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  • Users: bethw
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  1. bethw

    flow rate through an orifice for boiler blowdown

    Okay, okay, I give up, I can't seem to locate my chart or formula for the rate of flow through an orifice. It's in our continous blowdown line, the delta P is 90 lbs and the orifice size is 3/8". Can anyone help jog my memory?
  2. bethw

    Polymer boiler water treatment program

    So, if phosphates form a sludge, does the polymer product do the same thing? Or does it keep it in suspension and dispersed somewhat?
  3. bethw

    Polymer boiler water treatment program

    We use a polymer based boiler water treatment program here where I work. I have had only phosphate programs where I've been before, and the blowdowns there were constant to remove sludge, solids, etc. Now with this program, since from what I understand maintains things in solution (and that's...
  4. bethw

    Salt slippage

    I am going to have the resin tested to eliminate it from the equation. All three vessels have the same results after each one is regenerated. We just can't seem to pinpoint what the problem is so we will check this first. They seem to be passing more hardness after each regeneration as time...
  5. bethw

    Salt slippage

    I'll post complete information tomorrow when I get back to work. For now: the system is less than two years old, it was new when installed likewise the resin. There are three tanks 13X54. Our boiler pressure is 90 lbs. and we average 90%+ returns. Daily usage right now of 4,000 gallons or so...
  6. bethw

    Salt slippage

    The problem is common to all three tanks and each has the same CL residual reading after each is regened with the extended rinse time and the small amount of hardness that is coming through. That is what pointed me in this direction. Each unit is isolated when the sample is taken to insure that...
  7. bethw

    Salt slippage

    Wash water is the inlet water to the tanks. It's the same for all three, they are on a common header. 7ppm
  8. bethw

    Salt slippage

    We increased the rinse time from 30 to 45 minutes but have seen no change in the chloride level of the effluent. It seems to "bottom out" at the 20ppm level. These units regen a litle differently than other softeners: There are only 3 steps in the regen cycle. The first is the brine draw which...
  9. bethw

    Salt slippage

    The chloride level in city water supply 7 ppm. Softener effluent 20 ppm. Our boilers have 250-300 ppm in them, would like 150 or so. The hardness from each tank is 1 or less ppm measured as CaC03. I'll have to get the boiler water hardness tomorrow when I get back to work. Our water...
  10. bethw

    Salt slippage

    We have a water softening system here in our plant that consists of 3 tanks. They are sold by Braswell. This system is about a year old and has run well until about 3 months ago when each of the tanks started to slip sodium. It has been cycling up in the boilers. The amount of slippage in...
  11. bethw

    Steam per cubic ft of natural gas

    Thanks to all. Yes it did begin to sound like it was magical. I can easily add the zero and get a much more realistic number in the 1.04ish range. Beth
  12. bethw

    Steam per cubic ft of natural gas

    The steam flow sensors are Spirax Sarco coupled with Foxboro readouts. I have extensive documentation on thier calibration, serial numbers correction factors. We have three identical and each reads very close to what the other reads under identical boiler conditions. They are temp and pressure...
  13. bethw

    Steam per cubic ft of natural gas

    Our boiler pressure is about 90lbs, being firetubes, its saturated of course. Using the gas meter outside, the one we're billed on, and the steam totals from our individual boilers, I come up with these numbers. Everything seems to jive. I'll check again though, the steam numbers may be the...
  14. bethw

    Steam per cubic ft of natural gas

    We have firetube boilers here and crunching the numbers, I arrive at 10lbs steam produced per ft3 of gas. Is this number in the ballpark based on other peoples experience? I'm using this to emphisize effeciency numbers on each boiler. We are running in the low 80's.
  15. bethw

    Deaerator temperature

    This must be because there is no such thing as superheated water. Any "extra" entalpy above the saturation temp. would be used to heat the condensate up to saturation? Sounds like an extra effiecent way to deaerate. Bethw
  16. bethw

    Deaerator temperature

    Our plant has a DA that is maintained at 5 lbs. It is supplied by steam from a prv. The steam pressure before the prv is 85 lbs. If I remember my basic thermo right, because this steam comes through a prv, it is superheated when it is reduced to the 5 lbs. Using what I remember about the...
  17. bethw

    Vent valves

    I do not see any such lever on these, just the manual lift that all SRV's have. And yes these are power boilers 150 psi they run about 85 in the header.
  18. bethw

    Vent valves

    I've come across a situation in a hospital where the newly installed boilers are not fitted with any type of valving on top for venting. The riser pipes are there but they are capped. Venting is now being done with a small petcock on top of each sight glass. They are now faced with the task of...
  19. bethw

    Effect of temp. on phosphate readings

    Being Mechanical and not so chemical, I am not sure of this: What effect does sample temperature have on our boiler water phosphate sample tests? Our local operators say temperature does have a bearing on the result. And how about a silica test? I am designing a cooling system for the water...
  20. bethw

    Demin regen problem

    Our plant has two demin trains, anion and cation type. Beads are 1 year old in one unit and 2 months old in the other. When we regen our units, we measure the SiO2 in the effluent to determine if the regen has been successful. Recently, we have had trouble with our regens in regards to getting...

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