ML20076K726

Firecode CT Gypsum Thermafiber Access Firestopping for Walls

ML20076K726
Person / Time
Site:	LaSalle
Issue date:	07/24/1978
From:	Orals D, Quigg P UNITED STATES GYPSUM CO.
To:
Shared Package
ML20076K714	List: ML20076K715 ML20076K718 ML20076K722 ML20076K726 ML20076K730
References
NUDOCS 8307180066
Download: ML20076K726 (17)

Text

-

y UNITED STATES GYPSUM COMPANY /

1000 East Northwest Highway / Des Plaines. Illinois 60016 8 RESEARCH CENTER AREA CODE 212 CYPRESS 63301 DIRECODE CT GYPSUM THERMAFIBER NCCESS FIRESTOPPING FOR WALLS a

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D.

L. Orals, PE P.

S. Quica, PE Research ALJociato Manager, Structural &

Fire Testing B307180066 030711 PDR ADOCK 05000373 0

PDR

- i INTRODUCTI'ON l

i One of the more elementary devices to effect fire protection is contain-

~

ment.

That is, the construction of a fire-resistant barrier designed to l

confine a fire to the area of origin.

These barriers may be breached in order to provide access of personnel or services from one area to another.

~

j i

Electrical power generating stations are fitted with appropriate fire j

barriers to provide containment.

However, it is often necessary to j

penetrate these barriers in order for the plants to perform their function.

1 For example, communication and power transmission cables extend through-i out the plant, passing thr,gugh fire-rated walls and floors.

If these points of penetration are not properly treated, the fire barriers may be i

seriously compromised.

This report covers a means whereby a fire-rated wall breached to permit the passage of cables can be fitted to fulfill its function as a fire barrier.

Specifically, this report covers a 3-hr fire test under ASTM l

E119 fire exposure of a concrete masonry wall which passes power trans-mission cables contained within two cable trays and three groups of

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communication cables through openings in the wall.

j CONSTRUCTION AND MATERIALS

]

A wall of 8-in. thick, hollow core, concrete block was constructed as shown in Fig. 1.

A rectangular opening, 32-in, wide by 18-in. high, 4

was provided near the top of the wall to permit the passage of two 4

cable trays containing cable.

Three, 6-in. diameter holes, were 9

located near the bottom of the wall, each of which contained cables 1

which also passed through the wall.

l Two, 16 ga cable trays, 18-in. wide by 4-in. high by 5-ft long, were i

placed in the rectangular opening and fastened in-place to GLOBE channel

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The trays extended 1 ft beyond the exposed face, leaving 3 ft 4 in. of projection beyond the unexposed face.

The heights of the cable' tray sides were increased by adding "U" shaped channels, 1-in. high and 12-in. long above the sides, centered in the opening.

The added height was needed to ensure that FIRECODE CT Gypsum would cover the cables which almost completely filled the. trays.

Thirty 5-ft long by 1-1/4-in.' in diameter, with sections of KERITE power cable, 37 No. 12 ga copper conductors, were placed in the upper cable tray.

Thirty-eight sections of COLLYER control cable (Spec. EM 29115, nine tv

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conductor), 5-ft long by 1-in. diameter, with butyl rubber insulation and a PVC jacket were placed in the lower cable tray. The three cir-cular openings were each penetrated with three 5-ft long sections of the COLLYER cable.

Fifteen pounds of FIRECODE CT Gypsum was mixed with 21 pounds of water and placed in each tray over the cables.

Tapping the tray with a rub-ber mallet during placement assured that the gypsum would flow around the cables in the tray and fill all interstices.

The " fire-stop" was full width o'f the cable tray, approximately 16 in, long at the bottom cnd 12 in. long at the top of the channels placed on the tray flanges.

The FIRECODE CT Gypsum was force air dried at room conditions for eight days before test.

The rectangular opening was closed using j

THERMAFIBER mineral fiber insulation (4 pcf density) compressed slightly end placed between the trays and between the trays and the opening.

(See Photo No. 1).

The three holes in the bottom portion of the wall were protected as follows:

The first hole was fitted with 4 in. of T!!EFMAFIDER contered in the opening and then covered with 2 in. of FIRECODE CT Gypsum on

. cach face.

The second hole was fitted with 6 in. of THERMAFIBER and covered with 2 in of FIRECODE CT Gypsum on the unexposed face.

The third hole was fitted with 6 in. of THERMAFIBER and covered with 2 in.

of FIRECODE CT Gypsum on the exposed face.

