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Natural Gas Processing by Alireza Bahadori

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3.15. Flanges

3.15.1. Flange types

Flange types should be in accordance with the following considerations:
1. Flanges should normally be of the welding neck type.
2. Slip-on flanges should not be welded directly onto elbows or other fittings, and should be double-welded for all services.
3. PN68 (class 400) flanges should not be used.
4. Where flanges in accordance with other standards such as BS 3293 are required, because of adjacent equipment, a check calculation on the suitability of the flange design for hydrostatic test conditions should be made.

3.15.2. Limitation on flange facings

1. The facings of PN 20 (class 150), PN50 (class 300), PN100 (class 600), and PN 150 (class 900) flanges should be raised except where ring type joints are required, ...

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