TABLE 2-1

CLASSIFICATION OF STRESSES FOR SOME TYPICAL CASES (CONTINUED)

Vessel

Location

Origin of

Type of Stress

Classification

Component

Stress

Nozzle

Cross section Internal

General membrane

perpendicular pressure

(av. across full sec-

to nozzle axis or external

tion.)

Pm

load

Stress component

See 4-138

perpendicular to

section

External load Bending across

Pm

or moment

nozzle section

See 4-138

Nozzle wall

Internal

General membrane

PmSee 4-138

pressure

Local membrane

PL

Bending

Q

Peak

F

Differential

Membrane

Q

expansion

Bending

Q

Peak

F

Cladding

Any

Differential

Membrane

F

expansion

Bending

F

Any

Any

Radial

Equivalent linear

Q

temperature

stress [3]

distribution[2]Nonlinear portion of

F

stress distribution

Any

Any

Any

Stress concentration

F

(notch effect)

NOTES:

[1] Consideration must also be given to the possibility of wrinkling and

excessive deformation in vessels with large diameter-to-thickness ratio.

[2] Consider possibility of thermal stress ratchet.

[3] Equivalent linear stress is defined as the linear stress distribution

which has the same net bending moment as the actual stress distribution.

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