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DPCNews 027 - Definitions for ISO 12706:2009 Standard

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Written by Administrator
Sunday, 01 August 2010 14:08

Suggested definitions of some PT terms left out of the ISO 12706:2009 Standard

August 2010
Document updated in November 2012

In our paper titled "ISO 12706:2009 standard: Missed opportunities"’ published on our Website, we displayed some PT terms which we have not found in this standard.

As a 9-year time span was necessary since the ISO 12706:2000 standard revision, it is not yet too late to begin to think about  the next ISO 12706:2009 standard revision which, let us hope, will be published before 2018!

Please find underneath definitions we suggest for different terms.

TERMS IN ENGLISH/FRENCH

DEFINITIONS IN ENGLISH

Blue haze/Brouillard bleu

Shady view due to the fluorescence emitted by organic molecules in the vitreous humour of the eye under the influence of UV-A if UV blocking goggles are not worn.

Combined radiometer-luxmeter/Combiné radiomètre-luxmètre

Digital meter used to measure both the (UV-A or blue light) irradiance and the (visible light) illuminance.

Contrast/Contraste

Ratio between the illuminance given by a discontinuity indication and that by the surrounding background.

Cut-off wavelength - Cut-off/Coupure

Frequency or wavelength where the measurement efficiency of an instrument device drops below a specified value, close to zero, under defined conditions.
Also, frequency or wavelength where a physical parameter (often a sound, a light, an electric signal) has dropped by √2/2 .

Digital luxmeter/Luxmètre numérique

Digital meter used to measure the (visible light) illuminance.

Digital radiometer/Radiomètre numérique

Digital meter used to measure the (UV-A or blue light) irradiance.

Doubt removal - Synonyms: Wipe-off technique, Bleed back, Rebleed/Levée de doute

With fluorescent penetrants, this process is intended to check and to interpret indications beyond criteria. Wipe off the indication smoothly using a soft paintbrush or a swab lightly moistened with a volatile solvent such as acetone. After solvent evaporation, the non-aqueous wet developer is applied if linear indications are seen (or not applied when non linear indications are seen). If, within two minutes, the indication reappears, under ultraviolet radiation, the discontinuity is confirmed.

Dust storm cabinet/Compartiment pour brouillard de révélateur sec

Tank, which can be of large dimensions, in which the dry developer is moved by an appropriate means (compressed air or preferably by one or several vertical-axis fans placed at the tank bottom).

Fluorescent transparent comparator/Comparateur d’indications fluorescentes

Transparent stiff plastic ruler containing drawings of geometrical shapes (lines, circles, etc.) of generally green colour in visible light and fluorescent under UV-A radiation allowing for assessing the dimensions of indications.

Full width spectral at half maximum (FWSHM)/Largeur spectrale à mi-hauteur (LSMH)

Band width of wavelengths for which the irradiance or the illuminance (as appropriate) is at 50% of the peak value.

Hand held refractometer/Réfractomètre à main

Equipment used in penetrant testing to measure and to check the concentration of either an hydrophilic emulsifier in water or a water-base penetrant in water.

High temperature penetrant/Pénétrant haute température

Penetrant used to perform penetrant testing at temperatures between 100 and 200°C (212-312°F).

High temperature developer/Révélateur haute température

Developer used to perform penetrant testing at temperatures between 100 and 200°C (212-312°F).

High temperature penetrant remover/Nettoyant haute température

Cleaner used to perform penetrant testing at temperatures between 100 and 200°C (212-312°F).

Low temperature developer/Révélateur basse température

Non-aqueous wet developer used to perform penetrant testing at temperatures lower than 10°C (50°F).

Low temperature penetrant/Pénétrant basse température

Penetrant used to perform penetrant testing at temperatures lower than 10°C (50°F).

Low temperature solvent remover/Nettoyant basse température

Volatile solvent used to perform penetrant testing at temperatures lower than 10°C (50°F).

Medium temperature penetrant/Pénétrant medium température

Penetrant used to perform penetrant testing at temperatures between 50 and100°C (122-212°F).

Medium temperature developer/Révélateur haute température

Developer used to perform penetrant testing at temperatures between 50 and 100°C (122-212°F).

Oil-based penetrant/Pénétrant à support pétrolier

Penetrant based on organic compounds (hydrocarbons, oils, surface active agents, dyes, etc.)

Overshoot/Dépassement de la consigne de température

Maximum temperature set point overrun in an oven, even if free of any parts to be dried.

Overwashing/Surlavage

Unreasonable removal of the excess of penetrant from the test surface leading to a partial or complete penetrant removal from discontinuities. This is generally due to a too long washing time or to a too high washing water pressure.

Reference photography baseline - Reference picture baseline/Photographie initiale de référence

Photograph taken on BRAND NEW reference test block or panel.
This photograph will be the ONLY one used for all the lifetime of this reference test block or panel.

Through-leak penetrant testing/Ressuage traversant

A leak tightness testing (LT) technique in which the penetrant is applied on one face or surface of a part, for instance the inner surface, while the developer, if any, is applied on the other face or surface, for instance the outer surface. Inspection is carried out on the surface on which no penetrant has been applied.

UV-A or blue light source/Projecteur UV-A ou de lumière bleue

Source of UV-A radiation or of blue light.

UV-A overhead source/Plafonnier UV-A

UV-A source secured to the ceiling or overhanging the inspection area.

(UV-A or blue light) irradiance/Éclairement énergétique (UV-A ou de lumière bleue)

Power of (UV-A or blue light) electromagnetic radiation received by surface area unit to be inspected.

(Visible light) illuminance/Éclairement lumineux (lumière visible)

Quantity of (visible light) luminous flux received per surface area unit to be inspected.

Water rinse/Rinçage à l’eau

Removal with water of most of the excess of the post-emulsifiable penetrant from the test surface before application of the hydrophilic emulsifier.

Water wash/Lavage à l’eau

Removal with water of the excess of the water-washable penetrant or removal of the post-emulsifiable penetrant after emulsification.

Water-based penetrant/Pénétrant à support aqueux

An aqueous solution designed as a penetrant.

Wood's glass filter/Filtre de Wood

UV-B and UV–C blocking filter letting violet and infrared radiations pass through along with UV-A radiation.

Of course this list is not all-comprehensive and it will be updated when needed.
We hope that the Technical Group in charge of the ISO 12706:2009 standard revision will eventually consider our suggestions.

Reference

• ISO 12706:2000 Non-destructive testing - Terminology - Terms used in penetrant testing, International Organization for Standardization, Geneva, Switzerland, 2000.

• ISO 12706:2009 Non-destructive testing - Penetrant testing - Vocabulary, International Organization for Standardization, Geneva, Switzerland, 2009.


We, Pierre CHEMIN and Patrick DUBOSC, welcome any comment, any idea. If you have some examples you would like to see discussed here, please give us all the useful indications. If you require confidentially, we would modify locations, names and some parameters to prevent any traceability.
Nevertheless, we are convinced that our site may be a kind of surge-valve: the topic is NOT to target this company, or that auditor; but it is always to make users think, to make them ask themselves, or others, the right questions.

We may also give advice, once again on a confidential basis if needed: please, feel free to ask questions, to document our data basis: about Material Safety Data Sheets (MSDS), about environment, a chemical name you don't understand, a Penetrant process you have heard about, etc.
We have plenty of examples, some being out of all the specifications/standards, which led to the discontinuities detection, when the "current, normal, processes" prevented discontinuity finding.

Last Updated ( Thursday, 13 June 2013 16:44 )