Design Factor for liquids line in HCA
Design Factor for liquids line in HCA
(OP)
Newbie question: I've heard before that the design factor for a hazardous liquids line in an HCA is 0.5, but I can't find this in the CFR or where this came from. Can someone direct me to the right resource? Thank you.





RE: Design Factor for liquids line in HCA
How did the question arise?
RE: Design Factor for liquids line in HCA
RE: Design Factor for liquids line in HCA
RE: Design Factor for liquids line in HCA
The value of F used in this Code shall be not greater
than 0.72. Where indicated by service or location,
users of this Code may elect to use a design
factor, F, less than 0.72.
Do Note that in Appendix covering OFFSHORE LIQUID PIPELINES, DF is 0.60 for platform piping and risers.
RE: Design Factor for liquids line in HCA
Therefore you are probably trying to prove a negative and can't find anything because it doesn't exist.
Sounds to me like a typical expression by someone who has "heard of it" and "its in the code", without ever being specific about where they heard it or which code and which section. Happens a lot.
AFAIK, HCA is not a concept used for liquid lines which stay liquid at atmospheric pressure (i.e. not LPGs).
For liquid pipelines you can decide to use a DF <0.72 t your discretion and determined by the particular situation. Many choose to do this at e.g. road crossings or directional drills where any corrosion (internal or external) would be difficult to repair.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Design Factor for liquids line in HCA
and other hydrocarbon products, anhydrous ammonia and slurries transported "predominantly" as a liquid.
Addressing your vapor pressure concern is a consideration for radius of hazardous cloud determination.
See the special provisions for LPG
Mainline valve spacing 434.15.2
Inspection intervals 451.5 (2 X typical liquid line)
Integrity Safety Precautions 451.6
454 Emergency Management
Running Pumps during Emergencies
Vapor Cloud range determination