Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
MECHANICAL ASSESSMENT TEMPLATE
Work Instructions
Topic specialists should use this template to record their assessment of the Mechanical Engineering aspects of a safety case. The scope of a Mechanical
assessment is listed overleaf. Assessment should be against the requirements of SCR2015.
Exemplar Approach - This template should be used in accordance with the scope of the Assessment Instructions when the topic is included for assessment.
An exemplar approach may be sufficient if some material has been previously accepted and has not materially changed. For example a CMAPP or SEMS
from an existing, accepted safety case.
The template is one of a series covering all assessment topics, which together form a complete record of the safety case assessment and create evidence of
how the decision to accept the case, or not, was reached. The templates identify the specific regulatory requirements of SCR2015 for the topic and indicate
what the competent authority expects to find within a safety case to demonstrate that those requirements are met. The template complements the published
guidance that supports the regulations and topic sector guidance. The templates are available to promote transparency and assist duty holders in drafting
submissions.
Green text indicates regulatory requirements that are new in SCR2015.
Black text represents regulatory requirements that are contained in both SCR2005 and SCR2015.
Non Acceptance Issue - A Non Acceptance Issue (NAI) is a deficiency in the demonstration made within a safety case, which, if not resolved, will prevent the
case from being accepted under the relevant statutory provisions. Non Acceptance Issues must be sent by a formal letters to the duty holder requiring them
to be dealt with in the appropriate manner, giving the duty holder a clear understanding of how to address the deficiency.
Clarification - A Clarification is an explanation provided by a duty holder on request during assessment to enable the assessing Inspectors to be confident of
their interpretation of the information in a safety case. Clarifications are a routine part of assessment work and should be raised with a duty holder promptly.
Clarifications do not require formal letters. Communicating by telephone and email is sufficient. A meeting between the duty holder and relevant topic
specialists may also be appropriate in some circumstances for clarifications. Clarification is not a first stage before raising non-acceptance issues. Any
aspect that could credibly lead to a Non-Acceptance Issue should be raised as such in the first instance.
Design or Relocation Notification - Where the template is used to aid the inspection of a Design or Relocation Notification, Inspectors should consider if the
information provided meets the requirements of Schedule 5 of the regulations. The inspection must identify any Potential Non Acceptance Issues to draw to
the duty holder’s attention. Reference to these requirements outlined in Sections 1(a) to 1(e) of this template may be useful when forming an opinion. A
record of the inspection should be made in Section 7.
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Page 1 of 13
Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
Scope of Mechanical Assessment
A Mechanical assessment will include the Mechanical Engineering major accident hazards of ‘Loss of Containment – Process’
GASCET section 5.1 plus elements from GASCET section 3 ‘Structural Integrity’. The relevant sections are listed below. The
Mechanical assessment applies to all fixed installations, mobile installations (MODU’s & Flotels) and floating production
installations. Draft regulatory requirements are included at the end of this template.
Relevant Pre-Existing Guidance

APOSC Principles:
Most APOSC principles can be used to guide a Mechanical assessment. The most commonly used are listed below:
Principle 1
The factual information should meet the SCR05 requirements and provide sufficient detail to support the arguments made in the case
Principle 2
The safety case should demonstrate that the management system is adequate to ensure compliance with the relevant statutory provisions
Principle 3
The safety case should show appropriate levels of control during each phase of the installation life cycle
Principle 4
A systematic process should be used to identify all reasonably foreseeable major accident hazards that apply to the installation, together with
potential initiating events or sequences of events
Principle 10
The identification of risk reduction measures should be systematic and take into account new knowledge
Principle 11
The reasoning behind the choice of risk reduction measures to be implemented should be described. Decisions on implementation should take
reasonable practicability into account
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
Principle 12
Risk reduction measures identified, as part of the risk assessment, should be implemented if they are reasonably practicable
Principle 13
In deciding what is reasonably practicable, the case should show how relevant good practice and judgement based on sound engineering,
management and human factors principles have been taken into account
Principle 15
Measures taken to manage major accident hazards should be described
Principle 16
The safety case should explain how inherently safer design concepts have been applied in the design decisions taken
Principle 17
The measures for preventing major accident hazards should take account of the various activities undertaken during the installation's current
phase of operation
Principle 26
A design notifications should describe how the principles of risk evaluation and management are being applied to the design to ensure that major
accident risks will be controlled

