SPECIFICATION FOR PIPING CONSTRUCTION

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SPECIFICATION FOR PIPING CONSTRUCTION Powered By Docstoc
					   PREPARED
                      NA
      BY                                               PTT PUBLIC COMPANY LIMITED
   CHECKED
      BY                                               ONSHORE COMPRESSOR STATION 4
                                                       PROJECT
   APPROVED
       BY
    CERTIFIED
                      NA
      (PTT)
REV.      DATE      REVISED   APPROVED                        DESCRIPTION
NO.                   BY         BY
 D1     18-Feb-08                         ISSUED FOR ITB
 D2     11-Jun-08                         ISSUED FOR ITB




                              SPECIFICATION FOR

                           PIPING CONSTRUCTION

                           SPC-0804.02-96.51 REV.D2
                                      TOTAL 15 PAGES




                                                                .
                        AREA CODE OF SITE LOCATION

                                   GENERAL AREA: 010
                        PTT PLC. CONTRACT NO.                   PTT PLC. PROJECT NO.

                                                                            0804.02
                                                                               SPC-0804.02-96.51
PIPING                         PTT PUBLIC COMPANY LIMITED                      PAGE: 2 OF 15
CONSTRUCTION                    ENGINEERING SPECIFICATION                      REV: D2



                                                CONTENTS

SECTION

1.0    GENERAL ................................................................................................ 3

2.0    EXECUTION OF PIPING CONSTRUCTION WORKS......................................... 4

3.0    INSPECTION .......................................................................................... 12

4.0    CLEANING OF PIPING ............................................................................. 12

5.0    HYDROSTATIC AND PNEUMATIC TESTS OF PIPING .................................. 12

APPENDIX I. WELDING DETAIL FOR BRANCH CONNECTION ................................ 13

APPENDIX II. WELDING DETAIL FOR OUTLET AND HALF COUPLING JOINT ........... 14

APPENDIX III. WELDING DETAIL FOR FLANGE .................................................... 15
                                                                   SPC-0804.02-96.51
PIPING                   PTT PUBLIC COMPANY LIMITED                PAGE: 3 OF 15
CONSTRUCTION              ENGINEERING SPECIFICATION                REV: D2

1.0   GENERAL

1.1   Intent
      This specification specifies, procedure and acceptance criteria of aboveground
      piping works to perform required quality level.


1.2   Scope
      This specification covers the general requirements in the piping construction
      works or the plant constructed by CONTRACTOR. (hereinafter referred to as
      CONTRACTOR.)


1.3   References
      Standards and CONTRACTOR References Piping Construction works shall be in
      accordance with ASME B31.3 and ASME SEC.IX, unless otherwise specified.


1.3.1 Standards
      (1)      ASME B31.3 "Process Piping"
      (2)      ASME    SEC.IX   "Qualification   Standard    for    Welding   and   Brazing
               Procedures, Welders, Brazers, and Welding and Brazing Operators"


1.3.2 References
      (1)      SPC-0804.02-50.01           Design Instruction for Piping Arrangement
      (2)      SPC-0804.02-50.02           Piping Material
      (3)      SPC-0804.02-50.04           Underground Piping Work
      (4)      SPC-0804.02-50.05           Piping Layout
      (5)      SPC-0804.02-50.06           Fabrication Inspection and Testing of Piping
      (6)      SPC-0804.02-93.06           Painting
      (7)      SPC-0804.02-92.08           Positive Material Identification
                                           Requirements
      (8)      SPC-0804.02-50.02           Engineering Specification Piping Materials
      (9)      SPC-0804.02-96.54           Welding Procedure Specification for
                                           U/G Pipe & A/G Pipe
      (10)     SPC-0804.02-96.58           Hydrostatic Pressure Testing of Piping
      (11)     SPC-0804.02-96.59           Pneumatic Test


