DESMI DSL Vertical Inline Spacer Version
The pump is designed for the high flow capacities up to 4000 m³/h. Manufacturing shall be vertical in-line, & single-stage, radially split, double suction centrifugal pump with connecting flanges according to international standards. Installation without alignment is required. Vertical design especially is recommended where small overall ground floor is available. The design of the suction side provides for a perfect flow, and the inlet is placed in line with the outlet.
The design shall incorporate advanced double-suction, closed impeller with double-curved blades, with a helical pump casing in one casting - resulting in high efficiency and low NPSH-values.
The pump haft to be designed for mounting with electric motors having different international flange dimensions acc. to DIN, ANSI or JIS. The pump casings shall be made in ductile cast iron GGG40 EN1561-GJL-400/DIN1693.
The pump casing shall be equipped with a NiAlBz EN1982 CC333G/DIN17656 replaceable sealing ring. Material of the shaft shall always be of high quality duplex stainless steel AISI329/1.4460. The pumps shall be fitted with bearings and mechanical shaft seal at both top and bottom. This gives a robust construction, designed for trouble-free continuous duty.
The impeller shall be made in NiAlBz EN1982 CC333G/DIN17656 (as standard) or duplex stainless steel AISI329/1.4460 for Scrupper applications both with double-curved blades to ensure low NPSH-values and high efficiency. Shaft material shall be of duplex stainless steel AISI329/1.4460 with a single acting, mechanical shaft seal, which seals off the liquid cavity at the motor shaft.
The pump needs to be equipped with a spacer coupling, which is a combined distance and flexible coupling between drive unit and electric motor. This makes it possible to remove the complete bearing housing with shaft, bearings, shaft seal and impeller – without dismantling the motor or pump from the piping. This represent significant advantages to the end user, who with this pump solution secures his installation trouble free maintenance with minimum down time.
For added efficiency the internal pump casing and impeller can be coated for reduction of friction and thus increase in energy efficiency.
As extra equipment the pump may be mounted with a priming pump of the water ring type, complete with
filter and feed water tank, or it may be delivered with an ejector pump.
DESMI have manufactured pumps for District Energy in bigger scale since 1950, has ISO 9000 certification – and own branches, distributing partners and service providers in most markets around the world. DESMI have key focus on energy efficient solutions (often up to 85%) with easy maintenance, low downtime and a long life cycle. DESMI’s location in Denmark, the country with most experience and latest technology within District Energy is a huge advantage for our company – as we are constantly dealing with leading consultants and utility /energy companies, helping us to raise our game even further.