VERTICAL TURBINE PUMPS
PART 1 - GENERAL
1.1 WORK INCLUDED
A. The Contractor shall furnish, install and test barrel booster type vertical turbine pumps complete with drive motor and all appurtenances as indicated on the Drawings and as specified herein. These Specifications direct attention to certain features of the pumping unit but do not cover all the details of their design. The equipment furnished shall be designed, constructed and installed in conformity with accepted high quality standards. All components of the vertical turbine pump including the pump, drive motor, bearings, shafting, coupling, accessories, appurtenances and all associated equipment shall be compatible.
B. The pumps as indicated in this section of the work herein specified include:
1. Pump.
2. Motor.
3. Discharge head.
4. Mounting base, anchors, and seals.
5. Shafting, bearings, and couplings.
6. Lifting attachments, lubricators, and drainage connections.
7. All accessories and appurtenances.
8. Installation.
9. Adjustment and start-up.
1.2 RELATED WORK
A. Section 09900 - Painting. B. Division 16 - Electrical.
1.3 REFERENCES
A. ANSI B58.1-71 - Deep Well Vertical Turbine Pumps. B. ASA - Applicable specifications.
C. NEMA Standards - Weather Protected Enclosure, Type I.
1.4 SUBMITTALS
A. Descriptive literature, catalog cuts, dimension prints, shop drawings, and installation, operation and maintenance instructions shall be submitted to the Engineer for review before shipment.
The data shown on the shop drawings shall be complete with respect to dimensions, materials of construction, wiring diagrams, and the like, to enable the Engineer to review the information as required. At the time of submission, the Contractor shall, in writing, call the Engineer's attention to any deviations that the Drawings may have from the requirements of these Specifications.
B. Contractor shall submit the following information in shop drawings to the Engineer for review. C. Pump Data:
1. Rated capacity, in gallons per minute.
2. Rated head (including column friction), in feet.
3. Speed, in revolutions per minute.
4. Pump efficiency (including shaft and column friction losses) at rated capacity, in percent.
5. Pump horsepower (including shaft and column friction losses) at rated capacity, in horsepower.
6. Minimum submergence required over suction inlet, in feet.
7. Total pump downthrust, in pounds.
8. Impeller shaft diameter, in inches.
9. Lineshaft diameter, in inches.
10. Column pipe diameter (nominal), in inches.
11. Length of column, in feet.
12. Weight of pump, less driver, in pounds.
D. Motor Data:
1. Manufacturer.
2. Motor rating, in horsepower.
3. Full load speed, in revolutions per minute.
4. Type.
5. Type of thrust bearing.
6. Downthrust capacity, in pounds.
7. Voltage.
8. Cycles, in hertz.
9. Phases, in number.
10. Weight of motor, in pounds.
11. Weight of pump and motor, in pounds.
1.5 GUARANTEE
A. The Contractor shall guarantee that the materials and workmanship of the equipment and installation shall be free from defects for a period of not less than one (1) year from the date of acceptance by the Engineer and Owner.
B. The Contractor shall guarantee and warrant that the pumps will operate satisfactorily and continuously in accordance with the pump schedule. If the pump fails to operate satisfactorily the manufacturer shall promptly adjust, regulate, repair or replace the pump unit, at the Contractor's expense, to maintain the guaranteed capacities, efficiencies and performances.
PART 2 - PRODUCTS
2.1 MANUFACTURER
A. The pumping units shall be provided by a single manufacturer with a minimum of five (5) year's experience in designing and manufacturing pumping equipment of similar type, size and capacity.
B. The manufacturer shall have the ability to promptly furnish any and all interchangeable replacement parts as may be needed at any time within the expected life of the pumps. Upon request, the Contractor shall submit evidence of the proposed manufacturer's ability to promptly fill replacement orders.
C. The pumps shall be manufactured by Peerless, Fairbanks Morse, Flowserve, Floway or approved equal.
2.2 PUMP
A. Type: The Contractor shall furnish and install open lineshaft, product lubricated, vertical turbine pumps as indicated by the Drawings and described herein.
B. Discharge Head: The pumps shall be supplied with a UG type discharge constructed of durable cast or ductile iron having flanged discharge opening with Class 125 ANSI flanges. The top diameter of the discharge head shall be of such diameter as to match the diameter of the motor base. Tapped drain opening shall be provided in the discharge head. Discharge shall be below the motor base. Discharge port shall be fitted with the appropriate supports and gussets for restraint as shown on the Drawings and approved by the pump manufacturer.
1. Sole Plate: A sole plate of adequate thickness shall be supplied with each pump. Plate shall be of proper size to support and anchor the motor pedestal. It shall be milled and machined to allow for a smooth level mating surface to the head.
