Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

problem 1: A pressurized water tank is used as a source of water for a fire hose. The pressure of the air in the top of the tank  is 20 atm (gauge). To be effective, the minimum exit velocity (Vexit) of  the water from the hose must be at least 20 m/s. The water supply pipe and hose consist of 10 metres of 50 mm inside-diameter pipe and hose. The average roughness height inside the pipe and hose is 0.05 mm. The system contains one 90° elbow and one flow control valve. The valve’s K vs Closure % calibration curve is given in figure below.

a) State any assumptions associated with this problem.

b) Determine the valve closure (in %) to achieve a water exit velocity of 20 m/s.

c) Determine the exit velocity when the valve is fully open.
 
The properties of water are: ρ = 1000 kg/m3 and µ = 1.00 x 10-3 N.s/m2.

2469_water tank and fire hose.jpg

Figure: (a) Water tank and fire hose and (b) the K-vs-Closure graph.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M91784

Have any Question? 


Related Questions in Mechanical Engineering

Which is greater the tensile strength of a bolt or its

Which is greater, the tensile strength of a bolt or its stripping strength? Why? Where in the bolt would we find the maximum tensile stress? Where in a conventional nut? Define proof strength ? Compute the conventional t ...

1 find the change in temperature between stations 1 and 2

1. Find the change in temperature between stations (1) and (2) in terms of the quantities A 1 , A 3 , v 1 , v 3 , c v , and θ. The internal energy is given by c v T. The fluid is water and T 1  =T 3 , P 1  = P 3 . 2. A l ...

A potential flow source having an intensity of 10m2s placed

A potential flow source having an intensity of 10m2/s, placed in the point of Cartesian coordinates (1;0), and a sink having identical intensity, placed in the point (-1;0), are combined with a uniform flow at 25 m/s, in ...

Calculate the fraction of n2 molecules in a sample at 298 k

Calculate the fraction of N2 molecules in a sample at 298 K that have speeds less than 10.0ms -1 by integrating the Maxwell-Boltzmann distribution over the appropriate range of speeds (just writing the correct integral i ...

What primary factors determine the number of load cycles

What primary factors determine the number of load cycles required to break a bolt subject to fatigue loading? Describe the appearance of the break surface of a bolt which has failed in fatigue ? Where on a bolt are you m ...

Bull why do individual bolts relax a bit when first

• Why do individual bolts relax a bit when first tightened? Name several factors that can increase the relaxation ? Which will tend to loose more preload after initial tightening, a short bolt or a long bolt? • What are ...

Experiment title heat engine experimentacademic in charge

Experiment title: Heat Engine Experiment Academic in charge of experiment: Experiment duration: The standard scheduled time for this experiment is 90 minutes for 3 groups (A, B, C) of 6 students. Each group undertakes ex ...

The stepped shaft rotates at 120 rpm and has a 20 kw input

The stepped shaft rotates at 120 rpm and has a 20 kW input at A. 16 kW is taken off to operate machinery at B, and the remaining 4 kW is used at C. The shaft is stainless steel with yield strength in shear of 300 MPa. a. ...

The concentric joint of problem is subjected to an increase

The concentric joint of problem is subjected to an increase in temperature of 1008F. Does this increase or decrease the tension in the bolts? By how much? (Assume that the coefficient of linear expansion of the bolts is ...

We want to tighten an astm a193 bolt having 4-8 un threads

We want to tighten an ASTM A193 bolt having 4-8 UN threads and a yield strength of 96 ksi. The effective length of its body, Lbe, is 12 in.; that of its threads, Lse, is 4 in. We're going to control the buildup of preloa ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro