Bolt Tightening(Gd 100 a4z 5 90506 Rev1a Ifc)

BOLT TIGHTENING PROCEDURE

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Project No : 5239 ADGAS / IGD Das Island Project

REV. NO. REV. DATEREVISED

PAGE REVISION DESCRIPTIONS

0 20, Jan, 11 - Issued for review

1 07, Mar, 11 All Issued for Construction

1A 06, Oct, 11 16~19 Issued for Construction


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TABLE OF CONTENTS

1.0 SCOPE

2.0 REFERENCES

3.0 SAFETY PRECAUTIONS

4.0 BOLT TIGHTENING

5.0 BOLT TORQUE

6.0 BOLT TENSION

7.0 BOLT TIGHTENING INSPECTION 8.0 OTHERS

Attachment #1 BOLT TENSION PRESSURE FOR B7/ B7M/ L7/ L7M

Attachment #2 BOLT TENSION PRESSURE FOR B8M class2

Attachment #3 TORQUE VALUE FOR ASTM A193 B7/ B7M/ A320 L7/ L7M Attachment #4 TORQUE VALUE FOR ASTM A193 B8M (CLASS2)

Attachment #5 MACHINE BOLT TORQUE VALUE TABLE Attachment #6 GRE FLANGE BOLTING SEQUENCE AND TORQUE VALUES


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1.0 SCOPE

This procedure describes the methods of bolt tightening by the use of calibrated hydraulic

tensioning equipment and manual torque wrenches for IGD-DAS project piping.

The hydraulic bolt tensioning work shall be carried out on all flange bolts diameter 1.1/2” and

larger diameter size. All bolts below 1.1/2” shall be torqued by manual, electric or hydraulic

method.

For equipment flange bolt tightening work, HHI shall obtain all the information such as drawings

or data sheets required for bolt tightening from equipment vendor and shall apply the vendor

recommended bolt tightening values.

2.0 REFERENCES

1) GD-100-A4L-5-90316 : Specification for pipe fabrication, installation, cleaning, flushing and

testing.

2) GD-100-A4L-5-94097 : Specification for pipes.

3) GD-100-A4L-5-94098 : Specification for fitting.

4) GD-100-A4L-5-94099 : Specification for flanges.

5) GD-100-A4L-5-94100 : Specification for bolt/nut.

6) GD-100-A4L-5-94101 : Specification for gaskets.

7) GD-100-A4Z-5-90503 : Fabrication and installation procedure for process & utility piping.

8) ANSI B 16.5 : Steel Pipe Flanges and Flanged Fittings.

9) API RP14E : Recommended practice for design and installation of Offshore production

platform piping systems.

10) Manufacturer’s recommendation : Hydra Tight

3.0 SAFETY PRECAUTIONS

3.1 Special attention shall be paid to this work as bolt tensioning utilizes high pressure hydraulic

oil (maximum 15,000 psi) and shall be conducted diligently, thoroughly and in a safe workman

like manner complying with, as a minimum, COMPANY requirements / expectations.

Perfect thread engagement between the components shall be identified prior to tensioning

work.

Electrical equipment shall be equipped with correct grounding, cables shall be isolated and not

damaged. Only clean and undamaged bolts and nuts, of the correct grade shall be used.

3.2 Bolt tightening work shall be diligently performed in accordance with “Project Health, Safety

and Environmental management plan” procedure.


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3.3 For high elevation or remote area work, suitable scaffolding with safe access shall be erected.

Scaffolding will be suitable for personnel and weight of equipment and mechanical handling

facilities will be provided where necessary. Working at heights will be in full compliance with

COMPANY’s requirements / expectations. ADGAS scaffolding inspectors will check it’s

suitability for the imposed load of operators, torquing equipment and materials.

The operators shall be careful not to drop any components during placing or removing the bolt

tensioning equipment and area below the activity shall be barriered off.

3.4 The operators shall be equipped with safety glasses, hard hats, gloves and safety shoes.

3.5 Operators shall be experienced with bolt tightening or tensioning before they start their activity

for the IGD-DAS project to the requirements of this procedure in correct use of the equipment

for their own safety and that of others. Operators shall keep the calibration certificate which is

carried out by HHI calibration shop with the equipment they are using.