2. Pump Bowls: Bowl assemblies shall consist of a suction bell, one or more intermediate bowls and discharge bowl. Pump bowls shall be accurately aligned with machined registers and shall be finished smooth. The bowls and all guide passages shall be designed and finished to reduce friction losses to a minimum. Water passages shall be lined with smooth vitreous porcelain enamel. Bowls shall be bolted to each other, to the suction bell assembly, and column assembly by machined heavy flanges. The bowl and its bearing housing shall
be in one piece and integrally bored for positive alignment. The bowl and suction bell bearings shall be bronze, ASTM B144-932 (SAE660). The suction bell bearing shall be permanently grease packed for optimum bearing life and protection.
a. Bowls shall be constructed of close grain cast iron having a minimum tensile strength of 30,000 psi. The bowls shall be capable of withstanding a hydrostatic pressure equal to twice the pressure at rated capacity or 1-1/2 time shutoff head, whichever is greater.
b. Each bowl shall be fitted with a lateral bowl seal ring to prevent slippage of water between bowl and impeller. Intermediate bowls are to be constructed by using a bronze bearing and a neoprene bearing to support the impeller shaft. Bowls of lesser construction shall not be considered equal.
C. Impellers: Semi-open or enclosed impeller(s) shall be furnished. The impeller(s) shall be keyed or taper locked to the bowl shaft to provide mechanical reliability and ease of maintenance. Impeller(s) shall be cast in one piece, constructed of bronze (ASTM B584 Alloy), and statically and dynamically balanced. Impeller adjustment shall be provided at the top of the head shaft by means of a bronze adjusting nut of ASTM B584 which shall be positively locked in position.
The impellers shall be adjustable by means of a top shaft nut at the top of the motor.
D. Pump Shaft: The pump impeller shaft shall be turned and polished 416 stainless steel. It shall be supported by bearings above and below each impeller. Bearings are to be lubricated by the water being pumped and shall be of bronze. The size of the shaft shall be no less than that determined by ANSI/AWWA Specifications E101, Section A4.3 paragraph 4.3.3. and shall be ample to transmit the horsepower required by the pump. Mechanical seals shall be furnished. Hollow shafts are not acceptable.
E. Lineshaft: The lineshafts shall be turned 416 stainless steel of a size that conforms to the requirements of ANSI Standard Specifications for Deep Well Vertical Turbine Pumps, Number B58.1-1971. The shaft shall be furnished in interchangeable sections having a nominal length of not over 5 feet. The butting faces shall be machined square to the axis of the shaft. Shafting shall have flame sprayed stainless steel journals at the bearing points. The lineshafts shall be coupled with stainless steel couplings.
F. Lineshaft Bearings: The bearings shall be designed for vertical pump service to be lubricated by the liquid being pumped. They shall be mounted in bearing retainers which shall be held in position in the column by means of the flanges. The bearings shall be spaced at intervals of not more than 5 feet. Lineshaft bearing shall be constructed of carbonite.
G. Discharge Column Pipe: Column pipe shall be flanged and size such that the friction loss will not exceed 5 feet per 100 feet based on rated pump capacity. The minimum wall thickness of the discharge column pipe shall be 0.375 inches. The pipe shall be furnished in interchangeable sections having a maximum length of 5 feet. All bolting and hardware shall be stainless steel.
H. Strainer: A stainless steel strainer shall be provided for the Raw Water pumps having a net inlet area equal to at least four times the suction pipe area. The maximum opening size shall not be more than 75 percent of the minimum opening of the water passage through the bowl or impeller.
I. Pump Schedule:
Pump
Station
Pump Type
Number
Required
Capacity
GPM
TDH Feet
Min. Eff.
Max Speed R.P.M.
H.P.
Discharge Size (In.)
Stages
High
Service
Vertical Turbine (can type)
2
2,100
300
80%
1,800
200
10
3
Low
Service
Vertical
Turbine
2
2,100
61
80%
1,200
50
10
2
2.3 MOTORS
A. The motor for driving the pump shall be of the variable frequency drive (VFD) starting vertical shaft, squirrel cage induction type and shall comply with applicable ASA specifications. Motor shall be furnished with an enclosure conforming to NEMA standards for Weather Protected Type I. The connection to the pump shaft shall be through a non-reverse ratchet type coupling or self-release coupling in the motor. The motor shall be of the proper size to drive the pump continuously and be non-overloading over the entire operating range of the pump. Motors shall be fitted with bearing temperature monitors, winding thermisters and a lower steady bearing. The motors shall be premium efficiency in design with a minimum rating of 93%. The motor
shall be designated for 40 degrees C ambient conditions. The motor shall be 3 phase, 60 Hz, and of the voltage specified on the Drawings.