1.4   Units
      Unless otherwise specified, metric, Celsius and kilogram units shall be applied
      as the measurement system for the drawings and documents to be submitted.
      However, nominal sizes of piping components shall be in accordance with inch
      system, which abbreviation is (B).
                                                              SPC-0804.02-96.51
PIPING                      PTT PUBLIC COMPANY LIMITED        PAGE: 4 OF 15
CONSTRUCTION                 ENGINEERING SPECIFICATION        REV: D2

2.0   EXECUTION OF PIPING CONSTRUCTION WORKS

2.1   General Drawings and Reference for Works


2.1.1 Piping construction works shall be constructed as following drawings.
      (1)      Plot Plan
      (2)      Piping Arrangement Drawings (plan and elevation)
      (3)      ISO drawing
      (4)      Pipe Hanging Details
      (5)      Detail drawings of steam trap, sampling cooler and its assembly
      (6)      Instrument Process Piping Hook-up Drawings
      (7)      Notes for Piping Drawings
      (8)      Line Schedule
      (9)      Others, if necessary.


2.2     Standards for Execution of Works


2.2.1 Piping materials used for construction works, the method of piping joints
      described in piping arrangement drawings and piping fittings shall be in
      accordance with "Engineering Specification Piping Materials (SPC-0804.02-
      50.02)"
2.2.2 In a piping connecting to equipment's having different class designation, the
      higher class shall be applied up to the shut-off valve including the shut-off
      valve. If a check valve is installed at down-stream of the shut-off valve, the
      check valve shall also be of the higher class designation.
2.2.3 All tees shall be ones which are specified in the "Engineering Specification
      Piping    Materials    (SPC-0804.02-50.02)".   The   reinforcement   shall   be   in
      according to ASME B31.3 Para. 304. However, block tees shall always be as
      specified in the "Engineering Specification Piping Materials (SPC-0804.02-
      50.02)".
2.2.4 Gasket used for pressure test shall not be used again after completion of the
      test.
2.2.5 Contractors shall check the finished dimension of pipe racks against the piping
      Arrangement Drawings before mounting the piping.
2.2.6 Marking to identify piping materials in field shall be in accordance with
      "Marking for Piping Material (SPC-0804.02-50.92)", not to be used paint
      included zinc.
                                                                SPC-0804.02-96.51
PIPING                      PTT PUBLIC COMPANY LIMITED          PAGE: 5 OF 15
CONSTRUCTION                 ENGINEERING SPECIFICATION          REV: D2

2.3    Cutting


2.3.1 Pipes and fittings shall preferably be cut with cutting machine and beveled by
       machining, grinding, etc., according to the shapes described in "Engineering
       Specification Piping Materials (SPC-0804.02-50.02)".
2.3.2 Gas cutting, air cutting, or torch cutting for alloy steel shall be adopted for
       rough curing only. In this case, the cut part shall be made smoothly by
       grinding off at least 2mm.
2.3.3 Cutter blade of abrasive cutting machine for cutting austenitic stainless steels
       shall not be confused with that used for cutting carbon steels
2.3.4 Pipe cutter shall never be used for piping works. If it is inevitably used, the
       inner surface of pipe at cut-end shall be well finished by reamer or file.
2.3.5 Plasma jet cutting may be applied for stainless steel.
2.3.6 No openings such as branches shall be located to pass through a weld. Such
       openings shall have their boundaries at least one OD away from adjacent
       welds.
2.3.7 To ensure there is no carbon contamination of stainless steel pipe and fittings
       the following fabrication and erection equipment needs to designated and color
       coded consisting off but not limited to cutting equipment, clamps, jigs, hand
       tools. etc.
2.3.8 Transfer of heat numbers when cutting pipe and this is applied to Stainless
       Steel Pipe and Steel Pipe for Low Temperature Service only.