GASCET sections:
Section 3 ’Structural Integrity’
3.G16 Dropped Objects (Lifting Operations)
3.G17 Management System procedures
3.G18 Inadequate design
3.G19 Inadequate Inspection, Repair and Maintenance during Fabrication and Operation
3.G20 Inadequate Re-assessment
3.G21 Inadequate Verification
3.F10 Use of best design practice
3.F14 Maintenance Management Procedures
3.F18 Maintenance and Repair Management Procedures
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]

HID Inspection Guides (Offshore)


Offshore Installation Maintenance Management
Offshore Mechanical Handling and Crane Operations
SCR2015 Regulation 8 – Safety and Environmental Management System
SCR2015 Regulatory Requirement
8.— (2) In the case of a body corporate or un-incorporate, the safety and environmental management
system must include the organisational structure, responsibilities, practices, procedures, processes
and resources for determining and implementing the corporate major accident prevention policy.
Assessment Criteria / Minimum Information
SC Ref
Criteria Met / Not Met - Assessment Comments
NAI
‘Loss of Containment – Process’
All sections
Clarification
Section 5.1
Does the SEMS provide sufficient information about the
mechanical engineering roles and responsibilities for the
duty holder both onshore and offshore? In respect of
Mechanical Engineering examples of the relevant key
roles might include:
 Engineering Managers.
 Asset Engineers.
 Technical Authorities.
 Maintenance Supervisors.
 Senior and Offshore Inspection Engineers.
Does the SEMS include a description of the verification
scheme?
See Schedule 3 for further detail.
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
SCR2015 Regulation 9 – Establishment of verification scheme
Assessment Criteria / Minimum Information
SC Ref
NAI
Clarification
SCR2015 Regulatory Requirement
The duty holder must establish a scheme (a “verification scheme”) for ensuring, by the
means described in paragraph (2), that the safety and environmental-critical elements and the
specified plant—
(a) are or, where they remain to be provided, will be suitable; and
(b) where they have been provided, remain in good repair and condition.
Criteria Met / Not Met - Assessment Comments
Does the SC show that that the duty holder has
demonstrated the adequacy of their verification scheme?
Have mechanical safety and environmental-critical
elements and specified plant have been identified?
Examples include:
 Cranes.
 Reciprocating and rotating machinery e.g. turbines,
compressors, process and firewater pumps,
generators.
 Hydrocarbon containing pressure equipment.
 Safety critical valves and other protective devices.
See Schedule 4 for further detail.
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
Assessment Criteria / Minimum Information
SC Ref
NAI
15.—(1) The operator of a production installation which is to be established in external waters
must—
(a) prepare a design notification containing, subject to paragraph (6), the particulars specified
in Schedule 5
Clarification
SCR2015 Regulation 15 – Design and relocation notifications for production installation
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Eliminating risk at source through good design is preferable
to retrospective or mitigating action. Is there evidence of
this?
Note the regulation only applies to the major accident
hazards aspects of the design. The regulation requires the
duty holder to provide a broad overview of the design and
the design process.
(c) all hazards with the potential to cause a major accident have been identified;
Assessment Criteria / Minimum Information
SC Ref
Criteria Met / Not Met - Assessment Comments
NAI
SCR2015 Regulation 16 – Management and Control of Major Hazards
SCR2015 Regulatory Requirement
Clarific
ation
See Schedule 5 for details of what should be included.
Is there evidence that the major accident hazards and the
initiating events for a MAH have been identified and the
risks adequately addressed? From a mechanical
engineering perspective these could arise from:
 Crane collapse.
 Dropped object or swinging load.
 Reciprocating and rotating equipment failure and
missile generation.
 Pressure equipment failure e.g. hydrocarbon
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]

