ML20195F230

Fire Test of 3 H Curtain Type Fire Damper Utilizing Alternate Methods of Installation

ML20195F230
Person / Time
Site:	Vogtle
Issue date:	04/14/1986
From:	UNDERWRITERS LABORATORY, INC.
To:
Shared Package
ML20195F221	List: ML20195F216 ML20195F223 ML20195F230
References
NUDOCS 8606110201
Download: ML20195F230 (32)

Text

Attachment 3 y

UNDERWRITERS LABORATORIES INC.

m rmcsm mao erruanoom.iwas soo.:

o an independent, not-for-profit organization testingfor public safety File NC976 Project 85NK31189 April 14, 1986 REPORT on FIRE TEST OF 3 H CURTAIN TYPE FIRE DAMPER UTILIZING ALTERNATE METHODS OF INSTALLATION Georgia Power Co.

Waynesboro, GA Copyright C

1986 Underwriters Laboratorien Inc.

Underwriters Laboratories Inc. authorizes the above company to reproduce this Report provided it is reproduced in its entirety.

In no event shall UL be responsible to anyone for vhatever use or nonuse is made of the information cuntained in this report and in no event shall UL, the employees, or its agents incur any obligations or liability for damage, including, but not limited to, consequential damages arising out of or in connection with the use, or inability to use, the information contained in this report.

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File NC976 Page G1 Issued: 4-14-86 EEEEEEh The subject of this Report is the fire test investigation of horizontal mount fire damper assemblies with alternate methods of installation used in air conditioning and ventilating ducts and intended to protect openings in fire resistive floors.

The sole purpose of this investigation was to provide exploratory test data, without conclusions, to Georgia Power Company for in-house design considerations.

The test program consisted of constructing two fire damper assemblies and one reinforced concrete floor into which the dampers were installed.

The floor test assembly was subjected to a fire exposure with the furnace temperatures controlled in accordance with the standard time-temperature curve outlined in the Standard, Fire Dampers and Ceilir.'1 Dampers, UL 555.

Following the fire exposure, the assembly was subjected to the impact, erosion, and cooling effect of a water hose stream test.

MRF/JSP:mjw lbry

File NC976 Page 1 Issued: 4-14-86 R{ggglPIlgE FIRE DAMPER TEST SAMPLES:

The fire dampers tested under this investigation were

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supplied by Air Balance Inc. and bore the UL Classification Mark for 3 h rated fire dampers.

The construction details of the dampers were of a proprietary nature and are on file at the Laboratories.

The sizes of dampers tested in the floor were a 44 in, wide by 48 in. long single section and a 35 in. by 35 in.

single section.

The dampers were installed in sleeves by employees of the Zack Company, a contractor employed by Georgia Power Company.

The sleeves were 24 in. deep, fabricated of 0.075 in. thick steel.

Each sleeve was two L-shaped pieces, continuously welded at the opposite corners.

The frames of the dampers were welded to the sleeves with 1 in. long welds spaced 7 to 7-1/2 in en center around the perimeter of each damper frame, on each side.

1 MRF/JSP:miw lbry

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File NC976 Page 2 Issued:

4-14-86 IEEI EEEEEE E R-1 FIRE ENDURANCE AND HOSE STREAM TEST:

SAMPLES The two samples of fire damper submitted for testing in the floor were as indicated above under " Fire Damper Test Samples".

At the submittor's request, all of the dampers were in the closed position for the start of the test.

TEST FLOOR A 12 in. thick reinforced concrete floor was prepared for the test.

Four openings (Nos.

7, 8,

9 and 10) were located in the floor as specified by the submittor and as shown on ILL.

1.

Openings Nos. 9 and 10 were located in the floor at the submittor's request, for future use; they were filled in with vermiculite filler slabs for the purposes of the test covered by this Report.

The sizes of openings provided for the dampers are shown below.

Construction of the test floor was witnessed by members of the technical and engineering staff of Underwriters Laboratories Inc. and the Zack Co.

Overall Damper Damper Size Floor Opening Size Opening No.

Tag No.

WxH, in.

WxH, in.

7 A-1500-57-003 44 by 48 48 by 52 8

A-1500-57-006 35 by 35 39 by 39 9

Not Applicable Not Applicable 48 by 52 10 Not Applicable Not Applicable 76 by 40 The overall dimensions of the concrete floor were 210 in.

wide by 112 in. long.

The floor was cast on the floor of the construction area using wooden forms.

