Corten Steel Pipes

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1. Scope
1.1 This specification covers minimum-wall-thiclcness, seamless and electric-resistance welded, low-alloy
steel tubes for pressure containing parts such as economizers or other applications where cossosion resistance
is important.

1.2 The tubing sizes and thicknesses usually furnished to this specification are % to 5 in. [12.7 to 127 mm] in
outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 m] inclusive, in minimum wail thicknesses. Tubing having
other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

1.3 Mechanical property requirements do not apply to tubing smaller than % in. [3.2 mm] in inside diameter
or 0.015 in. [0.4 mm] in thickness.

1.4 An optional supplementary requirement is provided and, when desired, shall be so stated in the order.

1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within
the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore,
each system must be used independently of the other. Combining values from the two systems may result in
nonconformance with the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

2. Referenced Document
2.1 ASTM Stnizdni-d: E 213 Practice for Ultrasonic Examination of Metal Pipe
and Tubing
E 273 Practice for Ultrasonic Examination of Longitudinal Welded Pipe and TubingA 4501A 450M Specification for General Requirements for Carbon, Fenitic Alloy, and Austenitic Alloy Steel
Tubes
3. Ordering Information
3.1 Orders for material under this specification shall include the following, as required, to describe the desired
material adequately;

3.1.1 Quantity (feet, metres, or number of lengths),

3.1.2 Name of material (seamless or electric-resistance welded tubes),

3.1.3 Grade (Table 1),

3.1.4 Manufacture (hot finished or cold finished),

3.1.5 Size (outside diameter and minimum wall thiclcness)

3.1.6 Length (specific or random),

3.1.7 Optional requirements (hydrostatic or electric tcst, 13.7),

3.1.8 Test report required (see Certification Section of Specification A 4501A 450M),

3.1.9 Specification designation, and

3.1.10 Special requirements and any supplementary requirements selected.

4. Manufacture
.I Tubes made by the seamless process may be hot finished or cold finished.

5. Heat Treatment
5.1 All tubes shall be nomalized or given such heat treatment as may be necessary to conform to the requirements of this specification.

§A-423lSA-423M

6. Chemical Composition
6.1 The steel shall conform to requirements as to chemical composition prescribed in Table 1.

7. Product Analysis
7.1 An analysis of either one billet, one length of flatrolled stock or one tube shall be made from each heat.
The chemical composition thus determined shall confo~m to the requireinents specified.

7.2 If the original test for product a~lalysisfa ils, retests of two additional billets, lengths of flat-rolled stocli, or
tubes shall be made. Both retests, for the elements in question shall meet the requirements of the specification;
otherwise all remaining material in the heat or lot (Note 1) shall be rejected or, at the option of the producer, each billet, length of flat-rolled stock or t~lbe may be individually tested for acceptance. Billets, lengths of flatrolled stock or tubes which do not meet the requirements of the specification shall be rejected.

NOTE 1-For flatten~ng, flaring, and Range requirements, the term lot applies to all tubes prior to cutting of the same noiniiial slze and wall
thickness that are produced from the same heat of steel. When final lieat treatment IS In a batch-type furnace, a lot shall include only those
tubes of the same size and from the same heat which are heat treated In the same furnace charge. When the final heat treatment is in a
continuous furnace the number of tubes or the same size and from the same heat In a lot shall be deternlined from the size of the lubes as
prescribed in Table 2.

NOTE 7-FOI tensile and haldness test requirements, the tenn lot applies to all tubes pnor to cutting, ot the same nom~nal dlarneter and
wall th~ckness that are produced lrom the same heat of steel When final heat treatment is in a batch-type furnace, a lot shall include only
those tubes or the same size and the same heat wh~cha re heat lreated in the same furnace charge When the final heat tredtnlent is In a
contmuous furnace, a lot shall ~nclude all tubes of the same size and heat, heat treated in the same furnace at the same temperature, t ~meat
heat, and lu~naces peed

8. Tensile Requirements
8.1 The material shall conform to the requirements as to tensile properties prescribed in Table 3.

9. Hardness Requirements
9.1 The tubes shall have a hardness number not exceeding 170 HB or 87 HRB.

10. Forming Operations
10.1 Tubes when inserted in the boiler shall stand expanding and beading without showing cracks or flaws.

