SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6511
SUGGESTED SPECIFICATIONS
PART 1 GENERAL
1.1 DESCRIPTION
Work Included: Under this section, the contractor shall provide all labor, equipment and
material necessary to furnish, install, test and place in operation Vertical Dry-Pit Pumping
Units designed for wastewater service as shown in the plans and as specified herein.
Other Project Specific Work
1.2 Related Work Described Elsewhere: Project Specific
1.3 GENERAL
Furnish and install _______ Vertical Flexible Shaft Driven Dry Pit Pumping Units complete with all
accessories and appurtenances as shown in the plans and specified herein or as required for
a complete operating system. Each Pumping Unit shall be rated for continuous duty in
accordance with the operating conditions defined in Table 1 of these specifications. Each unit
shall be furnished with pump, driver, motor support base with guard and flexible intermediate
drive shaft with necessary steady bearing(s) and shaft guard.
1.4 QUALITY ASSURANCE
Qualifications of Manufacturers: The pumps shown and specified are based on the products
manufactured by Yeomans Pump, Aurora, Illinois. Catalog numbers and references are
given only as an indication of the quality of materials and workmanship to be used. Pumps
are to be engineered and manufactured under a written Quality Assurance program. The
Quality Assurance program is to have been in effect for at least five (5) years and shall
include a written record of periodic internal and external audits to confirm compliance with
such program.
1.5 QUALITY CONTROL
The Dry Pit Pumping Units shall conform to all applicable requirements of ASTM, ANSI and
Hydraulic Institute. For purposes of this specification, the revision and/or version of the
referenced standards in effect on the date of public bid opening shall apply.
The Dry Pit Pumping Units specified shall be the products of reputable manufacturers who
have been regularly engaged in the design, manufacture and furnishing of Wastewater
Pumping Equipment for at least ten (10) years. The manufacturer of the pump shall assume
full responsibility for compatibility of the supplied components with the application.
PART 2 PUMP CONSTRUCTION
2.1 CASING
Note: Delete reference to raw sewage if not applicable and insert the fluid type.
The casing shall be designed for handling (raw sewage) and shall be of cast iron conforming
to ASTM A48, Class 30 or better, of sufficient thickness and suitably ribbed to withstand all
stresses and strains of service at full operating pressure The volute shall
SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6512
be side-flanged, tangential discharge and designed to be installed at positions of 45 degree
increments. A handhole shall be provided in the casing to provide convenient access to the
impeller and interior parts of the pump. The inner contours of the handhole cover shall match
the contours of the casing. No stationary guides or splitters will be permitted on either the
suction or discharge sides of the casing. The casing shall be provided with tapped and
plugged (removable) vent, drain, and gauge connections. The discharge connection shall be
a 125 lb. standard raised face flange positioned as indicated on the Drawings.
2.2 IMPELLER
The impeller shall be balanced non-clogging type made of close-grained cast iron conforming
to ASTM A48 Class 30 or better. The impeller shall be single suction, enclosed, two to four
vane, radial flow design with well rounded leading vanes and then tapered toward the trailing
edge for a circular flow pattern. The waterways through the impeller shall have extremely
smooth contours, devoid of sharp corners, so as to prevent rags or stringy, fibrous material
from catching or dogging. Wiper vanes are required on the back shroud of the impeller to
minimize end thrust and reduce pressure on the stuffing box.
The impeller shall be cast in one piece and shall be dynamically balanced. Rotation of the
impeller shall correspond to the pump discharge orientation as indicated on the Drawings.
The design of the impeller and the shape of the blades shall be such that rags or similar
materials will not dog the pump or seriously affect the efficiency. The impeller shall be keyed
to the shaft and firmly held in place by a streamlined 316 stainless steel or bronze locking
device. The arrangement shall be such that the impeller cannot be loosened by torque from
either forward or reverse rotation.
