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Improvement of preventive fire protection at a tank farm

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Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive fire safety is of major importance. When rehabilitation of such a tank farm is planned, contractors usually advocate in depth – and thus costly – measures. A fire-protection resolution developed by TÜV SÜD demonstrates that an equivalent degree of safety can also be reached with a a lot more cost-effective answer. A central position in injury limitation is played by early fire detection using thermographic cameras.
ไดอะแฟรม ซีล through Germany store petrol, diesel, kerosene or liquefied petroleum gasoline (LPG). In contact with air, these extremely flammable substances can kind explosive mixtures. Given this, tank farms require particular measures in the area of preventive hearth protection. If rehabilitation of fire-protection methods turns into needed at an older tank farm, far-reaching measures must be taken, not only by means of precaution but additionally to exclude possible liability risks. And yet not each measure that is technologically feasible can be needed in case of a rehabilitation, as could be seen from the example of a tank farm in Bavaria, Germany.
The tank farm is situated at a basin of a river port in Bavaria. The a half of the tank farm in need of rehabilitation covers 24 tanks with a storage volume of between 600 and a pair of,000 cubic metres. The tank farm is used for intermediate storage of extremely flammable fluids with flame factors of < 21 degrees Celsius, as outlined within the German hazardous substances laws. In fire 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 To exchange the outdated and non-conforming system, an engineering firm submitted an in depth record of measures. These measures fully glad all regulatory requirements however represented a very cost-intensive resolution, requiring a full rehabilitation using traditional extinguishing methods. For the tank-farm working company, the costs of implementing these measures would have added as much as 1.7 million euros.
In hearth protection, the problem lies in connecting well-founded technological knowledge and authorized know-how. In apply this means harmonising reasonable engineering services and authorized functions to acquire a cohesive, economically possible and simply carried out fire-protection concept.
Alternative solution developed by TÜV SÜD

At the working company’s request, TÜV SÜD’s third-party specialists validated the individual measures and the cost-effectiveness of the rehabilitation plan submitted by the engineering firm. Owing to the big number of deficiencies recognized in the tank farm, the specialists first prepared a list of priorities with the measures essential to fulfil the safety requirements and obtain the safety aims. They arrived on the conclusion that not all the proposed measures actually wanted to be carried out. Starting from this finding, they then drew up an alternate fire-protection idea that would ultimately cut back the projected prices by one third.
TÜV SÜD’s rehabilitation plan included the fire-protection infrastructure already in place on the tank farm, such as a non-automatic foam extinguishing system with a complete foaming-agent provide of 10,500 litres distributed throughout two tanks, two submerged pumps in the port basin with a pump capacity of 180 m3 per hour to make sure water provide for fire preventing and sprinkling the shells and the roofs of the tanks, handbook triggering of the shut-off valves and a transformer station powered by the regional energy supplier. The feed-in of emergency energy was effected by the native professional hearth department.
The engineering agency, against this, had planned to replace the complete fire-extinguishing system. They needed to put in three cellular extinguishing-agent distribution systems in container type for remote managed sprinkling and foaming of the tanks. This solution would have required the installation of new electrical, operational and management systems as well as new pipe routes connecting the extinguishing-agent distribution methods with the fire-fighting systems in the tank fields. The costs for the three extinguishing-agent distribution methods in container kind alone would have added as much as round 1.2 million euros.
Incipient fire combating state of affairs with intact energy supply and free entry to the tank farm.
Implementation of three packages of measures

The alternative rehabilitation idea developed by TÜV SÜD, which additionally met the necessities of the Bavarian Building Code (BayBo [1]), provided for three essential packages of measures to realize the safety and security aims.
First, installation of a totally automatic infrared measuring system made by DIAS Infrared to ensure early hearth detection. The system’s seven thermographic cameras are put in on pan-tilt models. They detect modifications in temperature on the surfaces of the tanks made of different supplies and located within the space monitored by the cameras, earlier than these adjustments in temperature may cause a fire. As the cameras can move, the areas to be monitored may be divided into sectors. The cameras then method these sectors cyclically in sequence. To protect the cameras towards external influences, they’re housed in ventilated and heated weatherproof enclosures (Fig. 1). Monitoring focuses primarily on the safety devices of the tanks, pumps and motors and on the filling methods on the tank-farm premises. The control room at the tank farm and the local skilled hearth department are notified immediately as soon as the temperature exceeds a certain limit. The measure bundle additionally includes remote triggering of the extinguishing-agent provide from the management centre and automation of the security devices.
Incipient fireplace combating situation with power loss where entry to the tank farm is blocked by a cargo prepare.
In addition, it covers rehabilitation of the sprinkler and foam-extinguisher system. In this context, TÜV SÜD’s solution supplied for alternative of the leaking and corroded pipe sections with new pipes and for installation of three fastened foam-extinguishing techniques in the form of foam displays to battle incipient fires immediately. In addition, a cellular foam monitor was deliberate as a backup.
A third focus space considerations safeguarding the facility provide required for early fireplace detection and fireplace combating. According to the regional power supplier, power outages might have a duration of at least half-hour. Given this, the tank-farm wanted an independent power supply system that was ready to ensure energy provide for no much less than 2 hours. The specialists relied on battery buffering and a diesel operated emergency energy unit to solve this drawback.
Fire safety must ensure achievement of the safety objectives

Protection aims and equal safety 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 fireplace division. The three measure packages also complied with the required protection objectives and the protection ranges. And ultimately, they proved far less expensive than the solution initially proposed. Since rehabilitation of the tank farm, early hearth detection in conjunction with improved fire-protection infrastructure has become a central a half of harm limitation. Since the rehabilitation concept was applied, the tank-farm’s working company – working with the professional fireplace department – has been in a place to successfully counteract all possible eventualities of incipient hearth 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 extra information, 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 particular type and use (special structures). Their operation involves the dealing with and storing of extremely explosive or flammable substances. Protection measures and safety precautions thus not only fall throughout the operating company’s responsibility however are additionally a matter of public interest. Given this, the BayBO stipulates necessities including materials necessities which, as “General clauses of fireplace protection”, help to assist the safety objectives outlined in Article 12. However, based on article 3 (1) deviations from the technical building regulations are possible if another resolution is found that is equal in phrases of fulfilling the final necessities in paragraph 1. In other phrases, the requirements laid down in the Building Code are deemed complied with if the commonly recognised rules of structure and technology are fulfilled.
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