11. Mechanical Tests Required
11.1 Tension Test -One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension
tests shall be made on specimens from two tubes for lots of more than 50 tubes (Note 2).

11.2 Flatteizirzg Test -One flattening test shall be made on specimens from each end of one finished tube,
not the one used for the flaring or flanging test, from each lot (Note 1).
11.3 Flaring Test (Searizless Tubes) -One flaring test shall be made on specimens from each end of one finished
tube, not the one used for the flattening test, from each lot (Note 1).

11.4 Flange Test (Welded Tubes) -One flange test shall be made on specimens fsorn each end of one finished
tube, not the one used for the flattening test, from each lot (Note 1).

11.5 Hardness Test -Brine11 or Rockwell hardness tests shall be made on specimens from two tubes from
each lot (Note 2).

11.6 Reverse Flattei~ing Test -For welded tubes, one reverse flattening test shall be made on a specimen from
each 1500 ft [460 m] of finished tubing.

11.7 Hydrostatic or Noizdestructive Electric Test - Each tube shall be subjected to the hydrostatic test, or,
instead of this test, a nondestructive electric test may be used when specified by the purchaser.

12. General Re
12.1 Material furnished under this specification should conform to thc applicable rcquircmcnts of thc
cursent edition of Specification A 4501A 450M, e unless otherwise provided herein.
13. Product Marking
13.1 In addition to the marking prescribed in Specification A 4501A 450M, the marking shall include whether
hot finished or cold finished, and whether seamless or welded.

14.4 Seamless steel tube; steel tube; alloy; welded steel tube  PART A - FERROUS MATERIAL SPECIFICATIONS
TABLE 1

CHEMICAL REQUIREMENTS
Composition, %
Grade 1 Grade 2
Carbon, ma:: 0.15 0.15
Manganese, max 0.55 0.50-1.00
Phosphorus 0.06-0.16 0.04 max
Sulfur, max 0.060 0.05
Silicon, min 0.10 . . .
Copper 0.20-0.60 0.30-1.00
Chromium 0.24-1.31 . . .
Nickel 0.20-0.70 0.40-1.10
Molybdenum, min . . . 0.10
TABLE 2
NUMBER OF TUBES IN A LOT HEAT TREATED BY THE CONTINUOUS PROCESS
Size of Tube 2 in. C50.8 rnml and over in outside diameter and 0.200 in. C5.1 rnml and over in ?ntall
Thickness Less than 2 in. C50.8 rnml but over 1 in. C25.4 rnml in outside diameter or over 1
in. C25.4 mnil in outside diameter and under 0.200 in. C5.1 rnml in wall thickness  1 in. C25.4 rnml or less in outside diameter Size of Lot not more than 50 tubes not more than 75 tubes not more than 125
Tubes

TABLE 3

TENSILE REQUIREMENTS
Tensile strength, min, ltsi CM Pal 60 C4151 Yield strength, min, or 50 mm, ltsi CMPal 37 C2551 Elongation in 2 in. or 50 mm, min, % 25 For longitudinal strip tests a deduction for each 1.25~ '4, in. 10.8 rnml decrease in wall thickness below 3/,, in. C8 rnml from the basic minimum elongation of the following percentage points shall be made A Calculated elongation requirements shall be rounded to the nearest whole number.

 

 


 

 

