dgsbsme
Mechanical
- Mar 9, 2005
- 39
I posted this in Mechanical/Piping & Fluid Mechanics section but haven't gotten any nibbles yet. I hope double posting isn't a problem.
I am trying to inject flashing (60psig to ~45psig) condensate into an 8"Ø, 180°F Water line. The 60psig condensate tank has a level control valve. I am trying to get someone to convert the controls to Off/On style operation to minimize pressure drop (thus flashing) at the level control valve.
The orifice plate I am trying to come up with will go on the end of an 2"Ø (or 2½" or 3") elbow inserted into the horizontal 8"Ø at its centerline, jetting downstream. Its purpose is to drop the lion's share of the pressure, and to keep the steam 'bubbles' away from the sides of the 8"Ø, 180°F water pipe (Sch 10S St.St.) to prevent cavitation type damage. The thinking is, higher velocity, directed down the centerline will result in smaller bubble stream diameter and condensing before reaching the pipe wall.
I have started by calculating a pseudo-density from the mass flow rate divided by the total volumetric flow rate (at upstream conditions). Then using the total volumetric flow rate divided by the number of orifices (eg. 9 orifices at 3/8"Ø). Someone else suggested figuring steam and condensate separately, each at its own density and using the sum of those calcs... that gave ~4 orifices at 3/8"Ø.
Clearly, no less than one of these approaches is wrong.
Anyone have a quick & dirty solution to this?
I am trying to inject flashing (60psig to ~45psig) condensate into an 8"Ø, 180°F Water line. The 60psig condensate tank has a level control valve. I am trying to get someone to convert the controls to Off/On style operation to minimize pressure drop (thus flashing) at the level control valve.
The orifice plate I am trying to come up with will go on the end of an 2"Ø (or 2½" or 3") elbow inserted into the horizontal 8"Ø at its centerline, jetting downstream. Its purpose is to drop the lion's share of the pressure, and to keep the steam 'bubbles' away from the sides of the 8"Ø, 180°F water pipe (Sch 10S St.St.) to prevent cavitation type damage. The thinking is, higher velocity, directed down the centerline will result in smaller bubble stream diameter and condensing before reaching the pipe wall.
I have started by calculating a pseudo-density from the mass flow rate divided by the total volumetric flow rate (at upstream conditions). Then using the total volumetric flow rate divided by the number of orifices (eg. 9 orifices at 3/8"Ø). Someone else suggested figuring steam and condensate separately, each at its own density and using the sum of those calcs... that gave ~4 orifices at 3/8"Ø.
Clearly, no less than one of these approaches is wrong.
Anyone have a quick & dirty solution to this?
