Jacketed Piping

8/10/2019 Jacketed Piping

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TCE CONSULTING ENGINEERS LIMITED SECTION: TITLETCE.M6-ME-590-422

DESIGN GUIDE FOR JACKETED PIPING SHEET i OF iii

REV. NO. R0 R1 R2 R3

INITIALS SIGN. INITIALS SIGN. INITIALS SIGN. INITIALS SIGN.

ISSUE

PPD. BY SVR Sd/- RUN Sd/- CSS Sd/- GC

CHD. BY AMM Sd/- RVR Sd/- RVR Sd/- CSS

APD. BY RVR Sd/- RL/MSK Sd/-/Sd/- RL Sd/- RL

DATE 11.09.1990 31.03.1997 02.05.2000 02.06.2003

R3

TCE FORM NO. 020R2

DESIGN GUIDE FOR JACKETED PIPING


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TCE CONSULTING ENGINEERS LIMITED SECTION: TITLETCE.M6-ME-590-422

DESIGN GUIDE FOR JACKETED PIPING SHEET i OF iii

REV. NO. R0 R1 R2 R3

INITIALS SIGN. INITIALS SIGN. INITIALS SIGN. INITIALS SIGN.

ISSUE

PPD. BY SVR Sd/- RUN Sd/- CSS Sd/- GC

CHD. BY AMM Sd/- RVR Sd/- RVR Sd/- CSS

APD. BY RVR Sd/- RL/MSK Sd/-/Sd/- RL Sd/- RL

DATE 11.09.1990 31.03.1997 02.05.2000 02.06.2003

R3

TCE FORM NO. 020R2

FILE NAMES: M6ME422R3.DOC AND

M6ME422R3.DWG


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TCE CONSULTING ENGINEERS LIMITED SECTION: CONTENTSTCE.M6-ME-590-422

DESIGN GUIDE FOR JACKETED PIPING SHEET ii OF iii

TCE FORM NO. 120 R1

ISSUE

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CONTENTS

SL. NO. TITLE SH. NO.

1.0 SCOPE 1

2.0 JACKETED PIPING 1

3.0 JACKETED VALVES 2

4.0 LENGTHS OF HEATING SECTIONS 2

5.0 FLOW DIRECTIONS 3

6.0 BRANCHES 37.0 VENTS AND DRAINS 4

8.0 GENERAL 4

TABLES

1. JACKET AND CORE DIMENSIONS 5

2. JACKET BLANK DIMENSIONS 5

3. JUMPER LOCATION 6

4. LENGTHS OF HEATING SECTIONS 6

FIGURES

1. SPACERS 7

2. WELDING OF CORE AND JACKET PIPES 7

3. JACKET BLANKS 7

4A, 4B & 4C FLANGE TYPES 8

5. REDUCING FLANGE 8

6. JUMPER 9

7. INSTRUMENT STUB 9

8. BRANCH INSTALLATION SEQUENCE 10 & 11


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TCE CONSULTING ENGINEERS LIMITED SECTION: REV. STATUSTCE.M6-ME-590-422

DESIGN GUIDE FOR JACKETED PIPING SHEET iii OF iii

TCE FORM NO. 120 R1

ISSUE

R3

REVISION STATUS

REV. NO. DATE DESCRIPTION

R0 11.09.1990 - -

R1 31.03.1997 Generally revised.

R2 02.05.2000 Generally revised.

R3 02.06.2003 Paras 2.0 and 6.1.9 revised, para 8.3 added and whole

document reformatted.


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TCE CONSULTING ENGINEERS LIMITED SECTION: WRITE-UPTCE.M6-ME-590-422

DESIGN GUIDE FOR JACKETED PIPING SHEET 1 OF 11

TCE FORM NO. 120 R1

ISSUE

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1.0 SCOPE

This design guide gives general recommendations to be followed for jacketed piping in

chemical and industrial plants. Where process collaborator has furnished specificrequirements, such specific requirements shall supersede requirements given in this

guide. The guidelines given in the guide are based on pipe dimensions as per ASME

B36.10.