4.0 BOLT TIGHTENING

This document shall be applicable for fabrication & installation at yard as well as module

fabricators yard.

4.1 Torque and Tensioning

Tolerance for rotation and alignment of the flanged joints shall be followed in accordance with

fabrication and installation procedure for process and utility piping (GD-100-A4Z-5-90503) and

ASME B31.3(2008).

Bolt tightening methods are divided into “bolt torque” and “bolt tensioning” according to the

used tools.

Bolt torque is done by torque wrench operated by manual, electric, and hydraulic.

Bolt tensioning is done by utilizing of hydraulic tensioner, and HHI uses HYDRATIGHT product.

All flanges and clamp bolts shall be checked for correct grade and damage prior to fittings.

Bolts and nuts shall be visually inspected prior to use for physical damage, dirt or girt that would

interfere with the assembly or performance. Ensure that gaskets are correct per project

specification and free of any damage.

4.2 Lubricant application

For all bolts/nuts, torque and tensioning, lubricant shall be applied to make it easier to tighten

nuts, and loose when disassembled.


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Lok-cease 20/20, CERTIFIED Co, Product, shall be used (friction factor µ=0.16).

5.0 BOLT TORQUE

For bolt sizes less than 1.1/2”, bolts shall be assembled by torque wrench.

5.1 Assembly instructions by torque wrench

The following bolt-up procedure is to ensure that bolts are uniformly tightened so the gasket is

not prematurely set.

a) After verifying that the gasket type, size and material are in accordance with the

specifications, align the gasket between the flange faces and secure.

b) After verifying that the bolts size and type are in accordance with the specification, install

bolts and nuts by hand, applying lubricant and keeping the thread even.

c) With a short hand wrench, lightly tighten all the bolts using the “crisscross” bolting pattern.

Verify that the gap between the flanges is uniform.

d) Tighten all bolts/nuts with correct torque value with torque wrench.

Tightening shall be carried out complying with steps of 30%, 60%, 100% or 50%, 100%.

e) Check passing is also critical to ensure all bolts achieve the final target torque as setting

will occur during the tightening process on bolted flanges and on hub connector clamps.

f) A hammer tap test will be carried out before signing off the bolt torquing report, this to

ensure that tight thread etc. have not achieved target load.


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< Bolt tightening sequence >

5.2 GRE flanges bolting sequence and torquing values shall be referred to Attachment #6.

Bolt torque value shall be in accordance with AMERON installation recommendation.

5.3 Insulation gasket kit

For insulation gasket kit is installed flange joints, the following vendor recommendation values

shall be applied.


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6.0 BOLT TENSION

6.1 General

For bolt sizes 1.1/2” and larger, hydraulic bolt tensioner shall be used for tightening.

Prior to tensioning of bolts, the hydraulic pump, interconnection hose, bridge, puller, head and

socket shall be checked for any damage or imperfections.

The equipment gauge shall be calibrated so that gauge indicates the correct specific pressure.

Soft brushing of stud bolts and nuts will be required to remove solid particles.

6.2 The operator shall set the correct hydraulic pressure to achieve the specified bolt tension value

for each stud bolt size referring to the tension value tables in ATTACHMENT #1 and #2.

6.3 PB is the final tension pressure which flange bolts should be tightened, and PA is the first

tension pressure which is the greater than PB.

For each step, from the first tension pressure PA to the last tension pressure PB, tension

pressure shall be reduced at a fixed rate for each tensioning. HHI shall prepare the tensioners

to reduce the tensioning times and not to exceed 4 times tensioning.

6.4 The operator shall distribute hydraulic heads over the bolts in a manner to ensure uniform

tensile forces in order not to damage gaskets during tightening.

6.5 The assembly instructions are :


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1) Bolts shall be free running and in good engagement with the tensioner.

2) Assemble the bolt with minimum one bolt diameter on the end to be tensioned and

minimum one thread at untensioned end.

3) Position the socket over the hexagon nut.

