So this brings up another issue I have struggled with. Which material is better in a condensing type natural gas fired boiler where the water is condensed using the flue gas like a heat exchanger application inside the boiler for better efficiency? The exhaust contains chlorides (bad for...
condensate return pump should be twice the load as a minimum making sure it has enough head to pump back to wherever its going.
You would only need a bypass line in your boiler feed pump if the pump is vastly oversized or running continuous with a modulating feedwater valve on your boiler.
Not sure where you are wanting this vessel shipped but it is small enough that you should get someone local. This is something fairly easy for someone with an ASME section VIII stamp. This can be found by doing a internet search for your local area or in the U.S. a book is published for each...
There are other issues of adding make-up water to the deaerator instead of to the condensate tank. ONe is the retention time and how you are going to control putting condensate into the deaerator and how you are going to control putting make-up water into the deaerator? Typically, if water is...
It sounds as though these are a couple of 500HP low pressure steam boilers. 15# means 15 psig which is the design of the boiler and would be an ASME Section IV unit. This should be found on the ASME data plate with a little "H" in the clover leaf that is on the ASME nameplate. Quick...
You asked alot of questions. Wind does have an effect. According to my map from the US weather bureau the lowest one-day mean temperature for that area is around 25F below zero. Not sure if you have a elevated steel tank or a steel suction tank but I will assume a steel suction tank. Based...
b8checker:
No, on both accounts. The surge tank needs protection because of the temperature changes that are occuring with the incoming water and the fact that the water in the surge tank is exposed to atmospheric conditions. As water temperature changes occur more or less gasses become...
How are you going to get water into your boiler if the water inlet pressure is less than the boiler operating pressure?
There are two types of electric boilers; electrode and resistance heating. Both are basically a tank with elements immersed in the water. ON a steam boiler the top portion...
I know of carbon steel deaerators that have been in service for 50 years. My experience is that any steel containing carbon is susceptible to oxygen attack. However, at 7 ppb makes the "attackers" very minimal and basically has no effect on the life span of a deaerator if the...
I agree with you on the relief valve and PRV comments. Anytime a PRV is supplied the RV HAS to be able to relieve the full capacity of the PRV if stuck wide open (per ASME and common sense!) THe PRV and relief valve should be supplied by the same company. THere is no way to supply a RV...
TBP - I agree on operating the DA giving a cushion. I was referencing before the water reached the storage area. If I have a DA designed for 20,000 #/hr (for example) but my condensate is collected at different stations and all comes back at once my DA connections and internals are not sized...
A condensate tank before a deaerator is commonly called a surge tank. There are only two reasons that I can think of to need one: 1) If you have gravity returns coming back that cannot overcome the deaerator pressure then it would need collected and 2) If you have several condensate stations...
