LIST OF SYMBOLS 



Ad- At 



D 



d 



h 



P 



r 



S.F. 



T 



T° 

 t 



z 

 a 

 5, 



Deformed and total areas of viewports, in. 

 Diameter of high-pressure face, in. 

 Diameter of low-pressure face, in. 

 Elevation of viewport in flange, in. 

 Pressure applied to viewport, psi 

 Radial coordinate, in. 

 Safety factor i 



Time, indicated units 



Temperature, °F 



Thickness of viewport, in. 



Axial coordinate, in. 



Included angle of conical viewport, degrees 



Axial displacement of viewport, in. 



Strain, in. /in. 



Tangential coordinate, degrees 



Principal stresses per unit of applied pressure, psi/psi 



Effective stress per unit of applied pressure, psi/psi 



Yield stress, psi 



55 



