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GL, I used to design these types of heaters, are they in steam/water service or petroleum product heating? Is this "fretting" as you call it occurring on all the tubes or just a few of them? On bottom suppoted heaters, this is a normal situation - the "guides" have to be pretty tight to prevent...

off the top of my head, I think for the non-prescriptive approach, you need to do a building simulation of a base building and the proposed building to demonstrate compliance - Many Software are available such as eQuest (free_, Carrier HAP, Trace, etc. These are fairly comlex programs, but its...

All of the above definitions are correct, a stack and chimney are essentially the same. THEY ALSO serve to create a draft effect (or stack effect) by maintaining a column of hot gas above a combustion chamber for instance. THis so-called "stack-effect" creates the needed pressure...

Hello, A few thoughts you may want to consider: 1. Consider installaing VAV terminal boxes to control the variable speed supply fan. In this case, the VFD for the small Hot water pump won't be necessary. This may be a cheaper option and will probably result in MORE energy savings because 75 HP...

MrStrohler, Now I think I understand your question better. Allowable stresses for all boiler materials are tabulated in the BPV -section 2 (materials) I beleive. The stress tables in the BPV utilize ASTM designations, so if you have a steel plate material, you can look up the allowable stress...

MrStrohler, In most cases I am familiar with, the air/flue gas ducts you are interested in are within the boiler vendor's scope up to some agreed connection point. For example, the economizer outlet may be the cut-off and then the stack vendor may take over - or the EPC company. So ducts are...

This is for a HVAC application - cooling tower serves a 125 ton electric chiller. JK

Can anyone suggest a resource or methodology about how to calculate the energy savings acheived by replacing a constant fan speed cooling tower with a VFD controlled cooling tower ? THANKS - JK

Falcon, Since Methane is about half as dense as Ethane, the gas pressure would theoretically need to be Doubled to keep the same SCF through the burner piping. BUt you should check what the max pressure the burner system can handle. Then, the control valves should be re-sized and an...

For Fired Heater optimization and Basics, I recommend reading the now classic, "Furnace Operations" by Robert D. Reed.

For rough sizing purposes, 250-300 sq.ft/ton is probably safe for the application, BUT as others have said, a proper load calculation should be performed to ensure sufficienct cooling capacity and dehumidifcation. J. KAtz

Does anyone know of a supplier or company who could design and provide a sparger to meet certain requirements? Anyone have experience designing/using spargers to heat a boiler using 250 psig steam? Any other resources would be helpful. THANKS Jon Katz

Is this for outdoor use or indoor use? If you expect the fins to hold up to weathering, its best to use a corrosion resistant material (i.e. stainless steel or such) If contact with water is not expected and temperatures permits you could use medium carbon steel fins. If you expect high fin...

MOst heating plants I've seen use 3 or 4 boilers or hot water generators. (12) will for sure be harder to control, harder to maintain ( and just unneccessary in my view) Not to mention will end up being considerably more expensive most likely. j. katz

THere are a number of variables that DIRECTLY affect the FUEL efficiency of a steam boiler so its hard to compare simplisticly Oil vs Gas only, depending on the specific composition of an Oil vs the fuel gas, the efficiency could be lower/higher in one vs the other... But they shouldn't vary by...

I am trying to understand your problem better. If I interpret correctly, the arrangment of this heater is: a Dual Helical coil heater, fired from the top, THe radiant section is the contained by the Helical coils? Where is the "convection section" - is there a seperate bank of...

This equation is essentially a statement of the first law of thermodynamics in terms of Avg. Cp (rather than enthalpies). Heat input (Q) = (Heat absorbed). -j.katz

What is the function of this heater? What type of OIL is being heated? Is this an OLD heater? Air and Flue gas enthalpies can be taken from any number of Eng. handbooks and will be equally accurate enough for what your trying to do. Maxwell's Hydrocarbon HAndbook has curves for both. If you can...

I have found the the Standard Handbook of Engineering Calculations" by HICKS to be quite useful. IT covers Such a broad range of topics, you can find a great deal of info in it. thanks for the idea ksuengrng, I never thought to check e-bay for engineering books. -j. katz

From the way you phrase the question, I assume that you have an operating furnace, and are trying to benchmark the performance? If that is the case, the you can determine the efficiency of the heater by accurately measuring the following with thermocouple and Flue gas analyzer: - Flue Gas temp...