Skip to content

Civil Engineering

  • Home
  • Videos
  • CONCRETE
  • Highway
  • Railway
  • WasteWater
  • BMC
    • Building Construction
  • soil
  • Irrigation

Precautions to be Taken While Entering Sewers

Posted on 10th October 20191st March 2022 By Malay Sautya

Precautions to be Taken While Entering Sewers

Various poisonous and explosive gasses are commonly found in sewers such as hydrogen sulphide (H2S), carbon dioxide (CO2) and methane (CH4) along with petrol vapours. These gases are produced largely when the sewage becomes stale and septic, which occurs more commonly in hotter climates.

Precautions to be Taken While Entering Sewers

In addition to the production of these harmful gases, oxygen is consumed by the organic matter for their decomposition, resulting in a lack of oxygen inside the sewer and can, therefore, cause difficulty in breathing.

Various methods are adopted for ventilating the sewers in order to avoid the large scale presence of these poisonous and hazardous gases inside the sewers. In addition to the ventilation of sewers, the following precautions should also be taken while allowing the workers to enter the sewers: 

1. The very first precaution which should be taken before entering a sewer through a manhole is to open the covers of the manholes; at least half an hour in advance. This will help in obtaining some ventilation and exposure of the sewer to the atmospheric oxygen.

2. Tests should be conducted in order to identify the presence of any harmful gases inside the sewer. The following tests may be carried out to detect their presence.

  • The first test is performed to detect H2S gas present in the sewer.
  • The second test is performed to detect CO2 gas present in the sewer.
  • The third test is performed to detect CH4 gas present in the sewer.

3. If the above hazardous gases are absent, a lighted lantern may be lowered down the manhole, so as to test the presence of oxygen. If it burns brilliantly, the sewer can be safe to enter.

4. In any case,  the staff who go down into the sewer for inspection must be bound to their waists with ropes and hold them fast by persons on the top so that they can be pulled up quickly in case of any risk. A responsible officer should be available to handle the operations perfectly.

5. It is strictly prohibited to smoke or bring open light inside the sewers.

6. Necessary indicators of alert should be set up.

Read Also:

 Methods of Ventilation in Tunnels

 Method of Ventilation of House Drains System

 Purposes of Ventilation in Buildings

Tags:WasteWater

Post navigation

Previous Post: Hot Working of Steel
Next Post: Rubber Flooring

Related Posts

  • Method of Ventilation of Sewers WasteWater
  • Sludge Digestion Tank WasteWater
  • Partially Separate Sewer System And Their Advantages & Disadvantages WasteWater
  • Object Of Sewage Treatment And Location of Plants WasteWater
  • Design of Septic Tank Along With Soak Pit For 30 Users WasteWater
  • Dead End System – And Their Advantages and Disadvantages WasteWater
  • Sludge Drying Bed – Wastewater Treatment WasteWater
  • 19 Types Of Sewer According To Material And Place of Use WasteWater
  • 3 Types of Sewage Pumps And their advantages and Disadvantages water
  • 4 Difference Between One And Two Pipe System WasteWater

Categories

  • Highway engineering
  • Railway Engineering
  • BMC
  • WasteWater
  • soil
  • CONCRETE
  • Building Construction
  • Irrigation Engineering
  • Hydraulic Structure
  • water
  • Cement
  • Foundation Engineering
  • Building Parts
  • Aggregate
  • Mathematical Example
  • Tunnels
  • Survey Engineering
  • PAVEMENT DESIGN
  • Hydrology
  • PAVEMENT DESIGN – MCQ
  • Building Material
  • Floors
  • Highway Engineering – MCQ
  • HYDROLOGY M.C.Q
  • Engineering Geology – M.C.Q
  • Railway Engineering – MCQ
  • Water Supply – MCQ
  • Building Materials – MCQ
  • Soil Engineering – MCQ
  • Irrigation Engineering – MCQ
  • 10 Types of Roads Classification in India(Urban & Non-Urban Road)
  • 3 Characteristics of Sewage – Physical, Chemical and Biological Characteristics
  • TYPES OF RAILS – Double Headed, Bull Headed and Flat Footed Rails
  • 6 Types of Classification of Gradient – Ruling, Limiting, Exceptional, Minimum, Average and Floating Gradient
  • Railway Gauge – || Definition || Types || Factor Affecting || Advantages of Uniform Gauge ||
  • 8 Different Types of Cement Test || Building Materials & Construction
  • What is Creep of Rails? Causes of Creep of Rails – Railway Engineering
  • Slump Testing of Concrete
  • History of Road Development in India
  • 100+ All Traffic Signs or Road Safety Signs in India as per IRC

Top Posts & Pages

  • How To Calculate True Bearing From Magnetic Bearing - || Rules and Example||
    How To Calculate True Bearing From Magnetic Bearing - || Rules and Example||
  • 7 Shapes of Tunnels
    7 Shapes of Tunnels
  • 11 Factors affecting For Selection of Type of Bridge
    11 Factors affecting For Selection of Type of Bridge
  • TYPES OF RAILS - Double Headed, Bull Headed and Flat Footed Rails
    TYPES OF RAILS - Double Headed, Bull Headed and Flat Footed Rails
  • 12 Basic Principles of Building Planning
    12 Basic Principles of Building Planning
  • Advantages and Disadvantages of Traffic Signals
    Advantages and Disadvantages of Traffic Signals
  • Factors Affecting The Quantity Of Sanitary Sewage
    Factors Affecting The Quantity Of Sanitary Sewage
  • Rainfall Intensity And Their Formula
    Rainfall Intensity And Their Formula
  • 8 Factors Affecting Infiltration Capacity
    8 Factors Affecting Infiltration Capacity
  • Swedish Circle Method For Analyzing The Slope Stability
    Swedish Circle Method For Analyzing The Slope Stability
  • Reinforcement Details In Column – Building Construction Building Construction
  • 14 Characteristics of A Good Timber BMC
  • 8 Factors Influencing the Choice of Mix Proportions CONCRETE
  • Introduction of Remote Sensing and GIS - MCQ
    Introduction of Remote Sensing and GIS – MCQ Remote Sensing & GIS - MCQ
  • 8 Factors Affecting Infiltration Capacity Irrigation Engineering
  • Wear of Rails And Their Classification Railway Engineering
  • Traffic Engineering - MCQ
    Traffic Engineering – MCQ Highway Engineering - MCQ
  • How To Verify The Given Bearing Capacity of Any Soil soil

Recent Posts

  • Top 10 Tallest Buildings and Structures in Japan
  • Top 10 Tallest Buildings in Australia as of 2022
  • Advantages and Disadvantages of Mud houses
  • Top 10 Tallest Buildings in Germany as of 2022
  • Home
  • About us
  • Contact

Popular Post

  • 16 Different Types of Windows used in Buildings
  • Different Types of Stairs Used in Building Construction
  • 18 Different Component Parts of an Arch
  • 12 Basic Principles of Building Planning
  • 15 Advantages and Disadvantages of Sprinkler Irrigation Method

Copyright © 2022 Civil Engineering.

Powered by PressBook News WordPress theme