1. GENERAL
·
Basis of Design 84506-60-00-2L-060
·
General Specification
84506-60-00-2L-000 - Definitions and Specification Directory
·
General Specification
84506-60-00-2L-010 - Quality Assurance / Quality Control
·
General Specification
84506-60-30-2L-250 - Specification Concrete Coating Application
·
General Specification
84506-60-30-2L-260 – Specification Asphalt Enamel Coating Export Pipeline
System
·
General Specification
84506-60-30-2L-420 - Offshore Pipelay
·
General Specification
84506-60-30-2L-620 – Specification FBE Infield Subsea System
·
API RP 5LW Recommended Practice for Marine Transportation of Linepipe
·
API RP 5LI Recommended Practice for Rail Transportation of Linepipe
1.1 Damage
caused to pipes while in the custody of CONTRACTOR shall be repaired in
accordance with the relevant Project Specification.
2. PIPE HANDLING
2.1 CONTRACTOR
shall handle all pipes efficiently and safely and prevent all damage
including: buckling or weakening the
pipe material, cracking, damaging or making pin holes in the anti-corrosion
coating, cracking or spalling of concrete weight coating, damage to bracelet
anodes or damage to pipe bevels.
2.2 Pipe
may be lifted using approved end hooks, straps or front loaders. If end hooks are used, they shall be made of
aluminum or other COMPANY-approved material.
If lifting straps are used they shall be wide and made of non-abrasive
material such as nylon webbing.
CONTRACTOR shall use a certified spreader bar to maintain the angle
between the pipe and the strap to greater than 60º. If front loaders are used, the forks shall be
lined with rubber or other COMPANY-approved material.
2.3 Coated
pipes shall be picked up clear of the ground without dragging and shall not be
subjected to impacts or jarring.
2.4 All
bolsters and supports shall be padded and have an adequate bearing surface
designed to give acceptable bearing loads on pipes and coatings. All chains, cables, or other equipment used
for fastening loads shall be carefully padded.
2.5
End bevel protectors shall be removed
prior to coating and re-installed after the final coating process is completed.
2.6
End bevel protectors shall not be
removed until the pipe joint is on the laybarge and being prepared for
installation.
3. REPAIR OF DAMAGED PIPES
3.2 CONTRACTOR
shall repair damage to:
·
Pipes strictly in accordance with
Project Specifications for Linepipe (84506-60-00-2L-210).
·
Anti-corrosion coating strictly in
accordance with Project Specification for Asphalt Enamel Coating
(84506-60-30-2L-260) and FBE (84506-60-30-2L-620).
·
Concrete weight coating in strict
accordance with Project Specification for Concrete Coating Application
(84506-60-30-2L-250).
3.3 Any
damaged pipes subsequently noted by CONTRACTOR shall be considered as being
damaged by CONTRACTOR, and these repairs to pipes, anti-corrosion coating or
concrete coating shall be borne by CONTRACTOR at their cost.
3.4 Cracks,
dents, distortions, flattening, inclusions, gouges, grooves, notches, laminations,
laps and other harmful defects to pipe joint ends shall be repaired or removed
as follows:
·
Cracks and notches shall be removed as
a cylinder and the pipe joint end rebeveled.
·
Bevels containing dents, gouges or
other depressions shall be repaired or rebeveled as directed by COMPANY.
·
Damaged root faces (lands) shall be
rebeveled if damage exceeds 0.8 mm over a maximum length of 19 mm or 1.2 mm
over a maximum length of 9.5 mm.
·
Damaged bevel surfaces, other than the
land shall be rebeveled if damage exceeds 2 mm in depth.
·
Minor bevel damage, not requiring
rebeveling, shall be smoothed with a file.
·
Indentations that affect pipe curvature
within 100 mm of a pipe joint end, or at a longitudinal or girth weld, shall be
removed by cutting out the damaged portion as a cylinder.
·
Arc burns shall be removed by cutting
and the damaged portion as a cylinder.
·
Damage that reduces the pipe internal
diameter by more than 95% of the nominal diameter shall be removed by cutting
out as a cylinder.
