Tải bản đầy đủ
AS 4041-1998 (Amdt No. 1) Pressure piping

AS 4041-1998 (Amdt No. 1) Pressure piping

Tải bản đầy đủ

AMDT
No. 1
APR.
2001

TABLE

1.3

PIPING CLASSIFICATION (See Notes 1 and 2)
Limit or requirement
Item No.

1
1.1

Description and
Clause reference

Class 2
piping

Class 1
piping

2A

Steels designated for pressure
purposes

Any

C,
C-Mn
austenitic and ferriticaustenitic stainless steel,
3½% Ni,
1Cr-½Mo

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

Structural pipe and structural
steel (Clause 2.2.4)
1.2

Seamless, hot finished (HFS),
or cold finished (CPS)

1.3

Continuous welded (CW)
(In America this is called BW)
(Clause 2.6.10)(Weld Joint Factor
Table 3.12.2)

2
2.1

C,
C-Mn

C,
C-Mn,
austenitic and
ferritic-austenitic
stainless steel

Not permitted

Any

See Table 2.6.3.4

Non-ferrous metals
(Clauses 2.6.3.5 to 2.6.3.8)

1.5

2P

MATERIAL - (See Section 2)

Ductile iron (Clauses 2.3.2,
2.6.3.4)

1.4

Class 3
piping

Any

Any

Not permitted

Any with
appropriate tests

Not permitted
Both permitted

Not permitted

Permitted to 260°C (see
Clause 2.6.10)

Permitted

Permitted

Electric resistance welded (ERW)
Cold-drawn electric-resistancewelded (CEW)

Permitted with weld joint factor listed in Table 3.12.2

Welds with filler metal added

Permitted with weld joint factor listed in Table 3.12.2

DESIGN (See Section 3)
Design temperature (excluding
material limitations) °C:
(a)
Maximum
(b)
Minimum (MDMT see
Clause 2.11)
Determination (Clauses 3.3, 3.9.4,
3.9.5, 3.9.7, 3.9.8.3, 3.9.9)

None

400°C

99°C

≥ MDMT

≥ MDMT

0°C

180°C
≥ MDMT + 20°C;
and ≥ − 100°C

2.2

Design pressure (excluding
material limitations)

Pressure limits across classes depends upon the fluid type (see Table 1.4)
Determination of design pressure (see Clauses 3.2, 3.9.1, 3.9.2, 3.9.3, 3.9.5, 3.9.6, 3.9.8.1)

2.3

Design strength at room
temperature for C and C-Mn
steels (See Note 5)
(Clause 3.11)

Lower of:

2.4

Re

Lower of:
or

1.5

Rm

Re

2.35

1.5

Lower of:
or

0.72 R e20

Rm

Re

2.35

1.5

or

Rm
2.35

Design factors
Class design factor, (M)
Weld joint factor, (e)
(Clause 3.12)

2.5

Flexibility assessment
(Clauses 3.4 to 3.8 and 3.27.2.2)
Analysis (Clause 3.11 and 3.27)

2.6

Fatigue assessment (Clauses 3.4
to 3.8)
Analysis (Clauses 3.11.7, 3.11.8)

(See end of Table for Notes)

1

0.7 (see Item 7 in
this Table)
0.6 min. (See
Clause 3.14.3(a))

1

1.0 min.

0.6 min.
Required

Required

If required

If required

Required

Required

If required

If required

Not required
(continued)

TABLE

1.3

(continued)
Limit or requirement

Item No.