Opening No. 8 was framed with 4 by 3 by 3/8 in, thick steel angles embedded into the floor on the fire side only as shown on ILLS. 1 and 2.

Steel rods were placed on chairs to provide the required reinforcement as shown on ILL. 3.

MRF/JSP:miw lbry

File NC976 Page 3 Issued:

4-14-86 The ready-mixed concrete obtained from a local source consisted of one part Portland Cement, 2.15 part sand, and 3.2 parts gravel, by bulk volume, mixed with approximately 6 gal of water per bag of cement.

The comprehensive strength and density of the concrete at 28 days, as determined from standard 6 in. diameter by 12 in, cylinders, averaged 4096 psi and 143 pcf, respectively.

The average slump during placement was 5 in.

After curing at ambient conditions for approximately 24 days, the concrete floor was placed into the steel test frame and force cured to obtain an acceptable moisture content (i.e, 75 percent maximum) for fire exposure.

When the curing was completed, a cementitious mixture was applied to the fire side of the floor along the sides to protect the structural steel angles and steel test frame.

SAMPLE INSTALLATION The samples of sleeved fire dampers were installed in the floor openings by employees of the Zack Co.

The installation was witnessed by the technical and engineering staff of Underwriters Laboratories Inc.

The two dampers were shimmed into the openings using 3 in.

deep by 1/4 in. thick steel plates.

The width of the plates was cut to fit the opening.

The plates were welded to the damper sleeves with a 1-1/4 to 1-1/2 in. long weld on each side.

The dampers were slid into the floor openings after attaching the shim plates.

Clearances of 1/8 to 1/4 in. existed between the shim plates and the floor opening in some places.

The shims were located on the upstream and downstream faces of each damper, on each of its four sides, approximately 1/4 in. in from the face of the floor on both sides.

The damper in opening No. 7 was retained in position using No. 10 gauge steel cover plates welded to the damper sleeve only on both faces of the opening, as shown on ILLS. 4 and on the horizontal support plan on the nonfire (top) side of the opening as shown on ILLS. 4 and 5.

Each cover plate was formed from four pieces of 3-1/2 in, wide steel plates which were continuously welded to each other at the four corners.

The cover plates were welded to the damper sleeves with 2 in. long welds spaced 5 in.

on center, with one weld at each corner.

The damper in opening No. 8 was retained in position using a No. 10 gauge steel cover plate on the nonfire side and a Type 84 support on the fire side.

The cover plate was same as desqribed above.

The Type 84 suppcrt consisted of structural steel angles, 3/8 in. thick, welded to the damper sleeve and embedded angles along four sides and to 1 in. long welds spaced 5 in. OC, with one weld at each corner as shown on ILL.

6.

MRF/JSP:mjw lory

File NC976 Page 4 Issued:

4-14-86 METHOD The fire endurance and hose stream test was conducted in accordance with the Standard of Underwriters Laboratories Inc.

for Fire Dampers and Ceiling Dampers, UL 555.

Prior to the test, each damper section was cycled at least three times by the submittor to verify proper operation of the dampers.

The fire damper assemblies previously described were subjected to the test with all dampers in the closed position at the start of the test as requested by the submittor and indicated previously in this Report.

The appearance of the unexposed and exposed faces of the test assembly prior to the test are shown on ILLS.

7, 8 and 9, respectively.

The appearance of the unexposed and exposed faces of the test assembly after the test are shown on ILLS. 11 through 15, and 16 through 20 respectively.

The furnace temperatures were measured with twelve thermoccuples symmetrically located in the furnace with the junction of the thermocouple located 12 in. from the exposed face of the test assembly.

Throughout the fire test, observations were made of the character of the fire and its control, the conditions of the exposed and unexposed faces, and all developments pertaining to the performance of the damper as a fire barrier.

Immediately following the fire exposure, the test assembly was withdrawn from the furnace and subjected to the impact, erosion and cooling effects of a 45 psi hose stream for 4 min, 22 s, as specified in the Standard for a 3 h rating.

RESULTS Observations During Fire Test - The fire was luminous and well-distributed during the fire test.

The temperatures recorded within the furnace chamber with respect to the Standard Time-Temperature Curve are shown on ILL. 10.

MRF/JSP:miw lbry

File NC976 Page 5 Issued:

4-14-86 The observations on the unexposed side (unless noted otherwise) were as follows:

Fire Exposure Time, h-min Observations 0-2 The galvanized coating on the b:.ades had melted and they were white in color.

