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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": {}
}
]
}
|
