4.11 Jacketed Vessels v4

4.11-1

4.11 Design Rules For Jacketed Vessels (Revision 4)

4.11.0 Table of Contents............................................................................................................ 1 4.11.1 Scope ............................................................................................................................... 1 4.11.2 Design of Jacketed Shells and Heads .......................................................................... 1 4.11.3 Design Of Jacketed Closures ........................................................................................ 2 4.11.4 Design Of Penetrations Through Jackets .................................................................... 2 4.11.5 Design Of Partial Jackets............................................................................................... 2 4.11.6 Design Of Half�Pipe Jackets ......................................................................................... 2 4.11.7 Nomenclature .................................................................................................................. 3 4.11.8 Tables............................................................................................................................... 5 4.11.9 Figures ........................................................................................................................... 14

4.11.1 Scope

4.11.1.1 The minimum requirements for the design of the jacketed portion of a pressure vessel shall conform to the requirements given in this paragraph. The jacketed portion of the vessel is defined as the inner and outer walls, the closure devices and all other penetration or parts within the jacket that are subjected to pressure stress. Parts such as nozzle closure members and stay rings are included in this definition. For the purposes of this section, jackets are assumed to be integral pressure chambers, attached to a vessel for one or more purposes, such as:

a) To heat the vessel and its contents.

b) To cool the vessel and its contents.

c) To provide a sealed insulation chamber for the vessel.

4.11.1.2 This paragraph applies only to jacketed vessels having jackets over the shell or heads as illustrated in Figure 4.11.1, partial jackets as illustrated in Figure 4.11.2, and half�pipe jackets as illustrated in Figure 4.11.3.

4.11.1.3 The jacketed vessels shown in Figure 4.11.1 are categorized as five types shown below. For these types of vessels, the jackets shall be continuous circumferentially for Types 1, 2, 4 or 5 and shall be circular in cross section for Type 3. The use of any combination of the types shown is permitted on a single vessel provided the individual requirements for each are met. Nozzles or other openings in Type 1, 2, 4 or 5 jackets that also penetrate the vessel shell or head shall be designed in accordance with paragraph 4.5. This paragraph does not cover dimpled jackets.

a) Type 1 � Jacket of any length confined entirely to the cylindrical shell

b) Type 2 � Jacket covering a portion of the cylindrical shell and one head

c) Type 3 � Jacket covering a portion of one head

d) Type 4 � Jacket with addition of stay or equalizer rings to the cylindrical shell portion to reduce the effective length

e) Type 5 � Jacket covering the cylindrical shell and any portion of either head.

4.11.2 Design of Jacketed Shells and Heads

4.11.2.1 Shell and head thickness shall be determined using paragraph 4.3. In consideration of the loadings given in paragraph 4.1, particular attention shall be given to the effects of local internal and external pressure loads and differential thermal expansion.

4.11.2.2 The maximum size of inspection openings need not exceed DN 50 (NPS 2) pipe for all diameter vessels

4.11-2 ASME Section VIII, Division 2 ReWrite Revision 4 _______________________________________________________________________________________________

4.11.2.3 The use of impingement plates or baffles at the jacket inlet connection to reduce erosion of the inner wall shall be considered for media where vapors are condensed (i.e. steam).

4.11.2.4 Jacketed vessels may be designed as a braced and stayed surfaces using the rules of paragraph 4.9 provided the jacket wall also meets the requirements of paragraph 4.3. This is not intended to apply to dimpled vessels.

4.11.3 Design Of Jacketed Closures

4.11.3.1 The design of jacket closures members shall be in accordance with Table 4.11.1 and the additional requirements of this paragraph. Alternative geometries to those illustrated may be used if the design is based on Part 5.

4.11.3.2 Any radial welds in closure members shall be butt-welded joints penetrating through the full thickness of the member and shall be ground flush where attachments welds are to be made.

4.11.3.3 Closures for any type of stay-bolted jacket may be designed in accordance with the requirements of Type 1 jackets shown in Figure 4.11.1 provided the entire jacket is stay-bolted to compensate for pressure end forces.

4.11.4 Design Of Penetrations Through Jackets

4.11.4.1 The design of openings through the jacket space shall be in accordance with the rules given in paragraph 4.5. Reinforcement of the opening in the jacket shall not be required for penetrations of the type shown in Table 4.11.2 since the opening is stayed by virtue of the nozzle or neck of the closure member.

