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 -

NDTSS - Non Destructive Testing Society of Singapore
Visit us at SINCE 2019

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


Engineering, Inspector
Joined Feb 2009
08:58 Feb-24-2009
Paint thk.

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 ?

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,
Joined Feb 2009
14:55 Feb-25-2009
Re: Paint thk.
In Reply to Roger Duwe at 13:51 Feb-24-2009 .


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

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.


The EPOCH 6LT flaw detector is optimized for one-handed operation in rope access and high-portab
ility applications. Lightweight with a grip-oriented weight distribution, the instrument fits securely in a user’s hand or can be strapped to their leg using the rope access accessory kit. The clear, bright screen makes A-scans readable in any light while the intuitive software enables fast navigation.

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

Digital Radiography for Concrete Inspection

In the construction industry (buildings, bridges) there is a need for fast non- destructive means,
most commonly to locate targets (Pipes, Re-bars, Conduit, Fittings etc.) within concrete structures prior to drilling, cutting or coring. Measuring reinforcements is also performed for static calculations and to detect corrosion problems and damages. Cracks and voids can also be visualized. The examinations are not only restricted to concrete constructions; they can also be applied to reinforced masonry made of natural stones or bricks.

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