2.3 WEAR RINGS (Optional)
Removable hardened stainless steel wear rings shall be provided for both the suction cover
and the impeller, with the wearing surfaces normal to the axis of rotation. They shall be
securely fastened with counter-sunk, machine-head, stainless steel screws to prevent any
relative motions and designed for easy replacement. Both wear rings shall be a minimum of
318 inch thick and shall be made of hardened 400 series stainless steel, with the impeller ring
hardened to 325 to 375 Brinell and the casing ring hardened to 425 to 475 BrinelI and
designed to compensate for a minimum of one-quarter inch wear.
2.4 STUFFING BOX
The stuffing box shall be readily accessible and its construction shall permit the use of either
a standard commercially available mechanical seal or teflon seal ring and packing without
special machining. The stuffing box shall be designed for a minimum of live (5) rings of
packing in addition to a seal ring and suitable for use of clean water for sealing. The stuffing
box shall be provided with a split removable cast iron (bronze) gland to facilitate packing
replacement. The seal ring shall be located adjacent to and on the outboard side of the
second packing ring. The stuffing box shall be drilled and tapped for a 1/4 inch minimum
water seal connection. The seal ring shall be a split ring, 25 percent glass filled TFE type, of
sufficient strength for the intended service, drilled and tapped for easy removal, and suitably
positioned to assure uniform distribution of the sealing medium. The top of the pump casing
cover shall be provided with a lip suitable for use as a reservoir to retain stuffing box leakage
and a 112 inch minimum NPT tapped hole to permit leakage to be drained away.
SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6513
2.5 PUMP SHAFT
The pump shaft shall be made from high grade heat treated alloy steel, rigid shaft type, of
sufficient size to transmit the full driver horsepower with a liberal safety factor, accurately
machined over its entire length and free from any harmful or damaging vibrations. The pump
shaft shall include a tapered end for positive alignment and ease of removal at the impeller
hub. Shaft deflection shall not exceed .002 inch at the stuffing box at + 40% of the best
efficiency point of the impeller curve furnishedA renewable stainless steel shaft sleeve shall
be provided extending from the impeller hub through the stuffing box. The shaft sleeve shall
be internally ground and positively secured to the shaft to prevent relative rotation. Passage
of water between the shaft and sleeve shall be prevented by 0-ring or other approved means.
Shrink fit shaft sleeves will not be acceptable. The shaft sleeve shall be hardened 400 series
stainless steel with a 425 to 450 Brinell hardness and a 32 micro-inch surface finish.
2.6 PUMP BEARINGS
The pump shall be provided with radial and thrust anti-friction ball or tapered-spherical roller
type bearings of ample size to carryall loads imposed under continuous operation without
overheating The bearings shall be grease lubricated and a relief port lip seal shall be provided
so that excessive grease pressure will not damage the bearings. The pump bearing frame
shall be designed so that the complete rotating element can be removed from the pump
casing without disconnecting of the suction or discharge piping. The bearings shall be
designed in accordance with AFBMA standards for a minimum L-10 life of 40,000 hours at the
most extreme operating points on the pump performance curve and a minimum of 100,000
hours at the primary duty point.
2.7 BEARING FRAME
The pump bearing frame shall be made of ASTM A48 Class 30 cast iron material. The
bearing frame shall be shoulder fitted, accurately centered and rigidly fixed to the pump
casing and backplate. The bearing frame shall contain jacking bolts and shims for the axial
adjustment of the rotating element when necessary to provide the manufacturers
recommended clearance between the impeller and suction cover over the life of the pump.
2.8 SUCTION AND BACKPLATE
The suction and backplate shall be of the same material as the casing, cast separate from the
volute and built to allow complete removal of the bearings, shaft and impeller without
disturbing the pump suction or discharge piping connections. The suction and backplate shall
be shoulder fitted to the casing and assembled with studs to assure accurate alignment. The
backplate shall be designed to support the rotating assembly and shall have a convertible
stuffing box of ample depth and design to accommodate either a mechanical seal or packing.
