3.2.1 The objectives of the assessment are to:
- Evaluate safety risks associated with the
use of the regasification system where the requirements within the Rules are
not satisfied;
- Evaluate safety risks associated with the use
of the regasification system where specifically required by the Rules;
- for (a) and (b), demonstrate that an appropriate level of safety
is achieved, which is commensurate with that generally accepted for the
containment of LNG cargoes through compliance with these Rules.
3.2.2 Where the risks cannot be eliminated, an inherently safer design shall
be sought in preference to operational/procedural controls. This shall focus on
engineered prevention of failure (e.g. minimised number of connections, increased
reliability, and redundancy).
3.2.3 The risk assessment may identify the requirement for safety measures in
addition to those specifically stated in these Rules.
3.2.4 The scope of the risk assessment may include but not be limited to:
- normal operation, start-up, normal shutdown, non-use, and
emergency shutdown of the system, during:
- pressurised gas discharge to shore; high pressure gas
venting;
- storage and handling of flammable or toxic secondary
heat transfer fluids (as applicable);
- continuous presence of liquid and vapour cargo outside
the cargo containment system;
- Barge or offshore unit-LNG transfer.
- physical layout of machinery and equipment including extension
of hazardous areas and evacuation arrangements;
- fire and explosion, process upset conditions, over-pressure and
under-pressure, mechanical and electrical failures and human error.
Consideration being given to the effects of pool and jet fires;
- the effect of cryogenic spills and pressurised leaks.
3.2.5 The risk assessment shall be undertaken by suitably qualified and
experienced individuals to a recognised Standard (e.g. as outlined in ISO/IEC
31010-2009: Risk management – Risk assessment techniques) in accordance with
LR’s ShipRight Procedure for Risk Based Certification (RBC).
3.2.6 The risk assessment shall be assessed in accordance with
Pt 11, Ch 5, 8.5 Liquefied gas transfer system 8.5.2.(g), and:
- analysis of risk associated with the barge or offshore
unit-to-ship LNG transfer in accordance with ISO 28460:2010 Petroleum and
natural gas industries – Installation and equipment for liquefied
natural gas – Ship-to-shore interface and port operations and the
relevant parts of EN 1474 as applicable, and SIGTTO LNG Ship-to-Ship
Transfer Guide for Petroleum, Chemicals and Liquefied Gases.
- process upsets associated with the land-based receiving
systems;