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authortslee2014-11-27 17:17:59 +0530
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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:8c6f5ddedf44ae20de67fc03890769a1dfcd2f9b5b396e3c44b963afe6559e1b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 17 : Centrifugal and Axial-Flow Pumps"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 17.1 Page No : 543"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math \n",
+ "\t\n",
+ "#Initialization of variables\n",
+ "Ns = 500. #minimum practical specific speed\n",
+ "h = 900. \t#ft\n",
+ "Q = 1600. \t#gpm\n",
+ "\t\n",
+ "#calculations\n",
+ "ne = Ns*h**(3./4) /math.sqrt(Q)\n",
+ "\t\n",
+ "#Results\n",
+ "print \"Minimum rotative speed = %d rpm\"%(round(ne,-1))\n",
+ "\n",
+ "#Initialization of variables\n",
+ "ne = 600. \n",
+ "gpm = 1600.\n",
+ "Ns = 500.\n",
+ "Head = 900. \t#ft\n",
+ "\t\n",
+ "#calculations\n",
+ "h = (ne*math.sqrt(gpm) /Ns)**(4./3)\n",
+ "n = Head/h\n",
+ "\t\n",
+ "#Results\n",
+ "print \"No. of stages = \",round(n,3)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Minimum rotative speed = 2050 rpm\n",
+ "No. of stages = 5.159\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 17.2 Page No : 543"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math \n",
+ "\t\n",
+ "#Initialization of variables\n",
+ "ne = 600. \n",
+ "gpm = 2000.\n",
+ "h = 150.\n",
+ "num = 2.\n",
+ "\t\n",
+ "#calculations\n",
+ "ns = ne*math.sqrt(gpm) /h**(3./4)\n",
+ "gpm2 = num*gpm\n",
+ "h2 = num**2 *h\n",
+ "Ns = 2*ne*math.sqrt(gpm2) /h2**(3./4)\n",
+ "Ne2 = Ns*(h/2)**(3./4) /math.sqrt(gpm)\n",
+ "\t\n",
+ "#Results\n",
+ "print \"Specific speed in case1 = %d \"%(ns)\n",
+ "print \"Flow rate in case 2 = %d gpm\"%(gpm2)\n",
+ "print \" Head in case 2 = %d ft\"%(h2)\n",
+ "print \" Specific speed in case 2 = %d \"%(Ns)\n",
+ "print \" required operating speed in case 2 = %.f rpm\"%(Ne2)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Specific speed in case1 = 626 \n",
+ "Flow rate in case 2 = 4000 gpm\n",
+ " Head in case 2 = 600 ft\n",
+ " Specific speed in case 2 = 626 \n",
+ " required operating speed in case 2 = 357 rpm\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 17.3 Page No : 552"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math \n",
+ "\t\n",
+ "#Initialization of variables\n",
+ "ne = 600./2 \n",
+ "gpm = 1450.\n",
+ "h = 140.\n",
+ "NPSH = 10.4\n",
+ "\t\n",
+ "#calculations\n",
+ "Ns = gpm*math.sqrt(ne) /h**(3./4)\n",
+ "sigmac = NPSH/h\n",
+ "zsmax = -3 \t#ft\n",
+ "\t\n",
+ "#Results\n",
+ "print \"Sigma C for the pump = %.4f\"%(sigmac)\n",
+ "print \" Position of pump = %d ft\"%(zsmax)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Sigma C for the pump = 0.0743\n",
+ " Position of pump = -3 ft\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 17.4 Page No : 557"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math \n",
+ "\t\n",
+ "#Initialization of variables\n",
+ "ne = 600.\n",
+ "gpm = 84500.\n",
+ "h = 225.\n",
+ "f = 0.95\n",
+ "phie = 1.1\n",
+ "g = 32.2\n",
+ "\t\n",
+ "#calculations\n",
+ "Ns = ne*math.sqrt(gpm) /h**(3./4)\n",
+ "u2 = phie*math.sqrt(2*g*h)\n",
+ "D = 153.2*phie*math.sqrt(h) /ne\n",
+ "D0 = 1.06*D*12 \t#in\n",
+ "B = 0.155*D0*12 \t#in\n",
+ "De = 0.6*D0\n",
+ "u0 = 1.06*u2\n",
+ "Vm2 = 0.15*u0\n",
+ "Area = 0.95*math.pi*D/144 *B\n",
+ "Q = Area*Vm2\n",
+ "\t\n",
+ "#Results\n",
+ "print \"Specific speed = %d \"%(round(Ns,-1))\n",
+ "print \" Flow rate = %d cfs\"%(Q)\n",
+ "print \" Eye diameter = %.1f in\"%(De)\n",
+ "\n",
+ "# rounding off error"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Specific speed = 3000 \n",
+ " Flow rate = 183 cfs\n",
+ " Eye diameter = 32.2 in\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file