GAIL (India) Limited

803.16 Cast iron gratings shall be flat with perfect edge and of the best quality procurable of the specified widthand thickness and in the available lengths3.17 FLOOR TRAPS3.18 FIXINGFloor traps shall be deep seal, ‘P’ or ‘S’ type of approved make with CP brass gratings.The traps shall be placed in position and encased all around with 150 mm thick concrete 1:2:4 whenevernecessary vertical pieces with sockets shall be joined to traps to accommodate CP brass gratings.3.19 BALL VALVEThese shall be brass heavy quality with plastic floats of size that of the inlet pipe to the over head tank.4. EXTERNAL SEWERAGEThe work under this section shall consists of furnishing all labour, material, equipments and appliancesnecessary and required to completing install the sewerage system as specified hereinafter shown in thedrawings.4.1 GENERAL REQUIREMENTSa) All materials shall be new and of the best quality conforming to specifications and subject to the approvalof the Consultant/Engineer-in-charge.b) Drainage lines shall be laid to the required gradients and profiles.c) All drainage work shall be done in accordance with the local municipal bye laws.d) The contractor shall take necessary permissions from the local traffic police, and civic and othercompetent local authorities for cutting the main/municipal roads, closing and road/street to vehiculartraffic for laying his services. The contractor shall not be liable for any extra payment on this account.e) Location of all manholes, catch basins etc., shall be got confirmed from the Consultant / Engineer-inchargebefore the actual execution of work at site.f) All works shall be executed as per approved drawings, working drawings or as directed by the Consultant/ Engineer-in-charge.4.1.1 ALIGNMENT AND GRADIENT.The sewer drainage pipes shall be laid to alignment and gradient shown on the drawings but subject tosuch modifications as shall be ordered by the Consultant / Engineer-in-charge from time to time to meetthe requirements of the works. No deviation from the lines, depth of cutting or gradients of sewers shownon the plans and sections shall be permitted except by the express direction in writing of theConsultant/Engineer-in-charge.4.1.2 EXCAVATIONThe excavation for sewer works shall be open cutting unless the permission of the Consultant / Engineerin-chargefor the ground to be tunneled is obtained in writing Where sewers have to be constructed alongnarrow passages, the Consultant / Engineer-in-charge may order the excavation to be made partly intunnel and in such cases the excavated soil shall be brought back later on for refilling the trenches ortunnel4.1.3 OBSTRUCTION OF ROADSThe contractor shall not occupy or obstruct by his operation more than one half of the width of any roador street and sufficient space shall be then left (or public and private transit, and he shall remove thematerials excavated and bring them back again when the trench is required to be refilled. The contractorshall obtain the consent of the Consultant/Engineer-in-charge in writing before closing any road tovehicular traffic and the foot walks must be clear at all times.