Exhaust Gas Compensators and Gaskets.docx

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JD Cope Exhaust Gas compensators and gaskets
Solicitation number
PE-75553-NONST-2026-000000059
Issued by
Georgia

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This is a specification document for exhaust gas compensators and gaskets required for a 56.8 MW gas-fired power plant located in Georgia. The procurement calls for eight line items totaling 45 individual components: three DN 2000 compensators, six DN 1600 compensators, three DN 450 compensators, three DN 450 axial compensators, and 45 gaskets in various sizes (DN 450, DN 1300, DN 1600, and DN 2000). The compensators are designed for installation in the exhaust gas system between the mixing pipe and SCR catalyst, as well as in flushing pipes. All compensators feature multi-layer bellows constructed from stainless steel materials (1.4571, 1.4541, or equivalent ASME specifications) with swivel flanges and welded seam connections. The compensators must accommodate specific movement requirements including axial, lateral, and angular displacement across 1,000 load cycles at operating temperatures of 530°C and pressures up to 0.49 barg, with emergency pressure ratings of 1 barg. The gasket specifications call for AF-ST composite material with aramide fibers, NBR-binder, and galvanized iron expanded metal with anti-stick coating, sized at 2 mm thickness for DN 1600 flange connections.

The specification document does not contain information regarding pricing terms, set-asides, incumbent contractors, response dates, due dates, site visits, bidder conferences, award dates, contract term, renewal options, or funding sources and amounts. These details would typically be found in the associated solicitation or contract opportunity notice rather than in the technical specification document itself.

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Pos 1. Compensator DN 2000, 3 pcs Compensator for installation between mixing pipe and SCR catalyst.

DN 2000 (78 8/16”), installation length 1100 mm (43 5/16”), not pre-stressed.

Central pipe and multi-layer bellows made of material 1.4571 (or 316Ti / ASME AS 240ASTM A 240), connected by up-weld seam (no rolling seams), with swivel flanges on both sides according to DIN 86044-1, both flanges made of material 1.4571 (or 316Ti / ASME AS 240ASTM A 240).

Formation of steam bubbles between the bellow layers must be avoided by a suitable measure, e.g., a relief hole in the outer layer.

Movement:

· Axial - 140 mm (5 1/2“)

· Lateral +/- 10 mm (7/16“)

· Angular 0° Load change 1000 cycles Temperature 530°C, medium exhaust gas from natural gas, MDA, MDB, MGO, or HFO.

Exhaust gas velocity: approx. 25 m/s (100% engine load) Operating pressure up to 0.49 barg Emergency pressure 1 barg.

Connection material to ducting (screws) by others

Pos 2. Compensator DN 1600, 6 pcs Compensator for installation between mixing pipe and SCR catalyst.

DN 1600 (63 12/16”), installation length 985 mm (38 12/16”), not pre-stressed.

Central pipe and multi-layer bellows made of material 1.4541 (or 321 / ASME SA 240/ASTM A 240) , connected by up-weld seam (no rolling seams), with swivel flanges on both sides according to DIN 86044-1, both flanges made of material 1.5415 (16Mo3).

Formation of steam bubbles between the bellow layers must be avoided by a suitable measure, e.g., a relief hole in the outer layer.

Movement:

· Axial - 100 mm (4“)

· Lateral +/- 20 mm (14/16”) (spring rate shall not exceed 550 N/mm)

· Angular 0° Load change 1000 cycles Temperature 530°C, medium exhaust gas from natural gas, MDA, MDB, MGO, or HFO. Exhaust gas velocity: approx. 30 m/s (100% engine load) Operating pressure up to 0.49 barg Emergency pressure 1 barg.

Connection material to ducting (screws) by others

Pos 3. Compensator DN 450, 3 pcs Compensator for installation in flushing pipe.

DN 450, installation length 600 mm (23 10/16”), not pre-stressed.

Central pipe and multi-layer bellows made of material 1.4541 (or 321 / ASME SA 240/ASTM A 240), connected by up-weld seam (no rolling seams), with swivel flanges on both sides according to DIN 86044-1, both flanges made of material 1.5415 (16Mo3).

Formation of steam bubbles between the bellow layers must be avoided by a suitable measure, e.g., a relief hole in the outer layer.

Movement:

· Axial +/- 50 mm (2”)

· Lateral +/- 10 mm (7/16“)

· Angular 0° Load change 1000 cycles Temperature 530°C, medium exhaust gas from natural gas.

Exhaust gas velocity: approx. 30 m/s (100% load) Operating pressure up to 0.49 barg Emergency pressure 1 barg.

Connection material to ducting (screws) by others

Pos 4. Axial Compensator DN 450, 3 pcs Compensator for installation in flushing pipe.

DN 450 (18”), installation length 325 mm (12 13/16), not pre-stressed.

Central pipe and multi-layer bellows made of material 1.4541 (or 321 / ASME SA 240/ASTM A 240), connected by up-weld seam (no rolling seams), with swivel flanges on both sides according to DIN EN 1092-1, both flanges made of material 1.5415 (16Mo3).

Formation of steam bubbles between the bellow layers must be avoided by a suitable measure, e.g., a relief hole in the outer layer.

Movement:

· Axial +/- 10 mm (7/16“)

· Lateral +/- 1 mm (1/16”)

· Angular 0° Load change 1000 cycles Temperature 530°C, medium exhaust gas from natural gas.

Exhaust gas velocity: approx. 30 m/s (100% load) Operating pressure up to 0.49 barg Emergency pressure 1 barg.

Connection material to ducting (screws) by others

Pos 5. Gasket DN 450, 9 pcs Gasket for flange connection DN 1600, thickness 2 mm Material: AF-ST (Composite material for flat-gaskets, aramide fibres with NBR-binder and galvanized iron expanded metal, anti-stick-coating)

Pos 6. Gasket DN 1300, 6 pcs Gasket for flange connection DN 1600, thickness 2 mm Material: AF-ST (Composite material for flat-gaskets, aramide fibres with NBR-binder and galvanized iron expanded metal, anti-stick-coating)

Pos 7. Gasket DN 1600, 21 pcs Gasket for flange connection DN 1600, thickness 2 mm Material: AF-ST (Composite material for flat-gaskets, aramide fibres with NBR-binder and galvanized iron expanded metal, anti-stick-coating)

Pos 8. Gasket DN 2000, 9 pcs Gasket for flange connection DN 1600, thickness 2 mm Material: AF-ST (Composite material for flat-gaskets, aramide fibres with NBR-binder and galvanized iron expanded metal, anti-stick-coating)

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