2.4    DELETED


2.5    Threading


2.5.1 Thread to be used for pipe shall be taper thread in accordance with
       "Engineering Specification Piping Materials (SPC-0804.02-50.02)"
2.5.2 Deleted
2.5.3 In case where pipes are seal-welded after screwed-in, lubricant, seal tape, etc.
       shall not be used.
2.5.4 Coupling's length of threaded connection shall be according to 2.5.1 and no
       thread shall be left outside after it was duly screwed-in.


2.6    Welding


2.6.1 Welding General
       (1)      Welders shall have the qualifications stipulated in ASME Section IX to
                cover the kind of materials concerned in the piping works. They also
                should be qualified in accordance with relevant specification.
                                                                 SPC-0804.02-96.51
PIPING                    PTT PUBLIC COMPANY LIMITED             PAGE: 6 OF 15
CONSTRUCTION               ENGINEERING SPECIFICATION             REV: D2

     (2)    Welding shall not be performed, as a rule, when the ambient
            temperature is below 5°C unless the pipe is preheated up to more than
            40°C.
     (3)    No welding shall be done if there is impingement of any rain, snow, sleet
            or high wind on the working area. However, welding may be done
            provided      that   wind    protection   is   installed   and   approved   by
            CONTRACTOR.
     (4)    Chamfer shall be cleaned and free from rust, oil, paint, sand, moisture
            and other material which is detrimental to welding.
     (5)    Weld bead shall be carefully laid to avoid undercut, pin hole, slag
            inclusion, crater, imperfect penetration, etc.
     (6)    Welding rods shall be properly selected according to the kind of the steel
            to be welded.
     (7)    Welding rods always should be stored as clean & drying condition.
     (8)    Grounding wire shall be firmly fastened by screw or clamp to the
            material to be welded, at the position as near as possible to the welded
            part.
     (9)    Inside of circumferential weld bead shall not have any burr or fragment
            of welding rod and all adhering substances shall be removed as far as
            possible.
     (10)   Spatter, slag, etc. of welded parts shall be thoroughly removed down to
            the metal surface.
     (11)   Provide jigs (bridges or clamps) in minimum number necessary for
            setting up.
     (12)   Remove the jigs by grinder or gas cutting and, in case of gas cutting, cut
            it at upper part of its weld toe and finish by grinder down to the surface
            of base metal. Jigs shall never be struck down by hammer or plucked
            off.
     (13)   Use jigs (bridges or clamps) made of material whose quality is the same
            as or better than the base metal.
     (14)   When bridge or clamp is to be welded on the following materials shall be
            strictly and carefully observed.
            (1)     High tensile strength steel
            (2)     High carbon steel Aluminum killed steel
            (3)     Low alloy steel
            (4)     High alloy steel
     (15)   Keep correct root openings by using spacer, etc.
     (16)   In a tack welding, select welding rod of appropriate diameter for a tack
            welding so as to fit the root opening.
     (17)   Circumferential butt joint welding shall be performed without using
            backing ring in principle.
                                                              SPC-0804.02-96.51
PIPING                   PTT PUBLIC COMPANY LIMITED           PAGE: 7 OF 15
CONSTRUCTION              ENGINEERING SPECIFICATION           REV: D2

      (18)   As a rule, no backing ring shall be used for circumferential butt-welding
             of piping components.
      (19)   In the case of butt welding of piping materials having different
             thickness, the end of the piping materials shall be worked so that the
             difference of diameter conies within 1.6mm at inner surface, unless
             otherwise specified.
      (20)   Before welding first layer, both ends of tack weld bead shall be
             sharpened with grinder as shown in the following figures in order to
             allow complete fusion.
      (21)   The first layer of the welding bead shall have complete penetration,
             welding electrode (root pass welding rod) or GTAW method being used,
             except for the case where both sides welding is adopted, and pipe
             diameter is over 500mm. Deposit welding shall be welded after grinding
             or removing inside welding bead with gauge.
      (22)   Weld bead of austenitic stainless steel shall be acid cleaned except for
             the part where heat or cold insulation is applied.
      (23)   It is not permitted to tack-weld the shoe on pipe rack, where the shoe is
             not to be fixed to the pipe rack.
      (24)   Straightening of pipe by application of heat or otherwise is not
             permissible, (I.e. no diamond heat, no TIG washing, no weld gouging)
      (25)   If reinforcement pads for branches should be made from two segments,
             the segments shall be welded in location away from the main pipe and
             the weld shall not run parallel to the main pipe's axis.


