Abstract: This steam separator superheater comprises a horizontal axis cylindrical shell (1) enclosing in its lower portion a steam and moisture separator and in its upper portion a two-stage steam superheater resting on running paths supported half way up the shell by a frame (5). Each stage of the steam superheater is constituted by two bundles of hair-pin bent tubes (15, 16 and 17, 18) supplied with superheat steam from steam chests (43, 44, 45, 46). The upper stage rests on the lower stage. Both stages are inserted into the shell via sleeves (47, 48) outside the shell and extending loading openings made through an end plate (2) of the shell. The upper stage is lifted into position by lifting gear outside the shell (1) acting by means of lifting lines passing through passages (49) in the shell. The passages are closed by caps (51) when the separator superheater is in use.