This article is about Transit time & Doppler Ultrasonic Meters Material Selection Criteria Design For Flow Measurement of Instrumentation and Control Systems as per International Codes and standards for Commercial Buildings, Plants and Refinery Projects.
Transit time & Doppler Ultrasonic Meters Material Selection Criteria Design
Material Receiving General Checklist for Instrumentation & Control
General Requirements
Purchase Order and Instrument specification sheet criteria shall be confirmed and compared with instrument stainless steel tags / labels and nameplates, all possible visual checks and shipment checked for damage, prior to acceptance of the shipment
Verify that all the instruments are from technically acceptable vendors, Attachment 1
Meters must be matched with fluid, and fluid properties must be consistent. (PIP PCEFL001 Sec. 4.14.2)
Straight piping runs are required. (PIP PCEFL001 Sec. 4.14.2)
Material Inspection – Transit Time
The fluid flow should be fully turbulent and clean. (PIP PCEFL001 Sec. 4.15.1)
Meters with cavities (recesses for transducers) should not be used if a significant amount of solids in liquids , or liquids or solids in gases, is present. Manufacturer to be consulted for suitability and signal degradation effects. (PIP PCEFL001 Sec. 4.15.2)
If it is not possible to shut down a line to install a meter, strap-on type meters may be used. The sensors should have solid acoustic contact with the pipe wall through the use of conducting grease or material. Pipe wall thickness information is required data. (PIP PCEFL001 Sec. 4.15.3)
Utrasonic transit-time meters should not be used on piping systems that generate noise upstream of the meter. Ultrasonic transit-time meters perform best on “acoustically quiet” installations. (PIP PCEFL001 Sec. 4.15.4)
Ultrasonic transit-time meters should not be used on lined pipe and may not work properly on thick walled pipe. (PIP PCEFL001 Sec. 4.15.5)
Material Inspection – Doppler
Ultrasonic Doppler meters should be used only in fluids that always contain acoustically reflective medium, e.g.; particulate or bubbles homogeneously dispersed. (PIP PCEFL001 Sec. 4.16)
International Codes and Standards for Transit time & Doppler Ultrasonic Meters
- Flow Nozzle Material Selection Criteria Design & Flow Measurement
- Venturi Tube Material Selection Criteria Design & Flow Measurement
3. SAES-J-002 – Technically acceptable instruments, 23 June 2008
4. SAES-J-003 – Instrumentation Basic Design, 16 January 2008
5. SAES-J-100 – Process Flow Metering, 05 April 2008
6. PIP PCCFL 001 – Flow Measurement Criteria , August 2006, Process Industry Practices Process Control,
7. PIP PCEFL 001 – Flow Measurement Guidelines , August 2006, Process Industry Practices Process Control
Attachment 1: Technically Acceptable Instruments, SAES-J-002
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