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Improvement of preventive fire safety at a tank farm

Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive fireplace protection is of main significance. When rehabilitation of such a tank farm is deliberate, contractors often suggest extensive – and thus costly – 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 role in injury limitation is played by early hearth 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 kind explosive mixtures. Given this, tank farms require particular measures in the subject of preventive fireplace safety. If rehabilitation of fire-protection techniques becomes needed at an older tank farm, far-reaching measures should be taken, not only by the use of precaution but additionally to exclude attainable liability dangers. And yet not every measure that is technologically feasible can be essential in case of a rehabilitation, as could 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 part of the tank farm in want 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 highly 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 major non-conformities in the fire-extinguishing system. To replace the outdated and non-conforming system, an engineering agency submitted an intensive list of measures. These measures totally glad all regulatory necessities but represented a very cost-intensive solution, requiring a full rehabilitation utilizing traditional extinguishing systems. For the tank-farm working firm, the costs of implementing these measures would have added as a lot as 1.7 million euros.
In fireplace safety, the challenge lies in connecting well-founded technological information and authorized know-how. In follow this implies harmonising reasonable engineering services and legal purposes to obtain a cohesive, economically possible and simply carried out fire-protection idea.
Alternative solution 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 massive variety of deficiencies recognized within the tank farm, the specialists first ready a list of priorities with the measures essential to fulfil the security requirements and achieve the safety objectives. They arrived on the conclusion that not the entire proposed measures actually needed to be carried out. Starting from this finding, they then drew up an alternate fire-protection concept that may 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, similar 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 one hundred eighty m3 per hour to ensure water provide 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 power supplier. The feed-in of emergency energy was effected by the native professional fire division.
The engineering firm, against this, had planned to switch the complete fire-extinguishing system. They wanted to put in three mobile extinguishing-agent distribution systems in container kind for remote controlled sprinkling and foaming of the tanks. This answer would have required the set up of recent electrical, operational and management systems as properly as new pipe routes connecting the extinguishing-agent distribution techniques with the fire-fighting methods in the tank fields. The prices for the three extinguishing-agent distribution systems in container type alone would have added up to round 1.2 million euros.
Incipient fire fighting situation with intact power supply and free entry to the tank farm.
Implementation of three packages of measures
The different rehabilitation concept developed by TÜV SÜD, which also met the necessities of the Bavarian Building Code (BayBo [1]), offered for 3 essential packages of measures to achieve the protection and security goals.
First, set up of a totally computerized infrared measuring system made by DIAS Infrared to make sure early fire detection. The system’s seven thermographic cameras are put in on pan-tilt units. They detect modifications in temperature at the surfaces of the tanks made of different supplies and situated in the space monitored by the cameras, before these modifications in temperature may cause a fireplace. As the cameras can transfer, the areas to be monitored can be divided into sectors. The cameras then strategy these sectors cyclically in sequence. To protect the cameras against external influences, they are housed in ventilated and heated weatherproof enclosures (Fig. 1). Monitoring focuses totally on the security gadgets of the tanks, pumps and motors and on the filling systems on the tank-farm premises. The control room at the tank farm and the local professional fireplace division are notified instantly as soon because the temperature exceeds a sure restrict. The measure bundle also includes remote triggering of the extinguishing-agent supply from the control centre and automation of the protection units.
Incipient hearth fighting scenario with energy loss the place entry to the tank farm is blocked by a cargo practice.
In addition, it covers rehabilitation of the sprinkler and foam-extinguisher system. In this context, TÜV SÜD’s resolution provided for alternative of the leaking and corroded pipe sections with new pipes and for set up of three mounted foam-extinguishing techniques in the type of foam displays to fight incipient fires instantly. 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 provider, energy outages might have a duration of a minimal of 30 minutes. Given this, the tank-farm needed an independent energy provide system that was in a position to ensure energy supply for a minimum of 2 hours. The consultants relied on battery buffering and a diesel operated emergency power unit to resolve this problem.
Fire protection must ensure achievement of the protection aims
Protection objectives and equal safety stage reached
The fire-protection resolution presented by TÜV SÜD was agreed with both the tank farm’s operating company, the municipal authority and the skilled fireplace department. The three measure packages also complied with the required protection goals and the safety levels. And ultimately, they proved far cheaper than the answer initially proposed. Since rehabilitation of the tank farm, early fire detection at the facet of improved fire-protection infrastructure has become a central part of damage limitation. Since the rehabilitation idea was implemented, the tank-farm’s working firm – working with the professional fire department – has been capable of successfully counteract all attainable scenarios of incipient fire effectively and at an early stage, even in cases of power loss or when access 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 kind and use (special structures). Their operation includes the dealing with and storing of extremely explosive or flammable substances. Protection measures and safety precautions thus not solely fall throughout the working company’s duty however are additionally a matter of public interest. Given ขนาดpressuregauge , the BayBO stipulates necessities including materials requirements which, as “General clauses of fire protection”, assist to assist the protection objectives outlined in Article 12. However, based on เกจวัดแรงดันsumo (1) deviations from the technical constructing laws are possible if another answer is found that is equivalent by method of fulfilling the overall requirements in paragraph 1. In different phrases, the necessities laid down in the Building Code are deemed complied with if the widely recognised guidelines of structure and know-how are fulfilled.