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Improvement of preventive fireplace safety at a tank farm

Tank farms are used for the storage of extremely flammable and explosive substances; Consequently, preventive hearth protection is of main significance. When rehabilitation of such a tank farm is deliberate, contractors usually advocate extensive – and thus costly – measures. A fire-protection answer developed by TÜV SÜD demonstrates that an equivalent level of security can additionally be reached with a a lot more cost-effective resolution. A central role in harm limitation is performed by early hearth detection utilizing thermographic cameras.
Numerous tank farms throughout Germany store petrol, diesel, kerosene or liquefied petroleum gas (LPG). In contact with air, these extremely flammable substances can type explosive mixtures. Given this, tank farms require particular measures in the area of preventive hearth safety. If rehabilitation of fire-protection systems becomes necessary at an older tank farm, far-reaching measures must be taken, not only by method of precaution but also to exclude possible liability dangers. And but not each measure that’s technologically feasible can be needed in case of a rehabilitation, as could be seen from the instance of a tank farm in Bavaria, Germany.
The tank farm is situated at a basin of a river port in Bavaria. The a part of the tank farm in want of rehabilitation covers 24 tanks with a storage quantity of between 600 and a pair of,000 cubic metres. The tank farm is used for intermediate storage of highly flammable fluids with flame points of < 21 degrees Celsius, as outlined in the German hazardous substances laws. In fireplace inspections and on-site inspections after incidents, the inspectors had identified major non-conformities in the fire-extinguishing system. To exchange the outdated and non-conforming system, an engineering firm submitted an intensive list of measures. These measures absolutely satisfied all regulatory requirements but represented a really cost-intensive answer, requiring a full rehabilitation using traditional extinguishing techniques. For ไดอะแฟรม -farm working company, the costs of implementing these measures would have added up to 1.7 million euros.
In fire safety, the challenge lies in connecting well-founded technological information and legal know-how. In follow this implies harmonising reasonable engineering providers and legal applications to acquire a cohesive, economically possible and simply carried out fire-protection idea.
Alternative resolution developed by TÜV SÜD

At the operating company’s request, TÜV SÜD’s third-party experts validated the individual measures and the cost-effectiveness of the rehabilitation plan submitted by the engineering agency. Owing to the big variety of deficiencies identified within the tank farm, the consultants first ready an inventory of priorities with the measures necessary to fulfil the safety necessities and obtain the safety aims. They arrived on the conclusion that not all of the proposed measures really needed to be implemented. Starting from this finding, they then drew up an alternative fire-protection concept that would in the end reduce the projected costs by one third.
TÜV SÜD’s rehabilitation plan included the fire-protection infrastructure already in place on the tank farm, corresponding to a non-automatic foam extinguishing system with a total foaming-agent supply of 10,500 litres distributed throughout two tanks, two submerged pumps within the port basin with a pump capacity of a hundred and eighty m3 per hour to make sure water supply for hearth fighting and sprinkling the shells and the roofs of the tanks, manual triggering of the shut-off valves and a transformer station powered by the regional power supplier. The feed-in of emergency energy was effected by the native professional fireplace department.
The engineering agency, by contrast, had deliberate to exchange the whole fire-extinguishing system. They wanted to put in three cell extinguishing-agent distribution systems in container kind for remote managed sprinkling and foaming of the tanks. This resolution would have required the set up of recent electrical, operational and management methods as properly as new pipe routes connecting the extinguishing-agent distribution methods with the fire-fighting techniques within the tank fields. The costs for the three extinguishing-agent distribution systems in container kind alone would have added as a lot as round 1.2 million euros.
Incipient hearth fighting scenario with intact energy provide and free access to the tank farm.
Implementation of three packages of measures

The various rehabilitation idea developed by TÜV SÜD, which also met the necessities of the Bavarian Building Code (BayBo [1]), offered for three essential packages of measures to achieve the safety and security objectives.
First, installation of a completely automatic infrared measuring system made by DIAS Infrared to ensure early fireplace detection. The system’s seven thermographic cameras are put in on pan-tilt models. They detect changes in temperature at the surfaces of the tanks made of different supplies and situated within the space monitored by the cameras, earlier than these adjustments in temperature may cause a fire. As the cameras can transfer, the areas to be monitored may be divided into sectors. The cameras then strategy these sectors cyclically in sequence. To defend the cameras in opposition to exterior influences, they are housed in ventilated and heated weatherproof enclosures (Fig. 1). Monitoring focuses primarily on the security devices of the tanks, pumps and motors and on the filling methods on the tank-farm premises. The management room on the tank farm and the local skilled fire department are notified immediately as soon as the temperature exceeds a sure restrict. The measure bundle also consists of remote triggering of the extinguishing-agent supply from the control centre and automation of the safety devices.
Incipient fire fighting scenario with power loss the place access to the tank farm is blocked by a cargo train.
In addition, it covers rehabilitation of the sprinkler and foam-extinguisher system. In this context, TÜV SÜD’s resolution supplied for substitute of the leaking and corroded pipe sections with new pipes and for set up of three fastened foam-extinguishing methods within the type of foam monitors to fight incipient fires immediately. In addition, a cell foam monitor was planned as a backup.
A third focus area issues safeguarding the facility supply required for early hearth detection and hearth preventing. According to the regional vitality supplier, power outages could have a duration of at least 30 minutes. Given this, the tank-farm needed an unbiased power provide system that was in a position to ensure energy provide for a minimal of 2 hours. The specialists relied on battery buffering and a diesel operated emergency power unit to solve this problem.
Fire safety must guarantee achievement of the protection goals

Protection goals and equal security degree reached

The fire-protection answer offered by TÜV SÜD was agreed with each the tank farm’s operating firm, the municipal authority and the professional hearth division. The three measure packages also complied with the required safety aims and the security ranges. And in ไดอะแฟรม ซีล , they proved far more cost-effective than the solution initially proposed. Since rehabilitation of the tank farm, early fire detection at the facet of improved fire-protection infrastructure has become a central a part of injury limitation. Since the rehabilitation idea was implemented, the tank-farm’s operating company – working with the professional fireplace department – has been capable of successfully counteract all attainable eventualities of incipient fire effectively and at an early stage, even in instances of energy loss or when access to the tank farm is blocked (see Figures 2 and 3).
For more info, go to www.tuev-sued.de/is or www.dias-infrared.de

Classification under the Bavarian Building Code (Bayerische Bauordnung, BayBo)

Tank farms are installations of a special sort and use (special structures). Their operation includes the handling and storing of extremely explosive or flammable substances. Protection measures and safety precautions thus not solely fall inside the operating company’s accountability however are also a matter of public interest. Given this, the BayBO stipulates necessities including materials necessities which, as “General clauses of fire protection”, help to support the protection goals defined in Article 12. However, according to article three (1) deviations from the technical constructing laws are potential if an alternative answer is discovered that’s equal in phrases of fulfilling the general necessities in paragraph 1. In different phrases, the necessities laid down within the Building Code are deemed complied with if the commonly recognised rules of architecture and technology are fulfilled.
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