MS3217C
(g) Impact capacity of ring and groove wall =
IR = PT - For the ring (Inch Pounds) Abutting components to have sharp corners
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IG = Pd - For the groove (Inch Pounds)
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Where:
P =. Allowable thrust load of rings or grooves (Pounds) T = Ring thickness (Inches)
IR = Impact capacity of ring (Inch Pounds)
IG = Impact capacity of groove wall (Inch Pounds)
d = Groove depth (Inches)
1/ X = 150,000 PSI ultimate shear strength for rings of carbon steel or corrosion resistant steel.
X = 110,000 PSI ultimate shear strength for rings of beryllium copper.
2/ s = 250,000 PSI working stress for rings of carbon steel or corrosion resistant steel. s = 180,000 PSI working stress for rings of beryllium copper.
(h) Load capacity with the retained part radiused or chamfered = when the radius or chamfer of the retained part does not exceed the maximum radius allowed for the bottom of the ring groove, the lesser load capacity computed from the formals on pages 5 and 7 will apply. The corner radii and chamfers listed on page 1 were chosen as large as possible for the ring sizes involved and are related to the maximum thrust loads listed in the table below. If the corner radii or chamfers are smaller than those listed, then the thrust loads increase proportionally, in accordance with the following formulas:
P1 = P R R1
P1 = P Ch
Ch1
Where:
P1 = New allowable thrust load
P = Listed allowable thrust load
R1 = New (smaller) corner radius
R = Listed corner radius Ch1 = New (smaller) chamfer Ch = Listed chamfers
Limit loads listed in Table V are based on rings of carbon steel or corrosion resistant steel (working stress 250,000 PSI) and of rings of beryllium copper (working stress = 180,000 PSI) if the allowable groove capacity loads as calculated by using the formula on page 5 are less, then they should be used.
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