Teknos' sales team found a solution to avoiding weeks of traffic disruption in central Stockholm caused by a construction site: using the correct intumescent coating for steel structures sped up the construction process remarkably.
Over the next five years, some of central Stockholm's old buildings will undergo renovation. The construction site offices installed for the duration of the work needed durable fire protection. By using Teknos intumescent coatings, it was possible to avoid installing fire boards – which would have taken three to four weeks – and to start construction earlier thereby minimizing the disruption caused to the city and its traffic and reducing excess costs.
Over the next half-decade some of the old buildings surrounding the Sergels torg square in central Stockholm are scheduled for renovation. The lengthy renovation project for some of the old buildings surrounding the Sergels torg square requires the construction site office to be lifted into the air so that they do not disrupt traffic. This will be achieved by building steel structures to support the office. For safety reasons, the structures must be protected from fires to ensure that the steel cannot heat up and suffer a loss of strength in the event of a fire. Structures are protected using products such as intumescent coatings or fire boards.
The load-bearing steel structures for the Stockholm site offices project were required to have a fire resistance class of R60. This class means that the structure must be able to withstand a fire for 60 minutes, which is estimated to be enough time to evacuate everyone. Furthermore, the coating system needed a corrosion protection class of C3, which is suitable for protecting structures from corrosion in urban environments.
In the first phase of the project, a single-coat epoxy paint was selected for corrosion protection. When the steel structure was installed, it was protected using fire boards. The structure met the requirements, but installing the fire boards meant using scaffolds for a period of three or four weeks. The installation caused major disruption to traffic in the area.
An intumescent coating had been an option from the very start of the project, but it was not chosen because the paint under consideration took far too long to dry and the paint shop could not manage the capacity it demanded for such large amounts of materials.
At just the right moment before the final phase of the project, the client consulted Teknos, and Business Development Manager Jan Nordmark offered an alternative intumescent coating. The paint in question was Hensotherm 910 KS, a solvent-free coating with an R60 fire protection class and a C3 corrosion protection class. As this paint dries in 24 hours, the paint shop was able to work efficiently and the steel structures were put in place quickly. Therefore, the construction project could start 3-4 weeks earlier.
The steel structures are now complete and the renovation project is in full swing. The customer is highly satisfied with the project. It has been a great success for everyone involved.
"If you ask me or Jan, our Teknos contact person, this is one of most fun projects currently underway. If we had used a conventional fire protection, we would never have been able to handle the deliveries on time due to the different panelling method and longer drying times. These are areas where Teknos' paint really stands out," says ProChroma's Björn Stam.
Business Development Manager - Fire Protection
Tel. +46 325 61 95 00
"If we had used a conventional steel fire protection, we would never have been able to handle the deliveries on time due to the different panelling method and longer drying times. These are areas where Teknos' paint really stands out"
Björn Stam, ProChroma
Hensotherm 910 KS has a corrosion protection class of C3, which is suitable for protecting structures from corrosion in urban environments. For achieving corrosion protection class of C5 (very humid climates) TEKNOPLAST PRIMER 5 should be used as a primer with Hensotherm 910 KS.
Teknos Hensotherm 910 KS guarantees a quick lead time, transportation and installation. The most important properties are short curing time and that no base coat is needed, only one layer of paint is enough. Therefore, short lead times and delivery the following day are possible. Due to the paint's durability is does not suffer from damage during transportation. When coated steel arrives to the construction site, it can be installed at once.
Steel stands have been erected in an area of over 6,000 square meters (1.5 acres), and 400 construction site offices have been fitted to the stands above ground level.
ProChroma, Sweden, has supplied the customer with approximately 16 tons of intumescent coating.
On the first day, the first batch of parts is coated. On the second day, the parts are inspected and additional coatings may be applied before the parts are collected and coatings of the next batch can begin. The coating is a dual-component paint applied at a temperature of 35–40°C. The minimum recommended spray pressure is 400 bar. At least two people are required to carry out the painting work. One person paints while the other is responsible for the tools and for mixing the paint. This is mainly due to the paint's usage time, which is less than 60 minutes. A single layer of paint is applied with a thickness of 2 mm, and this is inspected by taking a wet film measurement.