There were no other changes noted.

0-5 Edges of sleeves were warping cn fire side.

0-35 The corners of the cover plates were warping up from the floor by 1/4 in. maximum.

Both dampers were tightly closed and the blades locked in position.

The blades in the south damper were beginning to turn red.

0-55 A couple of cracks were evident in the. concrete and moisture was being emitted.

The blades in the 44 by 48 in, damper had sagged down toward the fire by approximately 1 in.

1-10 The concrete floor was bowed down at its center by approximately 1/4 in.

Both dampers were tightly closed.

1-30 Both dampers were red hot.

2-0 No changes were observed.

Both dampers were closed tightly and the bottom blades were locked into position.

2-30 There were no changes observed.

2-45 No changes were noted in the' dampers.

They were both tightly closed.

l 3-0 Furnace fire was extinguished.

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1

File NC976 Page 6 Issued:

4-14-86 HOSE STREAM TEST:

METHOD Immediately after the 180 min fire exposure, the test

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assembly was withdrawn from the furnace and subjected to the impact, erosion and cooling effects of the 45 psi hose stream for 4 min, 22 s as specified in the test standard for a 3 h fire exposure.

At approximately 2 min into the hose stream test, it was observed that a momentary pressure surge caused the pressure at the base of the nozzle to increase above the 45 psi required.

While immediately attempting to adjust the pressure down, the hose stream was inadvertently stopped.

The pressure was readjusted to 45 psi at the base of the nozzle and the hose stream was continued to complete the remaining 2 min, 22 s.

RESULTS During application of the hose stream, the bottom blades in both dampers became unlatched and the blade packages opened up to result in visible through opening between the feeding edge of the bottom blades and the top edge of the frame guide channel.

The damper frames had buckled to result in clearances of approximately 1/8 in. maximum between the frames and sleeves although no visible through openings were apparent.

The blades in the 35 by 35 in damper had opened to leave a visible through opening along the entire blade length between the bottom blade and frame guide flange of 1-1/8 in. at one end to 1 in. at the other end.

Similarly, in the 44 by 48 in. damper, the blades had opened to leave visible through openings of 1-1/2 to 1-3/4 in. at one end to 3/4 in, at the other end.

The spring ramp in the north bottom corner of the 44 by 48 in, damper was twisted out toward the center of the damper by approximately 1/4 in, maximum.

The negator spring had partially slipped off of the arbor post due to the twisting.

Warping of the cover plates on the nonfire side of the floor assembly was minimal.

On the fire side, some of the concrete around opening No. 7 for the 44 by 48 in. damper had chipped away and the cover plate had buckled to result in clearances between the cover plate and floor of approximately 3-1/2 in. maximum.

The welds on the Type 84 support for the 35 by 35 in. damper were all intact and warping of the embedded angles was minimal.

MRF/JSP:mjv lbry

2 t

File NC976 Page 7 Issued:

4-14-86 EUMMA31 The following summary is based upon the results of the examination of the tests presented in this Report as they relate to established principles and previously recorded data.

FIRE RETARDANT PROPERTIES:

The dampers remained closed and latched for the entire fire exposure period.

The dampers and their installations remained securely positioned in the floor openings during the fire endurance test.

There were no visible through openings observed in any of the damper installations during the fire endurance test.

The clearances developed between parts on the.nonfire side of the test assemblics did not exceed 1/8 in. during the fire exposure.

HOSE STREAM RESISTANCE:

Both damper installations remained positioned in the floor during the hose stream test.

The blade packages in both dampers opened up due to the bottom blades becoming unlatched, to result in visible through openings of the magnitude specified in the Test Record.

In both installations, warping of the cover plates and the Type 84 support was minimal.

The installations and fasteners remained intact.

In no event shall UL be responsible to anyone for whatever use or nonuse is made of the information contained in this Report and in no event shall UL, the employees, or its agents incur any obligations or liability for damage, including, but not limited to, consequential damages, arising out of or in connection with the use or inability to use, the information contained in this Report.

i MRF/JSP:miw lbry

File NC976 Page 8 Issued:

4-14-86 The issuance of this Report in no way implies Classification or other Recognition of the installation system by UL and does not cuthorize the use of UL Classification Marks or any other reference to ULI in connection with the system.

Report by:

Reviewed by:

n MARGARET FIGUEROA J.

S. PARIKH Senior Project Engineer Senior Project Engineer Fire Protection Department Fire Protection Department MRF/JSP:m"w lbry

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