4.11.4.2 Jacket penetration closure member designs shown in Table 4.11.2 shall conform to the following requirements stipulated in this table and the following provisions. Alternative geometries to those illustrated may be used if the design is based on Part 5.

a) The jacket penetration closure member minimum thickness considers only pressure membrane loading. Axial pressure loadings and secondary loadings given in paragraph 4.1 shall be considered in the design.

b) The design Details 2, 3, 4, and 5 shown in Table 4.11.2 provide some flexibility. Only pressure membrane loading is considered in establishing the minimum thickness of the penetration closure member. If the localized stresses at the penetration detail need to be established, the methodology in Part 5 shall be used.

c) All radial welds in opening sealer membranes shall be butt-welded joints that penetrate through the full thickness of the member.

d) Closure member welds shall be circular, elliptical or obround in shape where possible. Rectangular members welds are permissible provided that corners are rounded to a suitable radius.

4.11.5 Design Of Partial Jackets

4.11.5.1 Partial jackets include jackets that encompass less than the full circumference of the vessel. Some variations are shown in Figure 4.11.2.

4.11.5.2 The rules for construction of jacketed vessels in the preceding paragraphs also apply to partial jackets, with the following exceptions.

a) Stayed partial jackets shall be designed and constructed in accordance with paragraph 4.9 with closures designed in accordance with paragraph 4.11.3.

b) Partial jackets that, by virtue of their service or configuration, do not lend themselves to staybolt construction may be fabricated by other means provided they are designed using Part 5.

4.11.6 Design Of Half�Pipe Jackets

Revision 4 ASME Section VIII, Division 2 ReWrite 4.11-3 ______________________________________________________________________________________________

4.11.6.1 The rules in this section are applicable for the design of half-pipe jackets constructed of NPS 2, 3 or 4 pipes and subjected to internal pressure loading (see Figure 4.11.3). Configurations that do not satisfy the rules in this paragraph may be designed in accordance with Part 5.

4.11.6.2 The minimum required thickness of a half pipe jacket is given by the following equation. For a design to be acceptable, the additional condition that j jpmP P≤ where jpmP is given by Equation (4.11.2) must also be satisfied.

0.85 0.6j p

rpj j

P rt

S P=

− (4.11.1)

4.11.6.3 The maximum permissible pressure in the half-pipe jacket, jpmP , shall be determine the following equation.

pjpm

p

FP

K= (4.11.2)

where

( )*max 1.5 , 1.5pF S S S = − (4.11.3)

0.5 1.5 2 2.5 3 3.5 4 4.51 2 3 4 5 6 7 8 9 10pK C C D C D C D C D C D C D C D C D C D= + + + + + + + + + (4.11.4)

The coefficients for Equation (4.11.4) are provided in Table 4.11.3.

4.11.7 Nomenclature D is the inside diameter of the inner vessel.

pjD is the nominal pipe size of the half-pipe jacket.

pK is the half-pipe jacket rating factor.

jP is the design pressure in the jacket chamber.

jpmP is the permissible jacket pressure based on the jacket and shell geometry.

L is the length of the jacket.

ct is the nominal thickness of the closure member.

jt is the nominal thickness of the outer jacket wall.

nt is the nominal thickness of the nozzle.

st is the nominal thickness of the shell inner wall.

rjt is the required minimum thickness of the outer jacket wall.

rct is the required minimum thickness of the closure member.

rpt is the required minimum thickness of the half-pipe jacket.

jR is the inside radius of the jacket.

pR is the radius of the opening in the jacket at the jacket penetration

sR is the outside radius of the inner vessel. r is the corner radius of torus closures.

pr is the inside radius of the half-pipe jacket.


S is the membrane stress intensity limit of the inner shell from Part 3.

jS is the membrane stress intensity limit of the jacket from Part 3. *S is the actual longitudinal tensile stress in the head or shell due to internal pressure and other

axial forces; when axial forces are negligible, * 4 sS PD t= . If the combination of axial

forces and pressure results in a negative value of *S , then * 0S = .

js is the jacket space defined as the inside radius of the jacket minus the outside radius of the inner vessel.


