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Significance and Use
4.1.1 For many years, brick liners have been used with an excellent record of performance. For the most part, however, the design and construction of brick liners has been based on past industry practice due to the lack of available information and knowledge of the physical properties of the brick and mortar, the thermal and seismic behavior of brick liners, and many related characteristics that were not properly or accurately defined.
4.1.2 The use of scrubbers, which lower gas temperatures and introduce highly corrosive condensates into the flue gas system, requires many new design considerations. The effect that scrubbers have on brick liners is an ongoing area of study, since a number of liners have experienced growth- and deflection-related problems which may be attributable, at least in part, to nonuniform temperature and moisture conditions within the liners.
4.2 Purpose—The recommendations contained herein represent current industry practices and serve to define the pertinent considerations that should be followed in the design and construction of brick chimney liners.
1.1 This guide covers procedures for the design, construction, and serviceability of brick liners for industrial chimneys. The structural design criteria are applicable to vertical masonry cantilever structures supported only at their base, either by a foundation, a concrete pedestal, or by some means from the outer concrete shell. Excluded from direct consideration are single-wythe, sectional brick linings that are supported on a series of corbels cast in the outer chimney shell.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C395 Specification for Chemical-Resistant Resin Mortars
C466 Specification for Chemically Setting Silicate and Silica Chemical-Resistant Mortars
C980 Specification for Industrial Chimney Lining Brick
E111 Test Method for Youngs Modulus, Tangent Modulus, and Chord Modulus
E447 Test Method for Compressive Strength of Laboratory Constructed Masonry Prisms
ACI Standard307–88 Practice for the Design and Construction of Cast-In-Place Reinforced Concrete Chimneys Available from American Concrete Institute (ACI), P.O. Box 9094, Farmington Hills, MI 48333-9094, http://www.aci-int.org.
ASCE StandardASCE7-88 Minimum Design Loads for Buildings and Other Structures (Formerly ANSI A58.1) Available from American Society of Civil Engineers (ASCE), 1801 Alexander Bell Dr., Reston, VA 20191, http://www.asce.org.
Other Standard1991 Uniform Building Code, International Conference of Building Code Officials, California Available from International Code Council (ICC), 5203 Leesburg Pike, Suite 600, Falls Church, VA 22041-3401, http://www.intlcode.org.
ICS Number Code 81.080 (Refractories); 91.060.40 (Chimneys, shafts, ducts)