2.6.2 Welding for pipe
      (1)    Shape of butt welding shall be in accordance with "Engineering
             Specification Piping Materials (SPC-0804.02-50.02)" root opening be in
             accordance with standards mentioned in WPS (Welding Procedure
             Specifications), in the case of within 1/2 times the thickness of pipe.
             root opening shall be applied 1.0-2.0mm for plain end, 2.4-4.0mm for
             bevel end, unless otherwise specified.
      (2)    In the case of butt welding of piping materials having different
             thickness, the welding of the piping materials shall be worked so that
             thicker side thickness should be accordance with thinner one.
             In the case that the difference of inside surface is more than 1.6mm,
             thicker surface shall be finished as ASME B31.3 Figure 328.4.3
             Trimming and Permitted Misalignment.
      (3)    When welded pipe is used in horizontal line, the pipe shall be laid so that
             the longitudinal weld line comes to the top of the pipe. The welding
             detail for main line, branch line and support shall be in accordance with
             Appendix IV.
                                                              SPC-0804.02-96.51
PIPING                   PTT PUBLIC COMPANY LIMITED           PAGE: 8 OF 15
CONSTRUCTION              ENGINEERING SPECIFICATION           REV: D2

2.6.3 Welding for Branch Connection
       (1)    Brach connection shall be made using tee specified in "Engineering
              Specification Piping Materials (SPC-0804.02-50.02)". When the branch
              pipe is welded directly to main pipe, unless otherwise specified, welding
              shall be performed as shown in Appendix I.
       (2)    When outlet joint and half coupling joint (incl. Boss connection) are
              welded directly to main pipe, welding method shall be in accordance
              with Appendix II, unless otherwise specified in any drawings and
              references.


2.6.4 Welding for Flange
       The welding of flange and pipe shall be in accordance with Appendix Ill, unless
       otherwise specified in any drawings and references.


2.6.5 Filler Materials and Fluxes
       All filler metals and fluxes shall be in accordance with ASME Section II, Part C,
       since various national specifications for welding consumables are not freely
       interchangeable, equivalence to ASME / AWS Specifications shall be indicated.
       Equivalence may be determined by review of consumables (electrodes and
       fluxes) and manufacturer's catalogues and/or by chemical analysis and
       mechanical testing of deposits.


       (1)   Dissimilar weldings shall be made using consumables as follows:
              1)     Welds between ferritic and austenitic stainless steels
                     AISI type 309, provides that the process operating temperature is
                     below 310 ۫C
                     High nickel consumables; eg. Inconel 82 (AWS A5.14 ERNiCr-3),
                     Inconel 182 (AWS A5.11 EniCrFe-3) or Incoweld A (AWS A5.11
                     EniCrFe-2) shall be used for process operating temperatures in
                     excess of 310 ۫C, except that AWS A5.14 ERNiCrFe-6 shall not
                     be used.