2.0 JACKETED PIPING

2.1 Jacketed pipe constitutes a core pipe, which conveys the fluid, which needs to be

heated or cooled by a heating or cooling medium flowing in the jacket pipe. Fluids

flowing in the jacket may be steam, hot water, thermic fluid, chilled water and chilled

brine etc.

2.2 Piping is required to be jacketed where a more efficient heat transfer than, what can be

provided by tracing, or tracing with heat transfer cement, is required. Jacketed piping

also provides uniform heat input around the circumference of the core pipe thus

eliminating hot or cold spots that may cause degradation of fluid in the core pipe or

localised freezing. Jacketed piping also provides closer and better temperature control.

Requirements of jacketing are decided by the process or system engineer and are

indicated in P and I Diagrams (P&I Ds).

2.3 Depending on the process requirement, the core and jacket materials can be the same

or different. Also jacketing can be partial or full as dictated by the process

requirements. Full jacketing may require jacketing of pipes, fittings and valves and

specialities. Partial jacketing may require jacketing of only straight pipe with other

items not jacketed or, in some cases, pipes and fittings fully jacketed but valves and

specialities partially jacketed.

2.4 Jackets are broken into heating sections using flanged joints or jacket blanks.

Adjacent jacket sections are connected by "jumper" pipes. Sizes of jumper pipes shall

be as shown in P&I Ds, but generally are of 15 mm (1/2") for steam and 20 mm (3/4")

for hot water or thermic fluids.

2.5 The jacket-core pipe size combinations shall be as stipulated by the process engineer.

If there is no specific requirement, the combinations given in Table 1 can be

considered.

2.6 Core pipe shall be supported and centered within the jacket pipe by spacers located at

120 degrees around the circumference and at intervals given in Table 1. Spacers are

to be welded to core pipe. Spacer material shall be same as that of the core pipe.

Refer Figure 1, for details. Grinding of spacer shall be done if necessary during

fabrication of jacketed piping, to facilitate assembly.


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TCE FORM NO. 120 R1

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2.7 At locations of welds on core pipe, jackets shall be broken to permit examination of

the welds. After successful examination of core pipe welds and completion of leak

tests, the jacket shall be closed. Refer Figure 2. Degree of examination shall dependon the nature of fluid, pressure and temperature. This is to be decided in consultation

with process engineer and as per the applicable code.

2.8 Fittings for core and jacket pipes shall be of butt welding type. Core elbows shall be

of long radius type (R = 1.5D) and jacket elbows of short radius type (R = 1.0D).

The jacket elbow may be split, if necessary, to facilitate assembly on core elbow. In

some cases there may be interference between the elbows and it may be necessary to

draw to scale and check for interference.

2.9 Blanks for jacketed piping shall be as shown in Figure 3. For dimensions, refer Table

2. Material of blanks shall be the same as that of the core pipe. Blanks are used to

split the piping into various heated sections.

2.10 FLANGES

2.10.1 Unless the process demands otherwise, flange size for jacketed piping shall correspond

to core pipe and the jacket connection at the flange shall be as shown in Figure 4.

2.10.2 When process demands that jacket be extended right up to the back of the flange, the

jacket connection at the flange shall be as shown in Figure 5. Flanges shall be of

reducing type i.e. jacket size X core size.

2.10.3 For sizes < 50 mm, where stainless steel core pipe is involved, stainless steel flanges

may be used. For sizes > 80 mm, use either stainless steel stub ends with carbon steel

lap joint flanges or carbon steel slip on flanges with SS liner. Refer Figures 4 and 5.

2.10.4 Where stub ends are used with reducing type flanges, lap diameter of stub end shall

correspond to the jacket size.

2.11 At all flanged joints, jumpers shall also to be provided with flanged joints to facilitate

disassembly. These shall be dimensioned as per Figure 6 and Table 3. Connections to

jackets shall generally be radial. Tangential connections may be required in the case of

Dowtherm heating to avoid formation of pockets.

3.0 JACKETED VALVES

Unless process demands otherwise, jacketed valves shall be of core size and shall have

partial jackets. If process requires full jackets, then valves shall be of core size and

have flanges corresponding to jacket size. Heating or cooling medium connections shall

be provided on the jacket.