4) Place the hydraulic head and bridge assembly over the bolt.

5) Locate the end of the bolt with the puller and screw down onto the ram.

6) Connect the hydraulic coupling to the pump. Apply the tightening oil pressure referring to

the attached values. Turn the hexagon nut using a tommy bar until the nut tightens onto the

flange.

7) Remove the tool.

6.6 Above instructions shall be repeated as per the tensioning plan decided by piping foreman

until all bolts are evenly tensioned.


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Figure-1. Hydratight recommendation

7.0 BOLT TIGHTENING INSPECTION

The COMPANY reserves the right to witness applied hydraulic pressure for flange joint prior to

hydrostatic testing / leak testing activities and reinstatement.

7.1 The inspection notice shall be presented to the COMPANY at least 24 hours prior to the

scheduled start of hydraulic bolt tensioning.

1st value 2nd value 3rd value 4th value

2 timestension

PA PB - -

3 timestension

PAPA+PB

2PB -

4 timestension

PA2*PA+PB

3PA+2*PB

3PB


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The bolt tensioning work and inspection shall be done in the presence of the COMPANY’s

representative and HHI QC inspector.

According to the bolt torque / tensioning, COMPANY inspection and tagging requirement shall

be complied with below table.

7.2 Indication after bolt tightening

Tightening tag shall be attached to all flanges after bolt tightening activity.

All 1.1/2” and larger size bolting shall have the bolt tensioning figures recorded on record sheet.

isometric drawing where bolt tensioning work has bee Ink stamp, showing the tensioning

values, shall be marked on each joint in the n done.

* NOTE

1) Plate : Flexible plastic (white colour)

2) Letter : Black colour

3) Wire : SS304 Φ0.3mm x 220mm

47 mm

130 mm


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8.0 OTHERS

8.1 If hydraulic tension equipment cannot be applied due to space constraints for any reasons,

torque wrench may be used only after obtaining specific approval by COMPANY for each

individual case. In this case, use the torque value in ATTACHMENT #3 and #4.

8.3 Machine bolts in metric sizes shall be torqued as specified in ATTACHMENT #5.

However, it is not expected to have any metric size machine bolts in piping and valves.

This table is included for equipment installation.


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ATTACHMENT #1 : BOLT TENSION PRESSURE FOR B7 / B7M / L7 / L7M

Recommended tension value for HL tensioner (HYDRATIGHT) according to the bolt material B7 / B7M / L7 / L7M.

This table provides up to 4 passes tensioning. Tension values are all produced by BOLTUP®V2.8 CALCULATOR

(www.boltup.com).

HYDRATIGHT RECOMMENDED TENSIONING VALUES FOR

ASTM A190 B7 / B7M / A320 L7 / L7M

FLANGE

SIZE

BOLT

DIA

BOLT

QTY

LOAD

LBF

TOOL

No

1st

(PA)

FINAL

(PB) (PA+PB)/2 (2PA+PB)/3 (PA+2PB)/3

STRESS

(PSI)