B. A thrust bearing of ample capacity to carry the weight of all rotating parts plus the hydraulic thrust shall be incorporated into the motor as an integral part of it. The bearing shall be of such size that the average life rating is no less than five (5) year's continuous operation. Thrust bearings shall conform to L10 life requirements.
C. The motor shall be manufactured by U.S. Electric Motors or General Electric.
2.4 MISCELLANEOUS
A. Nameplates and other data plates shall be stainless steel, suitably secured to the pump.
B. Parts Numbering: Parts shall be completely identified with a numerical system (no alphabetical letters) to facilitate parts inventory control. Each part shall be properly identified by a separate number, and those parts which are identical shall have the same number to effect minimum spare parts inventory.
C. Spare Parts: The Contractor shall furnish the following spare parts for each pump supplied:
1. One (1) set of bowl bearings.
2. One (1) set of mechanical seal replacement material.
3. One-year supply of all lubricants required for all pumps and their accessories.
PART 3 - EXECUTION
3.1 SHOP TESTS
A. The pumps shall be fully tested at the manufacturer=s works before shipment at their rated speed, capacity, and head, and at such other conditions of head and capacity to establish that each has met all guarantees on the characteristic curves submitted. Pump test shall be performed utilizing factory calibrated motors to guarantee pump efficiencies. Five certified copies of the results of these tests are to be sent to the Engineer. Also included with the test curves shall be a certified bill of material list depicting quality of construction. Such tests shall be accomplished at the manufacturer=s facility prior to shipment.
B. The pumping units will be accepted upon the basis of the certified copies of the shop test, subject to a four hour field test of each unit. This test will be for the purpose of determining if each pumping unit will operate under installed conditions within a reasonable degree of correlation with the shop tests.
C. The equipment supplier shall give at least two (2) week's notice to the Owner when the tests are to be accomplished so that the Owner may have a representative present at the said tests.
3.2 FIELD ACCEPTANCE TESTS
A. After installation of the pumping equipment, and after inspection, operation, testing and adjustment have been completed by the manufacturer's representative, each pump shall be given a running test in the presence of the Engineer during which it shall determine its ability to operate without vibration or overheating, and to deliver its rated capacity under the specified conditions.
B. During the drawdown and field tests, observations shall be made of head, capacity, and motor input. All defects or defective equipment revealed by or noted during the tests shall be corrected or replaced promptly at the expense of the Contractor, and if necessary, the tests shall be
repeated until results acceptable to the Engineer are obtained. The Contractor shall furnish all labor, piping, equipment, and materials necessary for conducting the tests.
C. All adjustments necessary to place the equipment in satisfactory working order shall be made at the time of the above tests.
D. If sufficient water is NOT available for the test, the Contractor shall provide water for testing, if so directed.
E. In the event that the Contractor is unable to demonstrate to the satisfaction of the Engineer that the units will satisfactorily perform the service required and that they will operate free from undue noise and vibration, the pumping units may be rejected. The Contractor shall then remove and replace the equipment at his own expense.
F. The field verification and/or drawdown tests shall include measuring or determining the following items:
1. Flow rate.
2. Total head on the pump.
3. Power input.
4. Static head on the pump.
G. On those pumps or set of pumps that have a flow meter in the discharge line, the flow meter may be used to determine the pump flow rate once its accuracy has been verified in the field.
H. All field measurements for pump rate shall be made within 2 gallons per minute. Readings on all instruments shall be made at 2 minute intervals for the length of the test. The readings shall be averaged to calculate the power draw of the motor, the actual flow pumped, and the static and total dynamic head on the pumps.
I. The Contractor shall be fully responsible for the proper operation of equipment during tests and instruction periods and shall neither have nor make any claim for damage which may occur to equipment prior to the time when the Owner formally takes over the operation thereof.
J. For all pumping units, the Contractor shall furnish the services of accredited representatives of the pump manufacturer who shall supervise the installation, adjustment, and field tests of each pumping unit and give instructions to the operating personnel. As one condition necessary to acceptance of any pumping unit, the Contractor shall submit a certificate from the manufacturer, stating that the installation of the pumping unit is satisfactory, that the unit is ready for
operation, and that the operating personnel have been suitably instructed in the operation, lubrication, and care of the unit.
3.3 PUMP GAUGES
A. Pump pressure gauges shall be provided for all pumps to be installed under this section. Gauges shall have 4-1/2-inch white face dial with black figures. Gauges shall be provided with threaded bottom connections, gauge cocks and arranged for pipe mounting. Provide shut-off valve and union on each pressure gauge stem. Gauges shall be Ashcroft, Marsh or approved equal.
3.4 INSTALLATION
A. All pump equipment shall be installed in accordance with the manufacturer's recommendations.
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