BS EN 14620-1:2006 pdf download
BS EN 14620-1:2006 pdf download.Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0°C and -165 °C- Part 1: General.
— collecting failure rate data;
determination of the frequency of these hazards:
— determination of the effects on event consequences and probablkties of available mitigation measures:
examination of the potential knock-on effects:
determination of the consequences of each hazard:
– determination of risk by multiplying frequency and consequence and summing over all scenarios;
— comparison of risk levels with predetermined target values.
4.2.5.3 DeterministIc
The deterministic approach consists of:
– listing of hazards:
establishment of credible scenarios:
— determination of the consequences:
justification of the necessary safety improvement measures to limit the risks
4.2.6 Changes
4.2.6.1 Potential changes
Attention shall be paid to posstie changes of the hazard situation during the lifetime of the tank/plant to avoid lack of safety in the future.
NOTE Other faces can be bu ne the tank or outside the plant boundanes. Otherwise, m the case of a major change, the risk and damage potential may have to be assessed again and improvements may be required.
42.6.2 Changes based on findings
The outcome of the risk assessn nt shal be evaluated carefully. If changes have to be carned out then
the risk assessment shall be repeated.
4.2.7 Determination of actions
The risk assessment shall identify critical factors thai shall be taken into account in the design of the tank The acctdental actions (spillages, fires, explosions etc.) shall be identified.
4.2.8 Risk profiles
When required by local authonties, flsk profiles shall be calculated by determining the consequences from a number of scenarios, By adapting certain critena for death from toxic substances, radiation from fires and explosion over pressure, effect distances shall be determined, Based on incident frequencies and effects from meteorological conditions (wind direction, stability etc.) the contribution from each scenario to a point at a distance from the activity shall be calculated. By putting a grid over the area surrounding the activity and summing the contribution from all scenarios for each grid point a three dimensional (x, y, risk) picture shall emerge
NOTE Usually this picture is then reduced to 20 by connecting points of equal risk (e.g. 10 1O and 10 fatalities per year) creating the risk profiles. Legalized risk csiteria exist for a number of countries or can be developed in consultation with authorities.
5 Quality assurance and quality control
A quality management system for the design, procurement of matenals. construction and testing of the tank shall be incorporated.
NOTE The guidano. given in EN ISO 9001 is highly recommended
6 Health, safety and environment plan
The contractor shall prepare a Health. Safety and Enwonrnent (HSE) plan for the design, construction and commissioning of the tank which shall conform to the overall obgectives set out by the purchaser. The plan shall include the responsibilities, activities applicable to local or national laws and legislation. It shall specify requirements for safe working procedures for personnel safety and environmental protection dunng the design and construction phases.
7 General design considerations
7.1 General
7.1.1 ResponsibilIties
The purchaser shall be responsible for The specification of essential tank design data in accordance with Annex B.
The contractor shall be responsible for the design, procurement and construction of the tank
Subjects of interface e.g. pre-commissioning and commiss4on.ng shall be agreed between the purchaser and the contractor.
Since separate parties often carry out the design of steal, concrete and insulation components, it is essential that there is a clear understanding of the split of work and responsibilities, so that the final tank design is fully integrated. There shall be a defined reporting structure between the various engineering parties, with one party having the responstbility for all engineerwig co-ordination.