%

YEILD

ANSI 150#

36" 1.1/2" 32 56960 HL2 13570 10856 12213 12665 11761

40000 38 HL3 9822 7857 8840 9167 8512

ANSI 300#

24" 1.1/2" 24 56960 HL2 14246 11397 12822 13296 12347

40000 38 HL3 10311 8249 9280 9624 8936

30" 1.3/4" 28 80000 HL3 14619 11695 13157 13644 12670

40000 38 HL4 10958 8766 9862 10227 9497

36" 2" 32 107200 HL4 14239 11391 12815 13290 12340

40000 38 HL5 11343 9074 10209 10587 9830

ANSI 600#

16" 1.1/2" 20 64080 HL2 15136 12108 13622 14127 13117

45000 43 HL3 10955 8764 9860 10225 9494

18" 1.5/8" 20 76500 HL3 12891 10313 11602 12032 11172

45000 43 HL4 9663 7730 8697 9019 8374

20" 1.5/8" 24 76500 HL3 12754 10203 11479 11904 11053

45000 43 HL4 9560 7648 8604 8923 8285

24" 1.7/8" 24 104850 HL4 13523 10818 12171 12621 11720

45000 43 HL5 10772 8618 9695 10054 9336

30" 2" 28 107200 HL4 13869 11095 12482 12944 12020

40000 38 HL5 11048 8838 9943 10311 9575

36" 2.1/2" 28 172800 HL6 14222 11378 12800 13274 12326

40000 38 HL7 11368 9094 10231 10610 9852

40" 2.1/4" 32 155250 HL5 15448 12359 13904 14418 13389

45000 43 HL6 11999 9599 10799 11199 10399

ANSI 900#

14" 1.1/2" 20 71200 HL2 16101 12881 14491 15028 13954

50000 48 HL3 11654 9323 10489 10877 10100

16" 1.5/8" 20 85000 HL3 13826 11061 12444 12904 11983

50000 48 HL4 10364 8291 9328 9673 8982

18" 1.7/8" 20 116500 HL4 14578 11663 13121 13606 12635

50000 48 HL5 11613 9291 10452 10839 10065

20" 2" 20 134000 HL4 16605 13284 14945 15498 14391

50000 48 HL5 13228 10582 11905 12346 11464

24" 2.1/2" 20 194400 HL6 15121 12097 13609 14113 13105

45000 43 HL7 12086 9669 10878 11280 10475

30" 3" 20 254400 HL8 14385 11508 12947 13426 12467 40000 42


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HL8.5 12101 9681 10891 11294 10488

ANSI 1500#

8" 1.5/8" 12 85000 HL3 13767 11014 12391 12849 11932

50000 48 HL4 10320 8256 9288 9632 8944

10" 1.7/8" 12 116500 HL4 14496 11597 13047 13530 12563

50000 48 HL5 11548 9238 10393 10778 10008

12" 2" 16 134000 HL4 16289 13031 14660 15203 14117

50000 48 HL5 12976 10381 11679 12111 11246

14" 2.1/4" 16 155250 HL5 15525 12554 14040 14535 13544

45000 43 HL6 12189 9751 10970 11376 10564

16" 2.1/2" 16 194400 HL6 14989 11991 13490 13990 12990

45000 43 HL7 11980 9584 10782 11181 10383

18" 2.3/4" 16 238500 HL7 14626 11701 13164 13651 12676

45000 43 HL8 12726 10181 11454 11878 11029

20" 3" 16 276425 HL8 15000 12000 13500 14000 13000 43463

47 286200 HL8.5 13065 10452 11759 12194 11323 45000

24" 3.1/2" 16 336313 HL8.5 15000 12000 13500 14000 13000 38217 47

ANSI 2500#

4" 1.1/2" 8 78320 HL2 17689 14151 15920 16510 15330

55000 52 HL3 12803 10243 11523 11950 11096

6" 2" 8 134000 HL4 16615 13292 14954 15507 14400

50000 48 HL5 13236 10589 11913 12354 11471

8" 2" 12 134000 HL4 16238 12991 14615 15156 14073

50000 48 HL5 12936 10349 11643 12074 11211

10" 2.1/2" 12 216000 HL6 16125 12900 14513 15050 13975

50000 48 HL7 12889 10311 11600 12030 11170

12" 2.3/4" 12 291500 HL7 16921 13536 15229 15793 14664

55000 58 HL8 14722 11778 13250 13741 12759


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ATTACHMENT #2 : BOLT TENSION PRESSURE FOR B8M class 2

Recommended tension value for HL tensioner (HYDRATIGHT) according to the bolt material B8M Class2.

This table provides up to 4 passes tensioning.

Tension values are all produced by BOLTUP®V2.8 CALCULATOR (www.boltup.com).


