Most pumps have a smaller outlet size than inlet, and both are usually smaller than the piping. As for speed, 1800 rpm seems to be a standard in most HVAC applications, however if you have high head and low flow, the 3600 rpm option will give a much more economical pump and also more efficient...
There are commercially available systems just for this need. They are sized pretty small, not for the initial fill but to keep the pressure in the system in case of small outflows and pressure drops. Look at attachment of one we have used.
Joe Lambert...
If I understand the question, it sounds like the initial fill of the system, where the city water pressure may be too low to top it off due to the static head. I have seen some contractors use a little pump they temporarily hook up, first letting the city water fill until the max pressure is...
Butterfly valves will have tighter longer lasting shut-off for either a liquid or a gas. With soft seats you can get bubble tight shut-off, and even upwards of ANSI Class VI with metal seats. You can NOT get these types of shut-off's with gates. You can get a gear operator that gives them...
I'm working with a guy using a 30-40% glycerine solution directly in his fire tube hot water boiler.
I have had to replace seals on the pumps due to grit in the system a number of times. I think the glycerine is burning on the tubes or there is some other type of reaction.
There is also CPVC...
I have used a product for air intake in a boiler room that uses a VFD fan unit. May not be the least expensive option, but look at Exhausto
http://www.exhausto.com/composite-11.htm
You will need two separate loops, one for the domestic hot water and one for the heating. I have used a mixing valve on the heating loop to control the temperature of the heating water as the boiler water must always be the same hot temperature to create the domestic hot water.
This type of heater is more expensive than a standard one, however I have even sold one to a laudramat! We have them installed in public housing as well.
Because of the counter flow of condensing boiler it is the INLET water temperature that determines the efficiency. It can do practically any temperature gain as long as you are within the BTU and flow ratings of the boiler.
So, for domestic HW applications, the condensing boilers get pretty...
For domestic hot water many new installations are moving away from large storage. The reason is two fold, the energy savings considering keeping large volumes of water hot during off hours, and the safety aspect of growths in the water such as Legoinella.
Why not look into the new condensing...
Keep the pipe 2" and slope back to the reciever. This way you will get just flash steam out of the vent (unless you have failed traps), and the liquid will drip back to the pump. Be sure the vent does not point to any area where the steam flow may harm people.
There is a boiler room with three new forced draft oil burning boilers (2 ea. 300 HP and 1 ea. 100 HP). I was asked to provide the air intake fan. These boilers will be sequenced according to laod. Any experience with modulating vs. single speed fans and sizing of the air intake system will...
Spence also manufacturers a valve for this application. Either pilot operated for large pipe diameters or direct acting for smaller ones. We use it on cold water to reduce the temperature of condensate before discharging into the sewer (reverse acting).
Look At: www.spenceengineering.com
I am no expert on clean rooms, but you can 'clean' plant steam with a separator and filter (down to 1-micron). Much less expensive than a clean steam generator. Look at:
http://www.spenceengineering.com/Handbook/scrub.pdf
Since you will be cutting down the flow in the heat exchanger, you will also be reducing the steam load. Therefor there is a chance that the steam control valve will be oversized and not be able to control the temperature well. If this is the case you may have to change to a 1/3 - 2/3 split...
