CLEANING OF EQUIPMENT FOR OXYGEN SERVICE - AIGA

47
AIGA 012/04
the high pressure jet. Rinsing is continued until the pH value of the used rinsing water is the same as
that of the fresh incoming water. (pH value may be tested by litmus reactive paper).
The hose is normally self-transported forward through the pipe, but in case of numerous bends, pipe
restrictions and other obstacles, the hose may need some manual help for transportation.
In some cases, the cleaning/rinsing procedure may be repeated from other pipe openings.
6 Drying
Prior to commencing drying, all free standing water must be emptied from the pipe. Special care must
be taken where dead ends and other pockets exist.
The drying is effected by blowing through hot nitrogen or clean oil free air. It is important to check that
all parts are reached by the hot gas.
7 Cleaning Agent
Water based alkaline detergent. A foaming agent is preferred due to its ability to stick to vertical
surfaces. Several proprietary cleaners are available on the market.
Cleaning conditions like detergent concentration, rinsing water temperature etc. should be determined
through tests and should comply with the detergent supplier's recommendations.
Typical conditions are
� Cleaner concentration 20-50 %
� pH, diluted solution 12
� Rinsing temperature 50 °C
�
8 Safety
Protective clothing, gloves, apron, eye and face protection are recommended to be worn by the
operator whilst carrying out high pressure cleaning.
Skin contact with detergent chemicals should be avoided as serious skin disorder can result.
The manufacturer's product information and material safety data sheets must be carefully studied and
followed.
9 Inspection Method - Direct visual inspection with White Light.
Wipe test all pipe openings. A cloth fastened to a lick may be used for wipe test of deeper internal
surfaces.
10 Conservation of cleanliness
All pipe ends are sealed with plastic plugs.
11 Labelling
Cleaned for oxygen service
Keep free from oil and grease
Inspection date/stamp