Galvanized and carbon steel pipes are permitted on which part of a foam system?

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Multiple Choice

Galvanized and carbon steel pipes are permitted on which part of a foam system?

Material compatibility is the key idea. In foam fire suppression systems, there are two streams to consider: the concentrated foam concentrate and the diluted foam solution. Foam concentrate can be highly caustic or reactive with certain metals, especially zinc coatings and bare steel, so piping that carries the concentrate is typically made from materials resistant to those chemicals (often stainless steel or specially coated/lined options). The foam solution, however, is the diluted mix that results from combining the concentrate with water and is much less aggressive toward common pipe metals. For this reason, galvanized and carbon steel pipes are typically permitted for the foam solution portion of the system, where the diluted solution flows to discharge devices.

Material compatibility is the key idea. In foam fire suppression systems, there are two streams to consider: the concentrated foam concentrate and the diluted foam solution. Foam concentrate can be highly caustic or reactive with certain metals, especially zinc coatings and bare steel, so piping that carries the concentrate is typically made from materials resistant to those chemicals (often stainless steel or specially coated/lined options). The foam solution, however, is the diluted mix that results from combining the concentrate with water and is much less aggressive toward common pipe metals. For this reason, galvanized and carbon steel pipes are typically permitted for the foam solution portion of the system, where the diluted solution flows to discharge devices.

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