290 GR CF-8M. Impeller shall have replaceable wearing rings constructed of
11 to 13 percent chrome hardened to 300 BHN. Impeller shall be statically
and dynamically balanced to maximum rated speed. Impeller shall be 95
percent of maximum allowable impeller diameter.]
2.8.2.5
Pump Shaft
[Pump shaft and shaft sleeve for horizontal pumps shall be constructed of
Type 316 stainless steel. Shaft diameter and design shall be sufficient to
transmit at least 2.5 times rated motor power of the pump.] [The pump
shaft for vertical type pumps shall be one piece and constructed of ASTM A
582/A 582M Type 416 stainless steel. Largest diameter shaft available for
use with selected impeller shall be supplied and shall be able to transmit
at least 2.5 times rated motor power.]
2.8.2.6
Pump Construction
[Pump and bearing frame and housing shall be constructed of cast iron, ASTM
A 48/A 48M.] [Discharge head and suction barrel with mounting flange shall
be constructed of carbon steel, designed per ASME BPVC SEC VIII D1 with a
7.6 mm 300 mil corrosion allowance. Sole plate shall also be provided
constructed of a minimum of 25 mm 1 inch thick carbon steel plate with a
minimum of four 19 mm 3/4 inch anchor bolts. Welds on the pressure
containing section of the pump shall be the full penetration type with
welders and welding procedures per ASME BPVC SEC IX. Suction barrel shall
be sized so that the velocity in the barrel does not exceed 915 mm 3 feet
per second at 150 percent of design flow. Discharge head and can type
shall be the "T" type configuration so that discharge and suction are above
baseplate. Suction barrel shall be of sufficient length to accommodate
installation of 2 additional turbine stages.]
2.8.2.7
Pump Column
Pump column shall be flanged and constructed of carbon steel. Pump column
assembly shall be designed to withstand 4.1 MPa 600 psig and incorporate
7.6 mm 300 mil corrosion allowance. Bearing retainers located in the pump
column shall be constructed in a manner that will assure concentric
alignment of the shaft within 0.13 mm 0.005 inches.
2.8.2.8
Miscellaneous Hardware
Bolts, lock washers, nuts and miscellaneous hardware used with casing, pump
frame and gland shall be Type 316 stainless steel.
2.8.2.9
Shaft Sealing System
Pump shall be equipped with effective mechanical shaft seal to seal against
discharge pressure when pump is operating. Seals shall be cartridge type
with Hastalloy "C" bellows mounted on Type 316 stainless steel shaft
sleeve. Seal faces shall be tungsten carbide versus silicon carbide. One
spare mechanical seal shall be provided. Gland shall be flush vent and
drain type constructed of ASTM A 276 Type 316 stainless steel. Bypass
line, constructed of ASTM A 269 Type 316 stainless steel, from the stuffing
box to the suction side of the pump shall also be provided.
2.8.2.10
Pump Bearings
[Horizontal end suction pump bearings shall be anti-friction type and shall
operate in oil bath. Pump bearings shall be designed for radial and
SECTION 15561A
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