Tài liệu Handbook of Mechanical Engineering Calculations P13 doc
Tài liệu Handbook of Mechanical Engineering Calculations P13 doc
... percent of the averageannual demand but may range up to 200 percent of the average annual demand.Maximum daily demands of 150 percent of the average annual demand and max-imum hourly demands of ... effluentwastewater is to have a BOD5 of 20 mg/L. Both filters are to have a depth of 7feet (2.1 m) and a recirculation ratio of 2. Filter media will consist of rock. Sizeboth stages of the trickling filter ... ft3/Mgal (3.74 to 201.9 m3/L) of flow. Assumea value of 20 ft3/Mgal (149.5 m3/L). Therefore, the average quantity of grit ex-pected is:33 33Volume of grit (ft / d)ϭ(20 ft / Mgal)(4.0...
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Tài liệu Handbook of Mechanical Engineering Calculations P7 docx
... reserved.Any use is subject to the Terms of Use as given at the website.Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS 7.38PLANT AND FACILITIES ENGINEERING FIGURE 23 Negative lift (gravity ... this handbook. Once the required flow rate is determined, apply a suitable factor of safety. Thevalue of this factor of safety can vary from a low of 5 percent of the required flowto a high of ... pumpsare generally used. Mechanical seals are becoming more popular for all types of centrifugal pumpsin a variety of services. Although they are more costly than packing, the mechanical seal reduces...
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Tài liệu Handbook of Mechanical Engineering Calculations P8 doc
... surges result. Theamplitude of the pressure surge is a function of the rate of change in the velocity of the mass of fluid. This procedure shows how to compute the amplitude of thepressure surge with ... factor of 2 for traps installed between aboiler and the end of a steam main; traps at the end of a long steam main or ahead of pressure-regulating or shutoff valves usually have a safety factor of ... ftϩequivalentlength of fittings, ft. Using data from the Hydraulic Institute, Crocker andKing—Piping Handbook, earlier sections of this handbook, or Fig. 4, find theequivalent length of a 90Њ4-in...
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Tài liệu Handbook of Mechanical Engineering Calculations P11 doc
... website.Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS 11.2TABLE 1Heat-Exchanger Selection Guide*Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... heat HmBtu required to melt a solid is Hmϭ(weight of solid melted, lb)(heat of fusion of the solid, Btu /lb). Since the heat of fusion of lead is 10 Btu/ lb (23.2kJ/kg), Hmϭ(600)(10)ϭ6000 ... Terms of Use as given at the website.HEAT TRANSFER AND HEAT EXCHANGE11.30PLANT AND FACILITIES ENGINEERING TABLE 8Results of Trial Calculations 1stTrial2ndTrial3rdTrial4thTrialNumber of...
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Tài liệu Handbook of Mechanical Engineering Calculations P15 docx
... Heating Values of Commercial GasesTABLE 21Capacities of Gas Pipes [Losses of pressure are shown in inches of water per100 ft (millimeters per 30.4 m) of pipe, due to the flow of gas with a specific ... given at the website.Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS PLUMBING AND DRAINAGE FOR BUILDINGS AND OTHER STRUCTURES15.35TABLE 13Demand Weight of Fixtures in Fixture UnitsЊFIGURE ... size for each roofDecide whether the small roof area, i.e., the machinery room roof, will be drainedby separate leaders to the ground or to the main roof area. If the small roof areais drained...
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Tài liệu Handbook of Mechanical Engineering Calculations P16 doc
... type of fuel, oil, gas, coal, etc., can be usedfor the structure.This procedure is the work of Jerome F. Mueller, P.E. of Mueller Engineering Corp.HEAT RECOVERY USING A RUN-AROUNDSYSTEM OF ... McClure & Associates, and Affiliate Professor of Mechanical Engineering, Washington University, as reported in HPAC Magazine. SI values were added bythe handbook editor.Additional design pointers ... gallons per minute *Handbook of Air-Conditioning System Design, McGraw-Hill, New York, various dates.Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright...
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Tài liệu Handbook of Mechanical Engineering Calculations P17 doc
... loss of 8 Btu /(day⅐ft2) of floor area perЊF [W/(m2⅐K)]. Total building heat loss will increase with the increase in the ratio of collectorto floor area because of the larger areas of glazing. ... and the coefficients of heat transmission of collector, windows,doors, walls, and roofs must be known to calculate the conductive heat losses of aDownloaded from Digital Engineering Library ... for example, an averagerecovery of 40 percent of 1200 Btu/ft2(3785 W/ m2) of solar energy of slopingsurface would require approximately 100 ft2(9.3 m2) of collector for the 50,000-Btu...
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Tài liệu Handbook of Mechanical Engineering Calculations P21 docx
... exact selection of a spe-cific make of belt, consult the manufacturer’s tabulated or plotted engineering data.Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... percent of rated torque to protect the gears and other parts of the drive. Space limitations dictate an upper limit of 4 in (10.2 cm) and a lowerlimit of 2.5 in (6.35 cm) for the diameters of the ... 167.8ϭ37.6.Check the manufacturer’s engineering data for the ratios of available gearedspeed reducers. Thus, a study of one manufacturer’s data shows that a speed-reduction ratio of 38 is available by using...
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Tài liệu Handbook of Mechanical Engineering Calculations P24 docx
... MECHANICAL AND ELECTRICAL BRAKES 24.17This procedure is the work of Allen S. Hall, Jr., Professor of Mechanical En-gineering, Purdue University; Alfred R. Holowenko, Professor of Mechanical Engineering, ... Doughtie, Professor of Mechanical Engineering, University of Texas.DESIGNING A BRAKE AND ITS ASSOCIATEDMECHANISMSDesign a hoist for the building industry to lift a cubic yard (0.76 m3) of concreteat ... the Terms of Use as given at the website. MECHANICAL AND ELECTRICAL BRAKES24.16 DESIGN ENGINEERING (3.8 cm). For a coefficient of friction of 0.3 and a maximum permissible pressure of 150 lb/in2(1033.5...
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Tài liệu Handbook of Mechanical Engineering Calculations P26 doc
... (cost of insert) / [(number of regrinds per insert)(number of edges per grind)]ϩ (cost of holder or head)/[(number of in life of holder or head)(number of regrinds perinsert)(number of edges ... depth of cut of 0.005 in (0.1 mm) per pass if the material cut is mediumsteel? How many passes of the tool are required?Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... m3).3. Compute the weight of electrode requiredThe Welding Handbook tabulates the weight of electrode for various types of welds—square grooves, 90Њ grooves, etc., per foot of weld. Then the electrodeweight...
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