4.11.8 Tables

Table 4.11.1 � Design Of Closure Member Of Jacket To Shell

Detail Requirements Figure

1 These closure may used on Types 1, 2, and 4 jacketed vessels as shown in Figure 4.11.1 and shall have rct of at least

equal to rjt and corner radius r shall not

be less than 3 ct .

This closure design is limited to a maximum thickness rct of 16 mm (0.625 in.)

When this construction is used on Type 1 jacketed vessels, the weld dimension Y shall be not less than 0.7 ct ; and when used on Type 2 and 4 jacketed vessels, the weld dimensions Y shall be not less than 0.83 ct .

y = 0.7tc

Min. 2tc but need not exceed

12 mm (0.51in)ts j tj

Rs Rj

rr min. = 3tc

tc

(a) Type 1 Jackets

(b) Types 2 and 4 Jackets

tc min.

30° max.

tc

Min. throatdimension = tc

1.5tc(Elongated tomaintain min.

throat dimension)

tc

tc min.

0.83tc min.




2 These closures shall have rct at least

equal to rjt . In addition for Detail (c), the

rct shall be not less than the following:

0.707 jrc j

j

Pt s

S=

A groove weld attaching the closure to the inner vessel and fully penetrating the closure thickness ct may be used with any of the types of jacketed vessels shown in Figure 4.11.1. However, a fillet weld having a minimum throat dimension of 0.7 ct may also be used to join the closure of the inner vessel on Type 1 jacketed vessels of Figure 4.11.1. The closure and jacket shell may be one-piece construction or welded using a full penetration butt weld. A backing strip may be used.

Rs Rj

ts j tj

1.25tc mintc

r min = j

Rs Rj

ts tj

1.25tc mintc

r= 2tcmim

θ max = 60°

j

(c)

Rs Rj

ts j tj

r= 3tcmin1.25tc min

tc

(b)

(a)

3 This closure shall be used only on Type 1

jacketed vessels shown in Figure 4.11.1.

The closure thickness rct shall be computed using the Equation for a conical shell in paragraph 4.3, but shall be not less than rjt . The angle θ shall be limited to 30 degrees maximum.

Rs Rj

ts j

tc min

tc min

tj

max = 30°θ

tc




4 These closures shall be used only on Type 1 jacketed vessels as shown in Figure 4.11.1 and with the further limitation that rjt does not exceed 16 mm (0.625 in.).

The required minimum thickness for the closure bar shall be equal to:

max 2 , 0.707 jrc rj j

j

Pt t s

S

=

Fillet weld sizes shall be as follows:

[ ]min 0.75 , 0.75c sY t t≥ and

0.7 minc Z=

jZ t≥ and 0.7 minb Z=

ts j

Rs Rj

Y

Y

Y

c

Y

c

tj

tcb

Z Z

(a)

tc

tjts j

Rs Rj

b

ZY

Y

ZY

c

Y

c

Rs Rj

tjts j

Y

Y

Y

c

c

Y

tc

Z

Z

Rs Rj

tjts j

Backing StripMay Be Used

Y

Y

Y

c

c

(b)

(c) (d)

5 These closures may be used on any of the types of jacketed vessels shown in Figure 4.11.1. For Type 1 jacketed vessels, the required minimum closure bar thickness shall be determined from the equations in paragraph 4.11. For all other types of jacketed vessels, the required minimum closure bar thickness and the maximum allowable width of the jacket space shall be determined form the following equations:

( )221.414

2s jj s j s

rcj j j

t tP R S tt

S P R

+ = −

Weld sizes connecting the closure bar to the inner vessel shall be as follows:

[ ]min 1.5 , 1.5c sY t t≥ , and shall be measured as the sum of dimensions a and b as shown. Z is equal to the minimum fillet size necessary when used in conjunction with a groove weld or another fillet weld to maintain the minimum required Y dimension.

tc

(a)Rs

a

b

ZZ

ZZY = a + b

ts Y = a + b

Rs

ts

a

b

ZZ

ZZ

tc

a

b

ts

Z Z

Z

tc

ZY = a + b

Rs

(b)

(c)




6 The jacket to closure bar attachment welds shown in Details (a), (b) and (c) may be used on any of the types of jacketed vessels shown in Figure 4.11.1.

