Rotary Air Lock Valves
Knife Gate Valves
Double Flap Valves
 Plough for Sugar Machines
Plough for Sugar Centrifuges
Disc Spring Hanger Assemblies
Slide Gate Valves

4.2.3          It shall be clearly specified in the bid documents that the supplier of elastomeric bearings shall provide. with                   their quotations the details of the break up of quoted rates including the prevailing price of imported raw                   elastomer used by them for the manufacture of elastomeric bearings, to arrive at the quoted rate of the                   finished bearings per cubic centimeter.

4.2.4           Not with standing the provision of clause 918.3.2 of IRC 83 (part-H), it is hereby specified that for every lot                   of less than 24 bearings, an extra bearing shall be manufactured and, out of the lot, one bearing will be                    selected at random for carrying out material tests. This bearing shall be excluded from the accepted lot for                   the purpose of payment.

4.2.5           Polymer identification test as per clause 915.1.5 of IRC 83 (part 11)- 1987 is mandatory. The manufacturer                    shall get the test done through a recognized laboratory having the facility of Infrared Spectrophotometry                   and the spectra shall be comparable to a reference sample of polychloroprene. The test shall be carried out                   on the core of the elastomeric bearings i.e on the material to be obtained by removing the three layers.

4.3              Pot cum PTFE Bearings

                   The pot being the most important component of the Pot cum PTFE bearing, the user agency shall ensure                    that proper casting facilities for castinq of the pot are available with the selected supplier in his casting unit.

4.4.            The following undertaking shall be taken from Suppliers of Elastomeric and Pot / pot-cum PTFE bearing.

(a)              "We undertake to use ------------(Name of Chloroprene)------------ in the manufacturing of the bearings and                   that the same shall be imported by us directly from ------------ (name of Manufacturer)-------------- I purchased                   from------- (Name of Agent)-------------- who is the authorized Indian agent of M/s--------------
                   (Name of the Manufactu rer)-----

(b)              "We hereby guarantee against defective materials manufactured, workmanship as well as certify quality                    assurance  at every step of manufacturing of ---------- (Nos.). Elastomeric bearings that may be supplied by                    us as per this office and which shall be installed at the --------------------(Name of the Bridge)---------- fora                   period of 15 years, under normal loading, normal traffic and routine maintenance. We also stand guarantee                    for free repair and replacement. (including the cost of placing the new bearings in position) in part or fuiI. lf                   any defect is found, in the bearings or part there of within the period 36 months from the date of supply or                   24 months from the date of installation, whichever is earlier, except for defects arising out of theft, pilferage,                   floods, earthquake or any other natural calamity etc. over which we have no control."

(c)              "We also give an undertaking that the entire manufacturing and testing process shall be open to inspection                   by the agents of the State / UT PWDs / NHAI or their authorized representatives and that all possible help                   shall be  extended in conducting the relevant tests required as per IRC: 83 (Part-II)-1987 and other                   instructions issued by the Ministry of Road Transport & Highways from time to time."

6.               The user agencies are requested to inform the Ministry regularly about the failure of bearings along with the                   name of manufacturers.

7.               This empanelment of manufacturing firms I authorized suppliers of bearings for bridges on National Highways                   and other centrally sponsored schemes will be valid up to 22nd July 2012 or until further order of the                   Ministry, whichever is earlier.