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September 24, 2018
Tasnee Compressed Air Demo Report
September 24, 2018

Tasnee Value Inspection Report

Date 16 February 2018

 

 

Tasnee Plant. Jubail, Saudi Arabia.

 

 

Subject: Ultrasound onsite demo measurements report

Dear Sir,

We are pleased to enclose our Ultrasound measurements report.

The report includes the demo measurements done at your site and our recommendations.

Should you require any clarification you are welcome to contact us.

Finally, we would like to thank all maintenance staff who offered all the support needed for preparing this report.

 

 

Sincerely yours, Ahmed Moataz

 

 

 

 

Index

                                                                                               _

 

 

 

Subject                                                                                                         Page

VALVE INSPECTION INTRODUCTION                                                                  3

VALVE INSPECTION METHODS                                                                          4

DC 4000 DV, XV 40022 DISCHARGE VALVE REACTOR INSPECTION                        5

DC 4000 DV, XV 40024 DISCHARGE VALVE REACTOR INSPECTION                        6

DC 5000 DV, XV 50024 DISCHARGE VALVE REACTOR INSPECTION                        7

DC 5000 DV, XV 50022 DISCHARGE VALVE REACTOR INSPECTION                        8

DC 3000 DV, XV 30022 DISCHARGE VALVE REACTOR INSPECTION                        9

DC 2000 DV, XV 20022 DISCHARGE VALVE REACTOR INSPECTION                       10

DC 2000 DV, XV 420024 DISCHARGE VALVE REACTOR INSPECTION                     11

CONCLUSION                                                                                                                                11

 

 

VALVE INSPECTION

How Ultrasonic Valve Leak Detection Works

As fluid moves from the high pressure side of a valve through the seat to the low pressure side, it produces turbulence. This turbulence generates ultrasound which is detected by the Ultraprobe  and  translated, via heterodyning, down into the audible range. The translated ultrasounds are heard through headphones and seen as intensity increments, usually decibels on a display panel.

 

 

 

 

Leak Detection Method

Inspection methods vary depending on the type of valve. Therefore the primary rule is to know the details of your system, including the way a specific valve may work under specific conditions. For example, is the valve normally open or normally closed? In order to determine valve condition such as leakage or blockage: touch two test points upstream of the valve (points A and B). On the first  test point (test point “A”) reduce

the sensitivity (received amplitude) of the instrument until the intensity indicator on the   display panel reads about 50% of scale. If the instrument has frequency tuning, you may   also use this feature to hear the valve sound quality more clearly by changing the frequency. Simply tune the frequency (usually 25 kHz) until the sound you would expect to hear  becomes clear. It’s that simple.

Next, touch two test points downstream of the valve (points C and D) and compare intens ity levels. If the sound is louder when comparing the first downstream (C) with the second upstream test point (B), the fluid might well be is passing through. If the compared downstream sound level is low, the valve is closed. If the second downstream tes t point (D)  is louder than the first downstream test point (C), this indicates the sound is transferred from  a source further downstream and indicates the valve may not be leaking. Ultrasonic valve inspection is considered a “positive” test in that an operator can instantly identify sound quality and intensity differentials and thereby determine operating condition accurately.

Sound analysis can also be used to indicate the amplitude and movement of fluid between the upstream and downstream test points.

 

 

 

VALVE INSPECTION METHODS:

 

Inspecting valves for leakage, four points of measurement taken for comparison:

 

 

Example 1: If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

Example 2: If readings (A) and (B) are equal, but reading (C) is higher and the readings (D) and (E) are lower, then the valve is leaking or failed. We can make this conclusion because reading (C) is higher.

 

 

Example 3: If reading (A) and (B) are equal and reading (C) is higher, but reading (D) is higher than (C) and reading (E&F) are even higher, then the ultrasound is being generated from a source downstream of reading (E&F). Because the readings are increasing, ultrasound is very directional.

 

 

 

DC 4000 DV, XV 40022 DISCHARGE VALVE REACTOR INSPECTION:

 

The reading above taken from the inspected valve was the same as Example (2):

 

If readings (A) and (B) are equal, but reading (C) is highest and the readings (D) is lower, then the valve is leaking.

We can make this conclusion because reading (C) is the highest point

 

 

DC 4000 DV, XV 40024 DISCHARGE VALVE REACTOR INSPECTION:

 

 

 

 

The reading above taken from the inspected valve was the same as Example (1):

 

If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

 

 

 

DC 5000 DV, XV 50024 DISCHARGE VALVE REACTOR INSPECTION:

 

 

The reading above taken from the inspected valve was the same as Example (1):

 

If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

 

DC 5000 DV, XV 50022 DISCHARGE VALVE REACTOR INSPECTION:

 

 

 

The reading above taken from the inspected valve was the same as Example (1):

 

If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

 

DC 3000 DV, XV 30022 DISCHARGE VALVE REACTOR INSPECTION:

 

The reading above taken from the inspected valve was the same as Example (2):

 

If readings (A) and (B) are equal, but reading (C) is highest and the readings (D) is lower, then the valve is leaking.

We can make this conclusion because reading (C) is the highest point.

 

 

 

 

DC 2000 DV, XV 20022 DISCHARGE VALVE REACTOR INSPECTION:

 

 

The reading above taken from the inspected valve was the same as Example (1):

 

If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

DC 2000 DV, XV 20024 DISCHARGE VALVE REACTOR INSPECTION:

 

 

The reading above taken from the inspected valve was the same as Example (1):

 

If points (A), (B), (C), (D), and (E) are close to being equal or the sound attenuates from (A) to (D), then the valve is closed totally and not leaking. Ultrasound is created by a gas or fluid passing through a restriction and there is no turbulence generated at point (C).

 

 

 

 

CONCLUSION:

To Determine whether a valve is leaking in closed condition, simply listen to the valve and determine if there is turbulent flow. For leak detection  use the ABCD method to confirm your diagnoses.

 

NOW YOU CAN inspect your valves accurately and fast using UE SYSTEMS Ultraprobes.