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 -

1669 views
Technical Discussions
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
20:22 May-25-2009
Stainless steel pre-penetrant etch

A vessel of 304 stainless has been garnet-blasted as preparation for painting. Dye penetrant is now required of the vessel shell. Any info about the effect of garnet blast on 304 (or similar) and which etchant should be used would be greatly appreciated.

Looking for external Chloride Induced SCC. Indications found on painted surface with Eddy Current which does not give any characterisation or depth info. Further investigation required for confirmation of these indications. Thinking of 45 degree shear wave from inside if access possible, if not 70 degree (no 80 degree or creep probe) from outside. Material 53mm thick.

Thanks

Nigel

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
17:07 Jun-15-2009
Re: Stainless steel pre-penetrant etch
In Reply to Nigel Armstrong at 20:22 May-25-2009 (Opening).

Hi All

For completeness, the vessel owners opted for internal encoded Phased Array 45 degree linear inspection of the outer near-surface areas already highlighted by eddy current. High amplitude crack-like responses were obtained plotting out as extremely close to the outer surface (1 to 10mm).

A susbsequent nital etch of those areas followed by a red solvent removable penetrant revealed strong indications, some of crack-like nature. I am back in the UK now, but I shall try to obtain images to post here.

 
 Reply 
 

Product Spotlight

32:128PR PAUT & 2-ch TOFD Flaw Detector: SyncScan 2

●32:128PR PAUT with optional 2-ch TOFD to maximize your efficiency ●Support PR mode for corrosi
...
on inspection ●Multiple solutions for welds & corrosion ●Faster scan speed (Approximately 3 meters/minute) ●Light weight: 4kg only including battery
>

Micro CT

nanoVoxel series has nano-scale resolution upto 500nm by using high voltage X-ray source (from 80-
...
300 kV) with micro/nano focal spot and highly sensitive flat panel detectors and unique Optical coupling detector.
>

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

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.
>

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