procurement of bibby resilience coupling and spare grid spring for pa sa fan and coal mill gear box for unit 1 to 4 of ph i and ii at sgtps mppgcl birsinghpur , spares grid spring for pa fan coupling size :- 290a , sa fan coupling with grid spring size :- 124a , spare grid spring for sa fan coupling size :- 124a , greaves make gear box (8.5 e-9 abl coal mill coupling with grid spring: shaft dia. – 95 mm size :- 318fk , spares grid spring for greaves make gear box (one set consists of 4 nos. segments) size :- 318fk , pa fan coupling (complete coupling with grid spring) w.b coupling-266 type a, no. of teeth-48, dia over teeth-280 mm, perimeter-892 mm, specification of motor:- rpm.-1478, 390 kw bore size :- motor side: 109.98 mm f fan side :100 mm f key way:- motor side: l-180, w-28, d-16 fan side:l-180, w-28, d-16 , bibby coupling for motor and greaves make mill gear box with finished bore. bore size :key way motor side: 109.97 mm l-180, w-28, d-16. gear box side:(old bore size) material-c-45 model greaves 310fk or equivalent , grid spring set suitable for bibby coupling, as above for gear box. (each set consisting of 4 element) material -spring steel , grid spring set for seal air fan coupling rpm-1450, rating-37kw, no of teeth-56, dia over teeth-170mm (each set consists of 2 element) reso flex –r 31v/168a(w.b.)