S DOCUMENTThis specification covers reverse pulse jet baghouses, with induced draft fan, installed on packaged boilers fired by coal, coal and gas, coal and oil, or a combination of coal, oil and gas.

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OO-B-2925

3.8 Performance.

3.8.1 Particulate emissions. The baghouse shall meet the particulate emission standards required by the governing environmental agency(s) at the installation site as specified (see 6.2). Particulate emissions shall be measured using the test procedure required by the governing environmental regulatory agency as specified (see 6.2). The emissions shall be in compliance under all boiler operating conditions unless otherwise exempted by the regulations of the governing

environmental regulatory agency(s). These compliance exemptions shall be as specified (see 6.2).

3.8.2 Induced draft. The induced draft fan shall produce the specified draft at the boiler flue gas outlet when the boiler is producing the maximum flue gas volume and one baghouse module is off line. Performance testing shall be as specified in 4.4.1.

3.9 Construction. The baghouse shall be constructed for the design requirements (see 3.7), performance requirements (see 3.8), and the additional requirements specified herein.

3.9.1 Foundations. Unless otherwise specified (see 6.2), baghouses too large to be shipped assembled to the installation site shall be provided with the concrete foundations for the baghouse, fan, and ductwork supports when the baghouse is to be constructed at the installation site.

3.9.2 Structural. All necessary structural supports shall be provided, including fabricated skid and support bases, access platforms, ladders, and stairs. Structural supports shall be built to satisfy the specified earthquake construction zone requirements (see 3.7). Access platforms, ladders, and stairs shall be constructed in accordance with 29 CFR, Part 1910. Support steel shall be built to withstand the thermal expansions forces occurring during extended operation of the baghouse under maximum boiler firing conditions. The housing shall be capable of withstanding the negative internal pressure existing during operation.

3.9.3 Insulation. Baghouse and supplied ductwork shall be sufficiently insulated to maintain internal wall temperatures above the flue gas dewpoint temperature during all load conditions. Insulation material shall be nonasbestos. Insulation shall be held in place with insulation lugs spaced on not greater than 12-inch by 18-inch (304.8 by 457.2 mm) centers. The outside wall surface temperature shall be not greater than 60 F (15.56 C) above ambient air temperature when baghouse is operating at maximum capacity. Hot spot sources such as access doors, pressure taps and observation ports shall be fully insulated. The baghouse insulation shall be jacketed with aluminum lagging with a thickness of not less than 0.020-inch (24 U.S. Standard Gage) (0.508 mm)). The color of the lagging shall be as specified (see 6.2).

3.9.4 Ductwork. When specified (see 6.2), ductwork shall be furnished with the baghouse. Ductwork shall be insulated as specified in 3.9.3.

3.9.4.1 Ductwork routing. Unless otherwise specified (see 6.2), ductwork shall be provided from the baghouse to the boiler transition piece, from the baghouse to the fan inlet, and from the fan outlet to the stack transition piece. A bypass duct with an automatic damper shall also be furnished to allow flue gas to bypass the baghouse. Dimensions of the boiler and stack transition

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