vessel, flow line or protective device.
Active fire protection failure.
SC Ref
Criteria Met / Not Met - Assessment Comments
NAI
Assessment Criteria / Minimum Information
NAI
a duty holder must revise a current safety case—
(a) when appropriate; and (b) when directed to do so by the competent authority
Clarificatio
n
SCR2015 Regulation 23 – Review of Safety Case
SCR2015 Regulatory Requirement
Clarification
See schedule 6 for a production installation and Schedule 7
for a non-production installation.
Is there evidence in the thorough review of the safety case
that mechanical related aspects have been considered? For
example:
 Any modifications or repairs to the structure or any
plant where changes may have an impact on
safety.
 The introduction of new activities.
 Consideration of the cumulative effect of a number
of small changes which may impact on safety.
 An extension of use beyond original design life.
 Any major changes in technology.
 The continued relevance of existing procedures.
SCR2015 Regulation 32 – Standards and guidance on best practice
SCR2015 Regulatory Requirement
Every duty holder must cooperate with the competent authority to establish and
implement a priority plan for the development of standards, guidance and rules which will give
effect to best practice in major accident prevention, and limitation of consequences of major
accidents should they nonetheless occur.
Assessment Criteria / Minimum Information
SC Ref
Criteria Met / Not Met - Assessment Comments
Does the duty holder have measures in place to identify
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
Regulation 8
1. The dh must prepare a document setting out its safety and environmental management system
4. The SEMS must address the particulars in Schedule 3
Assessment Criteria / Minimum Information
SC Ref
Criteria Met / Not Met - Assessment Comments
NAI
Schedule 3–Particulars to be addressed in a Safety and Environmental Management System
SCR2015 Regulatory Requirement
Clarification
new standards and guidance and where necessary update
their existing ones?
For mechanical systems this could cover new guidance on
the management of lifting operations, life extension of
rotating equipment, new inspection techniques for pressure
equipment, safety alerts / notices.
Matters relevant for mechanical engineering include:
 Organisational structure/roles and responsibilities.
 Identification & control of major hazards (i.e. a clear
link between MH risk assessment and preventative
measures.
 Control of modifications.
 Performance monitoring.
 Audit and review arrangements.
Assessment Criteria / Minimum Information
TRIM: 2015/______
Clarification
3. The nature and frequency of examination and testing.
4. The arrangements for the making and preservation of records showing—
(a) the examination and testing carried out;
(b) the findings of the examination and testing;
(c) any remedial action recommended; and
(d) the remedial action performed.
6. The arrangements for review and revision of the scheme.
SC Ref
NAI
Schedule 4 – Matters to be provided for in Verification
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Revised: [Date] - DRAFT
Owner: ED4.1
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
The minimum information should include:
 The verification scheme identifies the nature and
frequency of examination and testing to be
undertaken for relevant mechanical plant such as
pressure
plant
(pipework/vessels/protective
devices), machinery (process and fire pumps,
compressors, turbines, generators), cranes etc.
 A system is in place to ensure the above activities
are undertaken and that the results are recorded.
 Where remedial actions are required these are
documented and recorded when completed.
 There are review arrangements in place, and, if
necessary, a revision of the verification scheme for
relevant mechanical plant.
Assessment Criteria / Minimum Information
SC Ref
NAI
15.—(1) The operator of a production installation which is to be established in external waters
must—
(a) prepare a design notification containing, subject to paragraph (6), the particulars specified
in Schedule 5
Clarification
SCR2015 Schedule 5 – Particulars to be included in a design notification or a relocation notification for a production
installation
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Does the safety case provide a description of the chosen
design concept in relation to the MAH scenarios and
include elements such as:




The principal features of the design of structure and
plant.
The types of operation which the installation is capable of
performing.
Any novel techniques, materials or equipment planned
for use.
The principal systems on the installation
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]



The installation layout.
The process technology to be used.
A description of the verification scheme.
Assessment Criteria / Minimum Information
SC Ref
NAI
8. (e) any relevant codes, standards and guidance used in the construction and commissioning
of the installation.
11. A description, with suitable diagrams, of the installation, including a description of—
(a) the main and secondary structure of the installation and its materials;
(b) its plant;
(c) the layout and configuration of its plant;
(d) any connections to any pipeline or other installation; and
(e) any relevant codes, standards and guidance used in the construction and commissioning
of the installation.
Clarification
SCR2015 Schedule 6 – Particulars to be included in a safety case for a production installation
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Does the SC give a clear description of the SEMS?
Is there a description of the verification scheme?
Does the safety case provide a description of:




