MS16627C
2
fPN s sTE
18 OR P = ALLOWABLE THRUST LOAD EXERTED BY ADJACENT PART (POUNDS)
f = COEFFICIENT OF FRICTION
WHERE: s = WORKING STRESS OF RING UNDER MAXIMUM CONTRACTION (PSI) 2/
T = RING THICKNESS (INCHES)
2
P s sTE
E = GREATEST WIDTH SECTION OF RING (INCHES)
f18N N = NEUTRAL RING DIAMETER (INCHES) = FREE DIAMETER MINUS 3/4 E DIMENSION
IN SUCH CASES WHERE DIFFERENTIAL ROTATION OCCURS, THE CALCULATION SHOULD BE BASED ON THE MAXIMUM POSSIBLE VALUE OF THE COEFFICIENT OF FRICTION.
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.
(f) IMPACT CAPACITY OF RING OR GROOVE WALL=
IR = PT FOR THE RING (INCH POUNDS) ABUTTING COMPONENTS TO HAVE SHARP CORNERS
2
I Pd
G = 2
FOR THE GROOVE (INCH POUNDS).
WHERE:
P = ALLOWABLE THRUST LOAD OF RING OR GROOVE (POUNDS) T = RING THICKNESS (INCHES)
I
G = IMPACT CAPACITY OF GROOVE WALL (INCH POUNDS)
d = GROOVE DEPTH (INCHES)
I
R = IMPACT CAPACITY OF RING (INCH POUNDS)
(g) 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 BOTIOM OF THE RING GROOVE, THE LESSER LOAD CAPACITY COMPUTED FROM THE FORMULAS ON PAGE 7 WILL APPLY. THE CORNER RADII AND CHAMFERS LISTED ON TABLE I
WERE CHOSEN AS LARGE AS POSSIBLE FOR THE RING SIZES INVOLVED AND ARE RELATED TO THE MAXIMUM THRUST LOADS LISTED IN TABLE V.
IF THE CORNER RADII OR CHAMFERS ARE SMALLER THAN THOSE LISTED, THEN THE THRUST LOADS INCREASE PROPORTIONALLY, IN ACCORDANCE WITH THE FOLLOWING FORMULAS:
1 1
P = PCH OR P
= NEW ALLOWABLE THRUST LOAD
CH1 P = LISTED ALLOWABLE THRUST LOAD
1
WHERE: CH
= NEW (SMALLER) CHAMFER
CH = LISTED CHAMFER
1 1
P = PR R
1
= NEW (SMALLER) CORNER RADIUS
R R = LISTED CORNER RADIUS
LIMIT LOADS LISTED IN TABLE V ARE BASED ON RINGS OF STEEL (WORKING STRESS = 250,000 PSI) AND OF BERYLLIUM COPPER (WORKING STRESS = 180,000 PSI). IF THE ALLOWABLE GROOVE CAPACITY LOADS, AS CALCULATED BY USING THE FORMULA ON PAGE 7 ARE LESS THEN THEY SHOULD BE USED.
8
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