The document outlines the procedure for conducting Hazard Study 4 in refinery processes, focusing on construction verification and regulatory compliance. It emphasizes the roles of the commissioning manager and the checks required for installation, implementation, and modifications, ensuring that safety and operational standards are met. Additionally, it highlights the need for documentation and thorough review of actions from previous hazard studies before operations commence.

1. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
GBH Enterprises, Ltd.
Process Safety Guide:
GBHE-PSG-HST-050
Study 4: Construction / Design
Verification
Process Information Disclaimer
Information contained in this publication or as otherwise supplied to Users is
believed to be accurate and correct at time of going to press, and is given in
good faith, but it is for the User to satisfy itself of the suitability of the information
for its own particular purpose. GBHE gives no warranty as to the fitness of this
information for any particular purpose and any implied warranty or condition
(statutory or otherwise) is excluded except to the extent that exclusion is
prevented by law. GBHE accepts no liability resulting from reliance on this
information. Freedom under Patent, Copyright and Designs cannot be assumed.

2. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
Process Safety Guide: Study 4: Construction / Design Verification
CONTENTS
4.0 PURPOSE
4.0.1 Team
4.0.2 Timing
4.0.3 Documentation
HAZARD STUDY 4: APPLICATION
4.1 METHOD
4.1.1 Installation Check
4.1.2 Implementation Check
4.1.3 Modification Check
4.2 REVIEW OF HAZARD STUDY 4

3. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
4.0 PURPOSE
The purpose of Hazard Study 4 is to check that the project has been constructed
as the design intended, that actions from previous Hazard Studies have been
completed and implemented in the design and installation, that detailed
implementation of the project meets regulatory and company requirements.
This document should be used in conjunction with a process safety publication
such as ’HAZOP: Guide to best practice’ (available from IChemE) or ‘Guidelines
for Hazard Evaluation Procedures’ (available from CCPS).
4.0.1 Team
The Commissioning Manager is responsible for the completion of study 4
with or without the assistance of site or project resources as appropriate.
4.0.2 Timing
Hazard Study 4 should be completed prior to the introduction of process
materials, or the commencement of operations, whichever is the sooner.

4. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
While study 4 cannot be finished until the plant is mechanically complete,
it can be started almost immediately after the completion of study 3 with
the closing out of Hazard Study Actions. Regular visits to the plant during
construction can surface concerns at a time when they can be addressed
with the least possible impact on the schedule.
4.0.3 Documentation
The Commissioning Manager should arrange for the addition of relevant
documents to the Project SSHE dossier (worksheet j). A list of outstanding
actions should be produced and added to the dossier.
HAZARD STUDY 4: APPLICATION
The following sections 4.1 and 4.2 describe how to conduct Hazard Study 4.
4.1 METHOD
This study will require many actions to be carried out by a number of people, all
coordinated by the Commissioning Manager, and will not normally involve many
formal meetings. Use of the Hazard Study 4 worksheet (worksheet r) will help the
Commissioning Manager ensure that a thorough check of the installation is
achieved.

5. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
4.1.1 Installation Check
Check that the hardware is as the design intended and that the software
requirements are completed.
4.1.2 Implementation Check
Check that what was called for in earlier hazard studies and engineering
change orders has been implemented.
4.1.3 Modification Check
Check that modifications made during construction/commissioning have
been formally reviewed and documented.
4.2 REVIEW OF HAZARD STUDY 4
At the completion of Hazard Study 4 the following key activities should have been
completed:
• Actions from earlier hazard studies have been completed either as agreed
or that any changes to the actions are justified.
• All actions and changes have been documented.
• Changes made following Hazard Study 3 have been studied and
recorded.
• Operating instructions are available for normal operation, start-up, planned
and emergency shutdowns and, where appropriate, for maintenance and
decontamination of plant.
• Emergency procedures are available.
• A review of the arrangements for the protection of employee health,
covering the facilities provided and the arrangements for workplace
monitoring.

6. Refinery Process Stream Purification Refinery Process Catalysts Troubleshooting Refinery Process Catalyst Start-Up / Shutdown
Activation Reduction In-situ Ex-situ Sulfiding Specializing in Refinery Process Catalyst Performance Evaluation Heat & Mass
Balance Analysis Catalyst Remaining Life Determination Catalyst Deactivation Assessment Catalyst Performance
Characterization Refining & Gas Processing & Petrochemical Industries Catalysts / Process Technology - Hydrogen Catalysts /
Process Technology – Ammonia Catalyst Process Technology - Methanol Catalysts / process Technology – Petrochemicals
Specializing in the Development & Commercialization of New Technology in the Refining & Petrochemical Industries
Web Site: www.GBHEnterprises.com
• A review of the arrangements, including emergency systems, for
employee safety.
• A review of the equipment and systems provided to protect the
environment and for monitoring environmental performance.