The principal features of the design of the installation, the
relevant mechanical plant and the layout of the plant?
Any novel techniques, materials or equipment planned
for use?
The principal utility systems on the installation such as
diesel systems, service water systems, potable water
systems, HVAC systems etc.?
The main items of mechanical plant including drawings to
identify layout and configuration of cranes, pressure
equipment, turbines, diesel generators, fire pumps etc.?
Is there sufficient evidence in the safety case that relevant
mechanical standards and guidance have been employed
in the construction and commissioning of the mechanical
plant?
Are descriptions and diagrams provided suitable e.g.
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
process flow diagrams (with inventories, normal operating
pressures/temperatures, ESDV’s) utility schematics?
Assessment Criteria / Minimum Information
SC Ref
NAI
7. A description of the main requirements in the specification for the design of the installation
and its plant, which must include—
(c) a description of how the owner has ensured, or will ensure, the suitability of the safety
and environmental-critical elements; and
(d) any relevant codes, standards and guidance used in the construction and commissioning
of the installation.
10. A description, with suitable diagrams, of the installation, including a description of—
(a) the main and secondary structure of the installation and its materials;
(b) its plant;
(c) the layout and configuration of its plant
Clarification
SCR2015 Schedule 7 – Particulars to be included in a safety case for a non-production installation.
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Does the SC give a clear description of the SEMS?
Does the SC provide a description of the verification
scheme?
Does the safety case provide a description of:




The principal features of the design of structure and
plant?
Any novel techniques, materials or equipment planned
for use?
The principal utility systems on the installation such as
diesel systems, service water systems, potable water
systems, HVAC systems etc.?
The main items of mechanical plant including drawings to
identify layout and configuration of cranes, turbines,
diesel generators, fire pumps etc.?
Is there sufficient evidence in the safety case that relevant
mechanical codes, standards and guidance have been
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
used in the construction and commissioning of the
mechanical plant?
Are the descriptions and diagrams provided suitable?
Assessment Criteria / Minimum Information
SC Ref
Clarification
20.—(1) The operator of a fixed installation in external waters must ensure that it is not
dismantled unless—
(a) the operator has prepared revisions to the current safety case containing, subject to
paragraph (2), the particulars specified in regulation 16 and Schedule 8
NAI
SCR2015 Schedule 8 – Particulars to be included in a current safety case in respect of the dismantling of a fixed
installation
SCR2015 Regulatory Requirement
Criteria Met / Not Met - Assessment Comments
Are the dismantling start and finish dates given?
Does the SC demonstrate that safe methods of isolating
and containing hydrocarbons during the various state of the
project have been assessed?
Does the SC explain the methods by which equipment
remaining in service is identified from redundant plant?
Does the SC demonstrate how other safety critical plant
(e.g. utilities) will be protected from damage during the
dismantling phases?
Does the SC describe how the major items of plant and/or
modules will be lifted off the installation?
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Document Title: Mechanical Assessment Template
Logos: DECC / HSE / OSDR Logos
Case Title - [Safety Case Title]
Duty Holder – [Company Name]
COIN Numbers - [Case] / [SVC Number]
Topic Assessor – [Name]
MECHANICAL REQUIREMENTS – ASSESSMENT SUMMARY
SCR2015 Regulatory Requirement
Clarification
Required
NAI
Required
Conclusion
1. Mechanical Requirements
a) SCR2015 Regulation 8 – Safety and
environmental management systems (SEMS)
b) SCR2015 Regulation 9 – Establishment of
verification scheme
c) SCR2015 Regulation 15 – Design and relocation
notifications for production installations
d) SCR2015 Regulation 16 – Management and
control of major accident hazards
e) SCR2015 Regulation 23 – Review of Safety Case
SCR2015 Regulation 32 – Standards and
Guidance on best practice
g) SCR2015 Schedule 3 – Particulars to be
addressed in a safety and environmental
management system
h) SCR2015 Schedule 4 – Matters to be provided
for in a verification scheme
i) SCR2015 Schedule 5 – Particulars to be included
in a design or relocation notification for a
production installation
j) SCR2015 Schedule 6 - Particulars to be included
in a safety case for a production installation
k) SCR2015 Schedule 7 – Particulars to be included
in a safety case for a non-production installation
l) SCR2015 Schedule 8 – Particulars to be included
in respect of the dismantling of a fixed
installation
f)
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