SECTION PUMPS GENERAL PUMPS PART RELATED DOCUMENTS

Transcription

1 SECTION PUMPS PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Basic Requirements: Provisions of Section 15010, BASIC MECHANICAL REQUIREMENTS and Section 15030, ELECTRICAL REQUIREMENTS FOR MECHANICAL EQUIPMENT, are a part of this Section SUMMARY A. General: Provide all circulating water pumps as indicated ADDITIONAL REQUIREMENTS A. Related Sections: Related work in other Sections of Division 15 that relates to the work required by this Section shall include but not be limited to the following sections: PUMPS , BASIC MATERIALS AND METHODS , PIPE AND FITTINGS , VALVES , PIPING SPECIALTIES , VIBRATION ISOLATION , THERMAL INSULATION , PLUMBING PIPING SYSTEM , PLUMBING EQUIPMENT , HYDRONIC PIPING SYSTEM , PERFORMANCE VERIFICATION B. Related Divisions: Related work in other Divisions of these specifications that references work required by this Section shall include but not be limited to the following sections: 1.04 SUBMITTAL 1. Division 16, ELECTRICAL A. General: Refer to paragraph entitled "SUBMITTAL" in Section Include the following data: 1. Manufacturers Literature: a. Dimensional outline drawing of each pump and motor including suction and discharge sizes and motor connection. b. Operating weight and support locations. c. Maximum design operating pressure and pump shut-off head.

2 d. Materials of construction of all pump components. e. Motor horsepower, voltage phase for each pump motor. 2. Performance Data: a. Pump curves and brake-horsepower requirements at specified conditions and impeller size, and for all impeller diameters available in the same pump casing. b. Certified pump curves and brake-horsepower requirements at specified condition for frame-mounted end suction pump listed. c. Certified pump curves and brake-horsepower requirements at specified condition for vertical in-line pump listed. d. Motor horsepower, service factor, enclosure and other data for each specific pump application. e. Where pumps operate in parallel, identify both single and parallel operating points. f. Provide operating curves for pumps that have variable speed drives, in 100 rpm increments between 600 and 1800 rpm. 3. Installation Instructions: a. Manufacturer's printed installation instructions for each pump including copies shipped with the equipment. 4. Maintenance Instructions: a. Manufacturer's printed maintenance instructions for pump seals and shaft couplings. b. Exploded parts list for each type pump. 5. Manufacturer's Checkout: a. For each pump installed. PUMPS

3 1.05 APPLICABLE STANDARDS A. General: All equipment, material, accessories, methods of construction and reinforcement, finish quality, workmanship and installation shall be in compliance with the paragraph entitled "Code Compliance" in Section PART 2 - PRODUCTS 2.01 MANUFACTURER A. General: Refer to paragraph entitled "MANUFACTURERS" in Section B. Similarity: All pumps of a similar type shall be of the same manufacturer unless indicated otherwise. C. High Efficiency Motors: Motors 1 horsepower and larger shall be highefficiency type. Refer to paragraph entitled "ELECTRIC MOTOR" in Section SELECTION AND CAPACITY A. General: Each scheduled pump has been selected near its point of maximum efficiency. Pumps proposed which are other than those used as a design basis must be selected with the same considerations of efficiency, impeller diameter, brake-horsepower and other characteristics to be capable of providing the capacity intended. B. Pump and Motor: Pumps and motors shall be selected to be noncavitating and non-overloading regardless of pressures and flow rates which may be actually encountered in the system. Unless otherwise indicated, motors located inside the building shall be open-dripproof. Motors located outside the building or exposed to the weather shall be totally-enclosed fan-cooled. All pump motors shall comply with the paragraph entitled "ELECTRIC MOTOR" in Section C. Impeller Selection: Impellers shall be selected to operate efficiently at the scheduled points and shall be neither the largest nor the smallest impeller for the selected pump casing. D. Scheduled Horsepower: Motor horsepowers scheduled have been selected to be non-overloading at any point on the pump curve of the scheduled pump and this condition must hold true of any pump proposed. E. Variable Frequency Drive: Motors for pumps controlled by a variable frequency drive motor shall comply with the requirements of the paragraph entitled "VARIABLE FREQUENCY DRIVE" in Section PUMPS

4 2.03 BASIC PUMP CONSTRUCTION A. General: All pumps shall comply with the following requirements unless otherwise indicated. B. Casing: The casing shall be designed for 175 psi working pressure and shall be hydrostatically tested at 150 percent of the maximum working pressure. Suction and discharge flanges shall be provided and drilled to ANSI Standards. Provide cast lifting lugs in pump casing. C. Pump Volute: Plugged drain, vent, and gauge tappings shall be cast into the pump volute. The volute shall be designed such that the motor and pump can be disconnected and removed, leaving the volute and piping in place. D. Casing Rings: The pump case shall have two replaceable bronze case wear rings (impeller wear rings), located at each impeller skirt. Each ring shall be pinned or press-fit into grooved shoulders to lock the ring in place. E. Mechanical Seals: Mechanical seals shall be designed for operation in 225 degree F. liquid. Seals shall have a carbon seal ring and ceramic seat, or Ni resist seal, installed on both sides of the shaft, and shall have provisions for venting and lubrication. The shaft shall be steel, with a replaceable bronze shaft sleeve or collar. All pumps shall be provided with mechanical seals unless specifically indicated otherwise. F. Bearings: Radial and thrust bearings shall be single row ball, re-grease lubricated, self-aligning type mounted in cast iron cartridges with 100,000 hours average life. Bearings shall be removable without disconnecting the pump volute. Provide grease seals and neoprene water slingers to protect the bearings. G. Base: Provide a cast iron or steel drip rim base for each pump unit. Pump and drive unit shall be aligned and bolted or welded in place on a common baseplate prior to factory shipment. H. Gasket: Provide cellulose fiber gaskets for the suction and discharge flanges VERTICAL IN-LINE PUMP A. Certified Pump Curve: A certified pump curve for each vertical in-line pump is required. B. General: Pump shall be single-stage centrifugal vertical in-line type with axially-split cast iron casing. A drip base is not required. PUMPS

