supply of quad calandria , calandria:- as per existing calandria , a new mild steel fabricated calandria for evaporator body of heating surface 560m2 with central down take and with juice feeding/distributing coil . the calandria shell should be 12mm and mild steel tube plate having 45mm holes drilled & perfectly reemed shall be 32 mm thick . nos of tubes 2240 & tube length between the tube plate shall be 1885 mm having ligament not less than 13mm . calandria shall have proper galleries for steam distribution & adequate 6 nos of nox gas with drawl connections for heavy & light nox gases . the calandria shall have 610 mm steam/vapor inlet connection with vapor jacket and proper size condensate box fitted with calandria for condensate with drawl . the inside dia of the calandria shall be 3330 mm , dia of down take 750 mm and calandria shall have at least 150/100 mm color above & below tube plate for welding with the vapor space body & bottom saucer of the evaporator . the calandria shell have minimum 06 nos of tie rod between top & bottom tube plates .