1.0 General Scope
This section deals with the procedures
relating to review and issue of construction drawings.
Each drawing issued for construction
shall be required to complete a review procedure prior to issue. In general the process shall involve.
1.Completion of
drawing
2.Drawing check by
Senior Draftsman
3.Design check by
Designer
4.Design Peer
Review by Senior Engineer
5.Approval for
Construction
This procedure is required to ensure
that the design documents and drawings conform with Engineering Standards,
and that adequate and correct information is supplied to ensure the project can
constructed and operated efficiently and safely.
All drawings leaving the design office
for fabrication and/or construction are to be checked for:
·
Plant design,
equipment arrangements, major equipment selection, flow diagrams, systems,
layouts and circuitry .This is generally the duty of supervision who, with the
assistance of senior personnel, check these aspects on a continuous basis from
the initial stages of design.
·
Stress design,
component arrangement and relationship, and adherence to applicable codes, etc.
This is normally done by senior design personnel appointed at the discretion of
the supervisor .
·
Dimensions, geometry, fabrication practice,
installation clearances, adherence to Drafting Standards, projection,
orientation, clarity of presentation, references, notes, drawing titles, key
plans, etc. This is done by any design/drafting personnel qualified and as the
need arises.
2.0 Checking Procedure
Upon completion of drawings, one print
of each drawing (A1, A2 or A3 – depending on complexity of the drawing) shall
be supplied to the Senior Draftsman for checking purposes. The "checker" shall use the
"red/yellow" method (yellow for correct, red for error}. All remarks
in red shall be clear and concise.
The checked drawings shall be returned
to the person who produced the original drawing for correction in accordance
with the checked print. All revisions
completed shall be "crossed out" on the check print with a green
marker.
On completion of the revisions, the
drawing originator shall supply the checker with a reprint the revised drawing
and the markup copy. The checker shall
review and ensure all revisions required have been transferred to the new
print. Any variance shall be resolved
between the drawing originator and the checker.
This process shall be repeated for the
Design check (completed by the Designer) and the Peer Review check (completed
by a Senior Engineer). Where necessary, appropriate personnel will be assigned
by the supervisor for the Peer Review role.
This process is detailed in the attached
flow chart.
3.0 Signatures and Approvals
Refer to the attached title block
example appended to this document.
3.1 New Drawings
When all items have been revised, the
initials of the persons that checked the drawing shall be included in the title
block. The Design Reviewer and the Peer
Reviewer shall indicate their satisfaction by counter initialing and dating the
appropriate line in the drawing title block.
The release of the drawing for
construction (RFC) approval shall be the responsibility of the Project Manager
(Capital Projects) or Superintendent of Engineering (Operating Projects). The RFC approval is indicated in the separate
approval box.
3.2
Revisions
Subsequent revisions of an original
drawing shall be processed in the same manner as a new drawing, except.
·
The review /
approval process shall only be required for "As-built" and
"Released for Construction" drawing issues. Intermediate drawing issues shall generally
not require the review process to be completed, however this should be assessed
on a case by case basis.
·
The review /
approval process shall only consider the area of the plan being revised. This should be indicated on all plans as a
"clouded" section and a corresponding revision # triangle.
·
As-built
drawings should be reviewed by the Commissioning Engineer to ensure the new
drawings reflect the installation.
4.0 Checking – Roles and
Responsibilites
Each check process involves a specific
role and accountability, as detailed below.
Drafting
Originator
Prior to submitting the drawing for
review, the drawing originator should verify the format and content by using a
standard checklist developed for Civil / Mechanical drawings and
Instrumentation / Electrical drawings.
These checklists are attached as an Appendix to this document.
Drafting Check
The Senior
Draftsman is responsible to ensure that the drawing originator has
·
completed the
drawings in accordance with PT Inco drafting standards
·
that sufficient
detail has been supplied to ensure the project can be constructed / fabricated
/ installed
·
that the drawing
is ready to be issued to the Designer for review.
Design
Review
The Designer shall check that the
drawing, as supplied, is in accordance with his / her design, and that
sufficient information detailed / supplied to allow the full scope of the work to
be completed.
The designer shall complete a
"constructability" review to ensure the design can be built as
designed, and also an "operability" review to assess performance in
operation. Any deficiencies in the
design shall be corrected and the drawings revised accordingly.
Peer
Review
A Senior Engineer shall be responsible
to complete a technical review of the drawing to ensure the design as supplied
is satisfactory to complete the required objective and the that the design
satisfies accepted and applicable design standards.
As part of this process the Senior
Engineer may require the Designer to supply design calculations or the design
philosophy and parameters used.
Drawing
Approval
The drawing approval (generally
"Released for Construction"), shall be completed by the Project
Manager or Superintendent of Engineering for Capital and Operating projects
respectively.
The final drawing approval is required
to ensure that the design and drawing review process has been completed by
relevant and suitably qualified staff, and that the drawing has been signed off
accordingly. This final approval process
shall also ensure that all the required information is supplied in the
associated work package, and that all other administrative requirements, are
completed before issue of the work
package.