These may help, not my field.

Application of restriction orifice plates

Restriction orifice Standards for liquid or gas- liquid services...

Restricted Orifice Working... - Cheresources.com Community

Not enough information.Need temperature,pressure,allowable pressure drop across orifice,expansion coefficient of orifice,etc.

This is just a partial list of variables that must be considered.

Here is a link to an on line calculator that will help you:

https://instrumentationandcontrol.net/restriction-orifice-calculator-size.html

Maybe this will help...

If you know the mass flow rate and delta pressure, you should be able to plug into the formula below and solve for d. Note that β also depends on d, i.e. β=d/D.

From wiki Orifice Plate:

https://en.wikipedia.org/wiki/Orifice_plate

It can be found within Perry, "The Chemical Engineer's Handbook", any edition.

Like this.

As one of Lyn’s references mentions, Flow Measurement Engineering Handbook, by Richard W. Miller, has a very good section that explains the details of how to apply the formulas, sizing goals and other details as they may pertain to your installation. If you decide to purchase the orifice, the seller will size it for you, they will ask the right questions.

A little clarification,please.

Do you wish to measure the differential pressure across the restrictor,(Orifice plate) for measurement purposes,or simply reduce the flow to a lower arbitrary amount,as in a needle valve or to control the speed of action of a valve,to prevent sudden opening or closing?

This is two entirely different applications and require different approaches to give the desired result.

GA.

• Differential pressure across an orifice to measure flow is soooooo 1973. There are many simpler ways to measure flow these days depending on the details of the fluid, which the Original Poster has chosen to withhold from the forum.
• Reducing flow involves valves, which are really restriction orifices with knobs on.

True,orifice plates are old tech,but there are plenty of them around,still working fine.Not susceptible to electrical surges,spikes,lightning strikes,etc.

Pneumatic controls are not the go-to technology now for almost everything,it is an analog technology,but it cannot be beat for durability.

Some of the old technology is very accurate,and many digital transmitters use pneumatic primary sources that are converted.

In hazardous or very hostile environments, like high humidity,temp,radiation,they will work reliably when electronic devices fail.

Until recently,the Panama canal used the same pneumatic controls that were originally installed in 1914.

Pneumatics are still used in natural gas well heads because of the explosive nature of the product

I cut my eye teeth on pneumatic controls but I kept pace with the new technology,and learned digital controls,and had to program some of the controllers that had proprietary software,as well as having to learn Basic,Fortran,Cobol to remain competitive.

It is true that digital is better in many cases,but there is still a niche for pneumatics,and probably always will be.

Restriction orifice for minimum recirculation line of centrifugal pump that pumps water

The characteristics of the pump, size of the line and the flow rate need tying down to achieve a satisfactory reply. All that this line would do is waste some of the performance of the pump, which is probably oversized for the duty.

There has been a similar thread on CR4 recently. It’s worth looking at to see if there is illumination there.

Here it is.

One can still just switch it off when it’s not needed. Still saves a lot of farting around...

If all these posts are on the same <...Restriction Orifice...>, then a lot of time has been spent considering, whereas a decision and action would have saved many of these duplicate posts and acieved a result: in that time several different sizes of <...Restriction Orifice...> could have been tried to evaluate suitability.

• What does the Process Engineer have to say on this topic?
• What was the outcome from the HazOp Study?

The characteristics of the pump, size of the line and the flow rate need tying down to achieve a satisfactory reply. All that this line would do is waste some of the performance of the pump, which is probably oversized for the duty.

There has been a similar thread on CR4 recently. It’s worth looking at to see if there is illumination there.

I think I have a restriction plate calculation program in my PC, If you can send me the full details I'll see what I can offer.

Ian Purdie

Has your respondent found an answer to the restriction orifice plate. Shall I shut down my PC?