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I had thought of that, but I am having trouble rationalizing what the driving force during the layup would have been to have the failure burst. Before we laid the machine up, we had no problems. There was no water in the refrigerant, so the burst must have heppened during the layup period. Any...

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...

Thanks for the replies. The baghouse in the case described is really part of the process, but it is considered an Air pollution control device to keep particulate from escaping to the ambient air. There is an airlock below that allows the material to be removed from the baghouse. My new...

Thanks for all of the feedback... Wet grinding was not advised due to the "caking" up possibility on the grinding equipment and housings.We looked at dropping it through a venturi type device ("liquid slurry eductor") but management frowned on this due to our lack of experience with this type of...

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...

Dear mbeychok, I am humbly writing in response to my inappropriate response from a few days ago. Please accept my sincerest apologies. I am sure that given your wealth of years within both industry and in life, that you too have.... reached a breaking point. Indeed, I have met mine. I have...

rmw, thank you for your response and demonstrated ability to understand a problem and answer the question, despite the phrasing. I did indeed mean "blow-off" from the top of the deaerator. I was unaware of the history progression that you offered. Again, many thanks. mbeychok, thanks for 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...

The 304 SS failed. I was trying to understand if using SS is a no-no in softener service. Furthermore, waht role in that determination, is attributable to NaCl brine?

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...

Update..... We changed the pump to a more appropriate size pump. I asked for an open impeller, but somehow that got forgotten on the spec. We will be installing during the next outage. The problem of the surging has not gone away. Essentially the sam symptoms occur... When the sudden process...

Sorry for the confusion. The pump circulates a total of 250 gpm but it splits to 3 different locations - 175 gpm to the packing, 75 gpm to a quench spray, and the balance as a transfer out of the system (feed to a process). I am trying to visualize the entrained air possibility. I guess air...

The "normal" operating pressure is about 3 inches of water column (vacuuum) above the liquid level in the feed tank. The surge is a pressure of about 10 inches of water column (vacuum) above the liquid level in the feed tank. hbw, the pipe reducers are flat on top. I am not sure what you mean...

I do not know of any vapor accumulation points. The pump feed tank is elevated above the pump such that there is 10 feet of static suction head available. I have calcualted the NPSHA to be >20 ft with a NPSHR <4 ft. One other issue that I have concern about is the tank turnover. The tank's...