Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive hearth protection is of main significance. When rehabilitation of such a tank farm is planned, contractors usually suggest in depth – and thus pricey – measures. A fire-protection answer developed by TÜV SÜD demonstrates that an equivalent degree of safety can additionally be reached with a far more cost-effective resolution. A central position in harm limitation is performed by early fire detection using thermographic cameras.
Numerous tank farms all through Germany retailer petrol, diesel, kerosene or liquefied petroleum gas (LPG). In contact with air, these highly flammable substances can type explosive mixtures. Given this, tank farms require special measures in the field of preventive fire safety. If rehabilitation of fire-protection systems becomes necessary at an older tank farm, far-reaching measures ought to be taken, not only by the use of precaution but also to exclude attainable legal responsibility dangers. And yet not each measure that is technologically feasible is also essential in case of a rehabilitation, as can be seen from the instance of a tank farm in Bavaria, Germany.
The tank farm is positioned at a basin of a river port in Bavaria. The 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 extremely flammable fluids with flame factors of < 21 levels Celsius, as outlined within the German hazardous substances laws. In fire inspections and on-site inspections after incidents, the inspectors had recognized main non-conformities in the fire-extinguishing system. To replace the outdated and non-conforming system, an engineering agency submitted an in depth list of measures. These measures totally glad all regulatory necessities but represented a really cost-intensive answer, requiring a full rehabilitation using traditional extinguishing methods. For the tank-farm operating company, the prices of implementing these measures would have added as much as 1.7 million euros.
In fireplace safety, the problem lies in connecting well-founded technological information and authorized know-how. In practice this means harmonising reasonable engineering companies and legal purposes to acquire a cohesive, economically possible and simply applied fire-protection idea.
Alternative resolution developed by TÜV SÜD
At the operating 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 necessary to fulfil the security requirements and obtain the protection aims. They arrived at the conclusion that not all the proposed measures really wanted to be carried out. Starting from this discovering, they then drew up an alternative fire-protection concept that would in the end 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, similar to a non-automatic foam extinguishing system with a total foaming-agent provide of 10,500 litres distributed across two tanks, two submerged pumps in the port basin with a pump capability of 180 m3 per hour to ensure water provide for hearth 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 power supplier. The feed-in of emergency power was effected by the native professional hearth division.
The engineering agency, in contrast, had deliberate to replace the whole fire-extinguishing system. They wished to put in three mobile extinguishing-agent distribution techniques in container type for distant controlled sprinkling and foaming of the tanks. This resolution would have required the installation of recent electrical, operational and management techniques in addition to new pipe routes connecting the extinguishing-agent distribution systems with the fire-fighting systems within the tank fields. The prices for the three extinguishing-agent distribution systems in container kind alone would have added up to around 1.2 million euros.
Incipient hearth fighting scenario with intact energy provide and free entry to the tank farm.
Implementation of three packages of measures
The different rehabilitation concept developed by TÜV SÜD, which additionally met the necessities of the Bavarian Building Code (BayBo [1]), provided for 3 important packages of measures to realize the protection and safety aims.
First, set up of a totally automatic infrared measuring system made by DIAS Infrared to ensure early fireplace detection. The system’s seven thermographic cameras are installed on pan-tilt models. They detect changes in temperature on the surfaces of the tanks made of various materials and located in the space monitored by the cameras, earlier than these changes in temperature may cause a fireplace. As the cameras can move, the areas to be monitored could be divided into sectors. The cameras then strategy these sectors cyclically in sequence. To defend the cameras towards exterior influences, they’re housed in ventilated and heated weatherproof enclosures (Fig. 1). Monitoring focuses primarily on the protection gadgets of the tanks, pumps and motors and on the filling techniques on the tank-farm premises. The control room on the tank farm and the native skilled hearth department are notified immediately as soon because the temperature exceeds a certain limit. The measure package additionally consists of distant triggering of the extinguishing-agent supply from the management centre and automation of the safety units.
Incipient fire preventing scenario with energy loss the place access 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 answer supplied for alternative of the leaking and corroded pipe sections with new pipes and for installation of three mounted foam-extinguishing methods within the form of foam displays to struggle incipient fires directly. In addition, a cell foam monitor was deliberate as a backup.
A third focus area concerns safeguarding the facility supply required for early hearth detection and fire fighting. According to the regional vitality supplier, power outages might have a duration of at least half-hour. Given this, the tank-farm wanted an independent power provide system that was ready to ensure energy supply for at least 2 hours. The specialists relied on battery buffering and a diesel operated emergency power unit to solve this drawback.
Fire safety must guarantee achievement of the protection objectives
Protection objectives and equal security stage reached
The fire-protection answer presented by TÜV SÜD was agreed with each the tank farm’s working firm, the municipal authority and the skilled hearth division. The three measure packages also complied with the required protection objectives and the safety levels. And finally, they proved far more cost-effective than the solution initially proposed. Since rehabilitation of the tank farm, early fireplace detection along side improved fire-protection infrastructure has turn out to be a central a half of harm limitation. Since the rehabilitation idea was applied, the tank-farm’s operating firm – working with the skilled fireplace division – has been in a place to successfully counteract all attainable scenarios of incipient fireplace effectively and at an early stage, even in cases of energy loss or when entry to the tank farm is blocked (see Figures 2 and 3).
For extra data, go to www.tuev-sued.de/is or www.dias-infrared.de
Classification beneath the Bavarian Building Code (Bayerische Bauordnung, BayBo)
Tank farms are installations of a particular type and use (special structures). ราคาเกจวัดแรงดันลม includes the handling and storing of highly explosive or flammable substances. Protection measures and safety precautions thus not solely fall throughout the working company’s accountability but are additionally a matter of public curiosity. Given this, the BayBO stipulates necessities including material requirements which, as “General clauses of fireplace protection”, help to support the protection aims outlined in Article 12. However, in accordance with article three (1) deviations from the technical constructing regulations are possible if another answer is found that is equal by method of fulfilling the general necessities in paragraph 1. In different words, the requirements laid down within the Building Code are deemed complied with if the widely recognised guidelines of structure and know-how are fulfilled.
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