Load Calculations and Specialized Designs
2009-09-22 20:09:00 Hi All, I need Mechanical Engineers who can support me with the load calculations and Design and Detailing of specialized Solutions, like lifting of glass floor, designing hydraulic scissors plat form to lift floor of a swimming pool, designing hydraulic scissors plat form for Elevator lift goin
Flange Mass Calculations
2009-09-21 11:38:00 how do i calcuate mass for 50mm thk , 3500m diameter flange
Dropping a Ball (Force Calculations)
2009-09-16 19:35:00 Hello Ladies and Gentlemen, Can anyone tell me what is the force of a ball with a weight of (2.2lb) dropped from 2 meters height? Can any tell me the formula what would F? be at point of impact. Under normal conditions. Thanks, Richard
Hydraulic Pump Calculations
2009-09-15 23:51:00 I am currently studying for my hnc in mechanical engineering and the notes we have been given out are not very helpful, half the formulas have been cut off by the photocopier. Help would be much a appreciated. Thanks. Question 1: A hydraulic pump delivers 0.03m3/min to a motor whic
Scissor Lift Design Calculations
2009-09-15 20:35:00 Hello, I am designing a single hydraulic scissor lift and require information in order to verify my calculations can anyone guide me in the right direction or assist me in verify my calculations, below are my information. -calculate the stress and deflection on the scissor arms
UPS Power Backup calculations?
2009-09-15 07:22:00 No. of Batteries: 10; Each Battery Capacity: 20V, 12 amp hr; 230Volts supply. How can i calculate how much time it takes to discharge completely at o/p load of 10%.
Electrical Load Calculations
2009-09-08 18:12:00 can anybody tell me about electrical load calculation and what are the parameter required, and any freely available software.
EARTHING SYSTEM CALCULATIONS FOR LT SYSTEM
2009-08-27 01:49:00 CAN YOU SUGGEST FORMULA AND METHOD OF CALCULATION NUMBERS OF EARTH PITS AND RUNNING EARTH STRIPS THAT WILL BE REQUIRED TO EFFECTIVELY EARTH A PUMPING STATION HOUSING MOTORS, LIGHTING, DG SET ETC.
Earthing Resistance Calculations
2009-08-14 06:52:00 Hi All, I have few doubts about earth tests. Our refinery has about 10 substations for each area and the earth grid is one for the whole refinery. We do Low Current Injection testing for the whole site every 5 years But what sort of Preventative maintenance strategies do we implement annualy j
SEER Calculations
2009-08-11 04:11:00 SEER 8 evap unit with SEER 13 condensor unit/ What is the formula for calc. the overall SEER (which seems to be around 8)?
Capacitance calculations
2009-08-04 07:02:00 Hi All! I want to know how can we calculate capacitance from KVAR (Reactive power)? I have a faulty 25KVAR, 415VAC, 50HZ capacitor. It has nine capacitor cells connected in delta connection. These cells have no specifications on their casing. I want to replace its damaged capacitor cells.
Reinforcement Calculations - ASME 31.3
2009-07-27 20:56:00 While calculating the reinforment requirements..as per the ASME 31.3, while calculating the A4 we need to take into consideration the differnet types of welds..which is a little confusing... can anybody help me out for calculating the different cases of A4.. calculating area of tri
Earthing Resistance Calculations
2009-07-26 13:06:00 how to calculate earthing resistance of electrical installations,& how to decide earthing system / earthpit design for electrical installations like power trafo body earthing,neutral earthing?
Calculations for Scissor Lift
2009-07-25 19:18:00 How to calculate stresses in scissor arms? Are they simply 2 beams or? What should I pay attention to? How to calculate force applied to extract the scissor arms? I only found this http://www.engineersedge.com/me-chanics_machines/scissor-lift.h-tm but in my design arms can't be equal-lenghted.
