purchase of 250 nb cast basalt lined pipe line for installation in pressure conveying line of ash handling plant of unit no 10 and 11 stps, sarni. purchase of 250 nb cast basalt lined pipe line for installation in pressure conveying line of ash handling plant of unit no 10 and 11 stps, sarni. , 250 nbcast basaltlined pipes with compatible flange & fasteners size-id- 250 mm, od-324 mm, length – 2 mtrs cast basalt thickness -- 20+ / -2 mm cast basalt density – 2.8 to 2.9 gm / cc compression strength -- 350 to 450 n / mm2 bending strength -- 30 n / mm2 tensile strength -- 10 mpa hardness -- 8 mohs scale wear ( abrasion ) temp. suitability -- more than 300 deg c. water absorption -- zero percent grout-- mortar casing--5 mm m.s. erw / fabricated pipe / swp material confirming to is-2062 or equivalent and tolerances as per is-3589 fixed flange size-od-445 mm, id-327 mm, thick-18 mm, pcd-405 mm, no. of holes- 12 nos., hole dia- 23 mm matching flange size- od-445 mm, id-276 mm, thick-18 mm, pcd-405 mm, no. of holes- 12 nos., hole dia- 23 mm