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5.9 Caps
5.9.1 Caps should be ellipsoidal or spherical type.Butt welding flat caps may also be used instead.
5.9.2 The piping with PN≤25 may adopt flat welded caps，welded caps with reinforcement or conical caps.
5.9.3 Caps strength calculation shall comply with the provisions in 6.7 of this code.