(See Photo No. 2).

INSTRUMENTATION Locations of the thermocouples on the test sample are shown on sketches 1 and 2.

Temperatures were recorded on the unexposed surface of the concrete block wall and THERMAFIBER, and on the conductor and jacket of the cable in a plane evf5 with the unexposed face of the wall.

Two thermocouples were placed on the jacket of the cable at the end I

of the cable tray as shown'in Fig.

2.

TEST PROCEDURE The specimen was subjected to a fire programmed in accordance with the ASTM E119 time-temperature curve.

Furnace temperatures were monitored by eight thermocouples distributed throughout the furnace, located 6 in.

from the wall.

TEST RESULTS The fire endurance test was conducted on May 24, 1978, at the United States Gypsum Company Research Center.

Following is a record of obser-ved events as they occurred:

Time Min.

Observations Bottom cables in circular holes burning.

1 Cables in bottom tray smoking.

4 Cables in bottom tray on exposed side began to burn.

7 Cable in top tray on exposed side began to burn.

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r

I Time Min.

Observations 1

11 Bottom cable tray distorting on exposed side - center pan bowed up.

26 All cables on exposed side burning.

63 Several hairline cracks were noted in FIRECODE CT Gypsum in tray on unexposed surface.

Cable in lower holes developing blisters on unexposed surface.

77 All cables on exposed surface still burning.

95 FIRECODE CT Gypsum in trays stcaming - earlier hairline tv cracks have enlarged to 1/16 in. in width - one crack open 1/8 in. in width.

'(See photo No. 3).

135 Blisters in cable popping.

143 Greenish-black liquid dripping from end of cable in top tray on unexposed surface.

150 No change - slight opening between THERMAFIBER and cable tray bottom tray right side.

185 Test terminated - cable in tray still burning inside the furnace.

(See Photo No. 4).

Immediately after the fire endurance test, the assembly was removed from

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the furnace and subjected to a 30 psi hose stream test as shown in Photo No.

6.

After approximately 10 sec of hose application, on the second pass of the hose stream, the THERMAFIBER around the cable tray was forced out of the opening.

The smaller circular penetrations near the bottom of the wall resisted three passes of the hose stream without failure.

Photos No. 5 and No. 7 show the assembly before and after the hose stream test.

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Graph 1 shows temperatures recorded on the unexposed surface. over the THERMAFIBER and concrete block.

Graph 2 illustrates the average and maximum temperatures recorded on the power cable jacket and conductors in the top tray.

Graph 3 illustrates the average and maximum temperatures recorded on the control cable jacket and conductors in the bottom tray.

Graph 4 illustrates the temperatures developed during test on the con-trol cable jacket and condoetors in the three smaller circular pene-trations.

CONCLUSIONS The larger conductors in the power cable transferred more heat tc unexposed surface than the control cables with smaller conductors as shown in Graphs 2 and 3.

The control cables penetrating the wall through the 6-in. diameter holes exhibited lower temperatures on both the jacket and the copper as a function of the quantity of FIRECODE CT Gypsum used.

FIRECODE CT Gypsum on both faces of the penetration allowed 596 F temperature rise on cable conductors whereas FIRECODE CT Gypsum on only one face allowed tempera--

ture rises of 652 F and 738 F at 3 hrs.

The higher temperature occurred on the penetration detail with FIRECODE CT Gypsum exposed to the fire.

No passage of hot gases or flame occurred during the three hours of fire exposure through the FIRECODE CT Gypsum or THERMAFIBER details placed in the opening as' described in this report.

~

The hose stream dislodged the.THERI1AFIBER installed around the cable i

trays but did not loosen or penetrate the FIRECODE CT Gypsum instal-lation placed within the tray.

The hose stream did not dislodge the fire-stops placed in the three G-in. diancter penetrations.

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Photo No. 3 Steam rising from FIRECODE CT Gypsum in top. tray after 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 35 minutes of exposure

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Photo No. 4 After 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and 5 minutes of E319 fire e>:posure (furnace flames e:<tinguished) cable on exposed f ace still burning and glowing.

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1 Photo No. 5 Exposed surface before hose strean test showing un-breached wall.

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!!oce stream applied to exposed surf ace after fire endurance testing.

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,_ _ J Photo 1:o. 7 Exposed surface afte'r hose stroan test showing wool dislodged around cable tray and circular penetrations unbreached.

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