View source for Biogas-Plant/C3/Laying-the-foundation/English-timed

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| Time
| Narration 

|- 
| 00:01
| Hello everyone and Welcome to this Spoken Tutorial on Laying the foundation of the biogas plant. 

|- 
| 00:08
| This tutorial is particularly useful for masons. 

|- 
| 00:13
| We are going to learn how to construct a Biogas plant that  is based on the Deenbandhu model and  has a capacity of 2 cubic meter 

|- 
| 00:26
| To begin with we should know the following  

|- 
| 00:30
| The biogas plant consists of 3 different tanks- Mixing tank , Digester tank with the dome and the Slurry tank 

|- 
| 00:40
| The standard dimensions of these tanks are as follows

|- 
| 00:45
| Mixing tank has a diameter of 22 inches and height 2 feet 

|- 
| 00:51
| Gas holder dome has a  diameter of  7 feet and 6 inches and height 4 feet  at the center 

|- 
| 01:02
| The upper slurry tank has a length of 5 feet and 2 inches , width of  3 feet and 2 inches and depth of 4 feet 

|- 
| 01:14
| The  lower slurry tank has length of  2 feet, width  2 feet and depth 2 feet,  2 inches.

|- 
| 01:24
| For ease of understanding for the mason, this video is classified into day-wise activities. 

|- 
|01:33
| Day -1 begins with digging of the area at the site of the biogas plant. 

|- 
| 01:40
| As shown here, use lime powder to mark the outline of the digester tank and the slurry tank 

|- 
| 01:49
| Lime powder is easily available in any hardware store. 

|- 
| 01:54
| Once the area is marked, start digging. 

|- 
| 01:59
| Dig a circular pit of 8 feet diameter and 4 feet depth using a shovel. 

|- 
| 02:06
|  Just adjacent to the big pit, dig another pit of  2 feet and 5 inches of length, 1foot of breadth and 4 feet of depth.

|- 
| 02:20
|  Two labourers can dig these pits in two days. 

|- 
| 02:24
| Alternately, 3 labourers can complete this task in one day. 

|- 
| 02:32
| The epicenter of the pit should be concave in shape  and should be 2 feet deeper than the rest of the pit. 

|- 
| 02:42
| Effort should be made to keep the wall of the pit as straight as possible.

|- 
| 02:49
| This completes the activities for Day 1. 

|- 
| 02:53
| Let’s move on to Day 2. 

|- 
| 02:55
| The activities of Day 2 are as follows 

|- 
| 03:00
| Lay foundation for the digester tank 

|- 
| 03:03
| Construct the dome for the digester tank using chicken mesh 

|- 
| 03:08
|  Construct the mixing tank and 

|- 
| 03:11
| Prepare the walls of the slurry tank 

|- 
| 03:14
| In this tutorial, we will only learn about the digging of the pit and laying foundation for the digester tank. 

|- 
| 03:25
| The other construction topics will be covered in separate tutorials subsequently. 

|- 
| 03:32
| So, now, we have completed the digging of the pit. And we are ready to lay the foundation. 

|- 
| 03:41
| So, let us prepare the plaster mixture for the foundation. 

|- 
| 03:46
| The plaster mixture is basically the gravel and cement mixture. 

|- 
|03:54
| Preparation of this mixture is as follows- 

|- 
| 03:59
|  Sand - 200 kgs 

|- 
| 04:01
|  Cement - 60 kgs 

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| 04:05
| Gravel - 150 kgs 

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| 04:08
| And 250 ml of liquid waterproofing material, thoroughly stirred in 20 ltrs of water. 

|- 
|04:17
| Now pour this liquid over the dry gravel-cement mixture. 

|- 
| 04:24
| Add adequate amount of water to mix everything well so that the mixture is thick in consistency. 

|- 
| 04:34
| Use a shovel for mixing everything as shown in the image. 

|- 
| 04:40
| The gravel-cement mixture is now ready to be used. 

|- 
| 04:45
| Use a small trowel to lay this mixture at the base of the pit, in a circular manner. 

|- 
| 04:53
| The thickness of the plaster should be 3 inches from the ground. 

|- 
| 05:00
| This will form the floor of the pit. Recall that the floor of the pit is concave in shape. 

|- 
| 05:10
| So, the foundation will also be concave in shape. 

|- 
| 05:15
| Carefully raise the side walls of the pit upto 3 inches using the same mixture. However, do not raise the concave part. 

|- 
| 05:27
| Keep in mind- The raised edge of the foundation must be flattened using a small trowel. 

|- 
| 05:35
| This is to ensure proper balance of the dome after it is placed. 

|- 
| 05:42
| After the foundation has been laid, leave it for curing for 12 hours. 

|- 
| 05:49
| Notice the elevated walls and the concave pit, in the image shown. 

|- 
| 05:55
| Also, notice the flattened edges. 

|- 
| 05:59
| With this, we complete this tutorial.

|- 
| 06:03
| Let us summarize

|- 
|06:05
| In this tutorial we have learnt to lay foundation of the biogas plant 

|- 
| 06:12
| This video was created by Spoken Tutorial team with inputs from Rural-ICT team, IIT Bombay. 

|- 
|06:23
| More information on these projects can be found at these links. 

|- 
| 06:30
| This is Bella Tony along with the Animation Team of the Spoken Tutorial Project signing off. 
Thank you for joining.