2.7

Description and
Clause reference

Class 2
piping

Class 1
piping

2A

2P

Welded branch connection (Clauses 3.19, 3.20)

2.8

Minimum included angle
(Clause 3.19.1)

60° (or 45° when
agreed)

45°

External non-integral
reinforcement
(Clause 3.19.8.1, 3.20.3)

Not permitted without
detailed analysis

Permitted

Partial penetration or fillet weld
(Clause 3.20.3.2)

Not permitted without
detailed analysis

Not permitted without
detailed analysis

Not permitted

Socket weld (Clause 3.24.2.3)
Sleeve weld (Clause 3.24.2.4)
Bell and spigot (Clause 3.24.2.5)
Threaded joints (Clause 3.24.3)
Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

Permitted

Not permitted

Permitted

Permitted

Partial penetration butt welds
(Clause 3.24.2.6)

Permitted below DN 65

Permitted

Not permitted

Permitted

Not permitted

Permitted

Permitted T ≤495°C
Permitted by
agreement T >495°C

Permitted

Flanged (Clause 3.24.4)
Flared, flareless and compression
fittings (Clause 3.24.5)

Permitted
Permitted when used within manufacturer’s recommendations, DN 25 practical upper limit

Caulked (Clause 3.24.6)

Not permitted

Soldered (Clause 3.24.7)

Not permitted

Permitted
Permitted below 75°C

Brazed (Clause 3.24.8)
2.9

Permitted below
75°C

Not permitted

Permitted up to 200°C

Bend (Clause 3.15)
Mitre (Clause 3.15.4)

2.10

Permitted cut ≤15°

Permitted

Cut and shut (Clause 3.15.5)

Not permitted

Permitted

Wrinkle (Clause 3.15.3)

Not permitted

Permitted

Ovality (Clause 3.15.2.3)

≤10%

≤12%

Non-pressure attachment (Clause 3.23)
Partial penetration or fillet weld

3.1

Permitted by
agreement

Pipe joint (See Note 6) (Clause 3.24)
Butt weld (Clause 3.24.2.1)

3

Class 3
piping

Not permitted without
Permitted by agreement
detailed analysis
T >250°C
T >250°C

Permitted

WELDING (Includes brazing, see AS 4458, AS/NZS 3992 and Note 3)
Personnel requirements

Option 2

Option 1

Welder certification (AS 1796)

Option 1
Required

or

Not required

Not required

or

Required

Welder qualification
(Clause 6.3)

Required

Required

Required

Not required

Welding supervisor (AS 1796)

Not required

Required

Not required

Not required

3.2

Welding procedure qualification
(Clause 6.3)

Required (except as provided for in Item 3.3)

3.3

Prequalified welding procedure

Permitted but be subject to partial re-qualification
e.g. welder qualification

3.4

Permanent backing ring
(Clauses 2.9.1, 3.20.3.4, 3.24.2.1)

3.5

Fit-up (AS 4458)

3.6

Criteria for weld quality

3.7

Dissimilar joints

Not permitted

Option 2

Permitted

Close limits

Medium limits

Wide limits

Very high

High

Reduced

Permitted
(continued)

TABLE

1.3

(continued)
Limit or requirement

Description and
Clause reference

Item No.

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

4

Class 2
piping

Class 1
piping

2A

Class 3
piping

2P

EXAMINATION AND TESTING (See Section 6)

4.1

Visual

4.2

Penetrant

0 to 100%

0 to 10%

100%
Not required

4.3

Magnetic particle

0 to 100%

0 to 10%

Not required

20 to 100%
(see AS 4037)

0 to 10%
(see AS 4037)

Not required

4.4

Radiographic or ultrasonic

4.5

Pressure tests: (Clause 6.6)
Hydrostatic pressure test
(Clause 6.7)

4.6

Pneumatic pressure test
(Clause 6.8.1)

4.7

Initial service leak test
(Clause 6.9)

Permitted in
conjunction with other
tests by agreement
(Clause 6.8.3)

4.8

Sensitive leak test (AS 4037)

Required where
Required where
specified (Clause 6.8.3) specified (Clause 6.8.3)

4.9

Material test certificate

Required

Normally required

4.10

Marking (Clause 8.3.2)

Required

Normally required

Not required

Normally required

Not normally
required

5

INSPECTION (Depends on hazard
level) (Section 8)

6

CONTROLS

Alternatives to
Item 4.5 include
Items 4.6, 4.7 and
4.8)

Normally required (for alternatives see Clause 6.8)

