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GENERIC DESIGN CONSIDERATIONSB.130

e. Pipet

(B4.22)

TABLE B4.3fSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 10(DN 250))

1 in = 25.4 mm

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STRESS ANALYSIS OF PIPING SYSTEMS B.131

f. Branchlet

(B4.23)

g. Reducing elbow

(B4.24)

TABLE B4.3gSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 12 orDN 300)

1 in = 25.4 mm

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GENERIC DESIGN CONSIDERATIONSB.132

where T = wall thickness of large end, in

B = actual bend radius, in R = mean radius of large end, in

ASME B31.1 Power Piping Code.8This code concerns nonnuclear piping such asthat found in the turbine building of a nuclear plant or in a fossil-fuel power plant.Piping services include steam, water, oil, gas, and air. Design requirements of this

TABLE B4.3hSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 14 orDN 350)

1 in=25.4 mm

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STRESS ANALYSIS OF PIPING SYSTEMS B.133

code cover those for pipe, flanges, bolting, gaskets, valves, relief devices, fittings, andthe pressure-containing portions of other piping components. It also includes hangers

and supports and other equipment items necessary to prevent overstressing thepressure-containing components.The loadings required to be considered are pressure; weight (live, dead, and

under test loads); impact (e.g., water hammer); wind; earthquake (whereapplicable); vibration; and those loadings resulting from thermal expansion andcontraction.

TABLE B4.3iSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 16 orDN 400)

1 in = 25.4 mm

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GENERIC DESIGN CONSIDERATIONSB.134

The design equations and stress limits are as follows (terms are the same as thosefor Class 2 and 3 piping except for those defined below):

1.Stress due to sustained loads.The effects of pressure, weight, and other sustainedmechanical loads must meet the requirements of Eq. (B4.25):

(B4.25)

TABLE B4.3jSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 18 orDN 450)

1 in = 25.4 mm

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STRESS ANALYSIS OF PIPING SYSTEMS B.135

where SL= sum of longitudinal stresses due to pressure, weight, and othersustained loads, psi.

2.Stress due to occasional loads.The effects of pressure, weight, other sustainedloads, and occasional loads including earthquake must meet the requirements ofEq. (B4.26):

(B4.26)

TABLE B4.3kSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 20 orDN 500)

1 in = 25.4 mm

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GENERIC DESIGN CONSIDERATIONSB.136

where k= 1.15 for occasional loads acting less than 10 percent of operating period;1.2 for occasional loads acting less than 1 percent of operating period

3. Thermal expansion stress range.The effects of thermal expansion must meet therequirements of Eq. (B4.27):

(B4.27)

TABLE B4.3lSIFs for Typical Weldolet Branch Connections (Run Pipe Size: NPS 24 orDN 600)

1 in = 25.4 mm

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STRESS ANALYSIS OF PIPING SYSTEMS