Attachment welds shown in Details (d), (e) and (f) may be used on any of the types of jacketed vessels shown in Figure 4.11.1 where rjt does not exceed 16 mm (0.625 in.).

(a)

See paragraph 4.2

tc

tj min.tj

Rj Rj

tc

tj


45° min.


Rj

tc

2tj min.

See paragraph 4.2

tj

Rj

tc

tj min.0.7 tj min.

NotLess

Than aa

tj

tc

1.5 tj(Elongated toMaintain min.Throat Dimension)

tj min.

Rj

0.83 tj min.tj

tc

tj

30° max.

tj min.

min. ThroatDimension = tj

Rj

(c)

(b)

(d)

(e) (f)

See paragraph 4.2




7 These closures may be used on Type 3 jacketed vessels shown in Figure 4.11.1 shall have attachment welds in accordance with Details (a), (b) or (c). This construction is limited to jackets where rjt does not exceed 16 mm (0.625 in.).

For torispherical, ellipsoidal, and hemispherical heads, the outside diameter of jacket head shall not be greater than the outside diameter of the vessel head, or the inside diameter of the jacket head shall be nominally equal to the outside diameter of vessel head.

See Welding Details(h-2) and (h-3)

Detail (h-1)

At3

tj=16 mm (0.625 in) max

tj max.

Z = 0.83 tj min.

Y = 1.5 tj min.

B

At3

FullPenetrationWeld

tj=16 mm (0.625 in) max

B

At3

(a) for A > B

FullPenetrationWeld

tj=16 mm (0.625 in) max

B

(b) for A = B

(c) for A < B

8 Closures for conical or toriconical jackets shall comply with the requirements for Type 2 jacketed vessels shown in Figure 4.11.1.

See Details 5 and 6

Conical Shell Toriconical Head


Table 4.11.2 � Design Of Jacket Penetration Details


1 The nozzle wall may be used as the closure member where the jacket is welded to the nozzle.

2 minja t= and minjb t=

VesselWall

JacketWall

ts

tjb

t

NozzleNeck

a

NozzleCL

BackingStrip MayBe Used

2 The minimum required thickness, rct , for

the geometries shall be calculated as a shell under external pressure in accordance with paragraph 4.4.

2 minja t= and minjb t=

Attachment A shall be made using details in Table 4.2.6.

tstn

tc

atn

tj

Attachment A

BackingStrip MayBe Used

Rp

NozzleCL

3 The minimum required thickness, rct ,

shall be equal to rjt .


Attachment A

tstn

tc

r

r = 3 tj min.tn

tj


NozzleCL




4 The minimum required thickness, rct , shall be calculated as a shell under external pressure in accordance with paragraph 4.4.

Attachment A shall be made using details in Table 4.2.6. tc

ts

tj

Full PenetrationButt Weld BackingStrip May Be Used

tn

Rp

Attachment ANozzleCL

5 The thickness required of the closure

member attached to the inner vessel, 1rct , shall be calculated as a shell under external pressure in accordance with paragraph 4.4. The required thickness of the flexible member, 2rct , shall be determined as follows: When a tubular section does not exist between jacket and torus:

2 - 0.6rcj j

PrtS E P

=

When a tubular section does exist between jacket and torus:

2 0.6j p

rcj j

P Rt

S E P=

−

2 ja t= , jb t= , and 11.25 cc t=


ts

tj

tn

Rp

Attachment A

b Backing StripMay Be Used

tc1c a

tc2

r

NozzleCL

(a)

ts

tj

tn

Rp

Attachment A

tc1c

tc2b

a

NozzleCL

(b)




6 The minimum thickness, rct , shall be

calculated as a shell of radius pR under external pressure in accordance with paragraph 4.4.

