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Friday, 8 July 2016

Domestic Biogas Plant Construction Complete Guide 6th Part

Proper construction of domestic biogas plant, construction of inlet tank, fitting of pipeline and appliances of domestic biogas plant.

Proper Construction of Domestic Biogas Plant

Domestic biogas plant construction complete guide is a detailed article which describes; it’s all contents, introductionmaterial required, benefits and installation guidelines. In a proper construction of biogas plant. size, construction site selection and quality standards of construction materials construction of dome, gas holder and outlet tank are discussed in detail in previous five articles. In this post construction of inlet tank, fitting of pipeline and appliances will be discussed in detail.

Construction Of Inlet Tank

As I say earlier, no we are moving towards proper construction of biogas plant. In a proper construction of biogas plant construction of dome, gas holder and construction of outlet tank are described earlier, now next step is a construction of inlet tank. The main purpose of this tank is to mix dung and water for preparation of desired 1:1 ratio paste.

First prepare a well rammed, hard and leveled surface and made a rectangular base for construction. The height of the base should be decided in such a manner that the floor of inlet tank is at least 15 cm above the outlet overflow level.

After construction of the base, the circular portion of inlet tank is constructed. Before the construction of round wall of the inlet, the arrangements should be made in the base for the mixing devise. A pivot should be placed at the centre of the base of the inlet. A circular mark with the help of a thread or chord is made of 30 cm radius to decide the inner circumference of the tank.

The round wall of inlet tank now should be constructed with the brick placed in circular fashion following the mark already made. When the height of circular pit reaches to 45 cm, the iron bracket should be fixed to tighten the mixing device, if it is to be installed. The mixing device should be firmly attached to the structure, easy to operate, effective in mixing process and rust-proof.

The inlet wall should be constructed up to 60 cm. In no case, the height of inlet from the ground level should be more than 100 cm. The inside and outside of the tank are plastered with 1 part of cement to 3 parts of sand. The bottom of the tank must be at least 15 cm above the overflow level in the outlet wall.

Fitting Of Pipeline And Appliances

In the whole process, the biogas produced in the digester and stored in the gas holder is conveyed through the pipeline. If there is any sort of leakage in the laying and jointing of pipes than the desired results couldn’t be achieved.

 Before starting laying of pipes, first, make a layout on paper keeping in view a shorter route from gas holder to the kitchen.

First of all the gas valve has to be fitted in position. Attention should be given not to have any fittings rather than a pipe nipple between the main gas pipe fitted in the dome and the main gas valve to avoid the risk of gas leakage. The joint between two pieces of PVC pipes should be properly sealed with sealing agents.

The biogas conveyed from the gas holder is saturated with water vapours. This water condenses when it comes in contact with the

walls of the pipe. If this condensed water is not drained regularly, it will ultimately clog the pipeline. Hence, a water outlet to drain the water has to be fitted in the pipeline. The position of water drain should be vertically below the lowest point in the pipeline so that water will flow automatically by gravity to the outlet. Water should be drained periodically and therefore the location of water outlet should be conveniently placed.

After laying of pipe from the dome to the kitchen, finally, connect gas stoves and lamps carefully. You can also install the pressure gauge. A gas pressure gauge has to be fixed near the point of application of the gas.

When gas production starts, there is need to regularly check the leakage of joints and valves by applying a thick soap-water solution. If there is leakage, the foam applied in the joints will either move or break. If so happens, the joints must be sealed properly.

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