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Nozzle
Neck (Thickness and Reinforcement)
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ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
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UG-37
Reinforcement Required for Openings in Shells and Formed Heads
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(Enter values in yellow cells for calculations and
in blue cells as information)
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ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
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Page
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UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
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Introduction
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The
following calculation for minimum internally corroded nozzle neck thickness
and reinforcement is based on ASME VIII, Div 1, sections UG-37 and UG-45. Data Input shall be in Page 2.
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Pictures / Sketch
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Nozzle size (NPS):
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in
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Outside diameter of
reinforcing element, Dp:
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in
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Summary
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Nozzle welded on
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Type of Head (If nozzle
is welded on Head)
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Maximum Limit of
Reinforcement (Parallel to vessel wall)
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in
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Maximum Limit of
Reinforcement (Normal to vessel wall outside)
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in
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Maximum Limit of
Reinforcement (Normal to vessel wall inside)
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in
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Shell or Head Nominal
Thickness, ts or
th
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in
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The minimum nozzle
reinforcing pad thickness, te:
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in
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The minimum required
nozzle neck thickness, as per UG-45: (For access openings used only for
inspection)
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in
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The minimum required
nozzle neck thickness, as per UG-45: (For other nozzles)
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in
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The Nozzle Nominal
thickness, tsn:
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in
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Nozzle for:
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Check If tr ≤ t
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Check If trn ≤ tn
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Without reinforcing
element
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Is the available reinforcing area of At greater than the required area of A:
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With reinforcing element
added
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Is the available reinforcing area of At greater than the required area of A:
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ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
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|
|
|
|
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|
Page
|
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|
|
UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
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Formula Data
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Notes
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CA =
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in
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Corrosion Allowance
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U1 =
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default value = 0
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Shell Undertolerance
Allowance (As per UG-16(c) & UG-16(d))
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U2 =
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in
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Shell Undertolerance
Thickness
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D =
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in
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Shell Nominal inside Dia
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Do =
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in
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Shell Outside Dia.
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DH
=
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in
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Head Nominal inside Dia
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DEH
=
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in
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Ellipsoidal Head inside
Dia. with corrosion removed
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LTH
=
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in
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Torispherical Head inner
diameter of the skirt adjusted for corrosion
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d =
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in
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(opening in Parent
Material)
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Finished diameter of
circular opening
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E =
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Assuming E = 1.0
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E1
=
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F =
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1.00
shall be used for all conf. except that Fig. UG-37 may be used for integrally
reinforced openings
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fr
=
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Sn/Sv
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fr1
=
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Sn/Sv for nozzle wall
inserted through the vessel wall
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fr2
=
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Sn/Sv
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fr3
=
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(lesser of Sn or Sp) / Sv
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fr4
=
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Sp/Sv
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h =
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in
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default value = 0
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Nozzle inside projection
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hH
=
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in
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If DH > 0
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For Nozzle welded on
Ellipsoidal Head 2:1. hH= DH/4
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in
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K =
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Factor in the equations
for ellipsoidal heads, Table 1-4.1
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K1
=
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Spherical radius factor
(see Table UG-37)
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LEH
=
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in
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Inside spherical or
crown radius for ellipsoidal head, L = k1D
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M =
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Assuming M = 1.0
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L =
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0
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Applicable for LWNF
only, Figure UG-40 sketch (e)
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P =
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psig
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Pe
=
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psi
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default value = 0
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R =
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in
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Shell Inner radius
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Rv
=
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in
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Shell Inner radius with
corrosion & undertolerance removed
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Rn
=
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in
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Nozzle Inner radius with
corrosion & undertolerance removed
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LHH
=
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in
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Hemispherical Head
inside spherical or crown radius adjusted for corrosion
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Sn
=
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psi
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Material Specification as per ASME II-D Tables
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Sp
=
|
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psi
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Sv
=
|
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psi
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T =
|
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°F
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ts
=
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in
|
Shell Nominal Thk.
|
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Nozzle welded on:
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t =
|
|
in
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Shell Nom. Thk. adjusted
by Tolerances
|
Head Type:
|
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|
If Nozzle is welded on
Head
|
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th
=
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in
|
Head Nominal Thk. After
forming
|
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Nozzle for:
|
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t =
|
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in
|
Head Nominal Thk. After
forming adjusted by tolerances
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t =
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in
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Selected t
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ti
=
|
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in
|
Nozzle Inside Proj. Thk.
|
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tsn
=
|
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in
|
Nozzle Nominal Thk.
|
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tn
=
|
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in
|
Nozzle Nominal Thk.
