Why are fire extinguisher pipes not insulated?

Fire protection upgrading of fire extinguishing and sprinkler lines

In the event of a fire, they play an important role in protecting people inside a building: sprinkler and fire extinguishing systems. To ensure that they do their job reliably and efficiently in extreme situations, DIN 14462: 2012-09 regulates the planning, installation, operation and maintenance of fire extinguishing pipes in great detail. For safe and easy compliance with fire protection requirements, Paul Giele and his specialist company in Dresden rely on system solutions.

In April 2018, the "partial replacement building for geriatrics - west wing" was put into operation in the St. Joseph-Stift in Dresden. Among other things, it houses an acute geriatric unit and a modern, cross-clinic central outpatient department. Image: Deutsche Rockwool GmbH & Co. KG

In the extension of the St. Joseph-Stift hospital in Dresden, Giele and his team were responsible for the installation of piping systems for heating and plumbing as well as the installation of fire extinguishing lines, the insulation of the technical systems, various fire protection measures and the cladding of fire extinguishing lines.

“In total, we clad around 6,200 meters of cable with non-flammable rock wool. We used pipe sections for thermal insulation, the 'Rockwool 800' and 'Conlit' fire protection systems. We created the otherwise time-consuming cladding of pipe bends and pipe coupling elements of the sprinkler lines with the 'Conlit' system for the first time. Thanks to the prefabricated molded parts, we saved a lot of time, ”sums up construction manager Paul Giele.

The “Conlit” system solution was specially developed for cladding sprinkler and fire extinguishing lines. The pre-assembled insulation components adapt to the geometries of the most common pipe dimensions. Image: Deutsche Rockwool GmbH & Co. KG

Requirements for fire protection on extinguishing water and sprinkler pipes

According to DIN 14462: 2012-09, fire extinguishing lines must generally be non-flammable. Dry extinguishing water pipes that are routed through sections or rooms that are not protected by automatic extinguishing systems and in which there are fire loads must also be clad in fire-resistant F 90. The DIN says: “If extinguishing water pipes have to be routed 'dry' through sections or rooms in which there are fire loads, these pipes must be clad in a fire-resistant manner. This is not necessary for rooms that are protected by automatic extinguishing systems. ”In addition, the guideline for sprinkler systems VdS CEA 4001: 2014-04 under point 15.1.8 requires that sprinkler lines be routed through buildings and rooms in which no sprinklers are available including their mounting must be at least fire-resistant (F 90).

Everything fits together

The fact that Giele's team was able to carry out all the pending insulation and fire protection tasks with similar or even identical systems confirmed the specialist's decision for the supplier . In addition to the processing advantages, their use has two advantages: The insulation shells are non-flammable and can therefore also be used in sensitive areas such as escape routes without additional fire protection measures. In addition, the manufacturer offers a coordinated, Conlit ’system solution especially for the sealing of pipe systems in fire-resistant walls and ceilings. So we were able to use various insulation and fire protection components from our preferred manufacturer, whose systems we have known for years and who supported us in planning the installation process and determining the amount of material. "

The pre-assembled 'Conlit' insulation components for sprinkler and fire extinguishing lines adapt exactly to the geometries of the most common pipe dimensions, see above Giele. "That is why we were able to cover the lines quickly, in a space-saving and economical manner."

The system used by him and his employees consists of several coordinated components. The “Conlit PS 150 Sprinkler Section” pipe shells are used to cover pipelines, while the “Conlit PS 150 Sprinkler Cap” is a molded part specially designed to cover pipe couplings. The "Conlit PS 150 sprinkler bend" is used as a molded part to strengthen pipe bends. The joints between the insulation on the pipelines and the molded parts on bends and couplings are glued with aluminum adhesive tape, the insulation joints with fire protection adhesive.

Fast construction progress

“The fire extinguishing lines and sprinkler lines in the new St. Joseph-Stift building are made of steel. We have insulated up to pipe dimensions of 114.3 mm with the pipe shell, Conlit PS 150 Sprinkler Section ’in a thickness of 60 mm. Larger dimensions were given to clothing made of, Conlit Steelprotect Section ’in 70 mm", explains Giele. What, from the point of view of the fire protection professional, was particularly beneficial for the rapid construction progress, is the installation of the “Conlit” pipe shells for the sprinkler cladding, which is very similar to the processing of the “Rockwool 800”. Like all pipe sections from the manufacturer, they are simply placed with the open side over the sprinkler line. The joints of the shell, previously provided with fire protection adhesive, are pressed together and thus reliably closed. All butt joints to the adjacent pipe sections are first glued and then fixed with binding wire or tensioning tape at a distance of a> 400 mm. Finally, the pipe sections are masked with adhesive tape. Additional gluing of the fire protection shells to the sprinkler line or the pipe suspension is not required. Pipe suspensions are clad with pipe sections following the profile and the brackets are then glued to the ceiling structure. Fire protection adhesive is then used.

The sprinkler insulation, slit open on one side, is placed over the sprinkler line with the open side. Then the joints of the shell, which were previously provided with fire protection adhesive, are pressed onto one another. Butt joints to adjacent pipe sections are first glued and sealed with adhesive tape. Finally, all elements are fixed with binding wire or tensioning tape. Image: Deutsche Rockwool GmbH & Co. KG

Molded parts for coupling elements and bends

The two-part “sprinkler cap” was used for the pipe coupling elements up to 114.3 mm. This is simply placed around the coupling and then glued to the pipe sections at the butt joints as usual. For larger pipe dimensions, the manufacturer recommends cladding with "Conlit Steelprotect Section". The pipe sections are brought close to the coupling element on both sides. “The element is covered by the pipe shells, the inside diameter of which must correspond to the outside diameter of the pipe cladding. The outer pipe shell must rest on both sides at least 150 mm on the lower pipe shell. The inner diameter of the pipe shells for covering the couplings can also be adapted to the coupling element, whereby it must be ensured that the thickness of the cladding is at least 20 mm at every point, ”explains Giele. His team was also quick and easy to insulate the pipe bends. Only minor cutting and adjustment work was necessary on the molded parts belonging to the “Conlit” system.