WEBVTT

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When considering fire suppression,

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we are thinking about if a fire does get started,

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what are the three things that it needs to survive?

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The first thing is oxygen, fuel, and then heat,

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which is a bit ironic sounding, sort of like we need life to have life,

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but yes, a fire needs heat.

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And if, in fact, you can go after that element of survival,

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you can actually suppress or stop a fire.

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On the other side is what can be used for detection.

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Seeing the fire would be using flame detection.

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Here,

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it is a photoelectric eye that is sensing the infrared heat from

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that fire or visible and ultraviolet light that may come from the

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fire that changes the dynamics of the room.

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Smoke detection uses ionization and photoelectric capabilities.

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In other words, it's the particles that come from the burn off.

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And then heat detection is all about the rate of rise of temperature.

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This is the original way of being able to detect a fire.

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For putting fires out, there are a number of different agents that could be used.

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Gaseous agents is an example, like FM‑200,

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which is a colorless, liquefied, compressed gas.

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It's stored as a liquid and dispensed into the hazard as a colorless,

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electrically non‑conductive vapor that is clear and does not obscure vision.

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Argonite is another example of an agent that could be used in order to put a

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fire out and possibly suppress it from being able to start,

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along with Aero‑K, foam, and yes,

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we still have water as a means of being able to put fires out.

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If you are in a municipality that mandates the use of water for putting

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the fire out as a primary agent within a building,

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then there is some need to do some remediation.

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One of the remediation steps is to use what is called dry‑pipe.

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Here, as pictured, the water is not filling up the whole pipe.

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There is something that prevents the water from going all the way

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out to the end of its expression capability,

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and that may be the part that's actually hanging over the

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sensitive equipment inside the data center.

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Along with this, you would possibly also have some kind of pre‑action.

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One of the elements of pre‑action is a timer. That way, the human

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could actually get involved and say you know what,

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that's not a fire, and even though the warning is telling us that it's a fire,

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there may be a delay before the water is actually expressed.

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Once the fire is actually allowed to be detected and those who have

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manual override are wanting to escape from that fire,

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the pre‑action time will expire and then the dry pipe will release the water.

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On the way out of the facility,

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those who are escaping may have a button that they need to

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push called an Emergency Power Off button.

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This does an ungraceful disconnection of the power serving into the server room.

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Think of it not only as a way of stopping the power going to the UPS system,

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but also stopping the power coming from the UPS

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systems into the data center equipment, therefore,

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making it less likely that those having to escape a fire don't

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have a worse day in getting electrocuted.

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Next, we're going to take a look at the heating,

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ventilation, and air conditioning under design resilience.