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SERIES 30 HYDRANT

INSTALLATION, OPERATION & MAINTENANCE MANUAL

4. maintenance

SaFEty prEcautionS:

When changing the Seat seal, Maintenance Procedures MUST NOT be carried out whilst the hydrant is installed in a

live water main under pressure.

4.1. procEdurE for Removal of the Seat, Dome and Spring Assembly

SAFETY PRECAUTION:

This procedure MUST NOT be carried out with the hydrant under pressure.

Check to ensure there is no pressure in the main prior to commencing work.

Ensure the main WILL NOT be recharged before all work on the hydrant is completed

First insert a stand pipe to ensure the pipeline is not under pressure.

Ensure area around the hydrant is clear of soil and debris so contaminants don't enter the pipeline when the top yoke

is removed .

Caution at this point is required as the spring behind the dome will have tension upwards forcing the

yoke up once nuts are removed

Remove nut ( 7 ) from bolt (8), removing both equally as the spring dome (6) will have tension upwards on the seat (4) and

yoke (2) .

Keep pressure down on the yoke (2) during the final removal of the bolts as the dome is forcing upwards

Remove the yoke (2) carefully, the seat (4) the dome (6) and spring (5) will be accessible to remove from the body (1).

SWAB 30/10 VERSION

The insert that supports the spring and dome can be removed at this point

AVK Australia Holdings Pty Ltd - 559A Grand Junction Road, Wingfield, SA 5013, Australia - Tel: +61 8 8368 0900 - Email: [email protected] - www.avkcivil.com.au

Version number 2

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