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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Ch:31 Seals packing and gaskets"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 31-1 - Page 816"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "N is 4.47      \n"
+     ]
+    }
+   ],
+   "source": [
+    "from __future__ import division\n",
+    "from math import sqrt, pi, log\n",
+    "d=18#\n",
+    "lg=25+25#\n",
+    "Eb=210*10**3#\n",
+    "Ecl=90*10**3#\n",
+    "A=pi*d**2/4#\n",
+    "kb=A*Eb/lg#\n",
+    "x=(5*(lg+(0.5*d))/(lg+(2.5*d)))#\n",
+    "km=pi*Ecl*d/(2*log(x))#\n",
+    "C=kb/(kb+km)#\n",
+    "sigp=600#\n",
+    "At=192#\n",
+    "Pi=0.75*sigp*At#\n",
+    "F=200#\n",
+    "C=0.322#\n",
+    "Pb=F*C*10**3#\n",
+    "FOS=2#\n",
+    "W=At*sigp#\n",
+    "N=Pb*FOS/(W-Pi)#\n",
+    "print \"N is %0.2f      \"%(N)#"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 31-2 - Page 816"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "p is 6.922 N/mm**2     \n"
+     ]
+    }
+   ],
+   "source": [
+    "from math import sqrt, pi, log\n",
+    "d=16#\n",
+    "D=1.5*d#\n",
+    "t=20#\n",
+    "tg=4#\n",
+    "#Let Gasket diameter in compression zone be d1\n",
+    "d1=D+(2*t)+tg#\n",
+    "lg=40#\n",
+    "E=207*10**3#\n",
+    "kb=pi*d**2*E/(lg*4)#\n",
+    "Ecl=90*10**3#\n",
+    "x=(5*(lg+(0.5*d))/(lg+(2.5*d)))#\n",
+    "kp=pi*Ecl*d/(2*log(x))#\n",
+    "Ag=pi*(d1**2-d**2)/4#\n",
+    "Eg=480#\n",
+    "kg=Ag*Eg/tg#\n",
+    "km=kg*kp/(kg+kp)#\n",
+    "C=kb/(kb+km)#\n",
+    "At=157#\n",
+    "sigp=600#\n",
+    "Pi=0.75*At*sigp/2#\n",
+    "FOS=2#\n",
+    "Pf=At*sigp/FOS#\n",
+    "W=Pf-Pi#\n",
+    "P=W/C#\n",
+    "N=5#\n",
+    "F=P*N#\n",
+    "p=F*4/(pi*120**2)#\n",
+    "print \"p is %0.3f N/mm**2     \"%(p)#"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 31-3 - Page 817"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "d is 20 mm     \n"
+     ]
+    }
+   ],
+   "source": [
+    "from numpy import mat, pi, sqrt\n",
+    "sigp=600#\n",
+    "FOS=3#\n",
+    "siga=sigp/FOS#\n",
+    "d=16#\n",
+    "D=1.5*d+60#\n",
+    "#Let Gasket diameter in compression zone be d1\n",
+    "d1=(300-160)/2#\n",
+    "#Let compressive stress in gasket for leak proof joint be sigl\n",
+    "sigl=12#\n",
+    "At=mat([[1, 157],[2 ,192], [3, 245]])\n",
+    "d=mat([[1 ,16],[2 ,18],[3, 20]])\n",
+    "\n",
+    "n=3#\n",
+    "Pi = range(0,n)\n",
+    "Pc = range(0,n)\n",
+    "for i in range(0,n):\n",
+    "    Pi[i]=At[i,1]*d[i,1]\n",
+    "    Pc[i]=3*pi*(d1**2-d[i,1]**2)\n",
+    "    if (Pi[i]>=Pc[i]):\n",
+    "        print \"The Design is safe\"\n",
+    "\n",
+    "print \"d is %0.0f mm     \"%(d[i,1])#"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}