Hale DSD - Manual (Page 6)

Bearings
Bearings support and align the impeller shaft for smooth operation. See Figure 1-2.
Pump Body
The standard pump body (Figure 1-2) and related parts are constructed from fine grain alloy cast
iron, with a minimum tensile strength of 30,000 PSI. All moving parts subject to water contact are
of high quality bronze with stainless steel shafts.
The body is split horizontally on a single plane in two sections for easy removal of the entire
impeller assembly, including clearance rings and bearings. The impeller assembly is removed from
the bottom of the pump to avoid interference with the rounding piping and pump mounting on the
apparatus chassis.
The pump has two large suction inlets, on the left and right side. Additional front and rear inlets
may be added as requested by the customer. Impeller inlets are on opposite sides of the pump to
balance axial forces; discharges are on opposite sides to balance radial forces.
Two tank suction on valve locations are available to allow higher flows from the booster tank
Optional built-in check valves we available to prevent tank overpressurizations.
Discharge valves in the basic pump configuration are mounted at either side of the pump body.
However, the pump body provides several additional discharge locations (facing front, back, or up)
that can accommodate optional discharge valves.
Packing
Packing forms a nearly watertight seal at the point where the shaft passes from the inside to the outside
of the pump. See Figure 1-4. Packing material is lubricated with pump water. The packing gland should
not be excessively tightened or the material will lose us built-in lubricant and dry out, which may result in
damage to the pump.
The single packing gland is located on the low pressure side of the pump. Its split design promotes
ease of repacking The packing gland is a full circle thread type to exert uniform pressure on packing
and to prevent cocking and uneven packing load. The packing is easily adjusted with a rod or screw
driver. The packing rings are made of a combination of unique materials and have sacrificial zinc
separators to protect the pump shaft from galvanic corrosion.
Packing material may also deteriorate if the pump is kept dry for long periods of time during winter
months (for example, to prevent freezing). In this case, charging the pump with water at least once
weekly will lubricate the packing. See the Maintenance Instructions in Section 3 for details.
Figure 1-4. Pump Packing
SPLIT PACKING GLAND
PACKING GLAND LOCK
PACKING COOLING PASSAGE
IMPELLER END
(3) .005 THK. FOIL
PACKING SEPARATORS
PER JOINT
(TOTAL 12 REQUIRED)
PACKING HOUSING
(4) 7/16 SQUARE
PACKING RINGS
PACKING LANTERN
SLOTTED PACKING GLAND
PUMP SHAFT