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  1. bigsteve80

    Spring can or just bolt it?

    I am developing a vent to allow us to superheat a steam export line during startups (to be used 1 or 2 times a year). It will be a 3" SHC40 carbon steel pipe, with a silencer at the top (95 Lb). It will vent up to 50,000 Lb/hr of superheated steam, up to 750°F. I have a pipe rack structure...
  2. bigsteve80

    NH3 converter troubleshooting

    The CEMS for our reformer stack utilizes a NH3 converter, essentially a small vessel with stainless steel balls as packing. It's heated to 1300 degF or so, to oxidize the NH3 to NOx, and the NOx is measured before and after. We're having a problem with the new converters taking up to 6 days to...
  3. bigsteve80

    SH Steam leak in sensing leg

    I drew it that way out of convenience - the taps are on the side, and the pots are on the level with them.
  4. bigsteve80

    SH Steam leak in sensing leg

    Upstream. The sensing legs have condensate from the condensate pots down; the leak is before the condensate pot. Here's a sketch of what is happening.
  5. bigsteve80

    SH Steam leak in sensing leg

    We have a small steam leak in the upstream sensing leg of our steam export (750°F, 640 psig) billing meter, causing it to read low. It is before the isolation valve, and appears to be fragile (the leak is under insulation), so it will not be repaired until an outage. I'm drawing a blank, is...
  6. bigsteve80

    Cumulative toxicity of chemicals

    Can anyone point me to a location where I can get information on the cumulative toxicity of hydrocarbons on the bacteria in my bio-ox? I am looking at accepting a new stream; 2500 ppm methanol, 2960 ppm ethanol, 1050 propanol, 1340 butanol, 436 pentanol, 29 ppm C10H22, 24 ppm C11H24, 2.6 ppm...
  7. bigsteve80

    Lance (drum stinger) operated valve?

    I am considering a manual valve. The only concern is that it will be close to the ground, and an ergonomics issue. I also thought about a pneumatic-actuated valve with a smaller control valve at waist height; I was just looking for a simpler solution.
  8. bigsteve80

    Lance (drum stinger) operated valve?

    I am designing a small tank that will contain oil that will flush a drum lance (stinger), and it's associated pump and piping. I don't know if anyone even makes something that will do what I want, but I'm looking for a valve that will only open when the lance (1" stainless pipe) is pushed...
  9. bigsteve80

    Knockout pot sizing - high viscosity liquid

    I am trying to size a knock-out pot for a vent line in my process; it is off of a viscosity index improver blend, so the mist, when it settles, is very viscous and sticky. I am hesitant to use a mesh because of that; I am thinking an impingement plate and a couple of baffles inside of a...
  10. bigsteve80

    timed light circuit

    No - I want to have a quick way to indicate whether a pre-shift inspection has been done.
  11. bigsteve80

    timed light circuit

    I want to make as simple a circuit as possible, but can't figure this one out (I'm a ChE, so go easy on me). I want a circuit with 2 LED's - one red and one green. A clock will turn off the green and turn on the red every 12 hours (at 5 am and 5 pm). If someone pushes a button at any point...

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