BS/EN 17059-2018 pdf download.Plating and anodizing lines – Safety requirements.
In order to determine the minimum flow rate of the make-up and exhaust air system of plating lines appropriate calculation methods shall be used.
There are two possible minimum flow rates concerning forced ventilation to consider.
Since forced ventilation is a measure for protection against inhalation of hazardous substances and for protection against explosive hazards, one minimum flow rate is related to the capture of hazardous substances, whereas the other minimum flow rate is related to the capture of dangerous explosive atmosphere (flammable substances) like hydrogen.
These shall be calculated and to ensure that hazardous substances are captured the higher of the two flow rates shall be incorporated in the resultant design of the make-up and air exhaust system.
A calculation method, including Formulas (Ill) to (D.3), Figures lii to 117, and Table 111. for airflow rates with regard to tanks with lids and open tanks is presented in Annex D, and the corresponding captured air velocities at the openings with regard to different processes used in plating and anodizing industry are presented in Table El of Annex E.
The manufacturer of the equipment and the supplier of organic and/or inorganic electrolytes shall provide Information to the user about hazardous substances in accordance with the provisions of 6.2.1. For maintenance and cleaning operations see 6.2.3.
Capture of hazardous substances shall be optimized with homogeneous air flow and by avoiding air flow perturbation (e.g. transverse draught). Effective forced ventilation (make-up and exhaust air system) meeting the state of the art will, for example. be ensured by one of the following measures:
— one side rim extraction;
— both sides rim extraction;
— push-pull-principle (one side extraction and blower on the opposite side);
— exhaust booth at transporter system;
— enclosure of the complete equipment or of partial areas (e.g. by screens);
— adequate volume flow and distribution of make-up air.
NOTE 4 lIthe push-pull principle Is used and work pieces are lifted in or lifted out of the treatment tank, especially with regard to manual plating lines, the air stream is deflected so the pollutants may be dispersed instead of being captured. Push-pull systems are difficult to adiust and stabilize.
The minimum flow rate of the make-up and exhaust air system of plating lines, where dangerous concentrations hazardous substances may occur, shall be ensured and monitored. Monitoring can, for example, be made by flow control devices or differential pressure gauges.
4.6.2.1.2 Devices for filling and emptying process tanks
Depending on the hazard potential of process chemistries, equipment shall be available which is capable of ensuring a safe filling, dosing and emptying to the process tanks.
Depending on the filling, dosing and emptying quantity, this requirement can, for example, be met by drains or closed systems with storing tanks for process tanks or tank admixtures, from where process tanks are filled or emptied via ducts or safely fixed hose lines. Where splashes cannot be avoided a physical and permanent protection shall be provided (e.g. screens).
4.6.2.1.3 Circulation and filtration systems
Valves, pipe work, fittings, pumps, filters shall be of materials resistant to corrosion by the chemical products. They shall be capable of sustaining the prevailing fluid pressures and temperatures.
The arrangement of pipes for delivery of process chemistries to process tanks and/or fluid pressure shall be such that the generation of splashes is minimized (e.g. using rigid ducts or fixed hose lines). Where splashes cannot be avoided screens shall be provided.
Pumps, filters and ancillary equipment shall be Installed outside of danger zones and with suitable access for regular maintenance.
Filters requiring regular maintenance shall be sized to ensure adequate on-stream life is achieved and operator interaction is minimized. Where possible, filters using permanent media and automatic operation shall be used.
Drains and isolation valves shall be installed and for large capacity filters use of lifting devices shall be provided to ensure safe maintenance.
Pumps shall be specified with a suitable sealing arrangement to reduce the risk of spraying of chemicals.
To reduce the risk of overheating of process chemicals and/or equipment failure, drive motors shall be fitted with electrical load guards or control system with flow monitoring to monitor high/low current and deactivate the motor in case of out of normal operation.
4.6.2.1.4 DraIning areas
When crossing accessible areas, the relevant protective measures against dripping of hazardous substances shall be taken into account.
See 6.2.2 for information to be given on PPE.
4.6.2.1.5 Freeboard
In order to avoid out of tank splashes a suitable free board in relation to the design and function taking into account solution volume, workpiece volume and flight bar volume shall be respected.BS/EN 17059-2018 pdf download.