PIPING FABRICATION PROCEDURE
PIPING FABRICATION
Pipe fabrication is the process of welding piping components such as pipes, elbows, tees, flanges, etc., into engineered piping systems in exact accordance with our customers' design requirements.
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| ACTIVE PIPING KNOWLEDGE |
- 1.
Piping Materials
- 2.
Dimensional Tolerance
- 3.
Pipe Joints
- 4.
But Welded and Socket
welded piping.
- 5.
Screw Piping
- 6.
Flange connection
- 7.
Branch Connection
- 8.
Miter Bend and
Fabricated Reducer
- 9.
Cutting And Trimming of
Standard Fittings & Pipe.
- 10. Galvanised Piping
- 11. Shop Fabrication.
1. Piping Materials:
·
All incoming materials
shall be inspected as per approved ITP
·
Pipe, Pipe Fittings,
Flange, Valve, Gasket, Stud Bolts etc all are check strictly as per PMS.
·
Materials Traceability
shall be maintained for A.S, S.S, NACE, LTCS & transferring heat number.
·
Must be Colour Coadding
for all piping materials as per procedure.
2.Dimensional
Tolerance:
·
Dimension tolerance for
piping fabrication shall be as per client standard. In order to adjust the
variation in Dimension shown in AFC drawings & actual site, “Field Weld”
shall be provided during fabrication.
·
Whenever error occur in
drawings and bill of materials it shall be supervisor responsibility to notify
the client.
3.Pipe Joints
·
Joining of line 2” and
above in process and utility piping shall be pererered by butt weld.
·
Joining of line 1-1/2”
and below shall be by socket welding/ Butt welding/ Threaded joints as
specified in piping materials specification.
4. But Welded and
Socket welded piping.
·
End preparation,
Alignments and Fit-up of piece to be welded, Welding, Pre-heating and heat
treatment (PWHT)shall be followed as describe in the welding specification
chart.
·
NDT specification as along
with tender documents
5.Screwed Piping
·
Galvanized Piping shall
have thread as per ANSI B2.1.
·
Pipe thread shall be
clean cut, without any burrs.
·
Threading of Pipe shall
be done after bending or Heat treatment Operation.
·
During assembly of
threaded joints, all threaded of pipe or fittings shall be cleaned.
·
The male threads shall
be coated with thread sealant and the joint tightened sufficiently for leak
proof joint.
6. Flange connection.
·
All Flange Facing shall
be true and perpendicular to the Axis of the pipe to which they are attached.
·
Clean pipe flange, without forcing to bear uniform bolt
tension and gasket compression & flange hole as per drawing.
·
Line item like orifice flanges, Spectacle blind, Strainer
etc. shall be installed Following proper orientation.
·
A flange connection for the equipment’s shall be check for
misassignment excessive gaps etc.
·
Extra care is to be exercised for flange connection to pump,
turbines, cold boxes, air cooler.
·
Whenever a sceptical
blind is to provided, Drilling and taping Jack screws in the flange shall be
done before welding.
7. Branch connection: -
·
Branch connection with
or without reinforcing pads shall be as indicates in the PMS.
·
For End preparation, Alignments,
spacing, fit-up and welding and any of branch connection client guideline to be
referred.
8. Cutting and Trimming
of Standard fittings & pipe.
·
Component like pipe,
elbow, Couplings, half couplings etc. shall be cut / trimmed edge preparation
whenever required to meet fabrication and erection requirements as per drawings
or as per client standard.
9. Shop Fabrication/
Prefabrication
·
The purpose of shop
fabrication or pre-fabrication is to minimise work during the Erection.
·
Piping spool after
fabrication stacked with proper identification marker on each spool.
·
During this period all
flange raise face and threaded need to be extra care and to avoid physical
damage also.
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