how to generate barcode in asp net c# Testing HVAC Centrifugal Pumps 556 Installing and Operating HVAC Pumps in Software

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Testing HVAC Centrifugal Pumps 556 Installing and Operating HVAC Pumps
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248 Summation To ensure the quality of HVAC pumps, the designer of HVAC water systems should specify that all pumps be tested in accordance with the standards of the Hydraulic Institute Small pumps should meet at least level B performance, while large pumps should be factory tested and certified to level A performance Pumps can be certified by the manufacturer of pumping systems, where the entire pumping system is tested for flow, head, power and efficiency A wire-to-water efficiency test should be conducted on the entire pumping system This is described in Chap 26 The ANSI/HI test standard is so complete for this testing and the interpretation of the results that there truly is a criterion now for complete evaluation of pumps or pumping systems for the HVAC industry 249 Bibliography
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ANSI/HI 11-15-2000, Centrifugal Pumps, Hydraulic Institute, Parsippany, NJ, 2000 ANSI/HI 91-95-2000, Pumps General Guidelines, Hydraulic Institute, Parsippany, NJ, 2000 ANSI/HI 16-2000, American National Standard for Centrifugal Pump Tests, Hydraulic Institute, Parsippany, NJ, 2000
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Source: HVAC Pump Handbook
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Installing HVAC Pumps and Pumping Systems
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251 Introduction A pump s useful life is determined more by its installation than by its quality of manufacture More pumps wear out because of improper installation and operation than from any other factors As has been mentioned often in this book, HVAC pump duty is easy pump duty compared with other industries or applications of pumps HVAC pumps should not have unusual maintenance The way to avoid maintenance is to install the pumps or pumping systems properly Almost all pump and pumping system manufacturers have detailed installation instructions that should be followed carefully The basic effort in installing this equipment is to conclude with an installation that imposes no external forces on the pumps or pumping systems This is achieved by setting the pump base properly and connecting the piping and electrical connections so that no forces are imposed on the finished assembly 252 Preinstallation Procedures Much agony and frustration would be eliminated if all pumps were checked carefully prior to installation On many HVAC installations, there can be dozens of pumps of different sizes Great care should be taken before setting any pumps on their foundations Following are specific details that should be checked: 1 Each pump should be tagged with its project number and particular service, such as pump no 1A, primary chilled water pump no 1
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Installing HVAC Pumps and Pumping Systems 558 Installing and Operating HVAC Pumps
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2 Each pump should be checked for model number, impeller diameter, and on double-suction pumps, the rotation of the impeller 3 The pumps should not be set in place until the equipment room is completed to the point where the pumps will not be damaged by construction equipment, debris, or freezing Some water may remain in the pump volutes from factory testing; drain plugs should be removed to prevent any freezing of water in the volutes 4 Pumps should be lifted from rigging points only, not from the pumps or motors themselves on base-mounted pumps On closecoupled pumps, the lifting points should be specified by the manufacturer 5 The electric motors should be checked for horsepower rating and specified voltage 6 On electric motor driven pumps, the power supply should be checked for correct voltage as well as the variation in voltage from leg to leg on polyphase applications A sizable variation in voltage in the three different phases can cause an appreciable reduction in power for an electric motor See Table 71 for the amount of derating caused by a voltage imbalance between phases 253 Pump and Pumping System Bases It is quite obvious that the beginning of a successful pumping installation is providing the correct base for the pumps and their accessories Much of the trouble with pumps results from improperly designed bases The base begins the attachment of the pump to its environment, and that base must be designed to fit the conditions surrounding the pump Pump bases can be solidly connected to the equipment room floor, or they can be floated on vibration-type bases Various types of pump and pumping system bases are shown in Fig 251 This is the first question that must be asked: Is a vibration-type base required to prevent any vibrations originating in the pump or its driver from reaching the floor If the pumping equipment is to be mounted on an upper floor with occupancy beneath it, very likely a vibration-type base will be required There are cases where the vibration base is required even though the pump base is mounted on concrete that is poured on rock at the first elevation in a building When the activity in the building is of a sensitive nature, such as experimental research, the vibration base prevents objectionable vibration and noise from being transmitted from the pumping system base through the building All bases should be designed to keep casual water away from any metal Solid concrete bases with the pump and its metal base mounted
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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