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CHAPTER 11 OF YOUR TEXT

REVIEW AND APPROVALOF ENGINEERING

DOCUMENTS

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WHO PREPARES THE DOCUMENTS TOBE REVIEWED?

Engineering Documents are prepared by :

Process Licensor

EPC firm/Engineering Contractor/General ContractorVendors

Package Unit Manufacturers

ALL SUCH DOCUMENTS ARE TO BE APPROVED

BY CLIENT ENGINEERS ( or Consultants?)

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WHAT ARE THE CONTENTS OFENGINEERING DOCUMENTS?

Design Basis , Codes and Standards

Flow Sheets, PFDs

Material, Heat and Utilities Balances

P & I Diagrams, Piping Diagrams, etc. Plot Plan/ Plant Layout

Equipment List, Data Sheets and Drawings

Civil Engineering Design and Underground

Construction

All Instruction Manuals : Performance Test,Operation, Safety, Quality Control, etc.

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FLOWSHEETS

Things to be noted :

1. Estimated pressure drops, leakages, gas composition

2. Difference between expected and guaranteed values

3. Metering inaccuracies and others

Review Methods:

1. Check streams for correct sequence

2. Check material balance

3. Check process conditions with process description

4. Check equipment with given Equipment List

5. Check guaranteed consumption figures

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PIPING & INSTRUMENTATIONDIAGRAMS (P&ID)

Basically it is an extended process flowsheet withvalves, fittings, instruments, etc.

1. Piping design and material specification

2. Continuity check

3. Controls : Instruments for Start ups and Shut downs,Equipment and Catalyst performance, Location ofControl Panels & sampling points, By passes oncontrol valves, Alarm Systems

4. Electrical

5. Maintenance: Blocking, Venting, Draining,Purging, Cleaning, Change of catalysts/packings

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PLOT PLAN/PLANT LAYOUT

CHECK FOR THE FOLLOWING:

1. Ease of access during construction, operation and

maintenance (including overhead andunderground pipes and cables)

2. Hazardous areas identification

3. Location of rotary m/c, stacks/flares, effluent,control room, offices, EMERGENCY EXITS, space for

expansion

4. Easy view of plant from control room

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EQUIPMENT DATA SHEETS ANDDRAWINGS

CHECK:

1. Design data used

2. Codes and standards

3. Material of construction (corrosion aspects)

4. Surface treatment

5. Heat Treatment and stress relief

6. Instrument connections

7. Means of access to vessels

8. Inspection needs9. Insulation

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DISCUSSION

1. Local engineering personnel MUST beinvolved in the process

2. For externally funded projects consultantsappointed by aid agencies should nothave the final say!

3. Technology transfer to local personnelshould be a continuous process and heldvery important throughout the process of

process design, plant construction,commissioning, start ups and operationincluding maintenance.