Wellhead Assemblies for Drilled Wells12.4
To support the drop pipe and seal the wellhead, choose
one of these methods
Well Seal System
These methods are NOT specific to solar pumps. The
components are available from conventional water well
suppliers.
The well seal is a plate that fits on top of the well casing.
It provides a seal against contamination, and it supports
the weight of the in-well assembly. In a freezing climate,
the wellhead must be located in a heated building or in a
covered well pit, or the pipe must be made to drain when
the pump stops. See section 13.7, Freeze Protection
Use metal pipes above ground, for strength. A tee and a
plug is used instead of an elbow, because the plug allows
direct observation of water level and flow. It also provides a
place to attach a lifting device.
Pitless Adapter System
The pitless adapter is a fitting that allows your buried pipe
to pass through the well casing underground, without the
need to build a covered pit. It provides protection against
freezing, flooding, animals and human activities that can
damage exposed piping.
After the pitless adapter is installed, the pump can be
installed and removed from above, with no further need
to dig. The inside half slides apart vertically by means of
a dovetail joint and an O-ring. A piece of threaded pipe is
used as a temporary tool for installation or removal. Thread
it into the socket on the inside half of the adapter.
If the well casing is 4 in (inside diameter) the pitless adapt-
er must be designed not to reduce the clearance inside the
casing (it clamps around the outside of the casing).
Two pumps in one well If you have a well casing of 6 in or
larger, you may be able to install two pumps in the well, by
using two pitless adapters.
Check Valve
A check valve (non-return valve) prevents stored water
from escaping down the well in case of a leak in your drop
pipe. It may also help the pump to start easier if it feeds
into a very long pipeline. If you use a weep hole for freeze
protection, omit this check valve to allow the pipe to drain.
metal pipe section
electric cable
electric cable
electrical conduit
well chasing
well chasing
well cap
well seal
electric cable
temporary puller pipe
eye bolt
safety rope
eye bolt
check valve (optional)
check valve
plug
pitless adapter
drop pipe
Well Seal SystemFigure 32:
Pitless Adapter SystemFigure 33:
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