Machine Design Databook, Second Edition

Chapter 16: Packings and Seals

SYMBOLS [1], [2]

A

area of seal in contact with the sliding member, m 2 (in 2)

A g

gasket area over which the bolt loads are distributed, m 2 (in 2)

A 1, A 2

area of cross section of unthreaded and threaded portions of bolt, m 2 (in 2)

b

width of U-collar, m (in) gland width or depth of groove, m (in)

c

radial clearance between rod and the bushing, radial deflection of the ring, m (in)

d

nominal diameter of the bolt, m (in) diameter of sliding member, m (in)

d 1

outside diameter of packing material, m (mm) outside diameter of seal ring (Fig. 16-3), m (in)

d 2

minor diameter of bolt, m (in)

d a

actual diameter of wire, m (in)

d i

inside diameter of packing material, m (in)

D m

estimated mean diameter of conical spring, m (in)

D am

actual mean diameter of conical spring, m (in)

E

modulus of elasticity, GPa (psi)

F b

bolt load, kN (lbf)

F ?

frictional force, kN (lbf)

F ? o

frictional force of the stuffing box when there is no fluid pressure, kN (lbf)

g

acceleration due to gravity, 9.8066 m/s 2 (9806.6 mm/s 2) (32.2 ft/s 2)

h

radial ring wall thickness, m (in)

h i

uncompressed gasket thickness, m (in)

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