CLEANING OF EQUIPMENT FOR OXYGEN SERVICE - AIGA

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AIGA 012/04
Appendix D: Detergent cleaning of pipes with high pressure cleaning
equipment
1 Parts to be Cleaned
Bent and straight pipes.
Welded, brazed and soldered manifolds.
Minimum internal pipe diameter:
� Around 13 mm (Depending on hose and nozzle diameter).
Maximum internal pipe diameter:
� Around 300 mm (Depending on nozzle design and pressure.)
Maximum bending angle:
� 90°
Minimum bending radius
� 100-150 mm (Depending on pipe diameter, hose flexibility etc.)
Material
� Stainless steel pipes/manifolds. Some with brass connections soldered to the pipes.
Maximum pipe length
� Up to 30 m. Depending on hose length, number of pipe bends, pipe diameter.
2 Processing of the Parts before Detergent Cleaning
Stainless steel pipes exposed to different kind of treatment like bending, soldering and welding
followed by pickling and pressure testing with potable water.
3 Cleaning Equipment
A high pressure cleaning equipment with high pressure flexible hose and pipe cleaning nozzles. (See
fig 1).
The backward directed jets from the nozzle pull the hose into and through the pipe while flushing the
internal surface.
Hot potable water or apparatus equipped with water heating facilities may be required for heavy duty
cleaning.
4 Cleaning
The cleaning agent is applied at low pressure and ambient temperature via the hose and the nozzle.
In this sequence, the hose must be transported through the pipe manually.
The cleaner foam must wet the whole internal surface.
The cleaner foam is left 5-10 minutes inside the pipe for dirt dissolving action. During this time period,
the pipe should be rotated/turned around 2-3 times to ensure good cleaner accessibility.
5 Rinsing
The internal surface of the pipe is rinsed by warm high pressure clean water from the pipe cleaning
nozzle. The hose is slowly transported back and forth so that all internal surfaces are in contact with