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Thanks Prex

Hi Prex Do you mean that L is the distance on center line of each of the miter or is the distance of the center of the elbow to each of the termination. thanks

ASTM B31.3 ON PARA.- 304.2.4 .- THE WALL THGICKNESS OF CURVED AND MITERED SEGMENTS OF PIPE SUBJECTED TO EXTERNAL PRESSURE MAY BE DETERMINED IN PARA.- 304.1.3 THE QUESTION IS ON A MITERED ELBOW WE CAN USE L THE DISTANCE OF EACH MITER SECTION ???? IF THE l IS OK TO HAVE THE PRESSURE REQUERIDDED...

Aditionaly the duct have reinforentd and the elbows and a TEE also

Thanks John the duct is 4000 mm diameter and have 8mm thikness D/t = 500 the external pressure is 100 mBar and the temperature is 760°F what is beam teory program , I have pipepak and I think use this teory ??

Im involved on a flexibility analysis of a hot gase duct that operate a external pressure . the mitered elbows have circunferencial reinforsment. how can I calculate the SIF incluiding that ribs.

This allowable stresses aplyy to ASME B31.3 ?

Do any know the allowable stress for 1500°F to 1650°F for incoloy 800HT

i WOULD LIKE TO KNOW THE MAXIMUM OPERATION TEMPERATURE FOR A PIPE OF INCOLOY 800HT