Manufacturing Cost Calculations
2009-07-24 21:32:00 We are planning on rolling out a new product line. We have loads of data such as Raw material costs, time studies, wages, packaging and shipping costs, etc etc. Does anyone know of a standard formula or procedure to use when calculating the cost that a product should / could be sold for? Not being s
Distribution Point-of-Use Flow Calculations
2009-07-14 18:06:00 Hello, I have a 140F water distribution loop that spans my plant with a discharge pump and buffer tank. The distribution line is 1.37" id and has a discharge pressure of 100 psi at the pump outlet as well as a static (no consumption) return pressure of 25 which is regulated with a back-
Import Calculations from old versions of Excel without a Problem
2009-07-14 09:24:00 While upgrading to Excel 2007, you imported calculations from older Excel documents. However, the import wasn?t 100 percent successful and you get the error message ?#NAME?? in some cells. The problem occurs if you have used analysis functions such as ?CONVERT?, ?CALENDAR WEEK? or ?MROUND? in the calculation, which you had to activate earlier as ... Related posts:How to Convert Numbers To Text in MS-Excel [ Change Format ]Prevent Gross Computing Errors in MS-Excel using Hot Fix PackageHow to Count Blank And Non-Blank Cells in MS-ExcelHow to Display Negative Time Values in MS-ExcelHow to Open An HTML Page In MS-ExcelCheck / Test Working Condition of Installed Firefox Plug-ins or Add-Ons
Area Calculations: CR4 Challenge (07/14/09)
2009-07-13 00:01:00 This week's Challenge Question: You divide your lawn by a grid of 3-feet squares. Now take five stakes and put them at any five corners of your grid. Now take a long string and run it around the five stakes. What is the area of the lawn inside the string? Can you find a general equation to calc
gas strut calculations
2009-07-01 10:50:00 Can any help me with the formula to work out how much force is required to lift a steel shutter. It is pivoted at the top by means of a solid bar on a bearing and needs to be pushed by hand at the bottom by a person. because of the weight gas struts are required to help with the weight and also st
Reinforced Concrete Slabs - Cracking and Deflection Calculations
2009-06-29 18:01:00 I would like to share an engineering article about calculations that was prepared by the Structoris structural design team in order to assess the cracking and deflections of a slab. The deflection calculations took into account non-linear characteristics, creep effect and the decreased rigidity due
Water Pressure Calculations
2009-06-24 22:33:00 Hi there, I am new to this site and will try asking the question again. OK, Stand a 4inch pipe up that is 50 ft tall. Fill it with water. at sea level what is the pressure/ force. PSI at the bottom.
Doublet Flow Calculations
2009-06-22 18:25:00 The stream function for a plane potential incompressible doublet flow is supposed to be psi = -(Q/2pi)*arctan((2arsin(theta)/-(r^2-a^2)) Why? Q = superficial flow rate (volume flow rate/unit length) r, theta = polar coords 2a = length of the doublet.
Solar Energy Calculations
2009-06-07 19:16:00 can some help to know the answer to my following quistion: how much ELECTRICAL power i can produce through solar cells where solar radiation in our area is up to 900 watts/m2 in middle of the day in summer?what will the cost of hardware..etc(investment cost per m2).
Venturi Injectors and Suction Calculations
2009-06-05 14:47:00 Dear Sir, we are going to use a venturi injector to inject ozone gas into water.How to calculate the suction of the venturi say for example the pipe diameter of upstream venturi is 7.4cm,Diameter of ventury neck is 3.05cm,fluid density is 1kg/m3. Senthil
Pipe Bending Calculations
2009-05-22 08:31:00 How to calculate the elongation during pipe bend Pipe details SCH 80
calculations of seat back strength (car seat)
2009-05-22 08:09:00 how to calculate car's seat back strength? if someone has any simple calculations please post it on this site!. sarath.
Load Calculations for Bellows
2009-05-19 11:43:00 will u tell me how we can calculate the bellow according to the load or how we can identify perticuler bellow bear how much load if is there any formula make does't matters for the bellow
Bleeder Blind Calculations
2009-05-08 16:43:00 How do you calculate the minimum thickness required for a non-standard bleeder blind? Thanks all in advance.