Permitted by agreement

Permitted in conjunction with other tests
(Clause 6.8.2 and 6.8.3)

Required

Permitted

Not required
Not required

6.1

Pressure control tolerance

+10%

+15%

6.2

Design temperature control
tolerance (see Note 4 )

+ Half the appropriate temperature
interval in Table D2 for the material

+ Double Class 1
and 2 entry, i.e.
100% of appropriate
temperature interval

7

COPPER PIPING
Enquiry No. 109/99

For copper piping joined by brazing, refer to Ruling PE/1 update No. 1 (February 1999) to AS 4041 — 1998,

LEGEND:
MDMT = material design minimum temperature (see Clause 1.7)
Re
= (see Clause 1.7).
Rm
= (see Clause 1.7).
NOTES:
1

This Table outlines the basic difference between the classes, and reference should be made to the text for full details.

2

Materials, design, welding, examination and testing and inspection are shown as ‘permitted’ on the basis that such
items comply in all other respects with this Standard.

3

Welding is taken to include brazing and soldering unless otherwise specified. For detailed requirements, see AS 4458
and AS/NZS 3992.

4

Applies generally except as provided by Clauses 3.4, 3.9.5 and 3.10.3 for the creep range. Examples of the Class 1
upper temperature control tolerance for API 5L B pipe for the listed maximum temperatures are given below:
Maximum
temperature, °C
75
405
475

Class 1 tolerance
°C
+25
+5
+5

5

See Appendix D design strength and Appendix I determination of design strength.

6

See Clause 2.6.2 for possible effect of joint in corrosion performance.

AMDT
No. 1
APR.
2001

Page 12 Table 1.4
Delete Table 1.4 including Footnote and Notes and substitute the following:
TABLE

1.4

APPLICATION OF PIPING CLASSES FOR SERVICE CONDITIONS
Service limits for following classes
Service conditions (see AS 4343)
Class 1
Gas
1

Lethal
Liquid

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

Design
pressure
for fluid
type (see
Note 2
and
Clause
3.2)

2

Very
harmful

Gas
Liquid
Gas

3

Harmful
Liquid

Class 2A

No service
limit

Prohibited
10 MPa max.

No service
limit
No service
limit

10 MPa max.

Nominal size
(see Clause 1.7.21)

Max.

Nominal wall
thickness (see
Clause 3.14.2)

Min.

Prohibited

4 MPa max.

No service limit

No service limit
No service limit

No service limit

Liquid

Design temperature
(see Clause 3.3)

2 MPa max.

Prohibited
No service
limit

Non-harmful

Prohibited

10 MPa max.

Gas
4

Class 3
(see Note 1)

Class 2P

No service
limit

No service limit

180°C

Maximum

No service
limit

400°C

99°C

Minimum

No service
limit (see
Item 2.1
Table 1.3)

No service limit (see
Item 2.1 Table 1.3)

0°C

−100°C (see Item 2.1 of
Table 1.3)

All material

No service
limit

No service limit

No service
limit

No service limit except
DN 150 max. for Type 2
fluid

Carbon steel
Low alloy
steel
High alloy
steel
Non-ferrous
metal

No service
limit

See Table 3.14.2

Carbon steel
Low alloy
steel
High alloy
steel
Non-ferrous
metal

See Clause
3.14.2(a)

See Clause 3.14.2(b)

Ductile &
cast iron

NOTES:
1 See Clause 3.24.2.6 for relaxation for low hazard service.
2 As an example, steam above 90°C is fluid No. 3.

Prohibited

No service limit

AMDT
No. 1
APR.
2001

Page 14 Clause 1.7.12

AMDT
No. 1
APR.
2001

Page 17 Clause 1.7.39 (new)

Delete ‘AS 3920.1’ and substitute ‘AS 4343’.

Insert new definition as follows:
1.7.39

AMDT
No. 1
APR.
2001

Assemblies — a collection of individual components joined together.

Page 17 Clause 1.7.40 (new)
Insert new definition as follows:
1.7.40 Gas — a substance which is completely gaseous at 20°C and 101.3 kPa absolute
or at 50°C has a vapour pressure greater than 300 kPa.

