Biogas-Plant/C3/Laying-the-foundation/English-timed
From Script | Spoken-Tutorial
| 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 meters. |
| 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, 1 foot of breadth and 4 feet of depth. |
| 02:20 | Two laborers can dig these pits in two days. |
| 02:24 | Alternately, 3 laborers 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, |
| 04:05 | gravel - 150 kgs, |
| 04:08 | and 250 ml of liquid waterproofing material, thoroughly stirred in 20 liters 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 up to 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. |
