MS16625D
2
fPN s sTE
18 OR P = ALLOWABLE THRUST LOAD EXERTED BY ADJACENT PART (POUNDS).
f = COEFFICIENT OF FRICTION.
s = WORKING STRESS OF RING UNDER MAXIMUM CONTRACTION (P.S.I.) •.
WHERE: T = RING THICKNESS (INCHES).
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.
(g) 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) .
* FOR RINGS OF STEEL X = 120,000 P.S.I. ULTIMATE SHEAR STRENGTH FOR RING SIZES UP TO 3/4 INCH.
X = 150,000 P.S.I. ULTIMATE SHEAR STRENGTH FOR RING SIZES 3/4 INCH AND OVER. S = 250,000 P.S.I. WORKING STRESS.
* FOR RINGS OF BERYLLIUM COPPER X = 110,000 P.S.I. ULTIMATE SHEAR STRENGTH FOR ALL SIZES.
S = 180,000 P.S.I. WORKING STRESS.
(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 BOTIOM OF THE RING GROOVE, THE LESSER LOAD CAPACITY COMPUTED FROM THE FORMULAS ON SHEET 10 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
1
= NEW ALLOWABLE THRUST LOAD.
CH 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 OR STAINLESS STEEL (WORKING STRESS =
250,000 P.S.I. - TABLE I) AND OF BERYLLIUM COPPER (WORKING STRESS = 180,000 P.S.I. - TABLE II),
IF THE ALLOWABLE GROOVE CAPACITY LOADS, AS CALCULATED BY USING THE FORMULA ON SHEET 10
ARE LESS THAN THEY SHOULD BE USED.
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