UL 1709-2011 pdf download
UL 1709-2011 pdf download.Rapid Rise Fire Tests of Protection Materials for Structural Steel.
4.12 Average furnace temperature is to be determined by averaging the temperatures recOrded by the eight thermocouples placed 4 in (102 mm) from the column, The average shall be 2000 ±200F (1093 ±111CC) and individual temperatures are to be 2000 ±400aF (1093 ±219CC) 5 mm after the start of the test and until the end of the test.
4.13 The average furnace temperature curve shall be reproduced to maintain the furnace control described in Furnace Control, Section 3.
4.14 A record of the temperatures measured near the face of the column and the oxygen content are to be retained on file for a period of 10 years.
5 Test Sample
5.1 The size of the steel column used in the test sample shall be representative of the design. materials, and workmanship for which Classification is desired, The protection material shall be applied to the steel column in accordance with acceptable tieki practice. The length o the protected steel column shall be at least 8 ft (2.44 m). The sleel column is to be supported vertically during application of protection material and during lire exposure.
5.2 The temperature of the steel column is to be measured by no fewer than three thermocouples located at each 01 four levels (minimum of 12 thermocouples). The upper and lower levels are to be 2 ft (610 mm) from the ends of the steel column, and the other Iwo intermediate levels are to be equally spaced between the upper and lower levels. The thermocouples at each level are to be placed to measure significant temperatures of the component elements of the steel column. Figure 5.1 shows typical locations of thermocouples on wide flange and tubular steel columns. The thermocouples are to be fabricated tram minimum 0.032-in (0.8-mm) diameter (No. 20 B & S gauge) chromel•alumel wires or equivalent having a time constant ol 2 S or less.
5.3 The applied protection material is to be restrained against longitudinal thermal expansion greater than that of the steel column by atlaching rigid steel plates or reinforced concrete to Ihe ends of the steel column prior to application of the protection material. The plates or concrete are to be sized to provide direct bearing over the entire transverse area of the protection material.
5,4 The ends of the test sample. including the means for restraint, are to have sufficient thermal insulation to prevent significant direct heat transfer through to the ends of the steel column from the furnace
5.5 Prior to test, the test sample is to be conditioned such that the dampest portion of the test sample has achieved a moisture content corresponding to drying to equilibrium with air in the range of 50 to 75% reLative humidity at 73 ±5°F (22.8 ±2.8CC).
6 Performance Criteria
6.1 The transmission of heat through the protection material during the period of fire exposure for which
Classification is desired shall not raise the average temperature at any of the four levels of the steel
column above 1000°F (538°C) and no thermocouple shall indicate a temperature greater than 1200°F
(649°C).
SMALL-SCALE TEST METHOD
7 Furnace Control During Fire Test
7.1 The average furnace temperature curve shall be reproduced to maintain the furnace control described in Furnace Control, Section 3.
7,2 The temperature near all parts of the assembly, as obtained from the average of the readings of four thermocouples symmetrically disposed within the test furnace is to comply with the time-temperature curve of Fgure 3.1.
7.3 The thermocouples are to be constructed as specified in 3.5.
8 Test Sample
8.1 The test sample is to be a 2 ft by 6 by 6 in (610 by 152 by 152 mm) structural steel tube with a 3/16-In (4.8mm) wall thickness, The steel tube is to be provided with steel caps and covered with the protective material being investigated. Figure 8.1 shows the details of a test sample prior to application of the protective material.
