What factors should be considered while selecting a material for sewer construction?
What factors should be considered while selecting a material for sewer construction?
The selection of material for the sewer pipe is governed by the following factors:
- Carrying capacity of the pipe.
- Durability, strength, and life of the sewer pipe.
- Imperviousness and weight.
- Resistance to corrosion and abrasion.
What is the design of sewage?
The sanitary sewerage systems for domestic sewage are designed for peak sewage flow expected at ultimate stage at the end design period. The storm water drainage systems are designed to carry the maximum storm runoff expected during the critical duration of rainfall.
What are the mandatory requirements for a drainage system?
Also the pipes should be:
- Durable;
- Resistant to low and high temperatures;
- Smooth inside – smooth inner surface allows to avoid frequent clogging;
- Mechanically and chemically wear resistant;
- Robust;
- Compatible with outdoor drainage system.
What are the factors affecting sewer design?
Factors Influencing the Condition of Sewer Pipes: State-of-the-Art Review
| Physical factors | Environmental factors | Operational factors |
|---|---|---|
| Pipe shape | pH | Hydraulic condition |
| Pipe slope | Road type | Infiltration/exfiltration |
| Pipe age | Root interference | Previous maintenance |
| Pipe depth | Soil corrosivity | Sediment level |
Which one is the construction material for sewer?
Following materials are generally used in the construction of sewer: 1. Bricks 2. Vitrified Clays or Stoneware Pipes 3. Cement Concrete Pipes 4.
What are the types of sewerage system?
The sewerage systems or water carriage systems are of the following three types: 1. Separate System 2. Combined System 3. Partially Separate System.
What are basic requirements of house drainage?
Principles of House Drainage All the drains should be aligned straight between successive inspection chambers. Therefore, sharp bends and junctions should be avoided through chambers. The slope of the drains should be sufficient to develop self cleansing velocity. All the connections should be water tight.
Is there a minimum depth for drains?
In order to carry the flow and to avoid blockages, the drain or sewer that you intend to connect to generally needs to be at least 0.8m lower than the ground floor level.
What happens when a sewage well is inundated?
Inundation may also result in severe scouring around structures, particularly around the wet well, valve chamber, and possibly cause damage to the critical components such as the electrical switchboard.
What are the requirements for a sewage pumping station?
The pumping station has to be so located and constructed such that it will not get flooded at any time. The storm-water pumping stations have to be so located that water may be impounded without creating an undue amount of flood-damage, if the flow exceeds the pumping station capacity.
How is a grit well and wet well designed?
The grit well shall be an independent well upstream of the wet well. A reliable grit removal system shall be a simple submersible pump set. The system shall be designed such that the floor of the wet well is depressed below the level of the incoming and outgoing sewers.
What is the minimum depth for a sewage pump?
This is governed by the height of the submersible pump set and the floor clearance. Assuming the height of the pump set as 1.2 m and floor clearance as 0.3 m the minimum depth of the floor of the wet well below the invert of the sewer shall be 2 + 1.5 = 3.5 m.