adjusted by tolerances
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trs
=
|
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in
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|
tre
=
|
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in
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|
|
|
|
|
|
|
trh
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trt
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tr
=
|
|
in
|
Selected tr
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trn
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Check If tr ≤ t
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A41
leg =
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A43
leg =
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
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|
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|
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|
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|
|
|
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|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Nozzle Neck dimensions
(ASME B36.10M & ASME B36.19M):
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
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|
|
|
|
|
|
|
|
|
|
|
|
|
Pipe size (NPS):
|
|
|
in
|
|
|
|
|
Nozzle Neck Nominal
thickness, tsn:
|
|
|
in
|
|
|
|
|
Schedule:
|
|
|
|
|
|
|
|
Nozzle Neck thickness
undertolerance, U3:
|
|
in
|
|
|
|
|
Approximate ID:
|
|
|
in
|
|
|
|
|
(undertolerance = 12.5%)
|
|
|
|
|
|
|
|
|
|
Approximate OD:
|
|
|
in
|
|
|
|
|
Nominal thickness less
'c' & 'U3', tn:
|
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Check If trn ≤ tn
|
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|
|
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|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
Nozzle Neck thickness trn for external
pressure as per Section VIII Div 1 - UG 28(c)
|
|
|
|
|
|
|
|
|
|
|
|
|
trn for external pressure:
|
|
in
|
default value = 0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Nozzle Pad details
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Dp
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
te
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
A42
leg =
|
|
in
|
default value = 0
|
|
|
|
|
|
|
|
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|
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|
|
|
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|
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|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
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|
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|
|
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|
|
|
|
|
|
|
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|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
|
|
|
|
|
|
|
|
|
|
|
|
Page
|
|
|
|
UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Calculations
|
|
|
|
|
|
|
|
|
|
|
ASME VIII Reference
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(a) Calculate limits of
reinforcement
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Parallel to vessel wall,
use larger of :
|
|
|
|
|
|
|
|
|
UG-40
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
d =
|
|
|
in
|
|
|
|
|
|
|
|
UG-40(b)(1)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rn + tn
+ t =
|
|
in
|
|
|
|
|
|
|
|
UG-40(b)(2)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Use
|
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Normal to vessel wall
outside use smaller of:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.5t =
|
|
|
in
|
|
|
|
|
|
|
|
UG-40(c)(1)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.5tn + te =
|
|
in
|
|
|
|
|
|
|
|
UG-40(c)(2)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Use
|
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Normal to vessel wall
inside use smaller of:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
h =
|
|
|
in
|
|
|
|
|
|
|
|
UG-40(c)(1)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.5t =
|
|
|
in
|
|
|
|
|
|
|
|
UG-40(c)(2)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2.5ti =
|
|
|
in
|
|
|
|
|
|
|
|
UG-40(c)(2)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Use
|
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(b) Shell, Head and
nozzle required thickness:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
with:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CA =
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
P =
|
|
psig
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Pe
=
|
|
psi
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DEH
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LTH =
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RV
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LHH =
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rn
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sv
=
|
|
psi
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sn
=
|
|
psi
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
E =
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
K =
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
M =
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Required shell
thickness:
|
|
(Internal Pressure)
|
|
|
|
|
|
Required shell
thickness:
|
|
(External
Pressure)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trs =
|
PRv
|
+ CA
|
|
|
|
|
|
|
|
|
|
trs =
|
PRv
|
+ CA
|
|
|
|
|
|
|
|
SE - 0.6P
|
|
|
|
|
|
|
|
|
|
SE - 0.6P
|
|
|
|
|
|
|
|
trs
=
|
|
in
|
|
|
|
|
|
|
|
|
trs
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Required ellipsoidal
head thickness:
|
(Internal Pressure)
|
|
|
|
|
|
Required ellipsoidal
head thickness:
|
(External
Pressure)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tre =
|
PDEHK
|
+ CA
|
|
|
|
|
|
|
|
|
|
tre =
|
PDEHK
|
+ CA
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
tre
=
|
|
in
|
|
|
|
|
|
|
|
|
tre
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Required hemispherical
head thickness:
|
(Internal Pressure)
|
|
|
|
|
|
Required hemispherical
head thickness:
|
(External
Pressure)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trh =
|
PLHH
|
+ CA
|
|
|
|
|
|
|
|
|
|
trh =
|
PLHH
|
+ CA
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
trh
=
|
|
in
|
|
|
|
|
|
|
|
|
trh
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Required torispherical
head thickness:
|
(Internal Pressure)
|
|
|
|
|
|
Required torispherical
head thickness:
|
(External
Pressure)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trt =
|
PLTHM
|
+ CA
|
|
|
|
|
|
|
|
|
|
trt =
|
PLTHM
|
+ CA
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
|
|
2SE - 0.2P
|
|
|
|
|
|
|
|
trt
=
|
|
in
|
|
|
|
|
|
|
|
|
trt
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Required nozzle neck
thickness:
|
(Internal Pressure)
|
|
|
|
|
|
Required nozzle neck
thickness:
|
(External
Pressure)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
As per Section VIII Div
1 - UG 28(c) - Thickness of Shells
|
|
|
|
|
trn =
|
PRn
|
+ CA
|
|
|
|
|
|
|
|
|
|
and Tubes under External
Pressure
|
|
|
|
|
|
|
SE - 0.6P
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
trn
=
|
|
in
|
|
|
|
|
|
|
|
|
trn
=
|
|
in
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
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Page
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UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
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(c) Determine required
replacement area:
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Notes
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A =
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d tr
F + 2tn tr F(1 - fr1)
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Ref: UG-37 (C)- Design
for Internal Pressure.
