drawing checking procedure

ENGINEERING PROCEDURE – DRAWING CHECKING PROCEDURE

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TABLE OF CONTENTS

1.0 Purpose

2.0 Objectives

3.0 Scope

4.0 Compliance

5.0 General

6.0 Responsibilities

6.1 Senior Supervisor-Projects

6.2 Drawing Control Supervisor

6.3 Project Engineer

6.4 Draftsperson and Drawing Checker

7.0 Checking Practice

8.0 Checking Method

9.0 Drawing Print Checking Colours

10.0 Drawing Check List


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1.0 Purpose

This procedure has been developed to provide a standardized and consistent approach in

checking for and correcting errors in AutoCAD and manual drawings for the

PETROJAM Ltd. Drawing Office.

2.0 Objectives

2.1 Ensure standardization of information, presentation and organization on drawings.

2.2 Deliver consistent drawing quality.

2.3 Minimize drawing errors and construction changes.

2.4 Promote ease of drawing interpretation and information understanding.

2.5 Ensure completeness of information to be conveyed.

3.0 Scope

This Procedure outlines standard practices to be adopted when checking and evaluating

completeness and accuracy of Project Drawings.

4.0 Compliance

All persons involved in checking Project Drawings shall adhere to this Procedure to

ensure that a uniform, complete and quality assured product will result. Compliance is

expected in all cases and any required deviation from this Procedure must receive prior

approval from Senior Supervisor-Projects.

5.0 General

This procedure is to be followed by all Engineering and Contract personnel directly

involved with Project Drawing development or checking.

6.0 Responsibilities

The positional responsibilities for the proper adherence to this Procedure on all

PETROJAM LIMITED projects are as follows.


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6.1 Senior Projects Engineering Supervisor

6.1.1 Audit adherence to and compliance with this Procedure on all

PETROJAM Projects managed by the Technical Department/Projects

Group.

6.1.2 Evaluation of any non-compliance and implementation of required

corrective activities.

6.1.3 Review and update of this procedure every three (3) years.

6.1.4 Ensure understanding of this procedure by Strategic Planning personnel

directly involved with project development.

6.1.5 Review and approval of all Drawings.

6.2 Drawing Control Supervisor

6.2.1 Ensure adherence to and compliance with this Procedure on all projects

managed by the Technical Department/Projects Group.

6.2.2 Training of all Engineering personnel directly involved with project

development. All personnel are to be initially trained and retrained every

two (2) years.

6.2.3 Provide Drawing Checking assets and ensure all Drawings are properly

checked and corrected.

6.2.4 Assign checking responsibilities, ensure competence of Checker, ensure

proper information is provided to Checker and monitor progress of

checking.

6.2.5 Ensure proper storage and control of Drawing Check Prints.

6.2.6 Review and approval of all Drawings and initiation of approval routing.

6.2.7 Ensure proper Drawing storage, Archive & Back-up.

6.2.8 Ensure proper storage and control of all Project Documentation.

6.3 Project Engineer

6.3.1 Submission of Project Scope, all sketches, specifications and other

information required to complete requested Drawings and associated

documentation and allow proper Drawing Checking.

6.3.2 Directly work with Drawing Checker to facilitate his/her efforts.

6.3.3 Ensure effective presentation of all required information to facilitate

efficient construction. The Project Engineer is expected to directly work


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with the Drawing Office during the development of all documentation and

timely provide direction and information.

6.3.4 Review and approval of all Drawings and associated documentation.

Ensure proper application and use of Design Standards, Material

Specifications and Equipment Specifications.

6.4 Draftsperson and Drawing Checker

6.4.1 Ensure understanding of this Procedure and all referenced Procedures and

compliance with these Procedures at all times.

6.4.2 Provide all services assigned by the Drawing Control Supervisor in an

efficient and expeditious manner. Ensure all information developed and

presented is accurate, complies with Standard Documentation, complies

with Design Standards and Material Specifications, can be efficiently

reviewed and used, and is practically error free. This will require

dedication to detail and diligence with emphasis on Quality and Added

Value.

6.4.3 Provide Check Prints, make corrections, retain marked Check Prints until

Project completion, provide final Drawings and signed Drawings.

7.0 Checking Practice

Project Drawings checking shall be completed by competent persons, as assigned by the

Drawing Office Supervisor, according to the following guidelines.

