Home » Why RTD installed after the Orifice Plate ?
Temperature Measurement

Why RTD installed after the Orifice Plate ?

The location of the RTD (thermowell), positioned downstream of the orifice plate so the turbulence it generates will not create additional turbulence at the orifice plate. The American Gas Association (AGA) allows for upstream placement of the thermowell, but only if located at least three feet upstream of a flow conditioner.

A major reason for this is von K´arm´an vortex shedding caused by the gas having to flow around the width of the thermowell. The “street” of vortices shed by the thermowell will cause serious pressure fluctuations at the orifice plate unless mitigated by a flow conditioner, or by locating the thermowell downstream so that the vortices do not reach the orifice.

Also Read : Thermowell Case-Study

Similar Articles:

Related Articles

Applications of Temperature Scanner

S Bharadwaj Reddy

Thermocouple Extension Wires

S Bharadwaj Reddy

Temperature Calibration Bath Principle

S Bharadwaj Reddy

What is RTD Accuracy ?

S Bharadwaj Reddy

Thermocouple Construction

S Bharadwaj Reddy

What is Thermowell and How-to choose Thermowell Probe Length ?

S Bharadwaj Reddy

2 comments

Joseph May 24, 2018 at 5:24 pm

Please I need an installation hook-up procedure for interface shutdown signals between the Robershall panel and Safety System in control room. We need to install pressure switch and solenoid valve . it is to be configured in such a way that if the there fire in gas plant ESD will be initiated to shutdown the Flowstation and verse versa

Reply
islom November 10, 2018 at 10:20 pm

which conditions can we use fromRTDs? Please give me full informations about this!!!!!!!

Reply

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

WordPress Image Lightbox