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ATTACHMENT #3 : TORQUE VALUE FOR ASTM A193 B7 / B7M / A320 L7 / L7M

HYDRATIGHT RECOMMENDED TORQUE VALUES FOR

ASTM A193 B7 / B7M / L7 / L7M

FLANGE

SIZE

BOLT

SIZE

BOLT

QTY

RESIDUAL

BOLT LOAD

(N)

RESIDUAL

BOLT STRESS

(PSI)

TORQUE (lbft)

K = 0.16

TORQUE (NM)

K = 0.16

RESIDUAL

YIELD

(%)

ANSI 150#

1/2" 1/2" 4 17125 45000 55 75 43%

1" 1/2" 4 20084 45000 55 75 43%

1 1/2" 1/2" 4 25822 45000 55 75 43%

2" 5/8" 4 41435 45000 108 147 43%

3" 5/8" 4 46039 45000 108 147 43%

4" 5/8" 8 41435 45000 108 147 43%

6" 3/4" 8 68725 45000 190 258 43%

8" 3/4" 8 68725 45000 190 258 43%

10" 7/8" 12 76331 45000 305 413 43%

12" 7/8" 12 85873 45000 305 413 43%

14" 1" 12 112696 45000 454 615 43%

16" 1" 16 100174 45000 454 615 43%

18" 1 1/8" 16 148326 45000 664 900 43%

24" 1 1/4" 20 188960 45000 931 1262 43%

ANSI 300#

1/2" 1/2" 4 22953 45000 55 75 43%

2" 5/8" 8 36831 45000 108 147 43%

3" 3/4" 8 54980 45000 190 258 43%

5" 3/4" 8 68725 45000 190 258 43%

6" 3/4" 12 61852 45000 190 258 43%

8" 7/8" 12 85873 45000 305 413 43%

12" 1 1/8" 16 148326 45000 664 900 43%

16" 1 1/4" 20 188960 45000 931 1262 43%

18" 1 1/4" 24 188960 45000 931 1262 43%

24" 1 1/2" 24 285043 45000 1661 2251 43%

ANSI 600#

1" 5/8" 4 36831 45000 108 147 43%

1 1/2" 3/4" 4 61852 45000 190 258 43%

2" 5/8" 8 46039 45000 108 147 43%

3" 3/4" 8 61852 45000 190 258 43%

4" 7/8" 8 95414 45000 305 413 43%

6" 1" 12 112696 45000 454 615 43%


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8" 1 1/8" 12 164807 45000 664 900 43%

12" 1 1/4" 20 188960 45000 931 1262 43%

16" 1 1/2" 20 285042 45000 1661 2251 43%

18" 1 5/8" 20 340289 45000 2136 2896 43%

24" 1 7/8" 24 466396 45000 3347 4538 43%

ANSI 900#

2" 7/8" 8 85873 45000 305 413 43%

3" 7/8" 8 95414 45000 305 413 43%

4" 1 1/8" 8 148326 45000 664 900 43%

6" 1 1/8" 12 164807 45000 664 900 43%

10" 1 3/8" 16 234599 45000 1261 1710 43%

16" 1 5/8" 20 340289 45000 2136 2896 43%

20" 2" 20 536455 45000 4091 5547 43%

24" 2 1/2" 20 864734 45000 8154 11056 43%

ANSI 1500#

3" 7/8" 8 95414 45000 305 413 43%

4" 1 1/8" 8 148326 45000 664 900 43%

6" 1 1/8" 12 164807 45000 664 900 43%

8" 1 5/8" 12 340289 45000 2136 2896 43%

10" 1 7/8" 12 466396 45000 3347 4538 43%

12" 2" 16 536455 45000 4091 5547 43%

14" 2 1/4" 16 690586 45000 5890 7986 43%

16" 2 1/2" 16 864734 45000 8154 11056 43%

18" 2 3/4" 16 864734 45000 10959 14858 43%

20" 3" 16 864734 45000 14301 19389 43%

24" 3 1/2" 16 864734 45000 22959 31128 43%

ANSI 2500#

1" 7/8" 4 21450 45000 305 413 43%

1 1/2" 1" 4 25335 45000 454 615 43%

2" 7/8" 8 21450 45000 305 413 43%

4" 1.1/2" 8 285042 45000 1661 2251 43%

6" 2" 8 536455 45000 4091 5547 43%

8" 2" 12 536455 45000 4091 5547 43%

10" 2.1/2" 12 864734 45000 8154 11056 43%

12" 2.3/4" 12 864734 45000 10959 14858 43%


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ATTACHMENT #4 : TORQUE VALUE FOR ASTM A193 B8M (CLASS2)