5 C. Impeller: The impeller shall be single suction type, made of cast bronze, balanced hydraulically and dynamically, keyed to the shaft and securely retained in an axial position by positive mechanical means. D. Manufacturer: 1. Aurora 2. Bell & Gossett/ITT 3. Armstrong 4. Paco 5. Peerless 2.05 IN-LINE CIRCULATOR A. General: In-line circulators shall be horizontal single-stage centrifugal type, unless otherwise indicated. Circulators shall be fractional horsepower, single-phase, 115 volt, 60 Hz input power. B. Volute/Casing: The pump casing shall be cast bronze, designed for operation to 125 psig, The volute shall be designed such that the motor and pump can be disconnected and removed, leaving the volute and piping in place. C. Impeller: The pump impeller shall be single-suction type, cast brass, dynamically balanced and secured to the shaft. D. Mechanical Seal: The mechanical seal shall be designed for operation to 225 degrees F. Seal shall have a carbon seal ring and ceramic seat. The shaft shall be steel with a bronze or brass sleeve, and shall have an integral thrust collar. E. Bearings: Bearings shall be bronze sleeve, oil lubricated type with a lubrication groove to distribute oil over the bearing surface. F. Coupling: Flexible multiple spring-type coupling shall connect the motor and pump, to dampen vibration and compensate for misalignment and torque stresses. G. Gaskets: Provide neoprene or EPDM gaskets for the suction and discharge flanges. H. Manufacturer: 1. Bell & Gossett 2. Armstrong 3. Taco PUMPS

6 PART 3 - EXECUTION 3.01 GENERAL A. Installation: Install pumps where indicated, in accordance with manufacturer's published installation instructions, with recommended clearances provided for service and maintenance. Complete servicing of the pump shall be possible without breaking piping or motor connections, except for close-coupled pumps. B. Piping Connections: Unless otherwise indicated, pump assemblies shall include suction and discharge isolation valves, discharge check valve, discharge flow controller, suction strainer with ball valve blowdown, and long-radius suction elbow with eccentric reducer mounted with the flat side of the reducer on top. A manufactured suction diffuser/strainer elbow may be substituted for the elbow, strainer and reducer; refer to paragraph entitled "PUMP SUCTION DIFFUSER/STRAINER ELBOW" in Section A triple-duty valve may be substituted for the discharge isolation, check and flow control valve; refer to paragraph entitled "PUMP DISCHARGE/FLOW CONTROL VALVE" in Section C. Pressure Gauges: Pressure gauges where indicated shall be provided with gauge cocks and shall be equipped with a pulsation snubber or be glycerin filled. The gauges shall be located as close to the pump impeller as possible on each suction and discharge. The suction side gauge shall be compound type. D. Expansion Joint Connectors: Refer to Section 15240, VIBRATION ISOLATION. Provide Type PVE-2 or PVE-4 expansion joint connectors on the suction and discharge of each pump. E. Factory Assembly: All openings such as the suction and discharge flanges shall be covered with wood or metal blanks, and the entire pump unit shall be assembled and sealed in plastic for shipment. Pumps shall be thoroughly cleaned and painted with one coat of machinery enamel and the pump and motor combination shall be factory-tested prior to shipment. F. Start-up: Verify proper rotation and check for excessive noise or vibration. If vibration exists, the pump and motor shall be realigned by a qualified millwright. Verify pump operation, test and log all operating parameters as detailed in Section 15990, PERFORMANCE VERIFICATION. PUMPS

7 3.02 PUMP SUPPORT A. General: Unless indicated otherwise pumps located on suspended slab above grade shall be supported on inertia bases. Pumps located on a slab on grade in the interior of the building shall be supported on an isolated concrete bases. Pumps located on the ground on the exterior of the building shall be supported on housekeeping pads. Pumps shall be anchored to the bases using leveling bolts and grouted with non-shrink grout. Refer to paragraph entitled "HOUSEKEEPING PADS AND EQUIPMENT SUPPORTS" in Section MOTOR DRIVE A. Requirements: Motor-to-pump connection shall be a flexible coupling capable of absorbing rotational vibrations, and accepting misalignment, for all pumps except close-coupled. Motors shall be mounted on the pump base, coupled to the pump shaft and properly aligned and secured in place. Coupling guards shall be installed and correct pump rotation confirmed. B. Lubrication: All motors and pumps shall be provided with lubrication as recommended by the manufacturer for the temperature and fluid involved, so operation during start-up, testing and balancing does not damage the equipment IN-LINE CIRCULATORS A. General: In-line circulators shall be installed to allow complete removal from the piping system without dismantling or removing any pipe or valves. No additional motor support shall be allowed. The adjacent piping shall be erected and fitted so the pump can be removed without forcing or springing the piping MANUFACTURER'S CHECKOUT A. Certification: Provide a representative from the pump manufacturer to verify and adjust pump alignment and all operating parameters. A checklist shall be completed, signed by the manufacturer, and six copies for each pump forwarded to the Architect prior to the substantial completion inspection. END OF SECTION PUMPS