Improvement of preventive hearth safety at a tank farm

Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive fireplace protection is of major importance. When rehabilitation of such a tank farm is planned, contractors often advocate extensive – and thus pricey – measures. A fire-protection answer developed by TÜV SÜD demonstrates that an equal degree of safety can be reached with a far more cost-effective resolution. A central function in injury limitation is played by early fire detection using thermographic cameras.
Numerous tank farms throughout Germany store petrol, diesel, kerosene or liquefied petroleum gasoline (LPG). In contact with air, these extremely flammable substances can type explosive mixtures. Given this, tank farms require special measures in the field of preventive fireplace protection. If rehabilitation of fire-protection systems turns into needed at an older tank farm, far-reaching measures ought to be taken, not solely by means of precaution but in addition to exclude potential legal responsibility dangers. And yet not each measure that is technologically feasible can additionally be needed in case of a rehabilitation, as can be seen from the example of a tank farm in Bavaria, Germany.
The tank farm is positioned 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 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 degrees Celsius, as outlined within the German hazardous substances legislation. In hearth inspections and on-site inspections after incidents, the inspectors had recognized main non-conformities within the fire-extinguishing system. To replace the outdated and non-conforming system, an engineering firm submitted an intensive list of measures. These measures absolutely glad all regulatory requirements however represented a very cost-intensive solution, requiring a full rehabilitation using conventional extinguishing systems. For the tank-farm operating company, the costs 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 follow this means harmonising affordable engineering providers and legal purposes to obtain a cohesive, economically feasible and simply implemented fire-protection concept.
Alternative solution 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 firm. Owing to the massive variety of deficiencies recognized within the tank farm, the experts first prepared an inventory of priorities with the measures necessary to fulfil the protection necessities and achieve the protection objectives. They arrived on the conclusion that not all the proposed measures truly wanted to be carried out. Starting from this discovering, they then drew up another fire-protection idea that would in the end reduce 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 total foaming-agent supply of 10,500 litres distributed across two tanks, two submerged pumps within the port basin with a pump capacity of one hundred eighty m3 per hour to ensure water provide for fireplace combating 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 power was effected by the native skilled fireplace department.
The engineering agency, against this, had deliberate to replace the whole fire-extinguishing system. They needed to install three mobile extinguishing-agent distribution techniques in container kind for remote managed sprinkling and foaming of the tanks. This solution would have required the set up of latest electrical, operational and control methods in addition to new pipe routes connecting the extinguishing-agent distribution systems with the fire-fighting systems within the tank fields. เกจวัดแรงดันเชื้อเพลิง for the three extinguishing-agent distribution methods in container type alone would have added up to round 1.2 million euros.
Incipient fireplace fighting state of affairs with intact power provide and free entry to the tank farm.
Implementation of three packages of measures
The various rehabilitation idea developed by TÜV SÜD, which additionally met the requirements of the Bavarian Building Code (BayBo [1]), provided for three important packages of measures to attain the protection and security goals.
First, set up of a completely computerized infrared measuring system made by DIAS Infrared to make sure early fire detection. The system’s seven thermographic cameras are installed on pan-tilt items. They detect modifications in temperature at the surfaces of the tanks made of different supplies and positioned in the area monitored by the cameras, before these adjustments in temperature can cause a fire. As the cameras can move, the areas to be monitored could be divided into sectors. The cameras then method 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 safety units of the tanks, pumps and motors and on the filling techniques on the tank-farm premises. The control room at the tank farm and the native skilled fire department are notified immediately as quickly because the temperature exceeds a sure limit. The measure bundle also contains distant triggering of the extinguishing-agent supply from the management centre and automation of the protection gadgets.
Incipient hearth fighting state of affairs 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 solution supplied for substitute of the leaking and corroded pipe sections with new pipes and for set up of three fixed foam-extinguishing systems within the form of foam screens to battle incipient fires directly. In addition, a mobile foam monitor was deliberate as a backup.
A third focus space issues safeguarding the ability supply required for early fire detection and fire fighting. According to the regional power provider, power outages might have a period of a minimum of 30 minutes. Given this, the tank-farm needed an independent energy supply system that was in a position to make sure energy provide for at least 2 hours. The experts relied on battery buffering and a diesel operated emergency power unit to resolve this downside.
Fire safety should guarantee achievement of the protection goals
Protection objectives and equal safety level reached
The fire-protection answer offered by TÜV SÜD was agreed with both the tank farm’s operating firm, the municipal authority and the professional fire division. The three measure packages additionally complied with the required safety goals and the protection ranges. And in the end, they proved far less expensive than the solution initially proposed. Since rehabilitation of the tank farm, early fire detection at the side of improved fire-protection infrastructure has become a central a half of injury limitation. Since the rehabilitation concept was applied, the tank-farm’s operating company – working with the skilled fire division – has been able to effectively counteract all possible eventualities of incipient fireplace successfully and at an early stage, even in circumstances of power loss or when entry to the tank farm is blocked (see Figures 2 and 3).
For extra 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 particular type and use (special structures). Their operation includes the dealing with and storing of highly explosive or flammable substances. Protection measures and security precautions thus not only fall within the working company’s accountability but are also a matter of public curiosity. Given this, the BayBO stipulates necessities including materials necessities which, as “General clauses of fireplace protection”, assist to assist the protection aims outlined in Article 12. However, in accordance with article 3 (1) deviations from the technical building rules are possible if an alternate solution is found that is equivalent in phrases of fulfilling the overall necessities in paragraph 1. In different phrases, 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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