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4.0 LENGTHS OF HEATING SECTIONS

4.1 Lengths of heating sections shall generally limited to the values given in Table 4. Whenlengths beyond the values are involved, additional heating or cooling medium supply

and return points shall be provided.

4.2 In the case of water, the above length is from the point of supply on the supply header

to the point of return to the return header.

4.3 Wherever P&I D indicates requirements different from the above, follow the P&I D in

consultation with the process engineer.

5.0 FLOW DIRECTIONS

Steam or other heating vapour supply shall always be at the top of a heating section

and condensate drained from the lower end of the section. In the case of liquid media,

liquid shall enter at the bottom of a jacketed section and exit at the top for proper

venting.

6.0 BRANCHES

6.1 INSTALLATION PROCEDURE

6.1.1 Install core pipe.

6.1.2 Move jacket section over core pipe.

6.1.3 Make cut in core pipe.

6.1.4 Weld branch to core pipe.

6.1.5 Move jacket branch over core branch pipe.

6.1.6 Check weld of core pipe. Leak test core pipe as per specified procedure.

6.1.7 Bring pipe section into alignment using spacers and weld to jacket. If necessary, use

split jacket.

6.1.8 Weld branch jacket.

6.1.9 Check weld of jacket pipe. Leak test jacket pipe as per specified procedure.

Refer Figure 8.


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TCE FORM NO. 120 R1

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6.2 INSTRUMENT CONNECTIONS

Connections for pressure, temperature or flow measurement, made in core pipe shallbe installed as per Figure 7. The jacket shall be locally swaged and welded to core

pipe.

7.0 VENTS AND DRAINS

7.1 All high points on jacket shall be provided with threaded half coupling and plug for

hydro test-purpose. Jumper connections can also be used for the purpose.

7.2 All low points on steam jacket shall be connected to a steam trap.

7.3 Core vents and drains shall be provided only if required by the process engineer.

8.0 GENERAL

The following points shall be borne in mind while designing jacketed pipes if

specifications are not available from the process collaborator.

8.1 Core pipe may be subject to external pressure due to fluid pressure acting in the

jacket. The core pipe shall have adequate thickness to withstand the external pressure.

Design shall be as per ASME Section VIII, Division 1.

8.2 If core and jacket pipes are of different materials (for example, stainless and carbon

steels respectively) having different coefficients of thermal expansion, the assembly may

give rise to column effect on the core pipe. This is to be checked.

8.3 It is not necessary that the core pipe and the jacket pipe be supported at the same

location. Piping engineer shall consider this aspect while showing it clearly in the piping

drawing, carrying out piping flexibility analysis and giving support data to civil engineer.

8.4 Flexibility analysis of jacketed piping may be carried out using programmes such as

CAEPIPE or CAESAR II. If such a programme is not available, the following steps

are suggested:

(a) First convert the jacket-core combination into an equivalent pipe having the

combined moments of inertia of jacket and core pipes and an outside

diameter same as the jacket pipe. Take the difference in modulii of elasticity

between core and jacket materials into account.

(b) Carry out flexibility analysis by conventional methods based on the

equivalent pipe.


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TCE FORM NO. 120 R1

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TCE CONSULTING ENGINEERS LIMITED SECTION: TABLETCE.M6-ME-590-422


TCE FORM NO. 120 R1

ISSUE

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TABLE 3

JUMPER LOCATION (REFER FIGURE 6)

JACKET

DIAMETER mm

(in)

DIMENSION L1 FOR

JACKET FLANGE 150# mm

DIMENSION L1 FOR

JACKET FLANGE 300# mm

40 (1.5) 185 220

50 (2) 200 230

80 (3) 215 250

100 (4) 240 270

150 (6) 275 310

200 (8) 295 335

250 (10) 325 365

TABLE 4

LENGTHS OF HEATING SECTIONS

HEATING OR COOLING MEDIUM

MAXIMUM RECOMMENDED

LENGTH OF EACH HEATED OR

COOLED SECTION, m

Steam 25

Thermic fluid (such as Dowtherm)

Core size 100 mm - 15

150 mm - 12

200 mm - 8

Hot or chilled water 30

Jacketed Piping

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