Flare Header Capacity
Flare Header Capacity
(OP)
ok, this one's interesting. I'm trying to establish the rate at which we can blow down a pig receiver to the main flare header. The line is 410' of 4" Sch 80 and is rated for 600# ANSI and ties-in to the 16" main header.
Based on using say 0.50 mach, the rate looks like about 7 MMSCFD. However, why can't I force this rate up to say 20 MMSCFD and have a standing pressure wave in the line? The line will simply pressure up to the point where the outlet velocity is at mach 1. Since the line is rated for 600# ANSI, can I use the line as a restriction orifice up to where the downstream pressure is at critical flow?
Thoughts anyone?
Based on using say 0.50 mach, the rate looks like about 7 MMSCFD. However, why can't I force this rate up to say 20 MMSCFD and have a standing pressure wave in the line? The line will simply pressure up to the point where the outlet velocity is at mach 1. Since the line is rated for 600# ANSI, can I use the line as a restriction orifice up to where the downstream pressure is at critical flow?
Thoughts anyone?





RE: Flare Header Capacity
RE: Flare Header Capacity
RE: Flare Header Capacity
I think I'll put an orifice or choke nipple in the line to limit system flow to a preset # if the operator cranks the globe valve wide open. I'll review pipe supports and clamps to make sure we're covered on the vibration issue.
RE: Flare Header Capacity
Other than the pipe support & clamp, suggest to review the piping integrity as well.
RE: Flare Header Capacity