Shock loss calculations across junctions and splits

by John C Edwards

Publisher: Dept. of the Interior, Bureau of Mines in [Washington]

Written in English
Published: Downloads: 177
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Subjects:

  • Mine ventilation,
  • Air ducts,
  • Shock (Mechanics)

Edition Notes

Bibliography: p. 9

Statementby John C. Edwards and Henry E. Perlee
SeriesReport of investigations - Bureau of Mines ; 8227
ContributionsPerlee, Henry E.
The Physical Object
Pagination[3], 9 p. :
ID Numbers
Open LibraryOL14914802M

Half Sine Shock Tests to Assure Machinery Survival in Explosive Environments By Howard A. Gaberson, Ph.D., Chairman MFPT Diagnostics and Signal Analysis Committee Corsicana Drive Oxnard, CA [email protected] ABSTRACT Previous work has shown that traditional four coordinate pseudo velocity shock spectrum is the best format forFile Size: KB. rate of potential drop across C will be based on the values of R & C. During the negative half cycle, diode D2 will initially be reverse biased due to voltage across C. When the voltage at the input crosses the dropping voltage across C, D2 will be forward biased. Now the load is supplied current by the input while simultaneously charging C. ThisFile Size: KB. The Bernoulli equation cannot be used across hydraulic jumps since energy is dissipated. Usually for sluice gates Z 1 >>Z 2, so the Bernoulli equation can be simplified to Q = Z 2 W (2 g Z 1) 1/2 (Munson et al., ) - which is the equation used in our calculation. Circular hole in tank (or pipe connected to tank). described below, which is given in a book by Peters,Timmerhaus, and West (1). This book also provides much valuable information on the design of such heat exchangers, including more sophisticated methods of estimating the pressure drop. The pressure drop on the shell-side is calculated using. 2 () 2 1 ss B shell e s fG D N P D µ ρ µFile Size: 23KB.

This book is a strange mixture of two different books. One is excellent, a revision of life in a small railway junction lost in the heart of the Sarozek desert in Kazakhstan, full with local legend and descriptions of the hard times they had to live in the years after the second world war, under the control of /5. The flow in manifolds is extensively encountered in many industrial processes when it is necessary to distribute a large fluid stream into several parallel streams and then to collect them into one discharge stream, such as fuel cells, plate heat exchanger, radial flow reactor, and irrigation. Manifolds can usually be categorized into one of the following types: dividing, combining, Z-type and. IGBT & SiC Gate Driver Fundamentals 10 3Q I Texas Instruments Basic gate driver features How is the drive strength determined for a power switch? The drive strength refers to the gate driver’s current source and sink capability. Choosing the drive strength depends on the power switch used (IGBT or MOSFET), based on its gate charge. The gate. Understanding the Basics of Delta Transformer Calculations Transformer configuration names like and derive from the way the windings are connected inside the transformer. These connections determine the way the transformer will behave, and they also determine the methods of calculation required for properly applying a given transformer.

  INTRODUCTION. The elderly population is rapidly growing, and traumatic injury of geriatric individuals is a significant problem for the health care systems of most advanced countries ().Elderly patients experience traumatic injuries as drivers or passengers in motor vehicles, as pedestrians being struck by motor vehicles, by falling from a height, and from crushing (2,3,4).Cited by: 9.   Policyholder surplus is assets of a mutual insurance company minus liabilities and it represents one indicator of an insurance company’s financial : Julia Kagan.   Ground neutral and hot wires explained. In this video we look at the difference and purpose of the ground wire, the hot wire and the neutral wire in a . E Page 1 Things worth knowing about hydraulic cylinders Subject to change without prior notice Things Worth Knowing about Hydraulic Cylinders This chapter is intended to provide support for the design and choice of hydraulic cylinders. It contains technical explanations and data, calculation formulae, practical information and.

Shock loss calculations across junctions and splits by John C Edwards Download PDF EPUB FB2

Additional Physical Format: Print version: Edwards, John C. Shock loss calculations across junctions and splits. [Washington]: Dept. of the Interior, Bureau of Mines, Get this from a library.

Shock loss calculations across junctions and splits. [John C Edwards; Perlee, Henry E.,]. and shock losses incurred as the air enters and passes through the cone must be assessed separately.

