Lateral Vesselet Lateral Vesselet stressfan (Petroleum) (OP) 8 Mar 12 14:46 My project specify a Lateral Vesselet for branch connections to a flare header. Is a Lateral Vesselet stronger than a BF Latrolet?Is there a way I can determine the SIF for a Lateral Vesselet?Thanks. RE: Lateral Vesselet richay (Mechanical) 18 Mar 12 10:56 The piping codes B31.1/B31.3 (and their SIF equations) don't address laterals. You have two options:1) Ask the vendor of the fitting, or2) Perform your own FEA to determine these values. Richard AyIntergraph CAS RE: Lateral Vesselet stressfan (Petroleum) (OP) 18 Mar 12 11:35 Thank you Richard.