Unbalanced 3-Phase Power Calculations
2009-05-06 20:45:00 Hello, I am working on an energy audit for a commercial building. We have put a power meter on some circuits to try and determine the power usage of various pieces of equipment with random hours of operation. Now I have some data such as the following and I'm wondering what the best wa
Tranformer Voltage Drop Calculations
2009-05-04 23:45:00 dear CR4 , my name is sansay samuel,iam electrical engineer and at present iam working in design and controls i need your help, i want to know how to calculate the voltage drop across the transformer , i want the steps and formulaes to calculate the heat dissipation and to select proper siz
Power loss calculations
2009-05-02 00:35:00 here in Thailand when the developer builds a project, he has a transformer and meter installed by the Power Company. He than must install an MDB and metering to individual plots, houses ect. In most cases he reads the individual meters and bills at the rate on the main meter bill. Now in th
Wind Load Calculations and Deflection
2009-04-15 16:23:00 Greetings, I hope you will be able to help me. I am a sales rep for a Solar company. We pre-assemble 3 panels and frame them, wire them, attach a microinverter, ready to go. We have sold a couple of jobs in the Miami Dade area, a 146 mph wind zone. I have submitted our module to a testing c
Space Vector PWM Calculations
2009-04-15 13:14:00 how do i find find vref and alpha in space vector pulse width modulation (pwm) calculation? I have calculated vd, vq, vref, alpha, T1,T2,T0, using the formula. But i feel the way i proceeded is wrong because some of my time values have come negative. My main doubt is to find vd and vq...Can any one
telescope lens calculations for refactor telescopes
2009-03-31 17:22:00 hi there I am looking at building myself a refactor telescope and am trying to find out how to calculate the magnification and the distances of the lenses from one another I have seen some sites where they show making the telescopes but no simple explanations on how to calculate the lenses etc.
Telescope Lens Calculations for Refractor Telescopes
2009-03-31 17:22:00 hi there I am looking at building myself a refactor telescope and am trying to find out how to calculate the magnification and the distances of the lenses from one another I have seen some sites where they show making the telescopes but no simple explanations on how to calculate the lenses etc.
muzzle velocity calculations
2009-03-28 02:31:00 Can anyone help me calculate an approximate muzzle velocity? I have a barrel ID of 3" Length of 6' projectile weight of 4.5 lbs An initial pressure of 1000 psi and a calculated discharge pressure of 840 psi. The bore is smooth ( DOM Hydraulic tubing ) What formulas can I use varying psi & projec
Heat Calculations for Electroplating
2009-03-25 07:42:00 hallo, We have a electroplating shop. pressently heating of chemical is being done by steam. I want to replace steam bath heating with electrical heating . how can I calculate saving through replacement and what calculation is required for this . please help me.
MCCB Calculations
2009-03-20 02:38:00 Dear All Guru I hv 1000Kva (6600/433v 3Phase 50Hz) transformer and feed to main switch board with 1600 A ACB and 20 number of varies size MCCB. - from 30A to 600A Please advise me how to calculate the KA (Breaking current) for my HT breaker,LT breaker,bus bar size,out going cable f
MATLAB and Amplitude Calculations
2009-03-06 01:05:00 hi; i have around 34,000 readings of wave surface elevations at every 0.5 second. using a pressure transducer under the water, the height variation of the water surface was taken.when i plot these data; y axis= height above sealevel, x axis=time, i get a sinusoidal wave graph. now i need to c
Voltage drop calculations
2009-03-04 07:46:00 Dear all I want to know the voltage drop calculation for the below values. Current (I) in the circuit is 1000A Voltage is 415V Length is 800m What is the cable size for the above circuit. Please send me the calculation part for the above values Thank you,
Short circuit calculations
2009-02-28 08:42:00 Dear all I want to know the short circuit calculations for circui breaker and transformer Please give the answer theoritically and mathematically Madhu
calculations and equations for a savonius wind turbine
2009-02-15 20:42:00 Does anyone know the calculations or equations to find the torque output for a two-stepped savonius wind turbine?
compressor calculations
2009-02-15 06:01:00 Hi. I had 2 questions about Rotrary screw compressors yesterday. Why dont you answer my questions? I would be appreciated you to help me. Best regards; Jack-C.R.C
Lag Time Calculations
2009-02-13 19:18:00 Hi There, I am anew member in CR4. I would appreciate if someone could give an answer for my question on how to calculate lag time for gas or liquid in analyzer system. Thanks Siva
Short Circuit Calculations
2009-02-10 11:05:00 r/s, i have some problem releted to short ckt calculation 1) why we use three phase fault for calculation compare to others like- LG, LL,LLG. 2)WHY WE ARE NOT CONSIDER LOW VOLTAGE SYSTEM IN SHORT CKT CALCULATION. GIVE MORE DETAIL FOR SHORT CKT
Calibration Calculations
2009-02-05 15:38:00 my question one of close tank, tank hight 8840mm cap fluid S.G 1.07 process fluid S.G 1 so how to calculate,what is the formula for calibration |
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