AS ISO 3452.4 pdf download

AS ISO 3452.4 pdf download.Non-destructive testing — Penetrant testing
5  Equipment for fixed installations
5.1  General requirements All materials of construction used for the manufacture of fixed penetrant inspection installations, e. g. tanks, pipework and ducting, shall be manufactured from materials which are resistant to attack by the products used throughout the complete process. In addition, these materials shall not cause any modification to the properties of the penetrant systems used. Penetrant installations shall be located in an area where there is no possibility of contamination of the working solutions from external sources, e. g. leaks from overhead steam pipes. In addition penetrant tanks should be fitted with lids which should be kept shut when the plant is not in use. Where plants are fitted with effluent treatment or water recirculating systems, the system shall be designed to ensure that any water discharged to waste meets local discharge requirements. In addition the recycled water shall be of a quality suitable for rinsing components. Where extraction systems are fitted, e. g. with spray application of penetrant, they shall be designed such that the local health and safety requirements relevant to operational safety and local air emission laws are fully met. All chemicals used in penetrant testing shall be stored in closed containers and storage shall meet relevant health and safety requirements.5.2  Preparation and precleaning area Suitable equipment shall be used to carry out the preparation and precleaning requirements described in EN 571-1. Degreasing areas shall be equipped to ensure degreasing of the components in accordance with preparation and precleaning requirements described in EN 571-1 and if necessary shall include an area for cooling the components prior to the application of penetrant. The degreasing and cooling facilities shall be of adequate size to handle the flow of components. Vapour degreasers using halogenated hydrocarbons shall meet relevant air pollution requirements. 5.3  Penetrant application area Penetrant application areas shall have the facilities for applying penetrant by air assisted, airless and/or electrostatic spraying, spray cans, brushing, flow-on techniques or immersion in a tank of penetrant liquid. The tanks used for all processed chemicals shall be installed with a proper retaining tray. Where fluorescent penetrants are applied by manual spraying equipment, a source of UV-A should be provided for checking the surface to be tested for penetrant coverage. Where spray application is employed, suitable extraction facilities shall be provided. 5.4  Penetrant drain area Penetrant drain stations shall consist of a tray having a sloping base, arranged so that the penetrant is collected in a separate container of the tank containing the penetrant.5.5  Excess penetrant removal area 5.5.1  Immersion wash tank Immersion tanks shall comprise means for agitating the water or moving the components to be tested. The tank may be equipped with a tank for the overflow of a part of the contaminated water. The tank shall be equipped with means for controlling the water temperature. 5.5.2  Spray-wash areas Spray-wash stations shall comprise either manual or automatic spraying equipment. Manual spraying equipment shall be equipped with a water or air/water spray gun capable of delivering a suitable spray at a pressure as low as possible and at a temperature not exceeding 50 °C. The pressure shall be measured as near as practicably possible to the spray nozzle without a valve between the meter and the nozzle. Where manual spraying equipment is employed, a suitable source of illumination shall be provided to control the excess penetrant removal either white light for colour contrast penetrant or UV-A for fluorescent penetrant. Automatic spraying equipment shall meet the requirements for manual equipment. In addition the number, design and location of the nozzles shall be such that all test surfaces of the components are evenly rinsed. A suitable drain shall be provided where automatic spraying equipment is employed. Water retained in recesses shall be removed by suitable means.