Provide with oil lubrication system including oil level indicator. Seals
shall be single, mechanical type of the inside, balanced design. Seal face
materials shall be selected to provide long life in the service intended.
Factory-installed seal water piping shall be provided from pump discharge
to inlet connection on seal housing as required to cool and lubricate the
seal faces. Seal water loop shall include a valve or orifice to control
flow. Provide a spare seal for each pump. Support frames for vertically
split pumps shall be fabricated of structural steel and heavy plate
extending the length of pump and driver, rigid enough to maintain alignment
of machinery, and designed to adequately support equipment under all
operating conditions without grout fill inside of the frame. Frame shall
not be covered with a thin steel plate which requires grouting under the
plate, but the frame may be filled with concrete as required for drainage.
Grout shall be required under the basic frame only. Contractor to provide
one inch minimum drain in the perimeter of the frame.
Drawings shall
indicate the required concrete fill lines for drainage. The pump shall be
dowelled to the frame in the shop, the driver will be dowelled in the field
by others. Furnish bolts or screws for attaching pumps and motor drives to
the support frame. Frames shall have grouting holes, 100 mm 4 inch minimum
size, to facilitate proper grouting. Materials of construction shall be as
specified.
Part Name Material
Casing
Cast iron or steel, ASTM A 48M ASTM A 48
Impeller
Bronze, ASTM B 584
Shaft
Heat-treated carbon, or stainless steel,
ASTM A 276, Type 410
Shaft Sleeve
11-13 percent chrome steel, 450 minimum Brinell
hardness, ASTM A 743/A 743M
Casing rings
Bronze, ASTM B 103/B 103M
Impeller rings Bronze, ASTM B 103/B 103M
Baseplate Steel, ASTM A 36/A 36M
2.10.1.4
Vertical Wet Pit Pumps
Vertical wet pit pumps shall be end suction, single-stage, single-suction
centrifugal of the volute type. Pump trim shall be 316L stainless steel
designed for continuous operation at specified operating conditions. Pumps
shall be frame mounted with pump shaft carried on its own bearings with
multiple V-belt drive between pump and motor. Provide suitable connections
on the frame for lifting and lowering of the pump. Pump casing, pipe shaft
column, discharge piping, and submerged materials, shall be rubber-coated a
minimum of 6 mm 1/4 inch thick. Pump casing shall be split perpendicular
to shaft. Provide renewable impeller wear rings locked against rotation.
Casing shall have replaceable rubber liner, minimum 10 mm 3/8 inch thick
designed for long life under operating conditions specified. Casing shall
be rubber covered. Pump impeller shall be enclosed type of soft natural
rubber on steel skeleton. Pump shaft shall be provided with hardened
(minimum 450 BHN) stainless-steel shaft sleeves designed to prevent water
leakage between shaft and sleeve. Sleeve shall be adequately anchored to
the shaft to prevent any rotation of the sleeve relative to the shaft.
Shaft shall be keyed on the driven end for easy removal of the coupling
half. Shaft shall be completely encased along its entire length by the
impeller and shaft sleeves. Shaft shall have fillets for changes in
diameter. Shaft shall be designed to carry torsional and axial thrust
loads. Shaft shall be one-piece construction. Shaft support column shall
be rubber covered. Upper bearing assembly shall be ball or tapered-roller
type, mounted in an oil-filled or grease-filled housing. Include adequate
SECTION 15864N
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