Metallic Expansion Joints - Thorburn Flex Inc
Metallic Expansion Joints - Thorburn Flex Inc
Metallic Expansion Joints - Thorburn Flex Inc
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THORBURN<br />
FLEXIBLE PIPING SPECIALIST<br />
TYPICAL DESIGN SPECIFICATIONS FOR<br />
THORBURN METALLIC BELLOWS TYPE EXPANSION JOINTS<br />
INTRODUCTION<br />
■<br />
To provide a sample specification for the fabrication, inspection and shipping of metallic bellows type expansion<br />
joints. Certain optional procedures are shown and will be followed when specified.<br />
DATA REQUIRED<br />
Size Qty Dimension limits<br />
Axial Motion (Compression)<br />
Extension<br />
Lateral Motion<br />
Angular Motion<br />
Design Pressure (Internal)<br />
(External)<br />
Design Temperature ºF or ºC<br />
Cycle Life<br />
BELLOWS ELEMENT<br />
■<br />
Manufactured from large sheets producing longitudinal welds only. All welds planished to within 3% of parent metal<br />
thickness. Material thickness of sheet to be within commercial tolerances.<br />
MATERIALS<br />
■<br />
■<br />
Bellows – T.321 stainless steel is standard. Readily available in T.316, T.304, Monel, <strong>Inc</strong>onel, <strong>Inc</strong>oloy, Hasteloy, etc.<br />
in thicknesses to .187". Materials shall be free from imperfections that would interfere with the purpose designed.<br />
All materials to meet ASM or ASME Code Section II if applicable.<br />
DESIGN<br />
■<br />
■<br />
<strong>Expansion</strong> joints are designed to meet known requirements of EJMA, ASME B31.3 Appendix X or<br />
ASME Section VIII if applicable.<br />
The expansion joint shall be free of all control devices such as self-equalizing rings.<br />
DRAWINGS<br />
■<br />
■<br />
The approval drawing shall show all principal dimensions including the number, size and thickness of bellows,<br />
location and type of welds (optional).<br />
The drawing shall list the movement, pressure and temperature rating, materials, test pressure, order number and<br />
project name (optional).<br />
HEAT TREATMENT<br />
■<br />
When specified, heat treatment will be performed.<br />
WELDING<br />
■<br />
■<br />
■<br />
Unless otherwise specified, the welding procedures and welders shall be qualified to Section IX of the ASME Boiler<br />
and Pressure Vessel Code for all pressure containing welds.<br />
Longitudinal welds in bellows and transition pieces shall conform to ASME Section VIII and Section IX (optional).<br />
Welding of bellows to transition pieces shall be to Code Case 1177.7 (optional).<br />
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