              2)     Welds between carbon steel and Cr-Mo Steels
                     AWS A5.28 ER80S-XX, ER90S-XX for bare electrodes
                     AWS A5.5 E80XX-XX, E90XX-XX for covered electrodes


       (2)    Covered welding electrodes for fabrication of ferrous piping shall be in
              accordance with the follow;
                                                               SPC-0804.02-96.51
PIPING                  PTT PUBLIC COMPANY LIMITED             PAGE: 9 OF 15
CONSTRUCTION             ENGINEERING SPECIFICATION             REV: D2

          Material       Welding Material Specification    AWS Classification
          Carbon Steel            AWS A-5.1, ASME SFA-5.1               E70XX
          A333 Gr. 6 &            AWS A-5.5, ASME SFA-5.5           E7016G/E7018G
          equivalents
          1%Cr-1/2%Mo             AWS A-5.5, ASME SFA-5.5               E80XX-B2
          1-1/4%Cr-1/2%Mo         AWS A-5.5, ASME SFA-5.5               E80XX-B2
          2-1/4%Cr-1%Mo           AWS A-5.5, ASME SFA-5.5               E90XX-B3
          3%Cr-1%Mo               AWS A-5.5, ASME SFA-5.5               E90XX-B3
          5%Cr-1 /2%Mo            AWS A-5.5, ASME SFA-5.5               E80XX-B6
          9%Cr-l%Mo               AWS A-5.5, ASME SFA-5.5               E80XX-B8
          Type 304                AWS A-5.4, ASME SFA-5.4               E308 XX
          Type 304H               AWS A-5.4, ASME SFA-5.4               E308H XX
          Type 304L               AWS A-5.4, ASME SFA-5.4               E308L XX
          Type 309                AWS A-5.4, ASME SFA-5.4               E309 XX
          Type 310                AWS A-5.4, ASME SFA-5.4               E310 XX
          Type 316                AWS A-5.4, ASME SFA-5.4               E316 XX
          Type 316L               AWS A-5.4, ASME SFA-5.4               E316L XX
          Type 316H               AWS A-5.4, ASME SFA-5.4               E316H XX
          Type 321 or 321H        AWS A-5.4, ASME SFA-5.4               E347 XX
          Type 347 or 347H        AWS A-5.4, ASME SFA-5.4               E347 XX


               * Electrode coatings designated XX above may be 15, 16 or 18


          Bare welding electrode (for inert gas and submerged are welding) for
          fabrication of ferrous piping shall be in accordance with the following;

          Material        Welding Material Specification     AWS Classification
          Carbon Steel            AWS A-5.18, ASME SFA-5.18             ER70S-X
          A333 Gr. 6 &            AWS A-5.28, ASME SFA-5.28           TGS-1 N (Kobelco)
          equivalent
          1%Cr-1/2%Mo             AWS A-5.28, ASME SFA-5.28             ER80S-B2
          1-1/4%Cr-1/2%Mo         AWS A-5.28, ASME SFA-5.28             ER80S-B2
          2-1/4%Cr-1 %Mo          AWS A-5.28, ASME SFA-5.28             ER90S-B3
          3%Cr-1 %Mo              AWS A-5.28, ASME SFA-5.28             ER90S-B3
          5%Cr-1/2%Mo             AWS A-5.28, ASME SFA-5.28             ER80S-B6
          9%/oCr-1%Mo             AWS A-5.28, ASME SFA-5.28             ER80S-B8
          Type 304                AWS A-5.9, ASME SFA-5.9               ER308
          Type 304H               AWS A-5.9, ASME SFA-5.9               ER308H
          Type 304L               AWS A-5.9, ASME SFA-5.9               ER308L
          Type 309                AWS A-5.9, ASME SFA-5.9               ER309
          Type 310                AWS A-5.9, ASME SFA-5.9               ER310
          Type 316                AWS A-5.9, ASME SFA-5.9               ER316
          Type 316L               AWS A-5.9, ASME SFA-5.9               ER316L
          Type 316H               AWS A-5.9, ASME SFA-5.9               ER316H
                                                                SPC-0804.02-96.51
PIPING                    PTT PUBLIC COMPANY LIMITED            PAGE: 10 OF 15
CONSTRUCTION               ENGINEERING SPECIFICATION            REV: D2