Specification for High-Test,Wrought, Butt-WeldingFitting

TABLE OF CONTENTS
SECTION PAGE
1 SCOPE ............................................................................................................................ 1
2 PRESSURE RATING ....................................................................................................... 1
3 SIZE ............................................................................................................................... 2
4 DESIGN PROOF-TEST .................................................................................................... 2
5 HYDROSTATIC TESTING .............................................................................................. 3
6 MATERIALS ................................................................................................................... 3
7 CH'EMICAL COMPOSITION ................................. '" ..................................................... 3
8 TENSILE PROPERTIES .................................................................................................. 3
9 HEAT TREATMENT ........................................................................................................ 4
10 TRANSVERSE GUIDED-WELD BEND-TESTS .......... · ................................................... .4
11 NOTCH-TOUGHNESS PROPERTIES ............................................................................. 5
12 FI,!'1'ING DIMENSIONS ................................................................................................. 5
l3 TOLERANCES FOR WELDING FITTINGS .................................................................... 5
14 MANUFACTURE ............................................................................................................ 6
15 NONDESTRUCTIVE EXAMINATION ........................................................................... 7
16 INSPECTION .................................................................................................................. 7
17 MARKING ....................................................................................................................... 8
TABLE 1
2
3
4
5
6
7
8
9
FIGURE 1
2
3
4
5
ANNEXA
APPENDIX XI
APPENDIXX2
Maximum Limit of Chemical Elements .................................................................... 12
Tensile Requirements ........................................................................................... 12
Tolerances .......................................................................................................... 13
Dimensions of Long-Radius Elbows ...................... , ................................................. 14
Dimensions of 3R Elbows .................................................................................... 15
Dimensions of Straight Tees ................................................................................. 16
Dimensions of Reducing Outlet Tees ................... , ................................................ 17
Dimensions of Caps ............................................................................................ 20
Dimensions of Reducers ...................................................................................... 21
Recommended Bevel for Wall Thicknesses (t) at End of Fitting, 0.75 In. or Less .......... 9
Recommended Bevel for Wa1l Thicknesses (t) at End of Fitting, Greater Than 0.75 In ..... 9
Acceptable Design for Unequal Wall Thickness ...................................................... 1 0
Transverse-Face and Root-Bend Test Specimens .................................................... 10
Guided-Bend Test Jig ............................................................................................ 11
Referenced Standards and Applicable Dates .......................................................... 23
Supplementary Requirements ............................................................................... 24
Longitudinal-Bead Underbead Cracking Test. ...................................................... 26

 

 

SPECIFICATION FOR HIGH-TEST, WROUGHT, BUTT-WELDING FITTINGS
1. SCOPE
1.1 This specification covers factory-made, seamless and electric fusion-welded carbon and low-alloy
steel, butt-welding fittings for use in high pressure gas and oil transmission and distribution systems,
including pipelines, compressor statjons~ metering and regulating stations, and mains.

1.2 This Standard Practice governs dimensions, tolerances, ratings, testing, materials, chemical and
tensile properties, heat treatment, notch toughness properties, manufacture and marking for high-test,
butt-welding fittings NPS 60 and smaller. Dimensional requirements for NPS 14 and smaller are provided
by reference to ASME B 16.9.

1.3 The term "welding fittings" applies to buttwelding fittings such as elbows, segments of elbows,
return bends, caps, tees, single-or multiple-outlet extruded headers, reducers, and factory-welded extensions
and transition sections.(l)

1.4 Fittings may be made to special dimensions, sizes, shapes, and tolerances, or of wrought materials
other than those covered by this Standard Practice by agreement between the manufacturer and the purchaser. When such fittings meet all other stipulations of this Standard Practice they shall be considered as being in partial compliance therewith, providing they are appropriately marked.

1.4.1 Fittings manufactured in partial compliance, as provided in Section 1.4, shall be identified with
"Part" following the respective grade designation.

2. PRESSURE RATING
2.1 The allowable internal-pressure ratings for pipe fittings designed in accordance with this Standard
Practice shall be calculated as for straight seamless pipe (or welded pipe with a joint efficiency factor of
(I)Le ngt hs o fexte'nslO ns and tranSI.t.lo ns as agreed upon by purchaser and manufacturer.

1.0) of equivalent grade, diameter and wall thickness in accordance with the rules established
in the applicable sections of ASME B31.

2.2 All fittings produced in accordance with this Standard Practice shall be designed to withstand a
field hydrostatic test pressure, after installation, at a pressure level equivalent to that required to develop
a hoop stress equal to the specified-minimum yield strength for pipe ofequivalcnt grade and wall thickness
based on Barlow's Formula, without failure, leakage, or impairment of serviceability. Barlow's
formula is defined as: p = 2St D Where: P is the internal design pressure, psig; S is the specified minimum yield strength of the pipe,  psi; t is the nominal wall thickness ofthe pipe, in inches; D is the outside diameter of the pipe, in inches.

