01. Where are the design factors referenced in AutoPIPE help coming from in ASME B31.4 Chapter IX (

Applies To
Date Logged
& Current Version
Sept. 2017


Design factors according to the code are:

AutoPIPE help has the design factors set to:

Why are they different?


The user is able to select 2 different codes from the General model options dialog:  ASME B31.4 Liq. Trans or ASME B31.4 OFFshore.

Table 403.3.1-1 shown above is for ASME B31.4 Liq. Trans piping, while AutoPIPE's help table shown above is for chapter IX (offshore piping) referenced by table A402.3.5-1 

These are the exact values as referenced in AutoPIPE's help. AutoPIPE will use the correct allowable values for the selected piping code. 

See Also

ASME B31.4 Chapter IX (Offshore) Piping Code Calculation

Bentley AutoPIPE