Improvement of preventive fireplace protection at a tank farm

Tank farms are used for the storage of highly flammable and explosive substances; Consequently, preventive fire protection is of major importance. When rehabilitation of such a tank farm is deliberate, contractors often advocate intensive – and thus costly – measures. A fire-protection answer developed by TÜV SÜD demonstrates that an equivalent stage of safety can also be reached with a a lot more cost-effective answer. A central function in injury 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 highly flammable substances can type explosive mixtures. Given this, tank farms require special measures within the field of preventive hearth protection. If rehabilitation of fire-protection systems turns into essential at an older tank farm, far-reaching measures ought to be taken, not solely by method of precaution but also to exclude attainable liability dangers. And yet not each measure that’s technologically possible can also be necessary in case of a rehabilitation, as may be seen from the instance 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 want 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 points of < 21 levels Celsius, as outlined within the German hazardous substances laws. In hearth 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 To exchange the outdated and non-conforming system, an engineering agency submitted an extensive list of measures. These measures fully happy all regulatory requirements but represented a really cost-intensive answer, requiring a full rehabilitation utilizing traditional extinguishing methods. For the tank-farm working company, the prices of implementing these measures would have added as much as 1.7 million euros.
In fire safety, the challenge lies in connecting well-founded technological data and legal know-how. In practice this implies harmonising reasonable engineering providers and legal purposes to acquire a cohesive, economically possible and simply implemented fire-protection idea.
Alternative resolution developed by TÜV SÜD
At the operating company’s request, TÜV SÜD’s third-party consultants validated the person measures and the cost-effectiveness of the rehabilitation plan submitted by the engineering agency. Owing to the big variety of deficiencies recognized within the tank farm, the specialists first prepared a listing of priorities with the measures essential to fulfil the safety requirements and achieve the protection goals. They arrived at the conclusion that not the entire proposed measures truly wanted to be implemented. Starting from this discovering, they then drew up an alternate fire-protection idea that may in the end cut 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 total foaming-agent provide of 10,500 litres distributed throughout two tanks, two submerged pumps within the port basin with a pump capability of one hundred eighty m3 per hour to make sure water supply for fire fighting 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 vitality provider. The feed-in of emergency energy was effected by the native skilled fire division.
The engineering firm, in contrast, had planned to replace the entire fire-extinguishing system. They wished to put in three cellular extinguishing-agent distribution systems in container type for remote managed sprinkling and foaming of the tanks. This resolution would have required the set up of latest electrical, operational and control methods as properly as new pipe routes connecting the extinguishing-agent distribution techniques with the fire-fighting systems within the tank fields. The prices for the three extinguishing-agent distribution techniques in container kind alone would have added as a lot as around 1.2 million euros.
Incipient fireplace combating scenario with intact power provide and free entry to the tank farm.
Implementation of three packages of measures
The alternative rehabilitation idea developed by TÜV SÜD, which also met the necessities of the Bavarian Building Code (BayBo [1]), provided for 3 important packages of measures to achieve the protection and safety aims.
First, installation of a totally automatic infrared measuring system made by DIAS Infrared to ensure early fire detection. The system’s seven thermographic cameras are installed on pan-tilt models. They detect changes in temperature at the surfaces of the tanks made of different supplies and situated in the area monitored by the cameras, earlier than these changes in temperature can cause a fire. 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 protect the cameras in opposition to exterior influences, they are housed in ventilated and heated weatherproof enclosures (Fig. 1). Monitoring focuses totally on the protection 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 native skilled hearth department are notified immediately as quickly because the temperature exceeds a certain limit. The measure package deal also consists of distant triggering of the extinguishing-agent provide from the control centre and automation of the protection gadgets.
Incipient fire combating state of affairs 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 provided for substitute of the leaking and corroded pipe sections with new pipes and for set up of three fixed foam-extinguishing systems within the type of foam monitors to fight incipient fires directly. In addition, a mobile foam monitor was deliberate as a backup.
A third focus space considerations safeguarding the ability supply required for early fireplace detection and fire fighting. According to the regional vitality provider, energy outages might have a duration of a minimum of half-hour. Given this, the tank-farm wanted an impartial power supply system that was in a position to ensure power provide for at least 2 hours. The consultants relied on battery buffering and a diesel operated emergency energy unit to resolve this problem.
Fire safety must ensure achievement of the safety objectives
Protection objectives and equivalent safety degree reached
The fire-protection solution introduced by TÜV SÜD was agreed with both the tank farm’s working company, the municipal authority and the professional fire department. The three measure packages also complied with the required safety goals and the safety ranges. And finally, they proved far more cost-effective than the answer initially proposed. Since rehabilitation of the tank farm, early fireplace detection in conjunction with improved fire-protection infrastructure has turn into a central part of injury limitation. Since the rehabilitation idea was applied, the tank-farm’s working company – working with the professional hearth division – has been in a place to effectively counteract all attainable eventualities of incipient fire effectively 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 information, go to www.tuev-sued.de/is or www.dias-infrared.de
Classification underneath the Bavarian Building Code (Bayerische Bauordnung, BayBo)
Tank farms are installations of a special type and use (special structures). Their operation includes the dealing with and storing of highly explosive or flammable substances. Protection measures and safety precautions thus not solely fall within the operating company’s accountability but are also a matter of public curiosity. Given this, the BayBO stipulates requirements including materials necessities which, as “General clauses of fire protection”, help to help the safety aims defined in Article 12. However, based on pressure gauge หน้าปัด 4 นิ้ว (1) deviations from the technical building laws are attainable if an alternative answer is discovered that’s equal when it comes to fulfilling the final necessities in paragraph 1. In other words, the requirements laid down in the Building Code are deemed complied with if the commonly recognised rules of architecture and technology are fulfilled.
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