Overview

This page contains the Oil SSTS URD and SRD, as described below. During the SSPM course, you will be required to populate the URD and SRD using the information provided.

User Requirements Document (URD)

The purpose of the User Requirement Document is to be an all embracing, structured expression of the user need for a bounded operational capability and is the means by which the customer develops, communicates and maintains the user’s requirement throughout the life of the system.  The requirements are refined as more information becomes available into a cascaded set of system requirements captured in the SRD.

The inclusion of safety requirements in a URD should be the principal aspect in ensuring that the risks associated with a system are ALARP. The URD remains a live document until Main Gate. Traceability must be maintained between the URD and subsequent analysis to ensure resulting product can deliver its intended role.

Task Description

Develop as many Safety Requirements as you can (no less than six) using the Scenario, your Block Diagram and the output from the Preliminary Hazard Identification. The URD should be based on your understanding of the requirements, and for each safety requirement:

    • Identify the type of requirement (safety/performance)
    • Capture the safety thresholds and targets, and
    • Capture any rationale for the requirements
    • Capture the means for verification (test, design, inspection, calculation, analysis, etc)

When developing the Oil SSTS URD, consider::

    • Legislative requirements
    • Functional requirements
    • Physical / design limitations
    • Reliability / integrity levels
    • Performance etc.

Justification can be in form legislative compliance, standards, best practice, first principles derivation etc.

Oil SSTS URD

wdt_ID URD ID User Requirement Type of URD (Safety/Performance) Safety Thresholds / Targets Rationale for Requirement
366
367 1 User shall be compliant with Legislation, including HSE Legislation Safety Meet the legislation legislative compliant system and avoid unacceptable risk to personnel working around the system.
368 2 Isolate the Well Head from Oil Transfer System within 10 seconds Performance Isolate Well Head from Oil SSTS within 10 seconds Maximise safety. minimise platform down time
369 3 Ability to receive crude oil from the extraction point off the rig, at pressures up to 20 bar Performance Pressure up to 20 bar Maximise safety, minimise platform down time
370 4 Comply with Regulations Safety Compliance with Regulations such as; (i) noise at work regulations, (ii) control of pollutions Ensure adherence to Health & Safety practices and legal compliance
371 5 Capability shall provide for extraction of crude oil from provided hydrocarbons (from well head) Performance Seperation of Crude Oil into; (i) gas, (ii) water, (iii) sediment, (iv) processed oil Fulfilment of design intent
372 6 Capability shall provide for storage of crude oil Performance tbc Fulfilment of design intent
373 7 Capability shall provide for transfer of crude oil to tanker Performance tbc Fulfilment of design intent
374 8 Capability shall provide for measurement of offloaded oil (to tanker) Performance tbc Fulfilment of design intent
375 9 Capability shall provide for continuous operations Performance Duty/standby? Something for reliability / integrity levels Fulfilment of design intent