procurement of spares required for chp, bina project.- spares,components, assy, sub assy. -technical specifications- 1) material composition of shell of carrying roller as per is : 1762-1961, is: 4643-1968, cast steel, ultrasonically tested, hardness- 48 to 52 rc- 01 nos. 2) material composition of housing of roller- as per is 1762-1961 and is: 4643-1968, cast steel, ultrasonically tested, hardness- 48 to 52 rc- 02 nos. 3) material composition of shaft: en-24, bs:970/is:3930-1966, hardness- 48to 53 rc- 01 nos. 4 ) o ring of neoprene rubber- 02 nos 5 ) material composition of bush- gun metal (gm) bs-1400lg2- 02 nos 6) both side housing hub- is2707 grade ii, cast steel- 02 nos. 7) track rollers shoud be life time lubricated with oil and duo cone seal fro prolonged life. 8) all material should be tested from navl approved testing laboratory.
