Inlet and Outlet Nozzles

"(a) Design for Internal Pressure. The total cross-sectional

area of reinforcement, A, required in any given plane for a

vessel under internal pressure shall be not less than

A = dtrF

where

d = the diameter in the given plane of the finished

opening in its corroded condition, inches.

tr = the thickness in inches which meet the require-

ments of Article D-2 in the absence of the

opening.

F = 1.00 when the plane under consideration is in the

spherical portion of a head or when the given

plane contains the longitudinal axis of a cylin-

drical shell. For all other planes through a

shell, use the value of F determined from Figure

AD-520.1 except that, for reinforcing pads,

F = 1.

(c) Not less than half of the required material shall be on

each side of the centerline of the opening. (See also

AD-540.1 (c).)"

Paragraph AD-540.1 "Boundary Along Vessel Wall" states reinforcement limits:

"(b) Two thirds of the required reinforcement shall be within a

distance on each side of the axis of the opening equal to

the greater of the following:

(1) r + 0.5[SQRTrmt] where Rm is the mean radius of shell or

head, t is the nominal vessel wall thickness, and r is the

radius of the finished opening in the corroded condition.

(2) the radius of the finished opening in the corroded

condition plus the thickness of the vessel wall plus

the thickness of the nozzle wall."

Inherent in the above statements is that for pressure loading only, any

thickness of shell beyond that calculated may be considered as reinforcement

material within the stipulated boundaries.

(7) Inlet and Outlet Nozzles. It shall be assumed that the pipes

leading to the proposed inlet and outlet nozzles have a 4.0 inch inner

diameter and a 0.10 inch thick wall. Because the wall thickness of the

sphere was set at 2.0 inches, the minimum required for the pressure loading,

all reinforcement material for the penetration must be emplaced in the nozzle