7.1 All project Drawings are to be checked for compliance with the Drawing Office

Procedures, clarity, standard structure, technical content, quality completeness

and adherence to design standards. Check prints are to be retained by the

Draftsperson until project completion and are subject to audit.

7.2 All AutoCAD Drawings are to be checked for compliance with the Drawing

Office Procedures and adherence to normal AutoCAD standards.

7.3 Drawing checking is not considered to be design checking although design is to

be considered at all times. Any questions concerning design shall be discussed

with and referred to the Project Engineer for h view and clarification.is/her re


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7.4 Drawing checkers must be familiar with the requirements of the Drawing Office

Procedures, standard drafting Procedures, the project scope and concept, relevant

design standards and any additional information pertinent to the drawing to be

checked.

7.5 Drafting personnel will not be the last check of their own work prior to seeking

approvals.

7.6 When checking drawings, the checker and the draftsperson completing required

changes shall use the colour markings defined in section 9.0.

7.7 The Checker shall use the drawing check lists provided in section 10.0 to ensure

all pertinent factors are included and properly addressed. The checker shall use

his/her judgement to determine applicability and pertinence and shall draw from

the department expertise as required.

7.8 Manual checking of drawings shall be on bond paper Check Prints. A Check Print

shall be so designated by stencilling “Check Print” in large bold lettering above

the title block.

7.9 The checker shall use a “red” pencil to make all changes and comments, all

mark-up text shall be printed and the checker shall give emphasis to neatness,

clarity and conciseness.

7.10 The checker shall initial and date all comments and mark-ups requiring action and

those not so marked will be deemed to require no action.

7.11 Any errors in mark-ups shall be noted as such and lined through.

8.0 Checking Method

Each Project Drawing is to be checked frequently during development by those directly

involved with the work. Use of checking services does not diminish the responsibilities of

the draftsperson or Project Engineer for thorough, complete and quality work. As


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drawing deficiencies are noted, they are to be corrected immediately and prior to

Drawing Checking.

8.1 The draftsperson shall be aware of the importance of quality work and shall check

his/her own work frequently during drawing development. The Project Engineer

shall work closely with the draftsperson and shall check each drawing at discreet

intermediate stages or at least weekly.

8.2 When a drawing is deemed complete by the draftsperson and Project Engineer,

the draftsperson shall produce a “check print” on bond paper and provide it to the

Drawing Office Supervisor for review.

8.3 The supervisor shall make a cursory review of the drawing for basic content,

structure and adherence to drafting standards. Any noted deficiencies shall be

corrected and a new check print produced.

8.4 The Drawing Office Supervisor shall designate a Drawing Checker and provide

him/her with the check print and all information required (scope, reference

drawings, project criteria, applicable specifications, etc.) to properly review the

drawing.

8.5 The checker is to thoroughly review all information on the drawing, ensure all

standards are met, mark all required changes and return the print to the

draftsperson.

8.6 The draftsperson is to review all mark-ups, clarify any questions and make the

required changes to the drawing, the marked up check print is to be retained for

future reference and a new check print shall be provided to the checker for any

additional changes or corrections.

8.7 When a drawing (AutoCAD) is deemed complete by the checker, as per review of

the check print, the Checker will check the digitized version of the drawing for

compliance with the Drawing Office Procedures and normal AutoCAD standards.

The draftsperson shall immediately correct any noted deficiencies.

8.8 After digital check, the drawing is to be printed on vellum, signed by the

Draftsperson and Checker and provided to the Drawing Office Supervisor.


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8.9 The Drawing Office Supervisor shall initiate routing of the Drawing for approval

as per “General Drafting Practices”.

9.0 Drawing Print Checking Colours

Colours used for marking of check prints are to be as follows, with no exceptions.

Yellow Checked Ok (Checker or project engineer)

Red All corrections or mark-ups (Checker or project engineer)

Green Back-drafted (Draftsperson)

Blue Back-checked (Checker)

10.0 Drawing Check List

The drawing checker is expected to use the attached standard drawing check list to

facilitate his/her efforts. The list was developed to provide a guide or outline only and is

not intended to include all factors or cover all necessary issues. Documented evidence of

checking is by means of the checkers signature or initial (and date) on mark ups of the

check print so retention of the checklist is not required.


