contract shall be shop fabricated, all-welded construction of carbon steel
with a minimum shall thickness of 6 mm 1/4 inch. Structural design
requirements of paragraph entitled "Structural and Miscellaneous Steel"
including seismic design, are applicable to tanks furnished.
2.10
PUMPS, VALVES, MOTORS
Centrifugal pumps shall be used for applications for which unique flow and
head requirements necessitate the use of positive displacement pumps. The
general requirements specified in this paragraph shall be applicable to
pumps furnished except as specifically noted. Positive displacement pumps
furnished for use with lime slurry shall have a history of reliable
operation for that application at pilot plant or commercial installations.
Positive displacement slurry pumps for which shaft seals are necessary
shall be provided with mechanical seals which do not require the use of
seal water which could infiltrate into the slurry. Provide piping, valves,
and fittings required to connect the spray dryer absorbers, lime slurry
preparation system, fabric filter baghouses, pumps, and tanks complete with
hangers and connection for instruments, vents, flushing, and drains as
required. Provide properly sized bypasses for equipment and control
valves. Instrumentation and controls shall be as specified in paragraph
entitled "Instructural and Controls." Piping materials and fabrication
shall conform to ASME B31.1 (Power Piping Code). Furnish alternating
current high efficiency electric motors required to drive the equipment
furnished under this Contract. Provide each pump assembly with the
manufacturer's standard finish. Protect exposed machine surfaces with a
rust-preventative compound. Cover flanged openings with plywood covers
held by a minimum of four bolts. Plug or cap screwed connections with
standard fittings.
2.10.1
Pumps
Furnish the pumps required or specified complete with motor drives,
accessories, and field service. Provide 100 percent installed spare
capacity for pumps. Provide water pumps for slaking water and cooling
water supply as shown on the process flow diagram. These locate pumps at
the water storage tanks to be provided by the Contractor. For purposes of
the proposal, these tanks shall be assumed to be located at grade at a
distance of 18.30 meters 60 feet from the piping interface point indicated.
Contractor shall provide piping from these tanks to the points of
application within his system. Each pump assembly shall include pump,
driving motor, baseplate, drive coupling or multiple V-belt drive, and
coupling guard, as applicable. Include dowelling of pumps to baseplate.
Each pump shall be of a design and construction for service intended.
Overhead motor mounting structure shall have provision for drive belt
tension adjustment. Structure shall be such that motor and mounting are
supported independently of the pump bearing assembly. Provide structure to
allow for removal of pump bearing assembly without disturbing the motor.
Structure shall be of fabricated steel, and shall provide support for
V-belt drive guard. Drive couplings and matched multiple V-belt drive
(MVD) sets shall be rated at not less than 140 percent of the motor power.
Guard for matched MVD sets shall have solid metal cover on pump side and
expanded metal mesh on outboard end. Flexible drive coupling guards shall
comply with applicable safety requirements. Flexible coupling guards shall
be arranged for ease in disassembly or removal for access to couplings.
Coupling guards shall be rigidly fastened to baseplate. Prevent any
external thrust from being transmitted to the motor shaft under any
operating conditions. Provide double-screw adjustment bases on
nonadjustable horizontal arrangements. Suction and discharge connections
SECTION 15864N
Page 56
Previous Page
