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MCT - Multi Cable Transit  Round Version of MCT - 'Multiplug'  Plastic Pipe Firestop Device

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Main Site

Firestop Site

Code Evaluations AVAILABLE!

Glossary of Fire Protection Terms

3M Fire Barriers

Vectorising Drawings and Maps; Paper to CAD

Circuit Integrity Fireproofing

Bounding

Code Req's for Firestops

Essay on Performance Based Codes

Master Spec. Section 07840 Firestopping

Related Sections to 07840

Penetration Seal Drawings

Building Joint Drawings 1

Building Joint Drawings 2

Building Joint Drawings 3

History of Firestops in North America

Warnock Hersey Experience

Firestop Trade Jurisdiction

Achim Hering Bio

Man Made Mineral Fibres

Fire Protection Industry Links

Firestop Products and Equipment

Firestop Mortar

Firestop Silicone Foam

Intumescent Products

Endothermic Products

Insulation Products

Caulking & Paint Firestops

Firestop Pillows

Firestop Devices

Firestop Slide Show 1 of 10 Basics

Firestop Slide Show 2 of 10 Code

Firestop Slide Show 3 of 10 No Seal

Firestop Slide Show 4 of 10 Deemed-to-comply

Firestop Slide Show 5 of 10 Misinstalled

Firestop Slide Show 6 of 10 Re-entered

Firestop Slide Show 7 of 10 Faulty Spec.

Firestop Slide Show 8 of 10 Proper Firestops

Firestop Slide Show 9 of 10 Test

Firestop Slide Show 10 of 10 Smoke and Trays

Sample Firestop Listing

Kitchen Exhaust Cleaning; Boiling-Hot Pressure Washing

ULC           UL

T O S

(Theory of Survival)

DIBt

TU Braunschweig iBMB

CONTACT

Firestop devices are mechanical widgets, usually involving steel shells and fasteners. This is what differentiates them from "Fill Void or Cavity Materials", to quote ULI's euphemism for materials that are stuffed, pumped, packed or sprayed into holes and joints. The first devices ever, were also the first real firestops: MCTs or Multi Cable Transits. You can read about them on the firestop history page. And essentially, it all went downhill from there. MCTs are the mother of all firestops. Nothing else is as organised, as 'everythingproof' and as inspectable. The overwhelming majority of firestops in North America are misinstalled.  And to know whether or not a firestop is truly misinstalled, such as too thin, nothing between the cables etc. you have to do a lot of work to find out for sure, such as crawl into the dirty, grungy little places, where all the holes are, compare listings against installed thicknesses and other relevant tolerances etc.  No one wants to do that, or, more importantly, PAY to do that. And beyond that, people really would not want to find out just how bad their installations really are because then the real fight starts.  With MCT's, on the other hand, anyone at all can quickly see whether the installation is correct or not. If you can pull on a cable and wind up pulling it through the seal, you obviously haven't compressed it enough. If you can see through somewhere, there is also an obvious problem, which can be corrected without destruction. You can even ground all conductors through the seal and thus combat EMI and EMP events, which are of concern aboard naval vessels. You can also get an extreme pressure resisting version, which can be used aboard submarines. Changes to MCTs are simple mechanical work. Drawbacks for MCTs are the high initial cost as well as their inability to achieve T ratings on large power cables. Each rubber module is only 60mm deep. Despite the high density of the rubber modules, 60mm is just not enough to absorb a lot of energy away from the penetrating cables. In order to fight heat penetration, MCTs are thus at times insulated with MMMF. Now we're back to stuffing and prodding and shoving wool over and into holes again. This can then also have an effect on ampacity derating, although the MCT by itself has a positive effect. Bounding is also affected by the addition of materials to a system. T ratings are mandatory in Canada for all penetrations and joints in fire walls and occupancy separations.  If you can afford to place MCTs back to back, in one hole in a fire separation, you can fetch up to 6 hours of FH rating. If you are researching AIDS cultures one one side of the fire separation and doing anything else on the other, I would definitely recommend the used of MCTs in between - T rated or not. The United States Navy is a cost conscious and technically astute organisation. There are very good reasons for using this superb method of firestopping. And there are ways to overcome its shortcomings (low T-ratings). The original MCT can be purchased from Lycab as well as Nelson. Everything else is but a copy, though some have some interesting variations.

