Download Piping Joints Handbook PDF

TitlePiping Joints Handbook
TagsChemistry Building Materials Mechanical Engineering Pipe (Fluid Conveyance) Building Engineering
File Size750.0 KB
Total Pages161
Document Text Contents
Page 1

Piping Joints
Handbook

Document No. D/UTG/054/00

03000785 (RP2066) May 2000

Page 2

Acknowledgements

This Handbook was originally written and illustrated by
E. Marston (BPE) on behalf of the Forties Field Group in 1991.

This version was updated in May 2000 and edited by
F. Zezula (BP Amoco, UTG, Sunbury) and

C. Durden (BP Amoco, Dyce).

A “hard” pocket size version of this Handbook can be
ordered from XFM Reprographics, BP Amoco, Dyce Office,
Tel. 01224 832547 or via En-Garde quoting Ref. RP2066.

This updated version replaces the document previously
issued under Document No: XEG/G/94/0074.

Further information is available from:

Mechanical Consultant, UTG, Dyce;
Piping & Pressure Systems Consultant, UTG, Sunbury

03000785 May 2000

Page 80

page 78 03000785, May 2000

5.11 Hot Bolting

The removal and replacement of flange bolts on live piping and
equipment is practised for several reasons:

• for replacing corroded or damaged bolts;
• for upgrading the material specification/grades of bolts; or
• to minimise the time spent freeing bolts during plant shutdown.

The practice of removing and replacing or freeing and re-tightening
bolts on live equipment is potentially hazardous and the utmost
caution therefore needs to be exercised when planning and carrying
these operations.

The replacement must only be carried out under permit, and under
controlled conditions. Because it involves working on live equip-
ment, each application must be specially reviewed beforehand.

HOT BOLTING?

Page 81

03000785, May 2000 page 79

Detailed procedures must be in place for the control of hot bolting
and must be observed.

For further information, see EEMUA Information Sheet No. 17 Rev.
1, dated May 1999.

5.12 Restrictions on Hot and Odd Bolting

a) Marginal time savings during shutdowns on disjointing should
not be considered sufficient incentive for Hot Bolting opera-
tions.

b) A formal engineering review of the proposed Hot Bolting oper-
ation must be carried out to establish that there are no unac-
ceptably high external loads and bending moments acting on
the joint. The review should consider, as a minimum, the fol-
lowing:

i) Contents of the line or eqiupment.
ii) Design and operating pressures and temperatures.
iii) Possible upset conditions.
iv) Position and functionality of piping supports.
v) Position and type of expansion bellows fitted.
vi) Maintenance history of the joint.

c) Flanges should have a minimum of 8 bolts.

d) Hot Bolting shall not be considered when the operating pres-
sure exceeds 60% of that specified in ASME/ANSI B16.5,
Annex G, Table G for any given flange rating.

e) A thorough inspection of the flange assembly should be con-
ducted to verify the integrity of the flange and fasteners. These
operations should not be allowed if bolts and nuts show signs
of corrosion, necking or are suspected of having cracks.

Page 160

10. Table of Gauges

03000785, May 2000 page 159

Gauge
No.

Gauge
No.

IN MM IN MM

Imperial
Standard

Birmingham
Wire & Stubs

Imperial
Standard

Birmingham
Wire & Stubs

IN MM IN

4/0

3/0

2/0

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

.400

.372

.348

.324

.300

.276

.252

.232

.212

.192

.176

.160

.144

.128

.116

.104

.092

.080

.072

.064

.056

.048

.040

.036

.032

.028

.454

.425

.380

.340

.300

.284

.259

.238

.220

.203

.180

.165

.148

.134

.120

.109

.095

.083

.072

.065

.058

.049

.042

.035

.032

.028

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

0.609

0.558

0.508

0.457

0.416

0.375

0.345

0.314

0.294

0.274

0.254

0.233

0.213

0.193

0.172

0.152

0.132

0.121

0.111

0.101

0.091

0.081

0.071

0.060

0.050

0.040

.024

.022

.020

.018

.0164

.0148

.0136

.0124

.0116

.0108

.0100

.0092

.0084

.0076

.0068

.0060

.0052

.0048

.0044

.0040

.0036

.0032

.0028

.0024

.0020

.0016

10.160

9.448

8.839

8.229

7.620

7.010

6.400

5.892

5.384

4.876

4.470

4.064

3.657

3.251

2.946

2.640

2.336

2.032

1.828

1.625

1.422

1.219

1.016

0.914

0.812

0.711

11.530

10.795

9.852

8.636

7.620

7.213

6.578

6.045

5.588

5.156

4.572

4.190

3.759

3.403

3.048

2.769

2.413

2.108

1.828

1.651

1.473

1.244

1.066

0.880

0.812

0.711

MM

0.635

0.558

0.508

0.457

0.406

0.355

0.330

0.304

0.254

0.228

0.203

0.177

0.127

0.101

-

-

-

-

-

-

-

-

-

-

-

-

.025

.022

.020

.018

.016

.014

.013

.012

.010

.009

.008

.007

.005

.004

-

-

-

-

-

-

-

-

-

-

-

-

Page 161

11. Decimal Equivalents of Fractions

page 160 03000785, May 2000

F
ra

ct
io

n

D
e

ci
m

a
l

F
ra

ct
io

n

D
e

ci
m

a
l

F
ra

ct
io

n

D
e

ci
m

a
l

F
ra

ct
io

n

D
e

ci
m

a
l

1/64

1/32

3/64

1/16

5/64

3/32

7/64

1/8

9/64

5/32

11/64

3/16

13/64

7/32

15/64

1/4

.015625

.03125

.046875

.0625

.078125

.09375

.109375

.125

.140625

.15625

.171875

.1875

.203125

.21875

.234375

.25

17/64

9/32

19/64

5/16

21/64

11/32

23/64

3/8

25/64

13/32

27/64

7/16

29/64

15/32

31/64

1/2

.265625

.28125

.296875

.3125

.328125

.34375

.359375

.375

.390625

.40625

.421875

.4375

.453125

.46875

.484375

.5

33/64

17/32

35/64

9/16

37/64

19/32

39/64

5/8

41/64

21/32

43/64

11/16

45/64

23/32

47/64

3/4

.515625

.53125

.546875

.5625

.578125

.59375

.609375

.625

.640625

.65625

.671875

.6875

.703125

.71875

.734375

.75

49/64

25/32

51/64

13/16

53/64

27/32

55/64

7/8

57/64

29/32

59/64

15/16

61/64

31/32

63/64

1

.765625

.78125

.796875

.8125

.828125

.84375

.859375

.875

.890625

.90625

.921875

.9375

.953125

.96875

.984375

1.0

Similer Documents