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 -

ULTRASOUND INSTITUTE
The Ultrasound Institute can develop new advanced ultrasonic measurement, imaging and NDT techniques for non-conventional applications.

1306 views
Technical Discussions
Collin Maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

Collin Maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
04:50 Feb-10-2008
Fireside Tubesheet Inspection

We have waste heat boilers with 12m long horizontal tubes 78mm dia x 6mm wt expanded and seal welded between tube sheets - hot side / cold side. The hot side tube sheet is refractory clad with a ceramic insert in the tubes.
Our RBI requires that we conduct inspection.
What would be the best NDT method to locate cracking at tube to tubesheet junction, and corrosion / erosion of the tubes.
There is access only from the tube I.D. and tubesheet face on the cold side.


    
 
 
ranjeet singh
Engineering, Asst.Manager-Condition Monitoring
TATA chemicals ltd.(fertilizer div.), India, Joined May 2006, 6

ranjeet singh

Engineering, Asst.Manager-Condition Monitoring
TATA chemicals ltd.(fertilizer div.),
India,
Joined May 2006
6
04:57 Feb-12-2008
Re: Fireside Tubesheet Inspection
Mr.Collin Maloney ,
for tube corossion and erosion ,you may select tube inspection technique like RFET or IRIS
For knowing health of ferrule or tube ID surface you may go for Fiberscopy/boroscope
for ascertaining health of TTS joint ,go for Helium leak testing if possible else do DPT or visual inspection.

Regards

----------- Start Original Message -----------
: We have waste heat boilers with 12m long horizontal tubes 78mm dia x 6mm wt expanded and seal welded between tube sheets - hot side / cold side. The hot side tube sheet is refractory clad with a ceramic insert in the tubes.
: Our RBI requires that we conduct inspection.
: What would be the best NDT method to locate cracking at tube to tubesheet junction, and corrosion / erosion of the tubes.
: There is access only from the tube I.D. and tubesheet face on the cold side.
------------ End Original Message ------------




    
 
 
Kåre Johansson
Kåre Johansson
09:49 Feb-12-2008
Re: Fireside Tubesheet Inspection
----------- Start Original Message -----------
We have a simillar challenge on our plant and have found a cobination of methodes to be the most effective.

As mentioned by the previous reply some ET techniques will work well, discuss the details with a good inspection company and provide as many details as possible. IRIS will work, but I am sceptical unless you can guarantee against damage to the refractory and ferrules.

We have good experience using video techniques, including laser meassurements of roundness/deformation of the tubes.

Leak testing of the seal welds is a good idea, but then you must have some access to the shell side of the bundle and this wil probably not tell you much about the welds on the hot face. If you have access on the shell side og the tubes I would reccommend you try to do a video inspection on the tubes as close to the hot face as possible. There must be some drain in the shell?

PT/MT and visual inspection of accessible welds is natural if you have seal weld. As you are inside a vesel I would prefere flurorecent techniques. Again you have the problem of lack of access to the hot face.

In my experience all troubles with this type of boilers originate on the waterside. Your best bet is to enforce a VERY STRICT water chemistry.
regards
Kåre Johansson

: Mr.Collin Maloney ,
: for tube corossion and erosion ,you may select tube inspection technique like RFET or IRIS
: For knowing health of ferrule or tube ID surface you may go for Fiberscopy/boroscope
: for ascertaining health of TTS joint ,go for Helium leak testing if possible else do DPT or visual inspection.
: Regards
: : We have waste heat boilers with 12m long horizontal tubes 78mm dia x 6mm wt expanded and seal welded between tube sheets - hot side / cold side. The hot side tube sheet is refractory clad with a ceramic insert in the tubes.
: : Our RBI requires that we conduct inspection.
: : What would be the best NDT method to locate cracking at tube to tubesheet junction, and corrosion / erosion of the tubes.
: : There is access only from the tube I.D. and tubesheet face on the cold side.
------------ End Original Message ------------




    
 
 
Tony McMurtry
Tony McMurtry
20:10 Mar-01-2009
Re: Fireside Tubesheet Inspection
In Reply to Kåre Johansson at 09:49 Feb-12-2008 .

While water management can be a problem using IRIS around refactory, a little prior planning can keep the problem under control. Internal/external erosion/corrosion can best be identified and quantified with the IRIS unit. IRIS cannot determine if cracking is
present. The inserts would prevent the tube areas beneath from being properly inspected.

    
 
 

Product Spotlight

TESTD-PT SYSTEM

Pulse thermography is a non-contact test method that is ideal for the characterization of thin fil
...
ms and coatings or the detection of defects. With a remarquable short test time and a high detection sensitivity, the Telops TESTD-PT is the perfect tool for non- destructive testing. With such high frame rates, it is even possible to investigate highly conductive or diffusive materials.
>

Immersion systems

ScanMaster ultrasonic immersion systems are designed for high throughput, multi shift operation in a
...
n industrial or lab environment. These fully integrated systems provide various scanning configurations and incorporate conventional and phased arrays technologies to support diverse applications, such as inspection of disks, bars, shafts, billets and plates. All of ScanMaster immersion systems are built from high accuracy scanning frames allowing for scanning of complex parts and include a multi-channel ultrasonic instrument with exceptional performance. The systems are approved by all major manufacturers for C-scan inspection of jet engine forged discs. Together with a comprehensive set of software modules these flexible series of systems provide the customer with the best price performance solutions.
>

Ultrasonic tomograph for imaging of concrete structures А1040 MIRA

Applicable for concrete inspection allowing imaging of the internal structure of objects from conc
...
rete, reinforced concrete, different stones. The operation applies pulse-echo technique at one-side access to the object. The instrument is feasible for concrete inspection for searching conduct ducts, conduits, detection of foreign inclusions, holes, honeycombing, cracks and other concrete defects.
>

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.
>

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