Improvement of preventive fire protection at a tank farm

Tank farms are used for the storage of extremely flammable and explosive substances; Consequently, preventive fire protection is of major significance. When rehabilitation of such a tank farm is planned, contractors often recommend in depth – and thus pricey – measures. เกจวัดแรงดัน250bar -protection solution developed by TÜV SÜD demonstrates that an equivalent stage of safety can be reached with a a lot more cost-effective resolution. A central function in damage limitation is played by early hearth detection utilizing thermographic cameras.
Numerous tank farms throughout Germany retailer 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 fire safety. If rehabilitation of fire-protection systems becomes essential at an older tank farm, far-reaching measures should be taken, not only by means of precaution but additionally to exclude possible liability risks. And but not each measure that’s technologically possible is also needed in case of a rehabilitation, as can be seen from the example of a tank farm in Bavaria, Germany.
The tank farm is located at a basin of a river port in Bavaria. The a part of the tank farm in need 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 factors of < 21 levels Celsius, as outlined within the German hazardous substances legislation. In fireplace inspections and on-site inspections after incidents, the inspectors had recognized major non-conformities within the fire-extinguishing system. To replace the outdated and non-conforming system, an engineering agency submitted an extensive list of measures. These measures fully satisfied all regulatory requirements however represented a really cost-intensive answer, requiring a full rehabilitation utilizing traditional extinguishing techniques. For the tank-farm operating company, the prices of implementing these measures would have added as a lot as 1.7 million euros.
In fire safety, the problem lies in connecting well-founded technological data and legal know-how. In practice this means harmonising cheap engineering providers and legal functions to obtain a cohesive, economically possible and easily implemented fire-protection idea.
Alternative answer developed by TÜV SÜD

At the working company’s request, TÜV SÜD’s third-party consultants validated the individual measures and the cost-effectiveness of the rehabilitation plan submitted by the engineering firm. Owing to the large variety of deficiencies identified within the tank farm, the experts first ready a list of priorities with the measures essential to fulfil the safety necessities and obtain the safety objectives. They arrived on the conclusion that not all of the proposed measures really wanted to be applied. Starting from this discovering, they then drew up an alternate fire-protection concept that would ultimately scale back the projected costs by one third.
TÜV SÜD’s rehabilitation plan included the fire-protection infrastructure already in place at the tank farm, corresponding to a non-automatic foam extinguishing system with a complete foaming-agent provide of 10,500 litres distributed across two tanks, two submerged pumps in the port basin with a pump capability of a hundred and eighty m3 per hour to ensure water supply for hearth preventing and sprinkling the shells and the roofs of the tanks, guide triggering of the shut-off valves and a transformer station powered by the regional vitality supplier. The feed-in of emergency power was effected by the native professional fireplace department.
The engineering agency, by contrast, had planned to exchange the complete fire-extinguishing system. They wished to put in three cellular extinguishing-agent distribution systems in container kind for distant managed sprinkling and foaming of the tanks. This solution would have required the set up of recent electrical, operational and management methods in addition to 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 methods in container type alone would have added up to around 1.2 million euros.
Incipient fireplace preventing situation with intact power supply 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 requirements of the Bavarian Building Code (BayBo [1]), supplied for 3 important packages of measures to realize the safety and security objectives.
First, set up of a completely automatic infrared measuring system made by DIAS Infrared to make sure early fireplace detection. The system’s seven thermographic cameras are put in on pan-tilt items. They detect changes in temperature at the surfaces of the tanks made of different materials and situated within the area monitored by the cameras, before these adjustments in temperature could cause a hearth. As the cameras can move, the areas to be monitored can be divided into sectors. The cameras then approach these sectors cyclically in sequence. To defend the cameras against 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 systems on the tank-farm premises. The control room on the tank farm and the local skilled hearth department are notified instantly as soon because the temperature exceeds a certain limit. The measure package also includes remote triggering of the extinguishing-agent supply from the management centre and automation of the safety devices.
Incipient hearth combating state of affairs with energy 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 solution supplied for alternative of the leaking and corroded pipe sections with new pipes and for set up of three fastened foam-extinguishing methods in the type of foam screens to struggle incipient fires immediately. In addition, a cellular foam monitor was deliberate as a backup.
A third focus area concerns safeguarding the facility provide required for early fireplace detection and hearth preventing. According to the regional power provider, power outages could have a length of no much less than 30 minutes. Given this, the tank-farm needed an unbiased power supply system that was able to make sure power provide for a minimum of 2 hours. The consultants relied on battery buffering and a diesel operated emergency power unit to resolve this problem.
Fire safety must ensure achievement of the safety objectives

Protection goals and equal safety stage reached

The fire-protection resolution presented by TÜV SÜD was agreed with each the tank farm’s working company, the municipal authority and the professional hearth department. The three measure packages additionally complied with the required safety goals and the security levels. And in the end, they proved far more cost-effective than the solution initially proposed. Since rehabilitation of the tank farm, early fireplace detection at the side of improved fire-protection infrastructure has become a central a part of harm limitation. Since the rehabilitation concept was implemented, the tank-farm’s operating company – working with the skilled hearth division – has been able to effectively counteract all potential eventualities of incipient fireplace successfully 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).
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Classification underneath the Bavarian Building Code (Bayerische Bauordnung, BayBo)

Tank farms are installations of a particular sort and use (special structures). Their operation involves the handling and storing of highly explosive or flammable substances. Protection measures and safety precautions thus not only fall inside the working company’s accountability but are also a matter of public interest. Given this, the BayBO stipulates requirements together with materials necessities which, as “General clauses of fire protection”, help to support the safety objectives outlined in Article 12. However, in accordance with article 3 (1) deviations from the technical building laws are potential if an alternative solution is discovered that is equal in terms of fulfilling the overall necessities in paragraph 1. In other phrases, the necessities laid down within the Building Code are deemed complied with if the generally recognised guidelines of structure and technology are fulfilled.

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