UL 1709-2017 pdf free download

UL 1709-2017 pdf free download.Rapid Rise Fire Tests of Protection Materials for Structural Steel.
5.3 The temperature of the open section is to be measured by no fewer than five thermocouples located at each of four levels (minimum of 20 thermocouples). The upper and lower levels are to be 2 ft (610 mm) from the ends of the steel column, and the other two 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 required locations of thermocouples on wide flange and tubular steel columns.
5.4 The temperature of the hollow section is to be measured by no fewer than four thermocouples located at each of four levels (minimum of 16 thermocouples). The upper and lower levels are to be 2 ft (610 mm) from the ends of the steel column, and the other two 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 required locations of thermocouples on tubular steel columns.
5.5 All thermocouples for the purpose of recording specimen temperature are to be fabricated from minimum 0.032 in (0.8 mm) diameter (No. 20 B & S gauge) chromel-atumel, inconel sheathed wires or equivalent having a time constant of 2 s or less.
5.6 The applied protection material is to be restrained against longitudinal thermal expansion greater than that of the steel column by attaching rigid steel plates or reinforced concrete to the 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.
5.7 The ends of the test specimen, including the means for restraint, are to have sufficient thermal insulation to prevent significant direct heat transfer through to the ends of the steel section from the furnace.
5.8 Prior to test, the test specimen is to be conditioned such that the dampest portion of the test specimen has achieved a moisture content corresponding to drying to equilibrium with air in the range of 50 to 75% relative humidity at 73 ±5F (22.8 ±2.8°C). If the protection product requires a different moisture content to perform as Intended, such moisture content may be allowed provided the moisture content and justification of acceptance are documented in the report, and the moisture content is included in the classification.
5.9 Moisture content equilibrium with air shall be determined to have been reached when successive weekly weighings of a representative specimen, prepared at the same time as the test specimen, indicate that the representative specimen has stopped losing weight.UL 1709-2017 pdf free download.