2.3 By agreement between the manufacturer and the purchaser, fittings may be tested at a higher pressure
providing the manufacturer is notified of the test pressure to be used.

2.4 The design shall take into consideration performance  requirements prescribed above as well as
additional factors dictated by the shape of the part.

2.5 The design of fittings may be established by mathematical analyses contained in nationally recognized
pressure vessel or piping codes or, at the manufacturer's option, by proof testing in accordance
with Section 4. The design of fittings that cannot be qualified by mathematical analyses shall
be established by proof testing in accordance with  Section 4.

3. SIZE
3.1 The nominal size of the fittings refers to the nominal O.D. of the pipe to which it is attached.

4. DESIGN PROOF-TEST
4.1 Proof tests shall be made as set forth herein as evidence of the adequacy of the design references
in Section 2. Records of design or successful proof tests shall be available at the manufachlrer's facility
for inspection by the purchaser.

4.2 Unless otherwise agreed upon between manufacturer and purchaser, the only required proof test
is a bursting strength test.

4.2.1 Prototype fittings that are representative of production and selected for test shall be identified
as to material, grade, and lot, including heat treatment. They shall be inspected for dimensional compliance
to this Standard Practice.

4.2.2 Straight seamless or welded pipe sections, with a calculated burst strength at least as great as
that calculated for the fittings, shall be welded to each end of the fitting to be tested. Any internal
misalignment greater than 0.06 inch shall be reduced by taper boring at a slope not over a 1 to 3 ratio.
The length of pipe sections for closures shall be at least twice the pipe O.D.

4.2.2.1 Shorter lengths may be used as follows: 1) The assembly must withstand at least 105 per
cent of the proof-test pressure computed in Section 4.2.4.
2) Minimum length of pipe shall be one pipe O.D. for NPS 14 and smaller.
3) Minimum length of pipe shall be one-halfpipe O.D. for sizes larger than NPS 14.

4.2.2.2 Test fluid shall be water or other liquid used for hydrostatic testing.

4.2.3 Hydrostatic pressure shall be applied until the fitting ruptures. The actual test pressure prior to
rupture must at least equal the computed proof-test pressure. Alternately, the test is successful if the
assembly withstands, without rupture, 105 percent  of the computed proof-test pressure defined in Section

4.2.4.
4.2.4 Computed Proof-Test Pressure: P = 2 St which refers to the pipe which
D the fitting's marking identifies (see Section 8.1.1) and, where: P is the computed minimum proof-test pressure; psig S is the actual tensile strength of the test fitting material (determined on a specimen
representative of the test fitting); psi is the nominal pipe wall thickness; in inches
D is the specified outside diameter of pipe; in inches

4.3 A successful proof test on a prototype fitting selected as required in Section 4.2.1 may be used to
qualify other fittings to the extent described herein
.
4.3.1 One test fitting may be used to qualify fittings of similar designs that are no smaller than onehalf
nor larger than two times the size of the test fitting.

4.3.2 The test of a non-reducing fitting qualifies reducing fittings that are of the same pattern.

4.3.3 The untested fitting must have a t / D ratio not less than one-half nor more than three times the
t / D of the test fitting.

4.3.4 The pressure retaining capacity of a fitting made of various grades of steel will be essentially
directly proportional to the tensile properties of the various grades .. Hence, it is necessary to test a prototype
in only a single grade to prove the geometric design of the fitting.

4.3.5 A test on a prototype elbow qualifies elbows having longer radii than the test fitting providing
they qualify under Sections 4.3.1 and 4.3.3.

5. HYDROSTATIC TESTING
5.1 Welding fittings shall be capable of withstanding a hydrostatic test-pressure as specified in Section
2.2, but hydrostatic testing by the manufachlrer is not required.

6. MATERIALS
6.1 The steel shall be fully killed and made using recognized melting practices to provide intended
heat-treat response and notch-toughness properties. Steel shall be made by open hearth, basic oxygen,
or electric furnace process and shall be suitable for field welding to other fittings, flanges, and pipe
manufactured under the following specifications: ASTMA53,A 106,A381,A234,A420,A 105,A
694, or the corresponding ASME standard, or API 5L, and :MSS SP-44.