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DRAWING CHECK LIST

This drawing check list is to be used by Drawing checkers, Draftspersons and Project Engineers

to facilitate proper development of Project Drawings. This is not intended to include all factors

or cover all necessary issues but to provide a guide to help ensure that all drawings are complete

and comply with the Engineering Procedures – Drawing Office Procedures.

Contractual Compliance Ok Review

Compliance to the Project criteria: Scope of Work, Sketches, etc.

Compliance to relevant Codes, Procedures and Standards – Engineering,

Material, etc.

Compliance to Manufacturers data

Practicality of Fabrication

Practicality of Construction

Operability and Maintenance

Safety requirements

Accesses and Clearances

“Off the shelf” component availability

Standardization of components and parts

Uniformity within the drawing and relative to associated drawings

Equipment numbering consistency and correctness

General

Drawing title

Drawing numbers

Revision

Drawn by

Date drawings commenced

Reference drawings (check that they are applicable)

Scale


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Drawing Contents Check Ok Review

Notes – General, Mech., Civil, Structural, Arch. & Electrical (Check

spelling also)

North sign (Orientation)

Legend

Key or Block Plan

Any appliques (stickers)

Plan

Elevation – correctly orientated

Section – called up and titled

Detail

Symbols

Abbreviations as per Department standard list

Datum’s, RLs Els WPs etc.

Grid lines, Grid references – (Standard)

Lettering – legibility and spelling

Dimensional accuracy

Use of “certified” drawings (Get Engineers approval if uncertified)

Fit for purpose

Linework ie. Centre lines

Dimension lines

Match lines

New works

Existing works

Future works

Drawing to Drawing interface

“HOLDS”

Units of measurement correctly specified

Materials correctly specified


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Mechanical Check List Ok Review

Safety, clearances, etc.

Machining tolerances

Surface finish

Surface treatment

Component marking

Signage – cranes

Access to equipment

Safety Guards

Inspection/manhole access

Crane maintenance access

Equipment specification

Piping and Tank Check List

Check against P&IDs

Direction of Flow

Line number, size and materials

Valves, elbows, reducers, etc.

Instruments, gauges, etc.

Traps, drains, vents, flushing points

Any special fittings that are specified

All equipment is correctly identified and labelled

Ensure that:

Pipe routes are clear of mechanical and structural works

Piping drawings are in accordance with Engineering Specs

Dimensions are accurate and sufficient for needs required


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Ensure that: Ok Review

Dimensions are clear location-wise, BOP, etc.

Clearances between pipelines are standard

A common datum is utilized over a set of drawings

Access to removable equipment and fittings

Match marking of drawings are consistent

Piping and Tank Check List

Head clearances have been looked at and are OK

Check: Location, Elevation of mechanical equipment

Allowances for expansion, insulation and gaskets

Piping falls are allowed for

Tank orientation about 0 degree

Tank nozzle locations in Plan and elevations are consistent

Flanges match associated equipment

Valve, pipe and equipment listings

Holes in flanges are off-center (two hole)

Tank earthing is provided as required

Structural Check List

Safety clearances, etc.

Steelwork tolerances

Surface treatment

Member sized

Member marking

Floor grating – fixed, removable


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Structural Check List Ok Review

Floor grating span and direction

Welding – Symbols,

Continuous,

Intermittent,

Seal,

Plug (AWS A 2.4-86)

Temporary bracing

Stair, ladder, handrail and platform requirements/STDs

HD Bolts – mechanical/structural interface – grout allowance

Transportation size considerations

Civil/Earthworks Check List

Foundations

Reinforcements

HD Bolts – mechanical and steelwork interfaces

Grout allowance

Falls and drainage

Floor sumps

Curbing

Allow for vehicle traffic where necessary

Check interfaces with existing concrete works particularly existing

reinforcement

Concrete treatment

Construction joints

Shrinkage joints

Cast in steel

Isolation joints

Bollards


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Civil/Earthworks Check List Ok Review

Compaction

Joint sealant

Architectural Check List

Cladding – roof and walls

Ventilation – ridge vents

Door access – vehicle clearance

Natural lighting

Electrical and Instrumentation Check List

Check drawing against P&ID

Symbology required for project in question

Preferred equipment

Equipment to be used

Equipment numbering

drawing checking procedure

Documents