              Type 321 or 321H        AWS A-5.9, ASME SFA-5.9           ER347
              Type 347 or 347H        AWS A-5.9, ASME SFA-5.9           E347 XX


2.7    Heat Treatment


2.7.1 Materials and temperature for preheat treatment and stress relieving shall be in
       accordance with ANSI/ASME B 31.3 Table 330.1.1 and Table 331.1.1
2.7.2 Preheating shall be performed by propane flame or by other appropriate method
       prior to connecting the weld.
2.7.3 Heating width at preheating shall be more than 25mm to each from bevel end.
2.7.4 Welding works shall not be interrupted as a rule. If interruption in inevitable,
       means to avoid sudden cooling shall be taken and reheating shall be done
       before starting weld again. (ex: asbestos mat)
2.7.5 Heat treatment to be performed at the field shall be local heat treatment
2.7.6 In case where heat treatment is used for local, this shall be done as follows.
       (1)    Around the heating coil, insulation of standard shape without damage or
               other abnormality shall be provided.
       (2)    The chart of automatic temperature recorder shall be submitted as
              temperature record.
       (3)    In the process of cooling down after the heat treatment air cooling shall
              be done after the temperature of the pipe became 300°C or below.
       (4)    The pipe shall not be contacted with other kinds of metal during heating.
       (5)    Any scale on inner and outer surface of pipe after heating shall be
              completely removed. Especially, flange surfaces shall be completely
              cleaned.


2.8    Fabrication and Installation


2.8.1 Fabrication of piping shall be worked in accordance with 2.1 - 2.5
2.8.2 Fabrication of piping shall be considered to transportation installation.
2.8.3 Sufficient protecting means shall be taken not to allow sand or other foreign
       matters go into inside of pipes and other piping materials.
2.8.4 On the inner surface and then both ends shall be sealed with suitable caps.
2.8.5 Assembly of piping components shall be performed after it is confirmed that all
       piping components are in accordance with drawings and Construction
       Specifications.
2.8.6 Each fabricated component of piping shall be cleaned by air or water for
       removing scale, oil, etc.
2.8.7 When installed piping components shall be considered not to be interrupted
       other facilities of works.
                                                                 SPC-0804.02-96.51
PIPING                     PTT PUBLIC COMPANY LIMITED            PAGE: 11 OF 15
CONSTRUCTION                ENGINEERING SPECIFICATION            REV: D2

2.8.8 Valves shall be installed as closed after cleaning, and shall not be opened during
         installation of piping systems.
2.8.9 If the inside of valve has any damage because of welding and heat treatment,
         valve should be disassembled and re-installed.
2.8.10      The piping components needed handling such as valves shall be considered
            to handle easily.
2.8.11      Flanged joints shall be fitted up, after checking for the alignment of flange
            center and parallels.
2.8.12      In threaded joint between pipe and flange, the length of thread on the pipe
            shall be that the end of the pipe comes short to reach flange's gasket by
            1.5 to 3.0mm who screwed-in. Otherwise shorten the length of thread in
            cutting off.
2.8.13      The bolt holes of flanges to be welded to pipes shall be located
            symmetrically from vertical center line in horizontal piping line, unless
            otherwise indicated in the drawing.
2.8.14      Seal welding of threaded parts shall be performed after the part is screwed-
            in completely without using paste or oil and fully cleaned with benzene,
            etc. and   dried out. Reinforcement of seal weld bead shall cover completely
            the remaining thread.
2.8.15      Piping works shall be accurately performed in checking horizontal and
            vertical directions and mutual distances between parallel lines, using level
            transit, plummet, etc.
2.8.16      When gaskets installed, torque acting on gasket should not give any
            damage to gaskets.
2.8.17      Opening such as flanged joints of pump, compressor, etc shall be kept
            covered    with thin metal plate or other blinds to prevent dust and/or
            foreign matters from entering into the machine until the piping is connected
            there.
2.8.18      If works using fire are to be performed in the vicinity of instrument control
            or power cable duct, an appropriate protection means shall be provided in
            advance, in order not to damage the cables.
2.8.19      When works are done in the vicinity of piping made of, or lined with special
            materials such as plastics, rubber, glass, etc:, care shall be taken not to give
            damage by fire, impact, etc.
2.8.20      Piping support works shall be performed in accordance with "Engineering
            Specification Piping Materials (SPC-0804.02-50.02)"
2.8.21      During pipe erection stainless steel piping shall be protected from cutting
            operations from adjacent carbon steel piping to ensure no carbon
            contamination.
                                                          SPC-0804.02-96.51
PIPING                  PTT PUBLIC COMPANY LIMITED        PAGE: 12 OF 15
CONSTRUCTION             ENGINEERING SPECIFICATION        REV: D2

