Straight Pipe Joint-Sample Calculation 1-20130923

7/29/2019 Straight Pipe Joint-Sample Calculation 1-20130923

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Table of Contents

Table of Contents...............................................................................................................1

Disclaimer..........................................................................................................................1

Nomenclature.....................................................................................................................2

Straight Pipe Joint Sample Calculation 1.......................................................................3

Design Specifications........................................................................................................3

Design of Clamping shell..................................................................................................3

Design Of End Plates.........................................................................................................4

Design Of Joining Flange..................................................................................................5

Design of bolt hole in joining flange.................................................................................7

Appendix A High Strength Bolts Grade 8.8 (consultants, 2007) .............................11

Appendix B Different Types Of Butt Weld .................................................................12

Appendix C Butt And Fillet Weld Size Illustration.....................................................13

Appendix D - Standard and Recommended Weld Preparation Details (AS1210-Figure

3.19.3(D).(c)(PP.170) .....................................................................................................14

Appendix E- General Arrangement And Details Of Bolted Clamp For Straight Pipe

Joint ................................................................................................................................17


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Disclaimer

This report has been written by an undergraduate student. Any information described

herein needs to be verified and approved by a professional engineer prior to be issued

for construction.

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Nomenclature

Ao - outside edge distance of joining flange (mm)

Ab - minimum cross-sectional bolt area required for operating conditions

= W/Sb (mm2)

Ab -

cross-sectional bolt area = (mm2)

Bo - distance between bolt hole centres of joining flanges on opposing sides of

clamping shell (mm)

Ce - minimum distance between inner sides of end plates (mm)

Ce_o - design distance between inner sides of end plates (mm)Db - minimum bolt hole centres distance in joining flange (mm)

Db_s - design bolt hole centres distance in joining flange (mm)

Ds - clamping shell inner diameter (mm)

Do_pipe - pipe outer diameter (mm)

db - bolt nominal diameter (mm)

f - design tensile strength (MPa)

H - total hydrostatic end force (N)

Hc - balancing reaction force outside the bolt circle in opposition to moments

due to loads inside the bolt circle (N)

hc - minimum distance from bolt circle to outer edge of flange (mm)hc_o - design distance from bolt circle to outer edge of flange (mm)

Le - effective length of the clamping shell (m)

Mp - moment due to hydrostatic end load (N.mm)

Mc - balancing moment due toHc(N.mm)

n - total number of bolts required for operating conditions

P - design pressure (MPa)

Po - operating pressure (MPa)

R - minimum radial distance from bolt hole centre to clamping shell (mm)

Ro - design distance from bolt hole centre to clamping shell (mm)

Sb - maximum permissible bolt design stress at design temperature (MPa)

T - design temperature (oC)te - minimum end plate thickness (mm)

te_o - design end plate thickness (mm)

tf - minimum joining flange thickness (mm)

tf_max - maximum allowable joining flange thickness (mm)

tf_o - design joining flange thickness (mm)

ts - minimum clamping shell thickness (mm)

ts_o - design clamping shell thickness (m)

W - minimum bolt load required for operating conditions (N)

- welded joint efficiency

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Straight Pipe Joint Sample Calculation 1

Design Specifications

Operating conditions

Temperature (Max)

250 )

Pressure,po (Max) 2 (MPa)

Material Carbon Steel

Pipe Specifications

Pipe Size

15 N.B, 21.3 O.D

Schedule SMLS: SCH 80: PLAIN ENDS

Standards ASME/ANSI B36.10 ASTM 106B

Clamp Specifications

Welded Joing Efficiency, 1

Stud Bolt M16-Grade 8.8 (Sb = 360 (MPa))

Design tensile strength,f 133 (MPa)

Design Pressure,p po+5 = 7 (MPa)

Design Temperature, T 150~250 (oC)

General arrangement and details of the bolted clamp has been shown in Appendix E

Design of Clamping shell

Clamping shell inner diameter:

(1)

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Minimum clamping shell thickness:

(2)

Design clamping shell thickness:

(3)

Design Of End Plates

Minimum end plate thickness:

(4)

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Checking the fillet weld sizeN(Appendix E, Detail 1), the minimum end plate would

also satisfy the following condition:

(5)

(6)

(7)

Hence, design end plate thickness:

(8)

Design Of Joining Flange

Minimum distance between inner side of end plates

(9)

Design distance between inner side of end plates:

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(10)

Minimum distance from bolt hole centre line to clamping shell:

(11)

From Appendix A, for M16 bolt,D = 34 (mm). Assuming maximum flange thickness

be 22 (mm), from Appendix D, G = 15 (mm). Hence:

(12)

Design distance from bolt hole centre line to clamping shell:

(13)

Effective length of clamping shell:

(14)

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Minimum joining flange thickness

(15)

Design joining flange thickness:

(16)

Design of bolt hole in joining flange

Minimum distance from bolt centre to edge of flange

(17)

Design distance from bolt centre to edge of flange

(18)

Total hydrostatic end force:

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(19)

Distance between bolt hole centres in joining flanges on opposing sides of clamping

shell:

(20)

Balancing moment:

(21)

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Minimum cross sectional bolt area required for operating condition:

(22)

Cross sectional area of each bolt

(23)

Number of bolts required:

(24)

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Hence, 1-M16 bolt required in each flange.

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Appendix A High Strength Bolts Grade 8.8 (consultants, 2007)

Size A B C D E FX

(Min.)

Min.

LengthM12 18 20 8 28 4.6 32 24 25

M16 27 31 11 34 4.6 32 28 40

M20 32 37 14 39 4.6 38 32 40

M24 41 47 16 50 4.6 44 36 50

M30 50 58 20 60 4.6 57 42 75

M36 60 69 24 72 4.6 57 48 90

Note: All dimensions in millimetres.

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Appendix B Different Types Of Butt Weld

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Appendix C Butt And Fillet Weld Size Illustration

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Appendix D - Standard and Recommended Weld Preparation Details

(AS1210-Figure 3.19.3(D).(c)(PP.170)

LEGENDS

=

min.

= 0 to 3 (mm)

= 3 (mm) min.

DimensionsE,Fand G have been designed based on the reccomended of 50o, of 3

mm, and of 3 mm and defined by the following expressions:

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(25)

(26)

Tabulation of and corresponding with various commercial plate thicknesses has

been shown in table below:

Flange thickness,

(mm) (Max)

E (mm) F (mm) G (mm) (Min)

14 6 7 10

16 7 8 11

18 8 9 12

20 9 11 14

22 10 12 15

25 11 14 17

28 13 15 18

30 14 17 20

32 15 18 21

36 17 20 23

40 19 22 25

45 21 25 28

50 24 28 31

55 26 31 34

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Appendix E- General Arrangement And Details Of Bolted Clamp For Straight

Pipe Joint

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Straight Pipe Joint-Sample Calculation 1-20130923