At location (ii) the fan and inlet cone are considered as a unit and only the shock loss at entry requires additional treatment. However, if location (iii) is selected then the fan, inlet cone and inlet shock losses are all taken into account.

can occur in a cross: 1) flow into one leg and out of three legs (dividing flow), 2) flow. into three legs and out of one leg (combining flow), 3) flow into two perpendicular legs.

and out of two perpendicular legs (perpendicular flow), and 4) flow into two opposite. legs and out of two opposite legs (colliding flow). Pipe Fitting Losses Pressure loss in a pipe due to fittings such as elbows, tees, valves, expanders and reducers based on 3K and 2K method.

For diverging flow, the pressure loss coefficient decreased as the flow rate increased. Therefore, the angle of the junction may have a significant influence on the loss coefficient.

Most importantly, the results show again that the roughness played a very important role in predicting the pressure loss coefficients. This scalar quantity ∆ls is called as hydraulic loss. The hydraulic loss between two different cross The hydraulic loss between two different cross section along the pipe is equal to the difference of total energy for this cross section:File Size: KB.

into a junction in a ductwork system is equal to the amount of air mass leaving the junction, or the sum of air masses at each junction is equal to zero. In most cases the air in a duct is assumed to be incompressible, an assumption that overlooks the change of air density that occurs as a result of pressure loss and flow in the ductwork.

Summarize the Pressure Loss in each Section. Calculate and summarize the pressure loss in each section. Summarize the Pressure Loss in all Paths. Finally, add up the pressure loss in all sections that form unique paths. In the example above there are two unique paths - one is section 0 - 2 - 3, the other is section 0 - 2 - 4.

Establish one flow rate in the minor losses line and record pressure levels across each device. Note that a length of pipe between tapping points also contributes to the observed pressure loss. The image above is of the friction loss experimental rig showing the different.

Example: Determine L (friction loss in pipe fittings in terms of equivalent length in feet of straight pipe). Assume a 6" angle valve for Schedule 40 pipe size. Select the appropriate K value for such and select D and f for Schedule 40 pipe from the table below where K is the pipe diameter in feet.

Pipe Size Inches Sch. 40 D feet f Pipe Size InchesFile Size: KB. At equilibrium conditions, the heat loss or gain from the attic or basement, as indicated in Figure 2, is equal to the heat loss or gain to the building through the ceiling or Size: 2MB.

This friction loss calculator employs the Hazen-Williams equation to calculate the pressure or friction loss in pipes. Losses are calculated on the basis of flow rates in circular pipes, the internal diameter of the pipe, the length of the pipe, and the type of pipe.

PIPE FITTING FRICTION CALCULATION The friction loss for fittings depends on a K factor which can be found in many sources such as the Cameron Hydraulic data book or the Hydraulic Institute Engineering data book, the charts which I reproduce here in Figures 1 and Size: 2MB.

local head loss at each of which is v2/2g, and three bends at each of which the head loss is v 2/2g where V is the velocity of water in the pipe.

Calculate the value of K in the expression h = K Q 2 relating the total head loss h to the flow Q through the pipeline. SOLUTION part (a) Note = 4C f Straight pipe 2g v 2g() ()(20 0. loss for a known discharge. Thus, hf = 32 f L Q 2 2 g d 5 Note: In American practice and references, λ = f American = 4 f Example 1: A pipe 1 m diameter and 15 km long transmits water of velocity of 1 m/sec.

The friction coefficient of pipe is Calculate the head loss due to friction. Solution hf = 4 f L v 2 2 g dFile Size: 1MB. To calculate the pressure loss in a pipe it is necessary to compute a pressure drop, usually in fluid head, for each of the items that cause a change in pressure.

However to calculate the friction loss in a pipe for example, it is necessary to calculate the friction factor to use in the Darcy-Weisbach equation which determines the overall friction loss.

Energy Loss and Length y1 y2 Lj yj Energy Loss: Exercise: convince yourself that this is the same as E = E1 –E2. Lj yj Jump Length: Lj = yj = (y2 –y1) Rectangular Channel Example # Normal depth downstream in a trapezoidal channel is m when the discharge is 15 m3/s.

