Domestic Biogas Plant Construction Materials
In domestic biogas
plant construction guide, we have discussed how to produce gobar gas plant in
general and its benefits, components, size, site selection are described in detail
earlier. Standards and specifications of domestic biogas plant construction
materials and appliances
are presented here in detail with images.
Cement, sand,
gravels, water, bricks, acrylic emulsion paint, mild steel bars, main gas pipe,
main gas valve, pipes and fittings, water outlet, gas tap, rubber hose pipe,
gas stove, gas lamp, gas pressure gauge and mixing device are the main material
which is required for domestic biogas plant construction. Quality of Cement,
sand, gravels, water, bricks and other material used is really important for
durability of bio
gas plant.
Acrylic Emulsion Paint
Acrylic emulsion
paint is used to make the dome / gas holder of biodigester air tight. Paint
used for this purpose must be of good quality and standard well known company.
Mild Steel Bars
Mild steel bars are
used for the construction of the covers of the outlet tank. Mild steel bars
used should be of good quality and free from heavy rust. For plants of 4, 6 and
8 cum, MS rods of 8 mm diameter and for plant of 10 cum capacity 10 mm diameter
bars should be used.
Main Gas Pipe
Main gas pipe at least 60 cm long is used to convey the gas from gas holder and is placed at top most portion of the dome.
The joint of reduction elbow with this pipe should be
perfect and gas tight otherwise gas leakage from this joint can not be stopped
easily. Therefore it is recommended that the reduction elbow has to be fitted
in a workshop to ensure perfect air-tightness of the joint. This pipe should be
made up of light quality iron and MS rod has to be welded at one end to embed it
with the concrete during installation.
Main gas pipe at least 60 cm long is used to convey the gas from gas holder and is placed at top most portion of the dome.
Main gas valve
It is opened
when gas is to be used and closed after each use. To avoid the leakage of gas, Main
gas valve of good quality should be used.
Gas tap is used for regulating flow of gas to
the gas stove. Gas tap should be of high quality to avoid gas leakage through
them. It should not be too tight or loose to operate.
Gas stoves can be used
of both types single and double burners. In general a single burner
gas stove is used for household purposes. The stove should be of good quality
and strong enough to firmly rest in ground. The primary air intake should be
easily adjustable and the holes should be properly placed. The jet and pipe
leading to the burner should be straight and aligned properly.
U-shaped pressure
gauge, manometer made up-of a transparent plastic or glass tube and filled with
coloured water or a clock-type digital or analogue pressure meter has
to be installed in the conveyance system to monitor the pressure of gas.
Main gas valve is
used to controls the flow of biogas in the pipeline from the gas holder.
Water Outlet
Water Outlet drains the water condensed
inside the pipeline when biogas comes in contact with the cool pipe. It should be
easy to operate and threads in it should be perfect. It should be ensured that
the hole in the screw nut is bored properly and is located at the right place.
The thickness of the nylon washer has to be 4mm and either a 4 cm long handle
pin or a properly knurled opener should be used.
Gas Tap
Rubber Hose Pipe
Rubber Hose Pipe is used to convey gas from
the gas tap to the stove.
This pipe should be made up of high quality neoprene
rubber and should not develop cracks when folded. It should have 15 mm outer
and 9 mm inner diameters. The minimum wall thickness of the pipe should be 2.5 mm.
Gas Stove
Gas Lamp
Gas lamp used should be of high quality.
Gas Pressure Gauge
Mixing Device
This device is used
to prepare good quality water dung solution in the inlet tank when cattle dung
is used as feeding material. Usually for household biogas digesters, vertical
mixing devices are installed. The device should be of good quality, as per the
design, and the mixing blades have to be well galvanised. The blade should be
properly aligned for the effective mixing.
