Severe cyclic condition

Severe cyclic is not a fluid service

305.2.3 Pipe for Severe Cyclic Conditions

(a) Except as limited in (b) through (d) , only the following pipe may be used under severe cyclic conditions:

(1) pipe listed in Table A-1A , where Ec ≥0.90 or

(2) pipe listed in TableA-1B , where Ej ≥0.90

(b) For API5L pipe , only the following materials may be used:

Grade A or B , seamless

Grade A or B , SAW,str.seam, Ej ≥0.95 

Grade X42 , seamless 

Grade X46 , seamless 

Grade X52 , seamless 

Grade X56 , seamless 

Grade X60  ,seamless

(c) For copper pipe  ,only ASTM B42 may be used.

(d) For copper alloy pipe , only ASTM B466 may be used.

(e) For aluminum alloy pipe , only ASTM B210 and B241, both in tempers O and H112 ,may be used.

• Proprietary “Type C” lap-joint stub-end welding fittings shall not be used under severe cyclic conditions. A flared lap is not permitted under severe cyclic conditions
• A miter bend to be used under severe cyclic conditions shall be made in accordance with para. 304.2.3 and welded in accordance with para. 311.1, and shall have an angle α (see Figure 304.2.3) ≤ 22.5 deg.

• Socket welds larger than DN 50 (NPS 2) shall not be used under severe cyclic conditions.
• Expanded joints shall not be used under severe cyclic conditions.