Continental 451 User Manual
Values, dimensions and reference in this brochure are approximate and intended as guide only, not for construction and are subject to change without notice
DETAILED ENGINEERING DESCRIPTION - CONTINENTAL INDUSTRIE
DEB451EN – 06/2012
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DETAILED ENGINEERING DESCRIPTION AND MECHANICAL
FEATURES OF CONTINENTAL INDUSTRIE MULTISTAGE CENTRIFUGAL
BLOWER MODEL
451
I - BLOWER HOUSING
The centrifugal blower housing consists of an inlet head with special feature to direct air to
inlet of first impeller, an outlet head of special design to eliminate friction and multiple
intermediate sections. These parts are made in cast iron EN-GJL-250 (ASTM A48-35B) according
to rigid Continental Industrie specifications, extreme care to be exercised in assembly of
interlocking cast iron EN-GJL-250 (ASTM A48-35B) intermediate sections and annular diffusers
(baffles).
The heads are provided with integral mounting legs and rugged tie-rod lugs. The entire
assembly is securely held together actually with multiple tension rods which bind the entire
housing into a solid integral unit.
1.0 Inlet head
1.1 Flange connection DN 400, PN 10 (16”)
1.2 Cast iron EN-GJL-250 (ASTM A48-35B)
1.3 Minimum wall thickness: 13 mm (0.50”)
1.4 Can be supplied in various flange positions relative to the vertical centre line in
increments of 90° (option).
2.0 Outlet head
2.1 Flange connection DN 350, PN 10 (14”)
2.2 Cast iron EN-GJL-250 (ASTM A48-35B)
2.3 Minimum wall thickness: 13 mm (0.50”)
2.4 Can be supplied in various flange positions relative to the vertical centre line in
increments of 90° (option).
2.5 Has eight integrally cast reinforcing ribs surrounding the volute contour and joining
up to the bearing housing mounting face for strength and to minimize vibration.
2.6 Has pipe connection to vent balancing piston leakage to inlet.
3.0 Intermediate section
3.1 Cast iron EN-GJL-250 (ASTM A48-35B)
3.2 Each intermediate section is cast in one piece
3.3 Each section has twelve evenly spaced integrally cast ribs for increased strength.
Increased surface area allows for proper heat dissipation.
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Values, dimensions and reference in this brochure are approximate and intended as guide only, not for construction and are subject to change without notice
DETAILED ENGINEERING DESCRIPTION - CONTINENTAL INDUSTRIE
DEB451EN – 06/2012
2/4
4.0 Bearing housing
The outboard bearing housings are cast iron and bolted to the outside of the head sections
insuring cool operation of bearings.
4.1 Cast iron EN-GJL-250 (ASTM A48-35B)
4.2 Two cored openings are provided to allow circulation of air (except for gas).
4.3 Has cast fins to improve rigidity and increase heat dissipation
4.4 Labyrinth type oil seal. Oil passages are generously sized to allow optimum
recirculation.
4.5 Has air vent and magnetic plug at the bottom of the oil reservoir.
4.6 Provided with 4 tapped holes in the housing flange to act as bearing puller.
N.B. : When the inlet air or gas temperature is too high, we can adapt as option special
bearing housings with a water or air cooling system (technical drawing on request).
5.0 Bearings
5.1 The rotor assembly is supported by 2 heavy duty oil lubricated ball bearings, single
row, sized to withstand the thrust load also type SKF or FAG.
5.2 Sized for minimum 10 years of operation (Direct Drive only), following SKF L10
bearing life calculation method.
5.3 Bearings are mounted in outboard type bearing housings and located so that
bearings may be serviced without disassembling the blower casing.
6.0 Shaft
6.1 42CrMo4 (AISI4140) carbon steel shaft, heat treated, straightened and stressrelieved.
6.2 Shaft is ground all over
6.3 Stiff shaft design to minimize vibration
6.4 The diameter of the shaft end is 70 mm (2” 3/4)
7.0 Shaft seals
7.1 Shaft sealing is accomplished using carbon ring seals
8.0 Impellers
8.1 One piece cast aluminium EN AC-43100 (AISI 360.1)
8.2 For minimum corrosion all aluminium alloys are non copper alloys
8.3 The outer diameter of the impeller is 736.5 mm (29”)
8.4 Each impeller is automatically sanded or blasted when leaving the foundry before
the machining
8.5 Each impeller is statically balanced.
8.6 Impeller tip speed : 138 m/sec (452 FPS) at 3570 rpm.
8.7 First critical speed (8 stages) 4203 rpm.
8.8 Impeller assembly : to consist of a heavy steel shaft accurately machined and one
or more aluminium alloy cast impeller, statically balanced, securely keyed to shaft
and held in place by lockwashers and locknuts.
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