Maximum LOX and RP1 velocity in the propellant feed system

[Cryos842]

Hey everyone,
I'm currently in charge of designing a LOX/RP1 system with LOX flow rates up to 25 kg/s. I've always known for liquid flowing velocity, especially ones like LOX to be below the 5 m/s threshold. Are there references where this number is derived? I understand potential risks with higher velocities including increased friction and thereby higher likelihood of ignition, but are there any references I can refer to directly? I am searched through Sutton's and multiple of NASA's guidelines and see none that gives a number directly and was hoping for an answer here. Thanks in advance.

 

[btrueblood]

5 m/s sounds like a general plant piping spec. I think the feed system on a rocket engine can have higher velocities, given that cleanliness and inspection frequency will reduce the likelihood of FOD ignition sources. I'd expect you have looked at the following:

https://dl.astm.org/stps/book/229/chapter-abstract/64042/Development-of-a-Liquid-Oxygen-Facility-for-Rocket?redirectedFrom=fulltext

https://ntrs.nasa.gov/api/citations/19960021046/downloads/19960021046.pdf