HYDRATIGHT RECOMMENDED TORQUE VALUES FOR

ASTM A193 B8M Class 2 STAINLESS STEEL BOLT

FLANGE

SIZE

BOLT

SIZE

BOLT

QTY

RESIDUAL

BOLT LOAD

(N)

RESIDUAL

BOLT

STRESS

(PSI)

TORQUE

(lbft)

K = 0.16

TORQUE

(NM)

K = 0.16

RESIDUAL

YIELD

(%)

ANSI 150#

1/2" 1/2" 4 18649 32500 40 54 34%

3/4" 1/2" 4 18649 32500 40 54

1" 1/2" 4 18649 32500 40 54 34%

1 1/2" 1/2" 4 18649 32500 40 54 34%

2" 5/8" 4 29925 32500 78 106 34%

3" 5/8" 4 29925 32500 78 106 34%

4" 5/8" 8 29925 32500 78 106 34%

6" 3/4" 8 44671 32500 137 186 34%

8" 3/4" 8 44671 32500 137 186 34%

10" 7/8" 12 62019 32500 220 298 34%

12" 7/8" 12 62019 32500 220 298 34%

14" 1" 12 81391 32500 328 444 34%

16" 1" 16 81391 32500 328 444 34%

18" 1 1/8" 16 107124 32500 479 650 34%

24" 1 1/4" 20 136470 32500 672 911 34%

ANSI 300#

1/2" 1/2" 4 18649 32500 220 298 34%

2" 5/8" 8 29925 32500 78 106 34%

3" 3/4" 8 44671 32500 137 186 34%

5" 3/4" 8 44671 32500 137 186 34%

6" 3/4" 12 44671 32500 137 186 34%

8" 7/8" 12 62019 32500 220 298 34%

12" 1 1/8" 16 107124 32500 479 650 34%

16" 1 1/4" 20 136470 32500 672 911 34%

18" 1 1/4" 24 136470 32500 672 911 34%

24" 1 1/2" 24 205864 32500 731 991 34%

ANSI 600#

1" 5/8" 4 29925 32500 78 106 34%

1 1/2" 3/4" 4 44671 32500 137 186 34%

2" 5/8" 8 29925 32500 78 106 34%


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3" 3/4" 8 44671 32500 137 186 34%