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

For this Standard, gas also includes:

AMDT
No. 1
APR.
2001

(a)

Compressed gas which is entirely gaseous at 20°C and 101.3 kPa absolute.

(b)

Liquefied gas which is partially liquid at 20°C.

(c)

Refrigerated liquefied gas which is partially liquid because of its low temperature.

(d)

Gas in solution which is a compressed gas dissolved in a solvent.

(e)

Any liquid when it is above its atmospheric pressure boiling point, e.g. pressurized
high-temperature water which flashes to steam on release of pressure.

(f)

Fluidized solids in compressed air or other gas.

Page 17 Clause 1.7.41 (new)
Insert new definition as follows:
1.7.41 Liquid — any substance below its atmospheric pressure boiling point, e.g. water
<100°C. Liquid also includes solids fluidized in liquids, e.g. slurries.

AMDT
No. 1
APR.
2001

Page 18 Clause 1.11.1

AMDT
No. 1
APR.
2001

Page 18 Clause 1.17

Delete ‘AS 3920.1’ and substitute ‘AS 4343’.

Delete clause and substitute the following:
1.17 DIMENSIONAL AND MASS TOLERANCES Dimensional and mass
tolerances for pipe, components and assemblies shall comply with the tolerances —

AMDT
No. 1
APR.
2001

(a)

provided with the material component specification;

(b)

according to AS 1210 for assemblies;

(c)

specified in engineering drawings; or

(d)

as otherwise agreed by the parties concerned.

Page 19 Clause 2.2.1
Item (a), add new sentence as follows:
Pipes fabricated in accordance with AS 1210 or equivalent Standard.

AMDT
No. 1
APR.
2001

Page 20 Clause 2.2.1
Item (f), add new sentence as follows:
Fittings fabricated in accordance with AS 1210 or equivalent Standard.

AMDT
No. 1
APR.
2001

Page 27 Clause 2.6.10
Delete clause and substitute the following:

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

2.6.10 Limit of application of pipe made by the CW (BW) process Pipe made by
the CW (BW) process, i.e. continuous weld and furnace butt weld (see Table 1.3) is
limited by this Standard to Classes 2 and 3 and if the pipe is produced to AS 1074, only
Medium and Heavy pipes are permitted. The minimum thickness may be calculated using
the appropriate stress value from Table D2, a weld joint factor of 0.6 and a class design
factor selected from Table 1.3. Additionally, the maximum design condition that medium
and heavy pipe can be used for is 2.0 MPa and 260°C.
AMDT
No. 1
APR.
2001

Page 27 Clause 2.6.11 (new)

AMDT
No. 1
APR.
2001

Page 47 Clause 2.11.6.3

AMDT
No. 1
APR.
2001

Page 51 Clause 3.6.2

AMDT
No. 1
APR.
2001

Page 57 Clause 3.11.7

2.6.11 Limit of application of AS 1074 pipe Pipe to AS 1074 is limited by this
Standard to Classes 2 and 3. The minimum thickness may be calculated using the
appropriate stress value from Table D2, and a weld joint factor of 0.85 for ERW and a
class design factor selected from Table 1.3.

Item (b), fourth paragraph, delete ‘nominal0’ and substitute ‘nominal’.

Delete ‘FEMA’ and substitute ‘FMEA’.

Delete from ‘F = stress range reduction factor . . .’ to end of Clause and substitute the
following:
F

=

stress-range reduction factor for the total number of displacement
cycles over the design lifetime. See Table 3.11 or calculate using
equation:
F = 6(N)−0.2 but ≤1.0
N = equivalent number of full displacement cycles during the
expected service life of the piping system

fc

=

design strength at the minimum metal temperature expected during
operation or shutdown, in megapascals (see Note)

fh

=

design strength at maximum metal temperature expected during
operation or shutdown, in megapascals (see Note)

fL

=

sustained longitudinal stress, in megapascals.