6.2 The material for fittings shall consist of blooms, billets, slabs, forging quality bar, plate,
seamless or fusion-welded tubular products with filler metal added.

6.3 The steel used shall be suitable welding-quality carbon steels or of a suitable welding-quality
high-strength, low-alloy steel.

6.4 If preheating of the material is required to insure proper weldability under normal field conditions,
the manufacturer shall state specific preheat requirements and permanently indicate this on the
fitting.

7. CHEMICAL COIV[POSITION
7.1 The determination of the chemical composition of the steel used in meeting the requirements of
Table 1 shall be the responsibility of the manufachIrer  
7.2 The choice and use of alloying elements for fittings made from high-strength, low-alloy steels
to give the tensile properties prescribed in Table 2 shall be made by the manufacturer and included and
reported to identify the type of steel.

7.3 Carbon equivalent shall be computed by the following equation:
C.E. = C + Mn + Cr + Mo + V + Ni + Cu 6 5 15 and shall not exceed 0.45%.

8. TENSILE PROPERTIES
8.1 Tensile properties shall meet the requirements as specified in Table 2.
8.1.1 A fitting may have thickness or yield strength or both unequal to the pipe with which it is intended
to be used, provided the welding-end preparation at the joint assures wall thickness of the fitting is at
least equal to the specified pipe-wall thickness times the ratio of the specified minimum yield strength of
the pipe and the minimum-tested yield strength of the fitting (see Figures 3(a), (b), and (c) for joint
preparation ).

8.2 Tensile properties shall be determined in accordance with ASTM A 370.

8.3 Test specimens shall be taken from the fitting after final heat treatment or from a piece of pipe or
plate of the same nominal thickness, same heat of steel from which the fitting is made, and which has
been heat treated in a lot with any of the fitting(s) it represents (see Section 8.5).
8.4 Test specimens shall be in accordance with ASTM A 370 using full-size specimens or largest
sub-size specimens allowable. Yield strength shall be detennined either by the 0.2% offset or the 0.5%
extension under load (EUL) method.

8.S One tension test to detennine yield strength,b tensile strength, and percent elongation in 2 in. shall
be made from each lot of fittings. A lot shall consist of all fittings from the same heat of material of the
same starting wall thickness, given the same heat treatment in a fUll1ace controlled within a range of
SooF. The adequacy of the fUll1aCe to achieve and maintain temperature uniformity shall be established
by annual survey. Alternatively, thermocouples may be attached to a fitting in the lot or to a thennally
equivalent mass of material in contact with a fitting in the lot. Thennocouples and other temperature
measuring recording devices shall be calibrated quarterly.

8.6 When requested, fittings containing welds shall have one across the weld tension test made with the
axis transverse to the weld seam for each heat of filler metal, or each heat of filler metal and batch of
flux for submerged arc welds, and for a given heat treatment. Only the ultimate tensile strength need
meet the minimum requirements of Table 2 (see Appendix Xlc).

8.7 If the tension-test specimen from any lot fails to conform to the requirements for the particular
grade ordered, the manufacturer may elect to make retests on two additional pieces from the same lot, each of which shall confonl1 to the requirements specified in Table 2. If one or both of the retests fail to confonn to the requirements, the manufacturer may elect to test each of the remaining pieces in the lot. Retests are required only for the particular test with which the specimen did not comply originally.

8.8 It shall be permissible to cold flatten test specimens.

9. HEAT TREATMENT
9.1 All fittings shall be furnished in the heat treated condition. Hot formed fittings shall be cooled below
the lower critical temperature prior to heat treatment. Fittings shall be heat treated by one or more
of the following procedures:

9.1.1 Stress Relieving Stress relieving shall be limited only to guide-bar welds or fabrication welds
such as pup extensions, etc., unless otherwise agreed upon betvveen the mamf[acturer and the purchaser.
Fittings shall be heated to a suitable temperature below the transformation range, but not less than
1 OOOoF, holding at temperature for not less than one hour per inch of maximum thickness, but never less
than one-half hour and cooling in the furnace or in  air.

9.1.2 lVormalizing Fittings shall be uniformly reheated above the transformation range (austenite
range), held at this temperature a sufficient time to achieve uniform temperature throughout the mass
and cooled in air.

