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Fire-resistance Ratings of Structural Steel Used in Petrochemical Facilities
This category covers hourly fire-resistance ratings of steel columns intended for use in petrochemical facilities investigated using a rapid rise fire exposure.
Designs are investigated in accordance with the test method and acceptance criteria in ANSI/UL 1709, "Rapid Rise Fire Tests of Protection Materials for Structural Steel." The fire ratings in this category are similar to the ratings for columns covered under Fire-resistance Ratings (BXUV), except for the following two major differences: (1) the rate of temperature rise of the fire exposure, and (2) the inclusion of environmental exposure simulating potential environments in which the fire-resistive assemblies may be located. The temperature of the fire exposure in which rapid temperature rise ratings are established reaches 2000°F within the first 5 minutes of the fire exposure test.
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Guide Information - For general information on Fire-resistance Ratings - ANSI/UL 1709 (BYBU) Scope of ANSI/UL 1709 UL Qualified Contractor Program
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Numbering System for Designs:
The assemblies covered under this category are identified by an alphanumeric identification system consisting of XR followed by three digits starting with 2, 3, 6, or 7. The XR indicates a column investigated for rapid rise fire exposure, and:
- 200 series designs with mat protection,
- 300 series designs with mineral and fiber board protection,
- 600 series designs with mastic coatings,
- 700 series designs with spray-applied fire-resistive materials (SFRM).
SEARCH HINTS: To search for a particular design, enter the design number in the above search field. To search for designs within a series enter the alpha character(s) followed by the first numeric character and an * (e.g., searching for XR7* yields result for all XR700 series designs). Refer to the numbering system to identify suitable design numbers. If your initial search yields an excessive number of matches, select "Refine Your Search" and tighten the search parameters using the desired hourly rating, company name of components used in the design, and other key words.