In the determination of fa, the value of the weld joint factor (e) shall be taken as unity.
In no case shall the value exceed the minimum of
temperature (see Appendix D).

Rm
3

and 2

ReT
3

at minimum metal

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

AMDT
No. 1
APR.
2001

Page 59 Clause 3.12.2

AMDT
No. 1
APR.
2001

Page 60 Table 3.12.3

AMDT
No. 1
APR.
2001

Page 61 Table 3.14.2

Item (d), delete piping class ‘3’ and substitute ‘2, 3’.

Delete class design factor ‘0.6’ and substitute ‘0.7’.

1

Steel group C, Class 3 piping, delete ‘10’ and substitute ‘0’.

2

Steel group E, Class 3 piping, delete ‘10’ and substitute ‘0’.

AMDT
No. 1
APR.
2001

Page 63 Clause 3.15.2.2

AMDT
No. 1
APR.
2001

Page 64 Clause 3.15.2.2

AMDT
No. 1
APR.
2001

Page 64 Table 3.15.2.2

AMDT
No. 1
APR.
2001

Page 71 Clause 3.19.7.3

AMDT
No. 1
APR.
2001

Page 72 Clause 3.19.7.4

AMDT
No. 1
APR.
2001

Page 72 Clause 3.19.7.5

AMDT
No. 1
APR.
2001

Page 72 Clause 3.19.7.6

AMDT
No. 1
APR.
2001

Page 72 Clause 3.19.7.7

Item (b), third line, delete ‘thickness t1’ and substitute ‘thickness ti’.

In the first sentence delete ‘where the more’.

In heading to Columns 2 and 3, delete ‘tb = 1.25tf’ and substitute ‘tb = 1.125tf’.

First paragraph, delete ‘greater’ and substitute ‘smaller’.

First paragraph, delete ‘(see Appendix K)’ and substitute ‘(typically MSS SP97 and see
Appendix K)’.

First paragraph delete ‘The nominal size of a small bore branch’ and substitute ‘The
nominal size of small bore branch pipe, socket or coupling’.

Item (a), delete ‘DN 50’ and substitute ‘DN 25’.

Item (a), delete ‘50 mm and’ and substitute ‘DN 25 or’.

AMDT
No. 1
APR.
2001

Page 74 Clause 3.19.8.2
1

First paragraph, delete ‘the effects of corrosion, erosion and other items specified
in Clause 3.13, nor does it illustrate any’.

2

Notation for Do, delete notation and substitute the following:
Dob = outside diameter of branch pipe, in millimetres


3

Notation for d1, delete


and substitute [Dob

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

4

5
6
AMDT
No. 1
APR.
2001

[Dob − 2(tb − G)]



sin α

− 2(tb − G b)] .
sin α

Notation for d2, delete ‘ 

(tb − G) +

‘
substitute (t − G ) + (t − G )
 b
b
h
h

Notation for L, delete ‘2.5(tb
‘2.5(tb − Gb) + tr or 2.5(th − Gh)’.

(th − G)

’
d1 

2

’
d1  .

2
− G) + tr or 2.5(th − G)’ and substitute

Notation for tn, delete ‘tn’ and substitute ‘th’.

Page 79 Figure 3.19.8.2
Delete Items (a) and (b) and Notes and substitute the following:

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

AMDT
No. 1
APR.
2001

NOTES:
1 Reinforcing saddles are to be used only on 90° branches.
2 When a ring or pad is added as reinforcement (see Figure 3.19.8.2(b)), the value of reinforcing area may
be taken in the same manner in which excess material in the main pipe is considered, provided a full
penetration weld is used between the branch, main pipe, and ring or pad.
3 The ratio of the width to thickness of a ring and a pad shall be as close to 4:1 as the available horizontal
space allows within the limits of the reinforcing zone along the main pipe and the outside diameter of the
branch allows, but the ratio shall be not less than 1:1.