What is the upstream sequent depth. Answer: m. as: development of interest rate shock scenarios, consideration of behavioural and modelling assumptions, credit spread risk measurement, IRRBB Risk Appetite setting for both economic value and earnings, IRRBB inclusion in the ICAAP by taking account of changes in the economic value of equity and in net interest income.

A computer code for laminar, steady-state, incompressible, two- dimensional flow, developed by gosman was modified by the Bureau of Mines to calculate shock (minor) loss at the intersections of ventilation ducts.

Turbulent flow was simulated using laminar flow equations and an appropriate wall shear stress. Friction loss calculator Quickly solve friction loss for any length, GPM & hose sizes. Ex: ft 1 3/4" hose with gpm & ft 2 1/2" hose with gpm; Friction loss tables List of printable friction loss tables for all common hose sizes Ex: 1 3/4" Friction Loss Table & 2 1/2" Friction Loss Table; Friction loss cheat sheet Compact.

Because Bernoulli’s equation relates pressure, fluid speed, and height, you can use this important physics equation to find the difference in fluid pressure between two points. All you need to know is the fluid’s speed and height at those two points.

Bernoulli’s equation relates a moving fluid’s pressure, density, speed, and height from Point 1 [ ]. The impetus for the preparation of a second edition of the Guide to Design Criteria for Bolted and Riveted Joints has been the enthusiastic reception of the original version and the continued citation for over a decade of that book as a source of information regarding the design of bolted connections.

There certainly has been no other single. Pipe Friction Loss Calculations Flow of fluid through a pipe is resisted by viscous shear stresses within the fluid and the turbulence that occurs along the internal pipe wall, which is dependent on the roughness of the pipe material.

Pitot tubes can be used to measure fluid flow velocity by measuring static and dynamic pressure difference. A pitot tube can be used to measure fluid flow velocity by converting the kinetic energy in a fluid flow to potential energy.

The principle is based on the Bernoulli Equation where each term of the equation can be interpreted as pressure. conditions and risk management practices across jurisdictions. Moreover, the required calculation of a standardised framework, embedded in a Pillar 2 approach, represents a new hybrid intersectionbetween a capital requirement (Pillar 1) and a supervisory review process (Pillar 2)and would have served to.

Units in water hammer calculation: cm=centimeter, ft=foot, g=gram, gal=gallon (U.S.), GPa=GigaPascal, in=inch, The "steady Q at Y=%" field that you enter is used to compute the initial loss across the valve if the valve is initially open (i.e.

if the valve is being closed) and to compute the friction factor (f) for both the valve opening. Choked flow is a compressible flow effect. The parameter that becomes "choked" or "limited" is the fluid velocity.

Choked flow is a fluid dynamic condition associated with the venturi a flowing fluid at a given pressure and temperature passes through a constriction (such as the throat of a convergent-divergent nozzle or a valve in a pipe) into a lower pressure environment the fluid C d {\displaystyle C_{d}}: discharge coefficient.

The coordination split for a phase i, expressed in seconds, is calculated by the sum of the green, yellow and red times, gi + yi + ri.

A split for phase i, expressed as a percentage, is calculated as (gi + yi +ri)/C. This gi value is independent of the maximum green time for phase i and the walk and flashing don’t walk (if applicable). Heat transfer equipment may be designated by type or function it performs, such as chiller, condenser, cooler reboiler, etc.

The choice of shell and tube type is determined chiefly by factors such as the need for the provision for differential movement between shell and tubes, the design pressure, the design temperature, and the fouling nature of the fluids rather than the function.

junctions to ‘get right’ or improve are those which either have a high PSI-value or occur frequently over significant lengths. Although the particular junctions of interest will vary depending on dwelling type and design, this Guide covers the key junctions considered by the authors to be the most significant across a range of dwelling types.Burn Shock.

Burn shock is a combination of hypovolemic and cellular shock and is characterized by changes that include decreases in cardiac output and plasma volume resulting in decreased blood flow to major organs.

delivery below 30 kcal/kg has been associated with significant weight loss and lower pre-albumin levels. 68 Daily calculation.The form of circulatory shock known as hypovolemic shock is _____.

shock that results from large-scale loss of blood volume, or after severe vomiting or diarrhea Arteries always carry .