9.1.3 Normalizing & Tempering Fittings shall be normalized in accordance with Section
9.1.2. They shall then be tempered by reheating to a temperature below the transformation range, but not less than
1000oP, held at temperature for a minimum of one hour per inch of maximum thickness, but not less
than one-half hour and cooled in the furnace or in aIr.

9.1.4 Quenching & Tempering Fittings shall be unifonnly reheated above the transfonnation range,
held at temperature sufficient to achieve unifonn temperature throughout the mass and immediately
immersion quenched in a suitable liquid medium They shall then be reheated and tempered per Section.

9.1.3. Quenching facilities shall be of sufficient size and equipped to assure proper and uniform
cooling.

]0. TRANSVERSE GUIDED-WELD

BEND-TESTS
10.1 Transverse guided-weld bend-tests shall be performed only when specified on the order (see Appendix Xl b).

10.2 Transverse-weld test specimens shall be subjected to face and root-guided bend-tests. The specimens
shall be approximately 1.5 in. wide, at least 6 in. long with the weld at the center and shall be machined in accordance with Figure 4. The face-bend specimen shall be bent with the inside surface of the pipe against the plunger and the root-bend specimen with the outside surface against the plunger. The dimensions of the plunger for the bending jig shall be in accordance with Figure 5 and the other dimensions shall be substantially as shown in Figure 5.

10.3 The bend-test shall be acceptable if no cracks or other defects exceeding 0.12 in. in any direction
are present in the weld metal or between the weld metal and the fitting metal after the bending. Cracks
that originate along the edges of the specimen during testing and that are less than 0.25 in. measured in
any direction, shall not be considered unless obvious defects are observed.

10.4 Two weld-bend test specimens, as described in Section 10.2, shall be cut from a specimen from
each lot. The specimens may be taken from a fitting or from sample plates as described in Section 8.3.

10.5 If either test fails to confonn to specified requirements, the manufacturer may elect to make retests
on two additional specimens from the same lot, each of which shall conform to the requirements
specified in Section 10.3. If any of these specimens fail to confonl1 to the requirements, the manufacturer
may elect to test prolongations from each of the remaining fittings in the lot.

10.6 If the test results of any tests of a lot do not conform to the requirements specified above, retests
shall be made on additional fittings of double the original number from the same lot, each of which
shall conform to the requirements specified.

11. NOTCH-TOUGHNESS PROPERTIES
11.1 Notch-toughness properties shall be detennined with full size Charpy Type A-V notch specimens in accordance with ASTM A 370. Subsize specimens shall be used only when material to be tested is of insufficien t thickness. All specimens shall be taken with the axis of the specimen transverse to the direction of flow (of medium) and with the notch per- 5 pendicular to the surface. For plate, specimens may be taken transverse to the direction of rolling.

11.2 Specimens shall be taken from representative heats of steel used in manufacture of fittings or from
representative fittings, plates or pipe receiving the same heat treatment to determine the typical notchtoughness
properties of a given material.

11.3 From each heat of steel, one set (three specimens) shall be tested at 20°F or lower and show 20
ft. Ibs. minimum average. Percent shear shall be reported for infonnational purposes only.

11.4 Notch-toughness testing ofNPS 14 and smaller is not required unless grades WPHY 65 or higher
are supplied or the purchaser specifies testing.

12. FITTING DIlVlENSIONS
12.l One of the principles of this Standard Practice is the maintenance of a fixed position for the welding
ends with reference to the center line of the fittings or the overall dimensions, as the case may be.
Dimensional standards for fittings NPS 16 and larger are shown in Tables 3 through 9. Dimensional standards
and tolerances for NPS 14 and smaller sizes are contained in ASME B16.9.

13. TOLERANCES FOR WELDING FITTINGS
13.1 Tolerances The tolerances for fittings NPS 16 and larger are shown in Table 3 and are applicable to the nominal dimensions given in Tables 4 through 9 inclusive.

13.2 Wall Thickness The minimum wall thickness may be 0.01 in. under the nominal thickness, except that isolated non-continuous reductions are pennitted, provided the remaining wall thickness is not diminished to less than 93.5% of the specified nominal. This tolerance does not apply to areas where the proof test has indicated the need for reinforcement.

