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 -

723 views
Technical Discussions
Ajit
Engineering, Inspector
V.J.T.I., India, Joined Feb 2009, 8

Ajit

Engineering, Inspector
V.J.T.I.,
India,
Joined Feb 2009
8
08:58 Feb-24-2009
Paint thk.

Sir,
Once, I was measuring paint DFT for CS storage tank ( 2 coat epoxy). As I was not having paint specification , it was difficult to do the inspection. What should b the acceptance citeria i.e. min. DFT for painting if no specification ?
Regds

    
 
 
Roger Duwe
Roger Duwe
13:51 Feb-24-2009
Re: Paint thk.
In Reply to Ajit at 08:58 Feb-24-2009 (Opening).

A typical 'generic' paint spec is .004" 'anchor profile' [sand blast depth], 1 - 2 mils [.001" - .002"] of primer, 2 - 4 mils for each layer of topcoat. Thus a 2-coat epoxy system should be 3 mils, minimum.

If this wasn't written into the contract, specification, or on the drawing, it will be impossible to enforce.

    
 
 
Oscar D
NDT Inspector, engineering and consulting
Global CSIS, Ireland, Joined Feb 2009, 1

Oscar D

NDT Inspector, engineering and consulting
Global CSIS,
Ireland,
Joined Feb 2009
1
14:55 Feb-25-2009
Re: Paint thk.
In Reply to Roger Duwe at 13:51 Feb-24-2009 .

Ajit,

Although Roger is right in saying that you can't enforce anything without a specification, the figures he gave you for anchor profile and coating thickness are incorrect.
Anchor profile of .004" (100 microns) seems very high unless high build solvent free epoxies or GF vinyl esters are applied. 50-75 microns Rz would be a more typical anchor profile for thin film epoxy systems.
For 2 coats of epoxy inside a storage tank, I wouldn't be happy with anything less than 10 mils (250 microns) of film thickness. Although it can vary quite a bit per depending on the coating product and the preference of the different coating manufacturers, 2 coat epoxy systems for immersion are usually specified at 150 - 300 microns per coat.

Your best bet is to ask the coating manufacturer for guidance.

    
 
 

Product Spotlight

HD-CR 35 NDT Computed Radiography System

Portable high-resolution CR scanner for all radiography applications - weld testing, profile images
...
and aerospace. No matter what type of radiographic testing you are performing, the unique TreFoc Technology of the HD-CR 35 NDT imaging plate scanner always guarantees the highest image quality.
>

IRIS 9000Plus - Introducing the next generation of heat exchanger inspection.

Representing the seventh generation of the IRIS system, the IRIS 9000 Plus has nearly 200 years of c
...
ombined field inspection experience incorporated in its design. This experience combined with a strong commitment to quality and a history of innovation has made Iris Inspection Services® the undisputed leader in IRIS technology.
>

IntraPhase Athena Phased Array System

The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha
...
sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION.
>

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

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