I N S T R U C T I O N S
For the installation and maintenance of DS1525 - DS1550 -
DS2525 - DS2550 desuperheaters
IMI0030E.doc
Rev.4 20/08/12
20090 SEGRATE (MI)- via E.Fermi
EMAIL:
TEL.(02) 269912.1 - FAX.(02) 2692.2452
Page 15 of 17
cylinder so that it is correctly oriented (the nebulised water must be in the same direction as the vapour
flow), then tighten the tightening ring.
9.8 WELDING
Once re-assembled, weld the spray cylinder for improved safety. It is imperative that this operation be
undertaken by a competent welder. A welding procedure specification is available from Carraro on
request. Both TIG and ARC welding are acceptable, and the recommended electrode material is ER
NiCrMo3. At least 4 welds are necessary for the DS1525/DS2525 and at least 8 for the DS1550/DS2550.
They must be 8 mm in length and diametrically opposed. One weld must secure the tightening ring to the
body extension, and the other must secure the spray cylinder to the tightening ring. On completion, check
the welding using appropriate penetrating liquids. There must be no cracks. If necessary, grind and check
again until the weld is satisfactory (see Fig. 8).
Fig. 8
9.9 RE-INSTALLATION
Refit the actuator to the desuperheater, referring to the data noted during disassembly when repositioning
the plunger. Before re-installing the desuperheater check that the surfaces of the unit connection flanges
are completely clean. Insert the desuperheater in the vapour pipe and check that the nozzle is correctly
oriented, with the spray in the direction of the vapour flow. Lubricate the nuts and studs with a suitable
lubricant for high temperatures and tighten uniformly, in accordance with the manufacturer’s instructions.
Before connecting the water supply line, flush the pipe and check that there are no restrictions and no
contamination.
