Page 1 :
Syllabus :, , 3.1 Conveyance : Types of Pipes used for conveyance of w, valves- their use, location and function on a aoeae ater,, , 3.2 Distribution of water :, , choice of pipe material, Types of joints and Types of, , Methods i, , reservoirs - functions and types . Gistribution of water- Gravity, pumping, and combined system, Service, - : , Layouts of distribution of water- Dead end system, grid iron system, circular, , system, radial system ; their suitability, advantages and disadvantages, , , , “34 Conveyance of Water:, , Conveyance of water means :, , (1) Carrying water from the source from the intake structure constructed near the source., , (2) Conveying the water from intake to water treatment plant and from there treated water is conveyed to consumer, through distribution pipe., , Flow diagram of water supply scheme, Source of water, , Surface source Sub-Surface source, , Intake, , Treatment works, Distribution system, Consumers, , Fig. 3.1.1 : Flow diagram of water supply scheme
Page 2 :
conveyance and 2S, , , , , , , , , , , , , , , , , , , Ww Public Health Engineering (MSBTE, , ond hwater flo, Factors affecting selection of pipe materials are ‘, 1. Carrying capacity of the pipes., 2. Durability of pipe., 3. Availability of funds. ot, 4. Maintenance cost, repairs., 5. Type of water to be conveyed and its possi, , Types of pipes : :, __ Depending on whether water flows in gravity or under pressure. eee, (1) Gravity conduit :, Aqueducts, tunnels etc,, (2) Pressure conduit :, , , , i ial., ble corrosive effect on pipe mater, , , , , , , , (2) Cast iron (3) Steel (4) RCC, (6) — Wrought iron (7) Copper (8) Lead, (10) Wooden pipe, , , , , , , are easy to handle and transport., ‘ion pipes of small size,
Page 4 :
¥ Public Health Engineering (MSBTE) stl, , nised., = The inside and outside surfaces of steel pipes are generallY pelva, Advantages :, , The pipes are cheap in first coat., 2. The pipes are available in large length thus the num, , , , , , , ber of joints becomes less., , ‘ ily on curves., 3. The pipes are flexible to some extent and they can therefore be laid easily 5, ne ‘essure., 4. The pipes are durable and strong enough to resist high internal water Pr, hem., , 5. The pipes are light in weight and therefore if becomes easy tO transport tl, Disadvantages :, , 1. The maintenance cost is high., , 2. The pipes are likely to be rusted by slightly acidic or alkaline water., , = 3. The pipes require more time for repairs during breakdown thus not suit, 4. Under the action of internal and external force, steel pipes are likely to deform in shape., , (5) Wrought iron :, , — These pipes are light in weight and they can be easily cut; threaded and worked., _ But they are found to costly and less durable as compared to the cast iron pipes., wrought are not used in the conveyance of water., , (i) Lighter the cast Iron pipe, (ii) Easily cut, threaded worked, (iii) Gives neat appearance # used in interior works., , able for distribution pipes, , , , , , , , , , , , , not sag or bend due to hot water, thus their use is Festricted to convey hot water., Easy) thus cannot be used for distribution of water.
Page 5 :
Lead: Conveyance and Distribution of Water, W), , _ These pipes are usually not adopted forth, _ If proper care is not taken the lead pj Somat Water., Y Cause lead poi., The lead pipes are usually adopteg Ra Poisoning,, q @PParatus, _ They cannot be used ees a — - i. alum and chlorine dosages., nd due to heat, , , , advantages :, (i) Easily bent, (i) Stand high pressure, , , , , , , , , , , , , , , , , Disadvantages :, () Cause poisoning, (ii) Sag when hot water is used, , (8) Plastics pipes :, - The plastic isa new, - Theuse of plastic pipe, , Advantages :, (1) The pipes are good e, (2) The pipes are free, (3) The pipes are cheay, (4) The pipes are light, (5) The pipes upto, Disadvantages :, , The coefficient., The plastic are, Itis difficult to, , The staves at
