ASME B31.9 2004
BUILDING SERVICES PIPING
Section 930.2 Mechanically Formed Extruded Outlets in Copper Tube
(a) Mechanically formed extruded outlets shall be perpendicular to the axis of the run tube (header). They shall be formed by drilling a pilot hole and drawing out the tube surface to form a collar having a height of not less than three times the thickness of the branch wall.
(b) The inner branch tube end shall conform to the shape of the inner curve of the run tube. Insertion of the branch tube shall be controlled to assure alignment with specified depth into the collar without extending into the flow stream so as to provide internal reinforcement to the collar.
(c) Branches can be formed up to the run tube size as shown in ASTM F 2014. Forming procedures shall be in accordance with the tool manufacturer’s recommendations.
(d) All joints shall be brazed in accordance with para. 928.1
(e) The allowable pressure for the joint shall be the lowest value calculated by Eqs. (10), (11), or (12).
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ASME B31.9
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