Penetration (firestop)

Penetration (firestop)

A penetration, in firestopping, is an "opening", such as one created by the use of a cast-in-place sleeve, in a wall or floor assembly required to have a fire-resistance rating, for the purpose of accommodating the passage of a mechanical, electrical or structural penetrant. The penetration may or may not contain a firestop system. A "penetration" is not a "penetrant". A penetration may or may not include a penetrant.

Old terminology

The nuclear industry in particular used to refer to firestops as "penetration seals" or "penseals". These terms are superseded by the term firestop. Whereas penetration seals or penseals only dealt with openings made to accommodate penetrants, firestops now also include Joint (building).

Why the term "Penetration (firestop)"?

It is useful to have clarity in construction communications, to differentiate between the "opening", whether sealed or not, and the penetrants, which are optional components of a penetration, as sometimes openings (penetrations of the fire barrier) are created for future use, especially in electrical service rooms. A firestop, after all, tends to be easier to remove than concrete, which requires coredrilling equipment, cooling water, etc. A firestopped penetration may also be referred to as a firestop, as a firestop, by definition, is a system. Therefore, the terms "firestop" and "penetration" can at times be deemed to be interchangeable.

ee also


* Sleeve (construction)
* Passive fire protection
* Annulus (firestop)
* Joint (building)
* Penetrant
* Mortar (firestop)
* Firestop pillow
* Fire test
* System

External links

* [http://www.warringtonfire.net/Default.asp?DepartmentID=1&SectionID=91&SubSectionID=77&TopicID=70 Penetration seals (firestops) treatise by Warrington labs]
* [http://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1552/ Penetration seals (firestops) treatise by] Nuclear Regulatory Commission
* [http://www.thomasnet.com/products/penetration-seals-73575003-1.html Penetration seal (firestop) vendor listings by Thomas Register]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Penetration — can refer to:* Sexual penetration * Market penetration, the degree to which a product or service is known and/or used * Penetration (telecommunications) * Penetration (firestop), an opening in a wall or floor assembly required to have a fire… …   Wikipedia

  • Firestop — A firestop is a passive fire protection system of various components used to seal openings and joints in fire resistance rated wall and/or floor assemblies, based on fire testing and certification listings. Unprotected openings in fire… …   Wikipedia

  • Firestop pillow — Firestop pillows are passive fire protection items, used for firestopping holes in wall or floor assemblies required to have a fire resistance rating. The products must be used in accordance with a valid certification listing, subject to listing… …   Wikipedia

  • Mortar (firestop) — Firestop mortars are mortars most typically used to firestop large openings in walls and floors required to have a fire resistance rating. They are passive fire protection items. Firestop mortars differ in formula and properties from most other… …   Wikipedia

  • Sleeve (construction) — In construction, a sleeve is used both by the electrical and mechanical trades to create a penetration.MaterialsSleeves can be made of: * sections of steel pipe * plastic * sheet metal * proprietary devices that are listed firestop… …   Wikipedia

  • Packing (firestopping) — Packing is the process and/or the materials used in filling both service penetrations and building joints with backer materials as approved components within a firestop.PurposePacking with inherently fire resistive materials, such as rockwool or… …   Wikipedia

  • Cable tray — A cable tray system, according to the US National Electrical Code, is a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways. Cable trays are used… …   Wikipedia

  • Joint (building) — A building joint is a junction where building elements meet without applying a static load from one element to another. When one or more of these vertical or horizontal elements that meet are required by the local building code to have a fire… …   Wikipedia

  • Bathtub — A bath (IPAEng|bɑ:θ), bathtub (AmE), or tub (s in. acrylic or fiberglass, but alternatives are available in enamel over steel or cast iron, and occasionally wood. A bathtub is usually placed in a bathroom either as a stand alone fixture or in… …   Wikipedia

  • Penetrant (mechanical, electrical, or structural) — Penetrants, or penetrating items, are the mechanical, electrical or structural items that pass through an opening in a wall or floor, such as pipes, electrical conduits, ducting, cables and cable trays, or structural steel beams and columns. When …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”