FAQs Archive - Page 4 of 4

Did the manufacturer predict the possibility of the beam’s design / manufacture with intumescent paint coatings suitable to extremely low critical temperatures for the main structure – e.g. 350 ° C – in case of the need to increase the fire load for a part of the building?

26 August 2021HBadmin

Answers to this question can be found in Annexes 1, 7 and 8.

What temperature has been proved for the main steel structure of the building while calculating the intumescent paint coatings on the beams – is this dependent on the massiveness of the section (the section factor), utilization of the section, the thickness of the flange, etc.? Will the economical slimming down of the lower flange’s thickness not result in the non-fulfilment of Technical Approval (or ETA) for the indicated intumescent paint coatings or will it be necessary to apply excessive and irrational thicknesses of the intumescent paint coatings (under the assumption REI120 for beams)?

26 August 2021HBadmin

Answers to this question can be found in annexes 1, 7, and 8.

Can you drill in the beam’s bottom flange? If so, by what rules?

26 August 2021HBadmin

Drilling in the bottom flange of PFEIFER Hybridbeam® requires the repair of the fire protection coating. It is prohibited to drill in the area of the HC slabs’ support, due to possible damage of the pre-stressing strands. Each potential drilling must always be approved by the designer from PFEIFER Hybridbeam®.

What is the estimated cost of producing the intumescent coatings – which means how much higher will the real cost of finished beams be?

26 August 2021HBadmin

The cost of making the intumescent coating is included in the price of the PFEIFER Hybridbeams®.

Who designs the PFEIFER Hybridbeam®?

26 August 2021HBadmin

PFEIFER Hybridbeams® are designed in accordance with the requirements specified in the reference documents. Calculations and workshop documentation of Hybridbeams is realized by the manufacturer’s structural design office; the execution documentation is made by the object’s structural designer in cooperation with the manufacturer’s designers.

How is the load capacity ensured during installation? How to support the beams? What about potential damage to the fire paint coating?

26 August 2021HBadmin

Determining the load capacity during installation is part of the beam’s calculations. In a standard situation, the PFEIFER-Hybridbeams don’t need to be supported during installation, which is checked by calculation. If a temporary support is required as a result of the calculations, an appropriate recommendation for the assembly company is included in the installation plan […]

Which way are the beams protected with undercoat anti- corrosion paint? Is this correct according to the fire protection systems aforementioned in question No.1? What is the thickness of the undercoat paint? Is the beam’s manufacturer authorized to make undercoat paint under for the intumescent paint coatings system?

26 August 2021HBadmin

This is due to Technical Approval and ETA. The undercoat paint is made according to the guidelines of the manufacturer of the intumescent paint coatings and supplied by them. The durability of the coating was specified in the Carboline formal letter (Annex No. 9). The manufacturer of PFEIFER-Hybridbeams has been trained in the field of […]

Does the supplier intend to paint the beams in the production plant? If so, how will they be repainted / repaired after the damage of intumescent paint coating during transport / assembly / concreting / removing adjustable steel columns – according to what “repair program”? How does this relate to the weather conditions (structure that is exposed to water, frost etc.)?

26 August 2021HBadmin

The first part of the question – see answer here. Any repairs to the damage in the intumescent coating are done by specialized workers of the beam’s manufacturer according to his own technology. The influence of the weather conditions on the durability of the intumescent coating is specified by the paint manufacturer.

Where can you find unambiguous guidelines for the correct execution of the intumescent paint coatings, i.e. who designs the paint coating with fire resistance, what thicknesses are usually required, how to protect the coating against damage during concreting (in the upper surface area of the bottom flange)?

26 August 2021HBadmin

See: Extract from the Polish National Technical Assessment (Krajowa Ocena Techniczna – KOT). The paint coating is part of the beam’s production process and is carried out in our production plant in Krępice near Wroclaw, Poland in a professional chamber in accordance with the instructions and guidelines of the paint manufacturer. Concreting of the beam […]