2 ja t= and jb t=


ts

tn b

tc tj

Attachment A

Rp

a

NozzleCL


Table 4.11.3 � Coefficients For Equation (4.11.4)

Shell Thickness (in.) pjD

Coefficients 2 1 3/4 1/2 3/8 1/4 3/16

1C 1.0000E+00 3.6783E+00 -4.0085E+02 -2.6448E+02 4.0084E+02 -1.8874E+04 3.6675E+01

2C 0.0000E+00 -1.2670E+00 3.5653E+02 1.8067E+02 -5.7029E+02 1.7870E+04 1.2307E+01

3C 0.0000E+00 4.5491E-01 -1.3172E+02 -4.9295E+01 3.1990E+02 -7.2846E+03 3.5702E+00

4C 0.0000E+00 -6.2884E-02 2.6480E+01 7.1522E+00 -9.4286E+01 1.6724E+03 -7.9517E-01

5C 0.0000E+00 3.9401E-03 -3.1258E+00 -5.7900E-01 1.6392E+01 -2.3649E+02 5.8791E-02

6C 0.0000E+00 -9.3433E-05 2.1680E-01 2.4758E-02 -1.7431E+00 2.1102E+01 -1.5365E-03

7C 0.0000E+00 0.0000E+00 -8.1908E-03 -4.3668E-04 1.1160E-01 -1.1609E+00 0.0000E+00

8C 0.0000E+00 0.0000E+00 1.3020E-04 0.0000E+00 -3.9550E-03 3.6023E-02 0.0000E+00

9C 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 5.9644E-05 -4.8303E-04 0.0000E+00

2

10C 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

1C -3.2789E+03 8.1206E+00 -1.5045E+03 -1.4264E+04 -3.8104E+04 -3.7589E+03 -1.2551E+04

2C 3.4419E+03 -8.3944E+00 1.4488E+03 1.6228E+04 4.0492E+04 2.9920E+03 1.2150E+04

3C -1.5853E+03 3.7870E+00 -5.9847E+02 -8.0228E+03 -1.8844E+04 -9.4178E+02 -5.0658E+03

4C 4.2063E+02 -7.0886E-01 1.3910E+02 2.2677E+03 5.0415E+03 1.5279E+02 1.1910E+03

5C -7.0856E+01 6.6972E-02 -1.9888E+01 -4.0441E+02 -8.5435E+02 -1.3452E+01 -1.7255E+02

6C 7.8593E+00 -3.1489E-03 1.7923E+00 4.7258E+01 9.5116E+01 6.1167E-01 1.5770E+01

7C -5.7416E-01 5.8511E-05 -9.9521E-02 -3.6233E+00 -6.9589E+00 -1.1236E-02 -8.8782E-01

8C 2.6647E-02 0.0000E+00 3.1165E-03 1.7597E-01 3.2278E-01 -2.1466E-06 2.8149E-02

9C -7.1319E-04 0.0000E+00 -4.2182E-05 -4.9179E-03 -8.6173E-03 0.0000E+00 -3.8489E-04

3

10C 8.3900E-06 0.0000E+00 0.0000E+00 6.0315E-05 1.0095E-04 0.0000E+00 0.0000E+00

1C -5.3121E+00 -2.5017E+02 -3.5172E+00 -4.0098E+02 8.3115E+02 7.3996E+03 -2.1336E+04

2C 3.4091E+00 1.7178E+02 4.3500E+00 4.2603E+02 -7.6253E+02 -6.7593E+03 1.5982E+04

3C -5.5606E-01 -4.6845E+01 -2.7158E-01 -1.7447E+02 2.9501E+02 2.6132E+03 -4.9936E+03

4C 4.2156E-02 6.6874E+00 1.1186E-02 3.7754E+01 -6.1136E+01 -5.4873E+02 8.4914E+02

5C -1.2922E-03 -5.2508E-01 -7.1328E-04 -4.6749E+00 7.4233E+00 6.7572E+01 -8.4931E+01

6C 6.6740E-06 2.1527E-02 2.2963E-05 3.3376E-01 -5.2938E-01 -4.8770E+00 5.0045E+00

7C 0.0000E+00 -3.6092E-04 0.0000E+00 -1.2796E-02 2.0558E-02 1.9113E-01 -1.6106E-01

8C 0.0000E+00 0.0000E+00 0.0000E+00 2.0406E-04 -3.3594E-04 -3.1413E-03 2.1858E-03

9C 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

4

10C 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00


4.11.9 Figures

L

Type 1

L

Type 2 Type 3

L

Type 4

L

Type 5

L

Figure 4.11.1 �Types of Jacketed Vessels


ContinuousPartial Jacket

Multiple orPod Type Jacket

Figure 4.11.2 �Types of Partial Jackets


r

r

R

R

Figure 4.11.3 � Half Pipe Jackets

4.11 Jacketed Vessels v4

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