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 -

Hi-Spec Systems
Hi-Spec Systems are an innovative, forward thinking and fast moving non-destructive testing (NDT) technology company who specialise in the design ...

1368 views
Technical Discussions
Prasad
Director, NDT Consultant
Energy Workforce Group of Companies, Malaysia, Joined Aug 2003, 12

Prasad

Director, NDT Consultant
Energy Workforce Group of Companies,
Malaysia,
Joined Aug 2003
12
04:57 Oct-02-2006
Inspection underneath riser clamps

Gents,

Could any body suggest a suitable NDT method for the inspection of offshore risers underneath riser clamps?

I would much appreciate your comments on the "applicability of LRUT technique" for such inspections.

Thanks,

Prasad



    
 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 298

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
298
08:16 Oct-02-2006
Re: Inspection underneath riser clamps
----------- Start Original Message -----------
: Gents,
: Could any body suggest a suitable NDT method for the inspection of offshore risers underneath riser clamps?
: I would much appreciate your comments on the "applicability of LRUT technique" for such inspections.
: Thanks,
: Prasad
------------ End Original Message ------------
Dear Prasad,
It is good to be in contact with you again.
You will be aware that NDT Consultants in the UK market the SwRI MsS Long Range UT system.
Your Alex (from Velosi) saw our system in use in Kuwait earlier this year, and whilst we were there, we were sucessful in detecting CREVICE CORROSION under clamps on gas lines with the equipment. This was confirmed in each case by removal of the clamps and manual UT of the area (but in some cases, manual UT was not necessary because of the extent of the corrosion being clearly visible).
We have no experience on risers, but because we use Torsional Waves, there should be no leakage of waves into product (as you will get with Longitudinal waves), and therefore we expect this to be very possible.
Please contact me for more information, or else speak with Alex.

Godfrey Hands




    
 
 Reply 
 
Paul Robertson
,
Netherlands, Joined Jun 2003, 12

Paul Robertson

,
Netherlands,
Joined Jun 2003
12
01:37 Oct-08-2006
Re: Inspection underneath riser clamps
Dear Prasad,

An important factor that would contribute to the success or otherwise of LRUT inspection is the means by which the clamp is attached to the riser. Do the risers have a neoprene (or similar) insert between clamp and riser wall - if so that should help the technique as there is no metal to metal interface for leakage (irrespective of whether torsional or longitudinal waveform is applied).
If your product is gas then Longitudinal waveforms will not 'leak' into the product - this is only a possible effect on liquid filled lines. There is certainly at least one manufacturer that provides both Longitudinal and Torsional combined in the same tool as default.
In any case a full technical appraisal should be made to determine inspectability and also establish what level of sensitivity you expect from this particular application.

Regards
Paul.


    
 
 Reply 
 

Product Spotlight

Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge

The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu
...
res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections.
>

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.
>

CIVA 2017 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

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