where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
768 views
Career Discussions
Mark
Mark
01:36 Jun-01-2005
How much UT to perform

What is the best practice for amount of UTs that SHOULD be performed on vessels, heat exchangers, ect... when performing API-510 inspections? I see a lot of plants that institute programs. Some are better than others. Same goes for inspection companies. What should be the minimum? Is there a Maximum?

Also. How easy is it to miss potential corrosion defects performing B-scan UT. Is there a normal grid size? What's a good practice?


 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
01:35 Jun-02-2005
Re: How much UT to perform
There is no maximum or minimum API 510 is written in order that you consider the expected damage mechanisms and then select an inspection coverage considered effective to detect that damage. This is all part of inspection effectiveness. At general corrosion areas with slow corrosion rates you may make few measurements at long periods. On high corrosion rates with localised damage lots of coverage frequently.

This is all about thinking about damage before you inspect and tailoring what you do to that mechanism then amending as and when you have a firm grasp of what may be happening.

If you are working to API 510 you should have an API 510 Certified Inspector and he should understand the need to do this in consultation with a Pressure Vessel Engineer and Corrosion Specialist.




 
 Reply 
 
Mark
Mark
09:44 Jun-03-2005
Re: How much UT to perform

I guess that also wanted to get some input on how much UT to perform if you go to a site that has no history on a piece of equipment.
Example; Inspector goes to a site that has had a vessel in service for 30 years. For what ever reason, site wants to perform a API-510 inspection on the piece of equipment. The site does not have a engineering department or corrosion expert. (Small company.) And also does not open equipment for an internal inspection. If questions are asked about vessel history, answer is no problems.

I understand that it might be to the advantage of the API inspector to perform more UT to be able to get a better insite as to internal condition of the equipment. Is there a reasonable amount that would conform to good inspection practices, or would it be out of line for the inspector to recommend or request a 100% B-scan of the entire vessel? Depending on the amount, will the inspector be able to conclude any condition that might be taking place internaly?



 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
05:12 Jun-07-2005
Re: How much UT to perform
There will never be a formal answer to this due to the fact that the degree of coverage is related to the anticipated damage mechanism. If for example you expected Microbiological Induced Corrosion (MIC) it occurs as very samll diameter localised pits. Therefore you may require 100% scanning. Maybe you scan with low resolution MFL to identify area fast then profile specific areas with UT.

Is this reasonable or cost effective. Deopends upon the consequemces, high flammable, high toxic product in the middle of a $1 Billion Plant the answer may be yes. Water vessel, in a remote tank farm possibly not.

Ultimately the 510 Inspector is responsible to the owner to bring these issues to the owners attention. if the owner wants to accept the risk thats his call.


 
 Reply 
 

Product Spotlight

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

Panther

M2M PANTHER is a phased-array equipment designed for both desktop and industrial applications, offer
...
ing unparalleled performance in a compact unit. It combines the speed required for industrial integrated Phased-Array Ultrasound (PAUT) solutions, with the most complete set of total focusing method (TFM) imaging techniques, making it the ultimate tool for R&D and procedure qualification.
>

Robotic laser shearography enables 100% inspection of complex, flight-critical composite structures

An article in “Composites World Magazine” showcases Non Destructive Testing of aero-structures
...
with Laser Shearography. Over the years Dantec Dynamics has supplied many solutions for the aerospace industry. Referring to specific customer projects several of these cases are examined to outline the advantages of using Laser Shearography for automated defect detection.
>

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window