Thermodynamic traps are typically a good choice for high pressure steam main condensate removal, including superheat conditions. Not so good for low pressure or high back pressure. They can also be used on steam tracing.
Float traps are the first choice for draining of most heating and process...
The usual convention is to rate boiler efficiency on HHV basis, whether or not it is designed to operate in a condensing mode.
Combustion turbines are frequently rated on LHV basis.
The pressure at the outlet is dependent on the configuration of the stack, etc., on the discharge. A simple stack has a lower pressure drop across it that a heat recovery steam generator. What the manufacturer probably means is that the performance listed is based on 200 mmH20 static pressure at...
Yes drip leg.
The dryer will work most of the time. The drip leg is useful for upset conditions in the dryer and for removing sediment or other contamination.
In a variable flow system, sparing use of three-way valves is a technique used to maintain a minimum of flow throug the pumps at all times. This is not unusual and should work fine if applied correctly. The flow throught the three-way valves in the bypass position should only be enough to...
If the condensate pump is pumping out of a tank that is vented to atmosphere, then some of the steam will be lost to flashing. The amount of flash loss depends on the pressure upstream of the trap. 300 lb/hr is a conservative number.
The rated flow rate for the pump might be two times the steam...
BronYrAur,
200,000 BTU/hr appears correct. Also make sure you are satasying applicable mechanical and fuel gas codes. Example: International Mechanical Code requires 1 CFM per 2400 BTU/HR fuel input for ventilation/combustion air/dilution air.
Two-on-one CTG to HRSG has been done before, and it can work as long as both CTGs are running. If one CTG is down, the "cold" side of the HRSG has reduced circulation and possibly differential expansion. Keep in mind that an HRSG in this size range is going to be a bottom-supported unit, similar...
Codes might allow PVC, but that does not mean PVC is acceptable or in the ownedr's best interest in every situation. Your engineering judgement can be used to require more than the code allows. The boiler manufactuer might say that PVC is acceptable to them, but they won't take responsibility if...
I don't think you have an issue here. The relief valves are there to protect the boiler. They will not open unless the pressure in the boiler reaches the set point of the relief valve. Nothing that effects the sizing of the relief valves is changing.
If the relief valve setting are not changing, then this does not make sense. If the relief valve setting are supposed to be reduced, then the relief valves will need to be changed out and possible added to, as the size of the relief valve increases as the pressure decreases due to the increase...
If I understand it correctly, you are asking about a pump that pumps a fluid, such as water, being driven by a steam turbine.
Yes, the disharge pressure on the fluid side can be greater than the steam pressure at the inlet of the steam turbine.
Spirax-Sarco has a useful tutorial:
http://www.spiraxsarco.com/resources/steam-engineering-tutorials/condensate-recovery/flash-steam.asp
The short answer is:
Figure out how much is coming into the vessel and how much of that is flahsed to steam
Size the diameter of the vessel such that the...
This subject was covered some time ago in this thread:
thread292-44595
However, I think it warrants additional discussion.
ASME BPVC Section 1, PG-61 FEEDWATER SUPPLY, PG61.1 (excerpt): “…each source of feeding shall be capable of supplying water to the boiler at a pressure of 3% higher than...
The differential pressure at the remote sensor will not be the same as the pressure developed at the pump because of the losses between the pump and the remote sensor.
The head required at the pump must overcome the losses in the supply and return piping as well as the losses through the control...
The set point for the differential pressure must not be too high or control valves will not close properly and pump energy is wasted. Too low and some units will not have adequate performance because the control valve can’t accurately control the required flow to maintain the air-side set point...