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A =
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in2
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(d) Calculate area
contributions:
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Area available in the
vessel wall, use larger value:
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A1.1 =
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d(E1t - Ftr) - 2tn(E1t - Ftr)(1 - fr1)
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A1.1 =
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in2
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A1.2 =
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2(t + tn)(E1t - Ftr) - 2tn(E1t - Ftr)(1 - Fr1)
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A1.2 =
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in2
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Use A1 =
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in2
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Area available in nozzle
projecting outward, use smaller value:
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With reinforcing element
added
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Without reinforcing
element
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A2.1 =
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5(tn - trn)(fr2)(t)
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A2.1 =
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5(tn - trn)(fr2)(t)
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A2.1 =
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in2
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A2.1 =
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in2
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With reinforcing element
added
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Without reinforcing
element
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A2.2 =
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2(tn - trn)(2.5tn + te)(fr2)
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A2.2 =
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5(tn - trn)(fr2)(tn)
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A2.2 =
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in2
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A2.2 =
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in2
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Use A2 =
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in2
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Use A2 =
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in2
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Area available due to
inward projection of nozzle, use smaller value:
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A3.1 =
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5t ti fr2
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A3.1 =
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in2
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A3.2 =
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5ti
ti fr2
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A3.2 =
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in2
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A3.3 =
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2h ti fr2
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A3.3 =
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in2
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Use A3 =
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in2
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|
ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
|
|
|
|
|
|
|
|
|
|
|
|
Page
|
|
|
|
UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
|
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Area available in welds:
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with reinforcing element
added
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Without reinforcing
element
|
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A41
=
|
(leg)2 fr3
|
|
Outward Nozzle Weld
|
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A41
=
|
(leg)2 fr2
|
|
Outward Nozzle Weld
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A41
=
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in2
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A41
=
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in2
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A42
=
|
(leg)2 fr4
|
|
Outer Element/Pad Weld
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A42
=
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in2
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A43
=
|
(leg)2 fr2
|
|
Inward Nozzle Weld
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A43
=
|
(leg)2 fr2
|
|
Inward Nozzle Weld
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A43
=
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in2
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A43
=
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in2
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Area in reinforcing pad:
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A5
=
|
(Dp - d - 2tn)te fr4
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A5
=
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in2
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(e) Total area
available:
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With reinforcing element
added
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Without reinforcing
element
|
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At
=
|
A1 + A2 + A3 + A41 + A42 + A43 + A5
|
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At
=
|
A1 + A2 + A3 + A41 + A43
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At
=
|
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in2
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At
=
|
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in2
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At
=
|
|
in2
|
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|
in2
|
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(A)
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At
=
|
|
in2
|
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|
in2
|
(A')
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Is the available
reinforcing area of At is
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Is the available
reinforcing area of At is
|
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|
|
greater than the
required area of A:
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greater than the
required area of A:
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|
|
|
|
|
|
|
ASME BPVC
VIII-1-2015, UG-45 Nozzle Neck
Thickness and,
|
|
|
|
|
|
|
|
|
|
|
|
Page
|
|
|
|
UG-37 Reinforcement
Required for Openings in Shells and Formed Heads
|
|
|
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|
|
(g) Check nozzle neck
thickness as specified in UG-45.
|
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|
|
For access openings and
openings used only for inspection:
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|
|
tUG-45 = ta
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For all nozzles other
than access openings and openings used only for inspection, determine tb:
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tb = min[tb3, max(tb1, tb2)]
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tUG-45 = max(ta, tb)
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where
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ta
=
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minimum neck
thickness required for internal and external pressure using UG-27 and UG-28
(plus corrosion allowance),
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as applicable.
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tb1
=
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for vessels under
internal pressure, the thickness (plus corrosion allowance) required for
pressure (assuming
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E = 1.0) for the shell
or head at the location where the nozzle neck or other connection attaches to
the vessel.
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tb2
=
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for vessels under
external pressure, the thickness (plus corrosion allowance) obtained by using
the external
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design pressure as an
equivalent internal design pressure (assuming E = 1.0) in the formula for the
shell or
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head at the location
where the nozzle neck or other connection attaches to the vessel.
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tb3
=
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the thickness given in
Table UG-45 plus the thickness added for corrosion allowance.
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tUG-45 =
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minimum wall thickness
of nozzle necks
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NPS =
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in
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trn
=
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in
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ta
=
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in
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trn with corrosion and undertolerance removed
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tb1
=
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in
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tr with corrosion and undertolerance removed
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tb2
=
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in
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tb3
=
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in
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tb
=
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in
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For access openings and
openings used only for inspection:
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Minimum Nozzle Neck
Thickness required, tUG-45 = ta
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in
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For other nozzles:
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Minimum Nozzle Neck
Thickness required, tUG-45 = max(ta, tb)
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in
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Nozzle Neck Nominal
thickness, tsn =
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in
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