I have a set of chillers that require at least one to be layed up for the winter months. Three years ago we laid Machine 1 up from December-April. On start-up we found more than half of the tubes had burst. We attribute the failures to poor layup practice and installed low point drains in every...
I have a vertical downflow line from the bottom of a scrubber to an accumulation tank. A horizontal branch line exists on the down line. There is a on/off valve on the branch line after a short section of connecting pipe. We have suspected that this line is plugging over time due to passing...
I am trying to estimate loading from a new operation of emptying bulk bags into a grinding system and then emptying into a slurry tank. Due to the nature of the moisture involved with the slurry tank, I am prone to think that I should avoid fabric filter dust collectors. We have used venturi...
I have been reviewing some old documentation for environmental permitting at the facility I work. We use filter baghouses with forced draft to collect dust from unloading processes. The material is unloaded to the baghouse then is gravity fed from the baghouse through a rotary valve to the...
I have a deaerator with a surge tank below to serve as Boiler Feedwater to gas fired boilers. We use a sulfite for oxygen scavenging. The deaerator has a continuous blowdown line for further non-condensables removal.
Somewhere along the line, someone advised the plant population that a 18-inch...
I was reading the thread1203-155099. I had a few followup questions....
We have a problem with birds and occasionally bees.... no pun intended. We have drilled the weep holes to address the rain issue.
I have seen over the years, use of fine screens on the end of the tail pipes to discourage...
I am looking for information on ths subject. I have found much literature saying that the reaction is violent and the application is not a good one, but I am trying to investigate an incident and would like to hear details and descriptions of any experiences with the reaction.
I have a system in which there is a mixture of NH3, air, and H2O. After reading a few inter-company reports from the early 70's, I am confused by the way that the report writer and his associates seem to use the term of flammability aand explosive interchangably in regards to an envelope. This...
I have heard a few diffenrent opinions about the subject. We had a Carbon steel with epoxy coating tank with PVC internals and outlet piping. New construction is 304 SS tank - we have just had a failure within less than one year.
We use a sodium chloride brine solution to regenrate the beds...
I have heard a few diffenrent opinions about the subject. We had a Carbon steel with epoxy coating tank with PVC internals and outlet piping. New construction is 304 SS tank - we have just had a failure within less than one year.
We use a sodium chloride brine solution to regenrate the beds...
I have a centrifugla pump that seems to "surge" at times. Let me explain.
This pump is circulation pump on a scrubber that is under a slight vacuum. This scrubber has instances every couple of hours where there is a slight surge in vacuum in the scrubber. During this time, the circulation flow...
I am looking for a technical explanation of why the gravel in the bottom of a water softener does not allo ion exchange resin to flow down through the bed. I" realize the difference in the relative size, but is this the only reason that it does not flow down through? It seems as if there would...
I have been accustomed to checking dew points on tanks (while air purging) to achieve a -40º dew point. I am unsure why we use this temperature - it is just what we have always done here as well as other plants I have worked. I did some quick internet checks and I see this same number show up...
I have heard conflicting arguments about the restart of a boiler after being chemically cleaned (or after lay-up). One method employs the rechraging of the boiler with normal boiler feed water (140ºF) while the other uses "ambient" water. It seems logical to me that boiler feedwater should be...
I was wondering if anyone had some general rules of thumb for design of insertable tank heaters especially in regards to quantifying/identifying required heat loads. I have looked at examples that Tranter offers and got a few ideas...
I am faced with replacing an existing heater in an existing...
Our plant has just leased a package boiler as a backup to our exisiting boiler for the winter. They are essentially identical (small - fire-tube boilers). We are wanting to run the boilers in a lead/lag situation with the rental being the lag. We want to keep both units running continuously as...
