- Dehydrating breathers

Off shore - C5M

HAMP’s inhouse-manufactured dehydrating breathers are of very high quality and delivered to customers in both Europe and the US, as well as Africa and Asia.

4130-2 C5M, 4130-4 C5M, 4140 C5M

4130-2 C5M

4130-4 C5M

4140 C5M

Area of use

About the product

The dehydrating breathers are produced for offshore use in marine climates in accordance with ISO-standard ISO 12499-2 and ISO 9223.

Coated in accordance with C5M and tested for 1 500 hours in a climate cabinet. Parts prone to suffer from corrosion and galvanic corrosion are sealed.

The C5M designation means that the dehydrating breathers are especially suited for use in transformers situated on oil rigs, in coastal regions or on offshore wind power plants.

Off shore - C5M

Max oil weight (kg)
Comp. Weight (kg)
Silica gel weight (kg)
Total height (mm)
3040 1050C5M
4130-2 C5M
3040 1060C5M
4130-4 C5M
3040 1070C5M
4140 C5M

Step by step

Mounting and maintenance instructions

1. Screw the dehydrating breather onto the pipe under- neath the expansion tank. The cover has a location flange. With types 4130-4 and 4140 the base also has a location flange.

2. Loosen the three upper wing nuts a few turns and then lower the front retainer bolt. Remove the plexiglass container and fill it with silica gel.

3. Check that both gaskets are correctly located, and fit the container. Tighten the wing nuts firmly, to ensure good sealing.

4. Remove the oil trap bowl by loosening the wing nut on the underneath and turning the retainer forwards 90 degrees. Fill with transformer oil up to the level mark on the oil trap.

5. Make sure the oil does not moisten the silica gel as this will destroy the gel.

Contact us if you have questions

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See our other products

Large oil cup

Dehydrating breathers produced with an extra-large oil trap, manufactured for use in applications where the transformer risks being put through quick and intense fluctuations in terms of strain. Example of such applications are: wind farms and furnaces. 

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