CLEANING OF EQUIPMENT FOR OXYGEN SERVICE - AIGA
CLEANING OF EQUIPMENT FOR OXYGEN SERVICE - AIGA
CLEANING OF EQUIPMENT FOR OXYGEN SERVICE - AIGA
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Appendix G: Cleaning of a vessel with aqueous agent and solvent<br />
1. Material /Size<br />
Stainless steel or aluminium alloy<br />
Dimensions up to ∅ 3000 x 4000 mm<br />
2. Pre-cleaning<br />
51<br />
<strong>AIGA</strong> 012/04<br />
Prior to welding, vessel shell and ends are pre-cleaned separately with an aqueous agent (phosphate<br />
free with low alkaline content) at a temperature of approximately 50°C, then flushed with<br />
demineralised water for approximately 60 minutes.<br />
3. Inspection before Welding<br />
A wipe test is carried out after the drying operation. If there is any indication of grease or oil, the<br />
pie-cleaning operation is to be repeated.<br />
4. Cleaning<br />
After final welding a tube is installed in order to carry out a complete jet spray cleaning using solvent<br />
141 b (see figure and chapter 3, table 1).<br />
5. Inspection after Cleaning<br />
Quantitative control by solvent extraction (weight of the residue after vaporisation)<br />
6. Conservation of Cleanliness<br />
At all stages of assembly, components are protected against contamination. After inspection the tank<br />
is sealed with degreased flanges and slightly pressurised with nitrogen.<br />
7. Labelling<br />
"CLEANED <strong>FOR</strong> <strong>OXYGEN</strong> <strong>SERVICE</strong><br />
Pressurised with N2 ………………….bar<br />
Keep free from oil and grease<br />
Inspection date/stamp"
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