Comparative Statement of Various Pipes for Gravity Sewers

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1 Comparative Statement of Various Pipes for Gravity Sewers EVALUATION Length Diameters Type of Joint 0.6m 2 to 2.5m 6 or 12m 6 m 6 or 12m 100 to 300mm for higher diameters it is not economical. S&S joint with caulking yarn soaked in cement slurry or tarred gasket. Joint is covered with cement mortar. 150 to 2000mm in both collar and S&S joints. up to 630mm Solvent Cement joint and Rubber Ring joint Up to 1000mm Tyton joint with rubber gasket up to 630mm Butt fusion welding process. 4. Weight Light Heavy Light 5. Handling Roughness Coefficient of Pipe Corrosion resistance Easy due to shorter length and light Difficult due to heavy Easy due to light Heavy but lighter than R.C.C. pipes. Difficult due to heavy in larger dia Light Easy due to light by hydrogen sulphide gas. Subject to H 2 S corrosion due to acids, Protective layers are required to

2 8. Life More than 50 years 30 years Class of Pipes ts of Special Equipments Grade A & AA (Non pressure pipes) highly septic sewage and by highly acidic or high Sulphate soils and where velocities are not sufficient to prevent septic conditions. To prevent corrosion Sulphate cement concrete to be used for pipe manufacture. NP1, NP2, NP3, NP4 (Non pressure pipes) Life is more than 50 years due to highly corrosion. 6Kg/Sq.cm, 8Kg/ Sq.cm,10Kg/Sq.cm, 12Kg/Sq.cm protect corrosion More than 50 years K-7 to K-12 K-7= 12-32kg/sqcm. K-9= 25-50kg/sqcm Depending Upon the dia of pipe. Not required Not required Not required Not required Life is more than 50 years due to highly corrosion. PN 2.5, PN4, PN6, PN10 (2.5Kg/Sq, 4Kg/Sq, 6Kg/Sq and 10Kg/Sq) Welding equipment required for jointing

3 Stacking the Pipe Materials Cost of supplying, laying and jointing of meter length anywhere. Care should be taken while loading, unloading and stacking. 200 mm: Rs mm: Rs: mm: Rs: 517 (DSR % Price anywhere. Care should be taken while loading, unloading and stacking. (NP3 Pipe) 350mm: Rs mm: Rs mm: Rs mm: Rs NP2 Pipe 200 mm: Rs mm: Rs mm: Rs mm: Rs mm: Rs 1095 (UP JN) To avoid exposure to sunlight, it is stacked in covered area. This also requires a special type of stacking to avoid buckling and damage of pipe ends Care should be taken while loading, unloading and stocking. 6 kg/cm 2 200mm: Rs. 604 (UPJN+20% for laying & Price Contngency) 315mm: Rs (MP ADB Project+20% Price anywhere. Care should be taken while loading, unloading and stocking. (25-50 kg/cm 2 ) K9 Pipe 200mm: Rs: mm: Rs: mm: Rs: mm: Rs: mm: Rs:12283 (UPJN Supply rate+20% for laying & price Same as upvc PE 100, PN mm: Rs mm:Rs mm: Rs mm: Rs mm: Rs (MP ADB Project+20% Price

4 Remarks on Cost t in Refilling the Trench 15. Infiltration 16. Workability 17. Effect of Radiation Comparatively Cheaper No stone or rock to be filled while refilling. If joints are week/poor, chance of infiltration is high due to more number of joints. Light for easy handling. NP2 is Cheapest among all materials No stones or rocks to be filled while refilling. Infiltration is less if rubber joints are used but joints should be proper if collar joints are used. For larger diameter due to heavy handling to be done with care Costlier than RCC pipe but cheaper than HDPE pipes. Sand bedding is required to avoid the deflection of pipe due to burden of earth. No stones or rocks to be filled while refilling. Infiltration is very less Light for easy handling. Affected by UV rays if stored for a long duration in Costlier than other pipes but cheaper than HDPE pipes. No stones or rocks to be filled while refilling. Infiltration is very less Good Smaller diameter pipes are cheaper and higher diameter pipes are costlier. Concrete arch bedding is required to avoid the deflection of pipe due to burden of earth. Infiltration is very less Light for easy handling. Affected by UV rays if stored for a long duration in open fields

5 Jointing Skill ts Protection to the Pipe 20. Maintenance 21. Previous Experience/ Performance Requires quality supervision Depending upon the loading conditions, pipes should be protected with either sand or Cement Concrete bedding Almost nil if joints are properly made. In use for long period and performance is satisfactory Jointing is easy in S&S pipes with rubber ring joints. Depending upon the loading conditions, pipes should be protected with either sand or Cement Concrete bedding Almost nil if proper velocity is maintained. In use for long period and performance is Good open fields hence it should be kept covered. Jointing is easy in S&S pipes using solvents. Pipe should be protected against deflection due to super imposed loads. Pipe embedded portion should be well compacted. Pipe may get damaged due to rodding Not common for street sewers but now picking up use to connect houses to sewer Jointing is easy in S&S pipes with rubber ring joints. Not required Minimum It is durable pipe. Performance is yet to be proven hence it should be kept covered. Jointing is expensive and jointing results in beeding which causes obstruction for solids in sewage Pipe should be protected against deflection due to super imposed loads. Pipe embedded portion should be well compacted. Pipe may get damaged due to rodding Recent use started in India. It is durable