13.3 Welding Ends Unless otherwise specified, the details of the welding end preparation shall be in accordance with Figures 1 and 2. The root face  of the fitting shall be machined flat and shall not vary from the plane by more than 0.03 in. at any point. Where the wall of the fitting exceeds that of matching pipe, the transition shall be in accordance with the details given in Figure 3.

13.4 Angularity and Off Plane The ends of fittings shall be cut in accordance with the tolerances listed in Table 3.

14. MANUFACTURE
14.1 Fittings may be made by forging, hammering, pressing, piercing, rolling, extruding, upsetting,
welding, or by a combination of these operations  The forming procedure shall be so applied that it
will not produce injurious defects in the fittings.

14.1.1 Fabricated tees, elbows, and other fittings employing circumferential or intersection welds,
e.g., miter welds, are considered pipe fabrications, and are not within the scope of this Standard Practice.

14.2 When extensions or transitions are factory welded to the fittings by the manufacturer, they shall
be post-weld heat treated in accordance with the requirements of the ASME Boiler and Pressure Vessel
Code, Section VIII, Division 1 or heat treated in accordance with Section 9 of this Standard Practice.

14.3 All outlets NPS 2 and larger shall be of integral contour type and ends of outlets shall match the
joining pipe or fitting specified.

14.4 Welding Fabrication
14.4.1 Seam-welded pipe that is made in accordance with an ASTM or API specification shall comply
with the welding requirements of the applicable material specification. All other welds, including
those used in the Inanufacture of other pipe or cylinders, shall be made by welders, welding operators,
and welding procedures qualified in accordance with the provisions of Section IX of the ASME
Boiler and Pressure Vessel Code.

14.4.2 The joints shall be furnished in accordance with the requirements of Paragraph UW-35 (a) of
Section VIII, Division 1 of the AS ME Boiler and Pressure Vessel Code.

14.4.3 Machine welding shall be done by an electric process, preferably by submerged arc.

14.4.4 All butt welds shall have full penetration. Submerged-arc machine welding shall be done with
at least one pass from the inside, except when accessibility makes this impossible, then, a manual or
machine root-bead may be employed provided that a visual inspection ofthe root bead is possible. Backing
rings shall not be used. 14.4.5 Repair, chipping, or grinding of welds shall be done in such a manner as not to gouge, groove, or reduce the original metal thickness by more than 6-1/2% of nominal specified wall.

14.4.6 Fillet welds shall have a full throat and, unless otherwise specified, the legs shall be of approximately
equal length.

14.4.7 Welded-on braces, ifused, should be removed before heat treatment and the weld spot shall be repaired
and ground Hush and smooth. However, when braces are required for heat treatment, they shall be
cut out and the surface shall be ground flush and smooth after heat treatment. No welding shall be
permitted after heat treatment.

14.4.8 Weld metal used in the construction of fittings shall be suitable to meet the tensile-strength
and notch-toughness requirements of Sections 8 and 11 when heat treated in accordance with Section 9.

14.5 JYorkmallship and Finish
14.5.1 Fittings shall be free of injurious defects and shall have workmanlike finish.

14.5.2 Injurious defects are defined as those having a depth in excess of 6-1/2% of specified nominal wall.

14.5.3 Machining and grinding of surface defects shall be treated as follows: Sharp defects such as
notches, scratches, scabs, seams, laps, tears, or slivers not deeper than 6-112% of nominal wall thickness
shall be removed by grinding. Repair of in jurious defects by welding shall be permitted, except
that welding of injurious defects shall not be permitted when the depth of defect exceeds 33-1/3% of
the nominal wall thickness, or the length of repair exceeds 250/0 of the specified diameter. Defects must
be completely removed and welding performed by a welder qualified specifically for repair welding,
as per Section

14.4.1. Such repair welding shall be ground flush with the surface and all welding shall
be done before final heat treatment. Repair welding shall be done with low hydrogen electrodes, gasmetal-
arc process, or submerged-arc process.

15. NONDESTRUCTIVE EXAMINATION
15.1 Radiographic Examination All butt welds shall be radiographically examined in accordance
with Article 2 of ASME Section V using fine grain film and lead screens. Longitudinal weld seams shall  meet the acceptance standards in ASME Section VIII, Division 1. Girth welds shall meet the acceptance standards in Section 9 of API 1104.