3.0   INSPECTION

      Inspection for piping construction works shall be in accordance with
      "Fabrication Inspection and Testing of Piping (SPC-0804.02-50.06)" &
      Engineering Specification for Pressure Test (SPC-0804.02-96.52)



4.0   CLEANING OF PIPING

      Cleaning of piping shall be in accordance with "Work Procedure for Piping
      Cleaning & Flushing" (to be issued later)



5.0   HYDROSTATIC AND PNEUMATIC TESTS OF PIPING

      Hydrostatic and pneumatic tests of piping shall be in accordance with
      Fabrication Inspection and Testing of Piping (SPC-0804.02-50.06), Engineering
      Specification for Pressure Test (SPC-0804.02-96.52), Hydrostatic Pressure
      Testing of Piping (SPC-0804.02-96.58) and Pneumatic Test (SPC-0804.02-
      96.59).


      On concealed welds under reinforcing pads a pneumatic test on the reinforcing
      pads are required prior to do the hydro-test in accordance with Leak Test
      Procedure for Re-inforcing Pad (SES-PR.02-99-0201.10-3500-20).
                                                               SPC-0804.02-96.51
PIPING                  PTT PUBLIC COMPANY LIMITED             PAGE: 13 OF 15
CONSTRUCTION             ENGINEERING SPECIFICATION             REV: D2

Appendix I. Welding Detail for Branch Connection




  Remarks: 1.        the symbols used in these figures are as follows
                     t : nominal thickness of main wall
                     th : nominal thickness of branch wall less corrosion allowance.
                     to : nominal thickness of reinforcement
                     tc : nominal thickness of welding leg.
                2.   Where the reinforcement is necessary, it is indicated in
                     Engineering Specification Piping Materials (SPC-0804.02-50.02)


     NOTE * :        The fully penetrated groove welds with no imperfection shall be
                     obtained. (incl. Boss Connection)
                                                                 SPC-0804.02-96.51
PIPING                   PTT PUBLIC COMPANY LIMITED              PAGE: 14 OF 15
CONSTRUCTION              ENGINEERING SPECIFICATION              REV: D2

Appendix II. Welding Detail for Outlet and Half Coupling Joint

       (1) When branch pipe is 11/2" or smaller




       (2) When branch pipe is 2" or larger




  Remarks: The symbols used in these figures are as follows:
              T: Thickness of main pipe
              t : Thickness of branch pipe
                                                                  SPC-0804.02-96.51
PIPING                   PTT PUBLIC COMPANY LIMITED               PAGE: 15 OF 15
CONSTRUCTION              ENGINEERING SPECIFICATION               REV: D2

Appendix III. Welding Detail for Flange




  All front-end, irrespective of nominal pipe size, shall be fillet welded and finished
  with grinder or file to make flush with inside diameter.




  Remarks:


  1.    The symbols used in these figures are as follows :
              t : Thickness of pipe
              T : Thickness of Flange hub
  2.    If 1.4t is larger than T, T shall be in accordance with
  3.    Welding for welding Neck Flange shall be in accordance with the
        method of butt-welding.

				
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