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{{Refimprove|date=January 2024}}
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[[Image:Sprinkler branch penetration.jpg|thumb|[[fire sprinkler system|Sprinkler]] branch [[pipe (material)|pipe]] through-penetration with [[plastic]] [[Sleeve (construction)|sleeve]] - missing [[firestop]] in [[concrete]] fire separation. The space between the sleeve and the pipe is the '''annulus''' or '''annular space''']]
{{Article for deletion/dated|page=Annulus (firestop)|timestamp=20211229151909|year=2021|month=December|day=29|substed=yes}}
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[[Image:Sprinkler branch penetration.jpg|thumb|[[fire sprinkler system|Sprinkler]] branch [[pipe (material)|pipe]] through-penetration with [[plastic]] [[Sleeve (construction)|sleeve]] - missing [[firestop]] in [[concrete]] fire separation. The branch pipe is a penetrant, as is the plastic sleeve, which is a code violation if left in place, unless allowed by the [[certification listing]] with a firestop that permits such sleeving to be left in place. The space between the sleeve and the pipe is the '''annulus''' or '''annular space''']]


The '''annulus''', or '''annular space''', is the space between a [[penetrant (mechanical, electrical, or structural)|penetrant]] and whatever surrounds it, such as the sides of an opening or a [[Sleeve (construction)|sleeve]], as the case may be.
The '''annulus''', or '''annular space''', is the space between a [[penetrant (mechanical, electrical, or structural)|penetrant]] and anything that surrounds it, such as the sides of an opening or a [[Sleeve (construction)|sleeve]], as the case may be.<ref>{{Cite web |title=Fire Stop Technologies |url=https://firestopstl.com/Definitions.html |access-date=2024-01-15 |website=firestopstl.com}}</ref> It is named after the corresponding [[Annulus (mathematics)|geometric concept]] due to its shape.


==References==
Sometimes an annulus can be ''"offset"'', meaning that the penetrant is not centred. If the firestop was [[fire test|tested]] only to a perfectly centred opening, an offset may disqualify it for use in the field.
{{Reflist}}

In practical terms, an offset penetrant or annulus may very well present an added degree of difficulty for passing the [[fire test]]. A [[metal]]lic sleeve as well as a metallic penetrant will conduct heat through the firestop. Insulation on the bottom of floor systems or in the middle of wall systems, as is the case with caulking or paint based (soft) systems, will encourage more [[heat]] to travel through the sleeve and the penetrant, which can put more stress on the seal on the unexposed side. In the case of a thin (below 4") [[Mortar (firestop)|firestop mortar]], there is also more potential hazard from tight annular spacing because metal expands during the fire, thus squeezing the firestop - only to rapidly shrink when hit with the hose-stream test, which can let water through, thus failing the H [[Fire-resistance rating|rating]] in Canada or the entire rating in the US, where hose-stream testing is mandatory. Such a failure may no longer be visible once the test assembly has reached ambient temperatures again.

For all these considerations, the annular space is a critical aspect of field approvals.


==External links==
==External links==
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* [http://www.freepatentsonline.com/6820382.html Annulus, a term used within a firestop patent]
* [http://www.freepatentsonline.com/6820382.html Annulus, a term used within a firestop patent]
* [https://web.archive.org/web/20080828112411/http://www.adfire.com/FS%20products/fs_systems/UL%20FS%20Systems/April%2012%202007%20systems/C-A-J-%2021%20systems/C-AJ-1557_021207.pdf Annulus, as used in UL System C-AJ-1557 Firestop System, Configuration A]
* [https://web.archive.org/web/20080828112411/http://www.adfire.com/FS%20products/fs_systems/UL%20FS%20Systems/April%2012%202007%20systems/C-A-J-%2021%20systems/C-AJ-1557_021207.pdf Annulus, as used in UL System C-AJ-1557 Firestop System, Configuration A]

{{Fire protection|state=collapsed}}


[[Category:Passive fire protection]]
[[Category:Passive fire protection]]

Latest revision as of 10:41, 20 January 2024

Sprinkler branch pipe through-penetration with plastic sleeve - missing firestop in concrete fire separation. The space between the sleeve and the pipe is the annulus or annular space

The annulus, or annular space, is the space between a penetrant and anything that surrounds it, such as the sides of an opening or a sleeve, as the case may be.[1] It is named after the corresponding geometric concept due to its shape.

References

[edit]
  1. ^ "Fire Stop Technologies". firestopstl.com. Retrieved 2024-01-15.
[edit]

External examples of the use of the term.

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