15.2 Magnetic Particle or Ultrasonic Examination
Magnetic particle or ultrasonic examination shall be used for the examination of all fillet welds and all
other welds where it is impossible or impractical to use radiographic examination. Methods and acceptance
standards shall be by agreement between the manufacturer and purchaser.

15.3 AJagnetic Particle or Liquid Penetrant Examination
All butt-weld tees manufactured by coldforming methodes) shall be subjected to magnetic
particle or liquid penetrant examination. This examination shall be perfonned after tinal heat treatment.

7
Only the side wall area of the tees need be examined. This area is defined by a circle that covers the
area from the weld bevel of the branch outlet to the center line of the body or run. Internal and external
surfaces shall be examined, when size permits accessibility. No cracks shall be pennitted. Other imperfections
shall be treated in accordance with Section

14.5. Acceptable tees shall be marked with the symbol PT or MT, as applicable, to indicate compliance.
Nondestructive examination persomlel and procedures shall be qualified in accordance with ASME Section V.

16. INSPECTION
16.1 Inspector At all times while work on the contract of the purchaser is being perfonned, the inspector
representing the purchaser shall have free entry to all parts of the manufacturer's facilities that
involve the manufacture of the ordered fittings. All reasonable facilities shall be afforded the inspector
to satisfy the inspector that the product is being furnished in accordance with these specifications. All
tests and inspections called for by these specifications will be made in the manufacturer's plant prior
to shipment and at the manufacturer's expense unless otherwise specified and shall be so conducted
as not to interfere unnecessarily with the operations ofthe manufacturer's plant. The manufacturer shall
notify the purchaser prior to completion or shipment of all fittings requiring such inspection.

16.2 Certified lvlaterial Test Report (CMTR) When spccified on the purchase order, a Certified
I\1aterial Test Report shall be furnished listing the actual results of chemical analysis, Section 7; mechanical
properties, Section 8; notch-touglmess properties,
Section 11; heat treatment, Section 9; non-destructive examination, Section 15; and any special
tests required by the purchase order.

16.3 Rejection Each fitting in which injurious defects are found during shop or field fabrication may
be rejected, and the manufacturer shall be notified.
\
17. MARKING
17.1 All fittings furnished under this Standard Practice shall be clearly defined on the outside diameter
with the following information marked with lowstress die stamps or interrupted-dot stamps except as noted:

a) Manufacturer's name or trademark.
b) Nominal wall thickness of fittings at bevel ends.
c) Respective grade, yield and symbol as given in

Table 2.
NOTE 1. In the case of unequal yield strength, as in  Section 8.1. I, both grades of material shall be identified,
for example: Y60/X75.

NOTE 2. Y represents marking for fittings: X represents marking for pipe.
d) Heat code identity.
e) Size. (1)
17.2 In addition to the above, extruded headers shall also include the following infonnation:
a) Design pressure.
b) Temperature.
c) Per ASME B31.8.
Supplementary Infonnation
(1) At the option of the manufacturer, size may be paint
stenciled with 1 inch high letters in lieu of die stamping.

Origin

imports & stocks material from :

Europe, Japan, USA, South Africa, Korea, India, Germany, China, Taiwan, Turkey, Ukraine.

Supplementary Requiremnets

NACE MR0175, MR0103 / ISO 3183 / NACE TM0284, HIC & SSC TESTED PIPES, SOUR SERVICES, OFF SHORE SERVICES, WITH LOW SULPHUR <0.002%,

IMPACT TEST AT -50°C, BEAD CRUSH, 3 LAYER POLYETHYLENE COATING, 3 LAYER POLYPROPYLENE COATING, EPOXY COATING, RADIOGRAPHY (X RAY).

Delivery Condition

As Rolled, Normalized, Thermomechanical Rolled / Formed, Normalized & Tempered, Quenched & Tempered, Annealed, Stress Relieved.

Speciality

As Rolled, Normalized, Thermomechanical Rolled / Formed, Normalized & Tempered, Quenched & Tempered, Annealed, Stress Relieved.