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Sewer Appurtenances
Sanitary Engineering
Introduction
● These are structures or devices in a sewerage system
● Constructed at suitable intervals along sewer line
● They assist in operation and functioning and maintenance of the sewerage
system
Manholes
Objectives
● Cleaning
● Testing
● Inspection
● Maintenance
● Removal of obstructions
Location
● Every change of alignment
● Every change in gradient
● Every change in size (dia)
● At every junction
● At regular interval (in case of straight alignment)
Shallow Manhole
● 0.7-0.9m in depth
● Made in domestic areas
Deep Manhole
● Depth more than 1.5m
Construction of Manhole
Manhole Cover
● Made of cast iron, it rests over the frame
● Clear cover of opening not less than 50 cm
● Top level is kept same as level of pavement
Access Shaft
● Upper portion of manhole which gives access to working chamber
● Dimensions less than that of working chamber
● Rectangular: 0.6m* 0.75m
● Circular: 0.6 to 0.75m in dia
● Steps made in it to access working chamber
● Made of bricks
Working chamber
● Lower portion of manhole
● Provides workspace
● Size: circular 1.2m dia
● Rectangular: 0.9m * 1.2m
● Made of brick masonry or cement concrete
● Bottom portion is called benching, made of cement concrete
Manhole Diagram
Drop Manhole
● Constructed to connect a high level branch sewer to a low level main sewer
● Elevation difference more than 0.6m
● Made to avoid splashing sewage on working chamber
● Plug opened while inspecting and cleaning
Lamp Hole
Purpose
● Inspection
● Ventilation
● Flushing (using perforated cover or removing cover)
Catch Basin (Catch Pits)
● For retention of debris in storm water
● If this not present, debris is carried to the sewer
● Helps in settlement of sand, grit, debris from storm drainage
● Settled matter are cleaned periodically
Flushing Tanks
● Provided when there are high chances of blockage
● Blockage occurs when self cleansing velocity is too small or when pipe doesnt
have enough slope
● Also placed at dead end points of sewer
● These hold water temporarily
The water in flushing tank is thrown into sewer for flushing purpose so that the
blockage is removed
Automatic Flushing Tank
Manually Operating
● Consists of a concrete chamber connected to water supply
● Outflow pipe is present, which has a valve so that water can be discharged to
the sewer for flushing
● Gate valve is opened or closed manually
Grease and oil traps
● If sand has to also be removed, dead space kept at bottom of the chamber for
sand to be deposited
Inverted Siphons
● It is a sewer section obstructed lower than the adjacent sewer sections
● Runs full under gravity with pressure greater than atmospheric
● Differs from a true siphon
● Here, it runs with flow line below HGL and therefore under pressure, above
atmospheric
Sewer outlet
● A masonry head structure, made at the bank of streams to discharge into river
● Last point of sewer line
Ventilating Shaft
● A vertical column made of cast iron or steel pipes
● At top of shaft, a copper wire cage or cowl is provided
● Prevents accumulation of gases like ammonia, methane, h2s, co2, etc
● Height must be greater than height of nearby buildings
● Provided every 200-300m
Completed
Sewer Appurtenances.pdf
Sewer Appurtenances.pdf
Sewer Appurtenances.pdf

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Sewer Appurtenances.pdf

  • 2. Introduction ● These are structures or devices in a sewerage system ● Constructed at suitable intervals along sewer line ● They assist in operation and functioning and maintenance of the sewerage system
  • 4. Objectives ● Cleaning ● Testing ● Inspection ● Maintenance ● Removal of obstructions
  • 5. Location ● Every change of alignment ● Every change in gradient ● Every change in size (dia) ● At every junction ● At regular interval (in case of straight alignment)
  • 6. Shallow Manhole ● 0.7-0.9m in depth ● Made in domestic areas Deep Manhole ● Depth more than 1.5m
  • 7. Construction of Manhole Manhole Cover ● Made of cast iron, it rests over the frame ● Clear cover of opening not less than 50 cm ● Top level is kept same as level of pavement Access Shaft ● Upper portion of manhole which gives access to working chamber ● Dimensions less than that of working chamber ● Rectangular: 0.6m* 0.75m ● Circular: 0.6 to 0.75m in dia ● Steps made in it to access working chamber ● Made of bricks
  • 8. Working chamber ● Lower portion of manhole ● Provides workspace ● Size: circular 1.2m dia ● Rectangular: 0.9m * 1.2m ● Made of brick masonry or cement concrete ● Bottom portion is called benching, made of cement concrete
  • 10. Drop Manhole ● Constructed to connect a high level branch sewer to a low level main sewer ● Elevation difference more than 0.6m ● Made to avoid splashing sewage on working chamber ● Plug opened while inspecting and cleaning
  • 11.
  • 13.
  • 14. Purpose ● Inspection ● Ventilation ● Flushing (using perforated cover or removing cover)
  • 15. Catch Basin (Catch Pits) ● For retention of debris in storm water ● If this not present, debris is carried to the sewer ● Helps in settlement of sand, grit, debris from storm drainage ● Settled matter are cleaned periodically
  • 16.
  • 17.
  • 18.
  • 19. Flushing Tanks ● Provided when there are high chances of blockage ● Blockage occurs when self cleansing velocity is too small or when pipe doesnt have enough slope ● Also placed at dead end points of sewer ● These hold water temporarily The water in flushing tank is thrown into sewer for flushing purpose so that the blockage is removed
  • 21. Manually Operating ● Consists of a concrete chamber connected to water supply ● Outflow pipe is present, which has a valve so that water can be discharged to the sewer for flushing ● Gate valve is opened or closed manually
  • 22.
  • 23. Grease and oil traps
  • 24.
  • 25. ● If sand has to also be removed, dead space kept at bottom of the chamber for sand to be deposited
  • 26. Inverted Siphons ● It is a sewer section obstructed lower than the adjacent sewer sections ● Runs full under gravity with pressure greater than atmospheric ● Differs from a true siphon ● Here, it runs with flow line below HGL and therefore under pressure, above atmospheric
  • 27.
  • 28. Sewer outlet ● A masonry head structure, made at the bank of streams to discharge into river ● Last point of sewer line
  • 29. Ventilating Shaft ● A vertical column made of cast iron or steel pipes ● At top of shaft, a copper wire cage or cowl is provided ● Prevents accumulation of gases like ammonia, methane, h2s, co2, etc ● Height must be greater than height of nearby buildings ● Provided every 200-300m