4" 7/8" 8 62019 32500 220 298 34%

6" 1" 12 81391 32500 328 444 34%

8" 1 1/8" 12 107124 32500 479 650 34%

12" 1 1/4" 20 136470 32500 672 911 34%

16" 1 1/2" 20 205864 32500 731 991 34%

18" 1 5/8" 20 205864 32500 947 1284 34%

24" 1 7/8" 24 205864 32500 1484 2012 34%

ANSI 900#

2" 7/8" 8 62019 32500 220 298 34%

3" 7/8" 8 62019 32500 220 298 34%

4" 1 1/8" 8 107124 32500 479 650 34%

6" 1 1/8" 12 107124 32500 479 650 34%

16" 1 5/8" 20 205864 32500 947 1284 34%

20" 2" 20 205864 32500 1790 2427 34%

24" 2 1/2" 20 205864 32500 3538 4798 34%

ANSI 1500#

3" 7/8" 8 62019 32500 220 298 34%

4" 1 1/8" 8 107124 32500 479 650 34%

6" 1 1/8" 12 107124 32500 479 650 34%

8" 1 5/8" 12 205864 32500 947 1284 34%

10" 1 7/8" 12 205864 32500 1484 2012 34%

12" 2" 16 205864 32500 1790 2427 34%

14" 2 1/4" 16 205864 32500 2579 3497 34%

16" 2 1/2" 16 205864 32500 3538 4798 34%

18" 2 3/4" 16 205864 32500 4795 6502 34%

20" 3" 16 205864 32500 6263 8493 34%

24" 3 1/2" 16 205864 32500 10071 13656 34%

ANSI 2500#

1" 7/8" 4 62019 32500 220 298 34%

1 1/2" 1" 4 81391 32500 328 444 34%

2" 7/8" 8 62019 32500 220 298 34%

4" 1.1/2" 8 205864 32500 731 991 34%

6" 2" 8 205864 32500 1790 2427 34%

8" 2" 12 205864 32500 1790 2427 34%

10" 2.1/2" 12 205864 32500 3538 4798 34%

12" 2.3/4" 12 205864 45000 4795 6502 43%


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ATTACHMENT #5 : MACHINE BOLT TORQUE VALUE TABLE

THREAD TYPE

BOLT SIZE

FINAL TORQUE

NON COATED COATED

N.M FT.LBS N.M FT.LBS

Metric

M14 101 75 78 58

M16 156 115 120 89

M20 303 224 233 173

M24 522 386 402 297

M27 773 572 595 440

M30 1047 775 806 597

M33 1427 1056 1099 813

M36 1833 1356 1411 1044

M39 2386 1766 1837 1360

M42 2950 2183 2272 1681

M45 3699 2737 2848 2108

M48 4446 3290 3423 2533

M52 5740 4248 4420 3271

M56 7101 5255 5468 4046

M64 10644 7877 8196 6065

M68 11675 8640 8990 6652

M76 16618 12297 12796 9469

M85 23543 17422 18128 13415


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Rev. No. : 1A

Sheet : 21 / 24


ATTACHMENT #6 : GRE FLANGES BOLTING SEQUENCE AND TORQUING VALUES

Assembly instructions for Bondstrand Fiberglass flanges

1. Scope

These instructions present AMERON’s recommendations for the proper use of Bondstrand

fibreglass flanges.

The mounting of flanges on the pipe is addressed by the assembly instructions for the

particular joint type and adhesive used.

2. Bolt torque value for GRE pipe

Heavy Duty (HD) type flange

The heavy duty type flanges are used for pressures up to 50 barg. HD type flanges are

available with a Quick-lock (size 1~16 inch) or Taper/Taper (size 2~40 inch) adhesive bonded

joint. Heavy duty type flanges can be used when connecting to raised faced metal flanges and

wafer type valves.

Stub-end (Lap joint) type flange.

Stub-end type flanges are suitable for high pressures upto 100 bar. Stub end flanges can be

supplied with an O-ring groove or a flat in combination with suitable gasket. Stub-end type

flanges are available with a quick-lock(size 1~16 inch) or taper/taper (size 2~40 inch) adhesive

bonded joint. Stub-end type flanges can be used when connecting to raised faced metal flange

and wafer type valves.

2.1 Bolt and nut specification for GRE

Bolt and nut is ‘studs A193 B7, Hh nuts A194 2H zinc-plated / bichromate-treated’, which

are the same bolt/nut with carbon steel piping.

HD flange bolt torque values


FOR PIPING

Doc. No. : GD-100-A4Z-5-90506

Rev. No. : 1A

Sheet : 22 / 24


Stub-end flange bolt torque values

3. Alignment

Flange joints shall be installed aligned and stress free. Never pull flanges together by tightening

the bolts. See below table for maximum misalignment allowance.

Flange size range A B

1 – 16 inch 1 mm 2 mm

18 - 40 inch 2 mm 4 mm


FOR PIPING

Doc. No. : GD-100-A4Z-5-90506

Rev. No. : 1A

Sheet : 23 / 24


4. Flange Jointing

Place the gasket between the two flange faces.

Insert the bolts and finger- tighten all nuts. Bolt threads must be clean and lubricated to attain proper torque. Use lubricated washers under both nuts and bolt heads to protect flange back face.

Tighten all nuts following the sequences shown under “tightening sequence”. Do not exceed the torque increments given in “Recommended bolt torques”. After all bolts have been tightened to the recommended torque, re-check the torque on each bolt in the same sequence, since previously tightened bolts may have relaxed.


FOR PIPING

Doc. No. : GD-100-A4Z-5-90506

Rev. No. : 1A

Sheet : 24 / 24


5. Tightening Sequence

Bolt Tightening(Gd 100 a4z 5 90506 Rev1a Ifc)

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