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hey thanks again for jumping in. I do appreciate the help and the comments do help me (force?) me to understand the nuances....I'll see you guys on another topic!

Big Inch....not sure who are you directing your comments too and I'm not clear on what you are intending to discuss. I think we all understand that the loops are the same. You've made that point earlier. The other folks are trying to address my comment about adding in a future HXT loop. It...

..thank you for your comments. If, as you suggest, we have "heating set up somewhere from the tank to the pump suction flange", won't we need to increase expansion tank pressure? (Assuming that NPSHa-NPSHr <0?) thanks Quark! Not sure what the incentive is for you to answer these kinds of...

discharge becomes suction at some point right? If we don't have to increase bladder pressure, (if NPSHa-NPSHr>0)then we won't. (right?) I was trying to understand what happens when we break into the circuit and "extend" the suction line (see above...). thanks for your comments. They help me...

thanks TBP - I don't think Big Inch was stating anything different. I was asking what happens when addtional suction piping is added to a closed loop, such as the one in the diagram he posted. If we were to, say, "extend" the suction piping 60 feet or so to a "new" boiler or other heat...

thanks BigInch....interesting. NPSHA on a closed loop is just as important then, as open loop.

thank you BigInch! This is what I have done...I was not clear on the technique. Another question; anywhere on the loop? Seems that I could reduce the NPSHA to it's lowest value by picking, say the point at which is both the highest elevation and the longest run to the pump. A centrigal hot...

Hi everybody... thank you for being a resource for engineers everywhere! I have a project where we are going to replace a hot water boiler with a cogen driven heat exchanger. The heat exchanger is going to take the place of the boiler, as the heat generating device. It will be about 60 feet...

thank you HMROSS... that was an excellent description of what I am trying to hunt down....(little did I know as I started this thread!) Is there a way to equate the two? To replace the thermal mass of 2' of earth with a thermal insulator of certain R value? I am looking to insulate the top of...

thank you Focht3....in the construction world, they use R value as the reciprocal of thermal conductivity...but thanks for your comments. Apparently it is not something that is general enough for use...you barked right up my tree with your comments; we are trying to estimate the amount of...

thanks gentlemen.... I especially appreciate the rule of thumb. The science of all of this complicated, but obviously the simple stuff is that resistance of dirt is a function of its moisture content. I am looking to replace a couple feet of fill above a concrete reservoir with an insulation...

thank you very much. I've seen this as well, seems this subject is complicated. I appreciate your time.

Hello.. would anyone know why I could get typical R values of earth fill? I am looking into the feasability of replacing the thermal insulation of a couple feet of earth with some sort of insulation.... this would be for the roof of a buried concrete structure. We could then try to reduce the...

hey - thats a good tip - thanks.

thank you, gentlemen, for your comments and insights.

Does anyone know of an effective method of lining carbon steel tanks? We have several small process (less than 5000 gals) tanks that are rusting away. Rather than replace them - is there another way to save them or lengthen thier life? We've considered stainless steel cladding, some sort of...

Thank you for your replies. Spraying water may work. Anti-foams probably won't work because the foam is of a food substance.

I'm hoping someone with more experience than I could help me with an application: we are using a clarifier to remove scum from our process. The scum is very foamy and flows off the top of the clarifier and to a tank along with the wash down water. Is there some application or plumbing scheme...