As a species, we all like to categorise and pigeonhole and seek patterns. Thus plastic pipe firestop devices also fall into the DEVICES category. For plastic pipe firestop devices, metallic frames are fastened around the penetrant. The interior is lined with a high strength intumescent, such as Palusol, graphite or other sodium silicates (3M is the only provider of sodium silicates, which do not require extensive protection from moisture in order to stand the test of time and humidity. They are DIBt approved.). There are also newer methods, where the intumescent is inserted into the openings in strap form, without the need for an external metal collar. In North America, there has been one product recall of such collared devices, based on common sodium silicate (not DIBt approved, and thus susceptible to erratic function due to common environmental influences). There has also been one firm, which went out of business, who produced what they referred to as "donuts". At first, the company used DIBt approved 3M intumescents. Then, they switched to a cheaper domestic brand, which was proven to be inoperable in many cases by a study from the University of Calgary, Professor Toluffson, sponsored by the Soil Pipe Manufacturers Association. The intumescent was cheaper than what the vendor used before, but it did not work very long. This now means that what we have is a great many buildings, across this country, which have this product installed (the firm claimed sales of approximately $40,000.00 per year) - and it does not work. Thus, there are many fire separations, which people paid to firestop, which are actually ZERO rated as a result of this vendor's actions. The product has been off the market for some time now.  Unlike MCTs, these devices are often misinstalled. Apart from standard intumescent issues (all solved by demanding current DIBt approvals) popular installation errors include the use of lead or even plastic anchors. Other listing tolerances are popularly disregarded too. It comes comes back to BOUNDING, as it usually does. Light carbon foam producing intumescents are not suitable for use in plastic pipe firestopping. When exposed to sufficient heat, the pipe melts and burns and the intumescent expands to close the hole.

BACK to Products

Firestop Page

Main Page

Contact

Main Site

Firestop Site

Code Evaluations AVAILABLE!

Glossary of Fire Protection Terms

3M Fire Barriers

Vectorising Drawings and Maps; Paper to CAD

Circuit Integrity Fireproofing

Bounding

Code Req's for Firestops

Essay on Performance Based Codes

Master Spec. Section 07840 Firestopping

Related Sections to 07840

Penetration Seal Drawings

Building Joint Drawings 1

Building Joint Drawings 2

Building Joint Drawings 3

History of Firestops in North America

Warnock Hersey Experience

Firestop Trade Jurisdiction

Achim Hering Bio

Man Made Mineral Fibres

Fire Protection Industry Links

Firestop Products and Equipment

Firestop Mortar

Firestop Silicone Foam

Intumescent Products

Endothermic Products

Insulation Products

Caulking & Paint Firestops

Firestop Pillows

Firestop Devices

Firestop Slide Show 1 of 10 Basics

Firestop Slide Show 2 of 10 Code

Firestop Slide Show 3 of 10 No Seal

Firestop Slide Show 4 of 10 Deemed-to-comply

Firestop Slide Show 5 of 10 Misinstalled

Firestop Slide Show 6 of 10 Re-entered

Firestop Slide Show 7 of 10 Faulty Spec.

Firestop Slide Show 8 of 10 Proper Firestops

Firestop Slide Show 9 of 10 Test

Firestop Slide Show 10 of 10 Smoke and Trays

Sample Firestop Listing

Kitchen Exhaust Cleaning; Boiling-Hot Pressure Washing

ULC           UL

T O S

(Theory of Survival)

DIBt

TU Braunschweig iBMB

CONTACT

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