The suction plate shall include a suction elbow which shall be provided with a handhole. The
inner contours of the handhole cover shall match the contours of the suction elbow. The pump
suction shall be of the size specified; 125 lb. standard raised face flanged and shall be
provided without the use of pipe adaptors.
SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6514
2.9 PUMP SUPPORT
The pump support system shall be of sufficient size, strength and ridgity to support the unit
and prevent harmful or damaging vibration. The fabricated steel base shall be anchored to
the concrete floor/pad using a minimum of four stainless steel anchor bolts.
PART 3 DRIVESHAFT
3.1 SHAFTING
The driver output shaft shall be connected to the pump by means of vertical universal joint
type heavy duty industrial drive shafting. The vertical drive output shaft shall be fitted with a
steel flange bored undersize creating an interference fit. The bottom universal joint shall be
provided with a slip joint with sliding splines to permit removal of the pump rotating assembly
without removing the drive shafting. The universal joint shall be connected to the pump shaft
by means of a steel companion flange bored for a slip fit tolerance (plus 0.001 inch. minus
0.000 inch).
Tubular shafts shall be welded to rigid flanges, or stub shafts with tapered ends, to facilitate
maintenance and replacement of wearing parts. Each section of shafting shall be dynamically
balanced, including flanges, shafting, keys and bolts. Balancing shall be accomplished by
weight addition.
3.2 INTERMEDIATE LINESHAFT BEARINGS
When multiple sections of lineshaft are required, suitable pillow-block type intermediate
steady bearings shall be provided. The steady bearings shall be installed on the "B" shaft
section(s) prior to dynamic balancing. The steady bearings shall be designed in accordance
with AFBMA standards for a minimum L-1 0 life of 8,000 hours.
3.3 SAFETY GUARD
The drive shaft shall be provided with an easily removable, 48 inch vertical screen-type
OHSA approved guard. The guard shall be mounted to the pump bearing housing and shall
extend upwards over the lower universal joint and slip joint.
PART 4 MOTOR
Each pump shall be driven by a vertical overhead, independently supported, solid shaft
squirrel cage induction electric motor with a maximum horsepower and speed as specified.
The motor shall be mounted and supported by a fabricated steel support stand with
adequately sized service openings providing easy access to the coupling flange. The motor
shall have a (ODP) (TEFC) (TEXP) enclosure and shall meet all the requirements of NEMA,
IEEE and NEC.
Motors shall be rated for ____phase, _________volts, ____hertz electrical service and
shall conform to all applicable requirements of Div. 16.
SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6515
PART 5 TESTING
5.1 The natural frequency of the assembled pump and its supporting structure shall be at least 25
percent higher than the maximum pump excitation frequency. The pump shall operate within
the vibration limits of the Hydraulic Institute
5.2 The pumps shall be performance tested at the manufacturer’s plant before shipment in
accordance with Hydraulic Institute standards. Upon request, certified copies of the test
curves shall be submitted to the engineer.
5.3 Each pump shall be hydrostatically tested at the manufacturer’s plant before shipment in
accordance with Hydraulic Institute standards. Upon request, certified copies of the test
results shall be submitted to the engineer.
PART 6 FIELD SERVICE
Days of Field Service shall be provided by an authorized, factory trained representative of the
Pump Manufacturer. Services shall include, but not necessarily be limited to, inspection of the
completed installation to ensure that it has been performed in accordance with the manufacturers
instructions and recommendations, supervision of all field testing and activation of the
Manufacturer’s Prescribed Warranty.
The Contractor shall be responsible for coordinating the required field services with the Pump
Manufacturer.
END OF SECTION
SERIES 6250
3905 Enterprise Ct.
Aurora, IL 60504
PH: 630-236-5500
FX:630-236-5511
VERTICAL LINE-SHAFT
NON-CLOG PUMPS
Issue 8/95 6516