3.5 If
a cylinder of pipe is cut from the end of a joint, the new end shall be
ultrasonically inspected, circumferentially, for a distance of 100 mm from the
pipe end to detect any laminations or inclusion defects. If any laminations or inclusions are detected
then the pipe shall be cut back further and re-inspected.
3.6 If
the length of cut-off cylinder exceeds 150 mm, removal of some anti-corrosion
coating and concrete may be required.
This shall be performed in a manner preventing damage to the pipe.
3.7 Pipe
identification numbers shall be preserved during repair and due allowance for
cut-off lengths shall be in the tally of pipes and pipe lengths welded into the
pipeline.
3.8 Pipe
identification numbers shall be maintained using a stencil and paint on both
sections of pipe in the event of any cutting.
Each offcut shall be suffixed in order to prevent two pipes having the
same number.
3.9 A
detailed report of the pipe end cut and ultrasonic examination shall be
submitted to COMPANY to allow updating of the linepipe data records.
4. PIPE STORAGE
4.1 CONTRACTOR
shall separate and store pipes as they are unloaded by diameter, wall
thickness, material grade, manufacturer, thickness and type of coating (if
applicable). Pipes containing bracelet
anodes or buckle arrestors shall be stored on the top layer of a stack only.
Bends and pipes anti-corrosion coated but not concrete coated, shall not be
stacked, and shall be positioned so that there is no contact between adjacent
pipes.
4.2 CONTRACTOR pipe handling procedures shall
define distinct color band(s) to identify pipe of different size, wall
thickness, material grade, concrete thickness, and density.
4.3 CONTRACTOR shall provide calculations of
proposed pipe joint stacking height and support systems, for COMPANY approval,
showing that no pipe joint is loaded beyond allowable stress limits given in
Project Specification for Offshore Pipelay (84506-60-30-2L-420), and that
coatings shall not be damaged by stacking.
A dynamic load factor of 1.25 shall be used for transported pipe
stacking calculations. Calculations
shall be provided with CONTRACTOR pipe handling procedures.
4.4 Pipe racks shall prevent standing water
from contaminating pipe joint interior or exterior surfaces, and shall allow
water to drain from each pipe joint.
4.5 Pipe racks shall elevate the pipe to a
minimum of 0.5 meters off ground and shall be covered with wood or polyethylene
sheets.
5. PIPE TRANSPORTATION
5.1 CONTRACTOR
shall transport pipes using the best industry practices for land and marine
transport, and shall meet the appropriate following requirements:
·
API RP 5L1 - Recommended Practice for
Railroad Transportation of Linepipe.
·
API RP 5LW - Recommended Practice for
Marine Transportation of Linepipe.
5.2 Skids
or Padding shall be used to protect pipes laid on a truck, train flatbed or
cargo barge deck. Chains, cables
strapping, stanchions or other materials or equipment used during
transportation, for securing pipes, shall be padded.
5.3 All
pipe seafastening on a cargo barge shall be inspected and certified by a third
party inspection agency, and documentation provided to COMPANY prior to
departure. A Licensed Marine Surveyor
shall also approve marine equipment and procedures.
5.4 Pipes
shall not be exposed to salt water or salt-water spray during transportation.
6. SURPLUS PIPE
CONTRACTOR shall transport and unload all surplus pipes,
from onshore or offshore works, to a location mutually agreed by COMPANY and
CONTRACTOR.
7. DOCUMENT SUBMITTALS
7.1 CONTRACTOR
shall prepare for COMPANY approval, the following documents:
a. Description
of Pipe Handling Equipment
b. Pipe
Joint Stacking Procedures and Calculations (yard & transported pipe)
c. Pipe
Handling Procedures
d. Pipe
Repair Procedures
e. Coating
Repair Procedures
f. Pipe
Inspection Procedures
7.2 CONTRACTOR
shall provide COMPANY with the following documents as a minimum upon completion
of the Work.
a. Pipe
reconciliation tables
b. Pipe
inspection records
c. Pipe
repair records
d. Coating
repair records
e. Pipe
tally records
7.3
All certificates shall be in the English
language and use metric units of measure.
CONTRACTOR and COMPANY shall visibly sign certificates.
7.4 All data
will be submitted to the COMPANY in both hard copy and electronic format.