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1310.7.2 Metallic Flexible Joints
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Metallic flexible joints shall be permitted in the pipeline where required for expansion joints, seismic protection, thermal expansion, or vibration control and shall be as follows:
- For all wetted surfaces, made of bronze, copper, or stainless steel.
- Cleaned at the factory for oxygen service and received on the job site with certification of cleanliness.
- Suitable for service at 300 psig (2068 kPa) or above and able to withstand temperatures of 1000°F (538°C).
- Provided with brazing extensions to allow brazing into the pipeline per Section 1309.4.
- Supported with pipe hangers and supports as required for their additional weight. [NFPA 99:5.1.10.11.6.3]
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