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Mandatory Requirements – Casing

Mandatory Requirements

– Water Well Casing –

The minimum casing size shall be 100 mm, excluding for monitoring wells.

The casing and casing joints shall withstand the pressures imposed during
the installation and operation of a water bore.

All casing joints shall be aligned, secure, and leakproof.

The appropriate PVC cleaner and Type P solvent cement (AS/NZ 3879)
should be used to solvent weld PVC-U pipe.

The casing material used shall comply with
manufacturer’s standards as follows:

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The minimum acceptable casing wall thickness shall be:
Stainless steel casing (Grade 304/316 stainless steel)

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1. Two schedules of stainless steel are generally available in Australia:
Schedule 10 and Schedule 40.

2. Schedule 10 is the minimum acceptable schedule
and is generally used for shallow wells;
Schedule 40 is used for deeper applications and for larger diameter bores
because of its greater wall strength.

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PVC casing

PN 9 PVC-U pressure pipe is the minimum class
allowed for use as bore casing.

PN 6 PVC-U pipe, PVC-U sewer, PVC–O, PVC–M,
and drainage pipe shall not be used.

Maximum potential pressure differential (i)
for PVC-U bore casing (head difference)

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(i) PVC-U should be de-rated in pressure rating
when temperature exceeds 20°C.

(ii) The maximum difference in metres between external
and internal water level.

Includes fully grouted and gravel pack.

(iii) The tables for minimum wall thickness for Stainless steel
and FRP are based on havin similar collapse pressure
to steel casing of the same diameter (See table 9.2)

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