FIGURE 3.19.8.2 (in part)

REINFORCEMENT OF BRANCH CONNECTIONS

AMDT
No. 1
APR.
2001

Pages 80 to 81 Clause 3.19.8.4
1 Delete Equation 3.19.8.4(1) and substitute ‘ A7 = (tmh − G h)d1 (2 − sin α) ’.
2 Delete Equation 3.19.8.4(2) and substitute ‘ A7 = 0.5(tmh − G h)d1 (2 − sin α) ’.

AMDT
No. 1
APR.
2001

Pages 82 to 84 Clauses 3.19.9.2 to 3.19.9.5 including Figure 3.19.9.2:
Delete Clauses and Figure and substitute the following:
3.19.9.2
Dc

Notation

The notation is as follows (see also Figure 3.19.9.2):

= corroded internal diameter of main pipe, in millimetres

Doh = outside diameter of main pipe, in millimetres
dc

= corroded internal diameter of extruded outlet measured at the level of the
outside surface of the main pipe, in millimetres

H

= height of the reinforcement zone, in millimetres

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

= 0.7(DobTo)1/2
K

= factor determined by the ratio of branch diameter to main pipe diameter
(see Clause 3.19.9.4)

tb

= actual (by measurement), or minimum wall thickness of branch pipe,
permissible in the pipe specification, in millimetres

th

= actual (by measurement), or minimum wall thickness of main pipe,
permissible in the pipe specification, in millimetres

To

= corroded finished thickness of extruded outlet, measured to a point on or
beyond the outside surface of the main pipe, in millimetres

Dob = outside diameter of branch, in millimetres
d1

= corroded inside diameter of branch, in millimetres

ho

= height of the extruded outlet, in millimetres
≥ ro, (except as shown in Figure 3.19.9.2(b))

r1

= half-width of reinforcement zone, in millimetres
= dc

ro

= radius of external contoured portion of outlet measured in the plane
containing the axes of the main pipe and branch (see Clause 3.19.9.3), in
millimetres

tmb

= required wall thickness of branch, in millimetres

tmh

= required wall thickness of main pipe, in millimetres.

3.19.9.3 Radius of external contour The radius of the external contoured portion of an
outlet (see Figure 3.19.9.2) shall comply with the following:
(a)

(b)

Minimum value of ro:
(i)

For outlet outside diameter ≤760 mm . . . . . . . . . . . . 0.05Dob mm.

(ii)

For outlet outside diameter >760 mm . . . . . . . . . . . . 38 mm.

Maximum value of ro:
(i)

For outlet outside diameter <190 mm . . . . . . . . . . . . 32 mm.

(ii)

For outlet outside diameter ≥190 mm . . . . . . . . . . . . (0.10Dob + 13)mm.

AMDT
No. 1
APR.
2001

(c)

More than one radius:
Where the external contour contains more than one radius, the radius of best fit of
any arc sector of 45° shall comply with Item (a) and the radius at any point shall
comply with Item (b).

Machining shall not be employed to achieve compliance with the requirements of
Items (a), (b), and (c).
3.19.9.4 Required reinforcement area The required reinforcement area is defined as
equal to K(tmh − Gh) dc, where K shall be determined as follows:
(a)

For Dob/Doh ≤ 0.15 . . . . . . . . . . . . . . . . . . . . . . K = 0.70.

(b)

For Dob/Doh > 0.15 and ≤ 0.60 . . . . . . . . . . . . . . K = 0.60 + 2/3 × (Dob/Doh).

(c)

For Dob/Doh > 0.60 . . . . . . . . . . . . . . . . . . . . . . K = 1.00.

3.19.9.5
+ A 3,

Reinforcement area

The area required for reinforcement (AR) shall be A1 + A 2

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

where
A1

A2

A3

=

area lying within the reinforcement zone resulting from any excess
wall thickness available in the main pipe

=

dc(th − tmh)

=

area lying within the reinforcement zone resulting from excess wall
thickness available in the branch pipe

=

2H(tb − tmb)

=

area lying within the reinforcement zone resulting from excess
thickness available in the extruded outlet lip

=

2ro(To − tb − Gb)