The chemical composition shall comply with the requirements stipulated in IS: From each batch of pads manufactured from the same cast of metal under similar conditions, pads at the rate of 1 per 5, and in case the current production per shift is less than , 1 per shift shall be selected at random by the purchaser or his Inspecting Authority for test. The tensile strength and elongation at fracture of the material shall be determined in accordance with IS :l The tensile strength shall not be less than 42 Kg.
Should the test pieces from either of these additional samples fail, the material represented by the test samples shall be considered as not having complied with this standard. The checking of the dimensions may be made by means of templates mentioned in.
Bundling is not called for in case an order is placed for large quantities i. In case of second-hand sleepers, the same shall satisfy following additional requirements Dipping of such sleepers into a solution made of coaltar and tar-oil as per clause 13 of I R S Specification T shall preferably be done after welding of the steel rail pads on to the steel trough sleepers.
In case, this is not possible, the protective coating in the portion of the sleeper where the place would be welded shall be removed before welding work is commenced. In case steel rail pads are already dipped in hot boiled linseed oil to IS: or in any other rust preventive compound, the oil compound shall be removed from the four sides of the plates where the welding work would be done, before the same is commenced.
The plates used for test pieces shall be to IS: Specification for structural steel Standard Quality. The plates used for the test pieces shall he of the same material as the pads.
Each welder shall be tested after welding one thousand sleepers or after 6 months whichever is earlier. Welding procedure test shall be carried out through deferent welders, employed on the job, by rotation.
Tests mentioned in clauses If so desired by the Purchaser or the Inspector these tests shall have to be carried out at more frequent intervals. Should both these additional test pieces pass, the batch of sleepers, represented by the test pieces shall be deemed to comply with the requirements of that particular test.
Facility for automatic updation through software based Analysis Of Rates. Updation of SOR is possible as frequently as desired with very little efforts.
A combination of Universal Items being used all over Indian Railways and also area-specific items being used by some Zonal Railways. Salient Features Of Finalised Documents 5. The Basic Data Input Sheet designed for feeding prevailing rates of materials, labour, equipments etc.
Salient Features Of Finalised Documents. Software for facilitating further adoption in estimates preparation by Zonal Railways. Further Vision through integrated I. From 01 to such as item in chapter no. Right most digit indicate sub item within the main item. Vary from 0- 9 and will have value 0 if there is no sub item. PPR membrane, Epoxy etc. Railways have successfully leaped forward in preparing an ultra-modern technology based document which will help IR a long way in the years to come.
A separate part for P. General Instructions. Cost of white cement, wherever required is included in the rate of relevant item. General Instructions.. Grade mentioned is for guidance purpose. All items are for clear span upto Quantity indicated is in quintal required for execution of one unit quantity of relevant item.
In case of Design Mix, cement consumption shall be as per approved mix. However, indicative cement consumption has been given. General Instructions … Contd…. Shuttering shall be paid only for the area coming in contact with the concrete surface. These items shall not be used for any work other than bridge works. New items may have to be derived by Railways, if there is rate difference in different species. Operating Instructions …. Therefore, only the competent and authorized person shall be allowed to access the soft copies of these documents.
Further, second dialogue box will appear, where "Continue" command shall be given. Make the changes in the file "Basic Rate Sheet". Changes are possible only in the rate column. It will ask for a password for making changes.
This is the most important stage and Railways must ensure that password is suitably secured. Contd… d. After making all the required changes in the basic input rates, all files must be saved one by one and then closed one by one. The sequence of opening of file shall be strictly followed as given above. Any deviation from the procedure as given above may cause errors. The closing sequence would be the same as the opening sequence. Can be done with the approval of Railway Board only.
In case, any Zonal Railway finds any discrepancy in SOR Items or Specifications which is creating problem in execution of that particular item, it should form a Committee consisting of two nominated Chief Engineers, one each of Open Line and Construction Unit, who should study the problem and give its recommendations. Recommendations of this Committee, duly recommended by Principal Chief Engineer of Zonal Railway shall be forwarded to Land Management Directorate is dealing with the subject At present.
Railway Board will issue necessary amendment to all Railways after considering the proposal. The committee shall also scrutinise the AOR.
For this purpose, the item may not be deleted from SOR; but only a letter under the signature of PCE shall be circulated to all concerned on his Railway, informing list of items which shall not be operated by field units.
Pipes and fittings made from Polypropylene Random Copolymer exhibit superior performance for hot and cold water plumbing of residential buildings, commercial complexes, offices and hotels. The UPVC versions often replace wood when building window frames and sills. The UPVC pipe variant also often replaces pipes made of cast iron for drains, waste piping, downspouts and gutters.
It's the best substitute for all-plastic pipe, copper pipe and Galvanized pipe. In conjunction with plain barbed wire and steel pickets it is used to form military wire obstacles. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent.
They are easily worked, moulded and thermoformed. Because of these properties, polycarbonates find many applications. It's 30 times more impact resistant than acrylic sheet plastic. It's half the weight of glass, durable, energy efficient and easy to fabricate.
It's the perfect choice for glazing, skylights, store fronts, covered walkways, machine guards, displays, and personal security applications. Zinc coating is the most effective and economic means to protect the steel substrate exposed to atmospheric corroding environments. It protects the steel substrate by acting as a barrier against the corrosive environment and by sacrificially corroding themselves to provide cathodic protection.
Paints improve the surface life of underlying zinc coating acting as a barrier against zinc reaction with environmental agents.
Cracks, crater, and pin holes occurring in the paint are sealed by corroded zinc products. This method of curing is termed as membrane curing. A membrane will prevent the evaporation of water from the concrete. The membrane can be either in solid or liquid form. Bituminised water proof papers, wax emulsions, bitumen emulsions and plastic films are the common types of membrane used.
Galvolume sheet roofing Item No. Applied by the traditional hot- dipping process, the product is ideal for applications that require superior corrosion resistance and heat reflectivity. Applied by the traditional hot-dipping process, the product is ideal for applications that require superior corrosion resistance and heat reflectivity.
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