How does a steam trap valve work?
How does a steam trap valve work?
In inverted bucket steam traps, the bucket within the trap is attached to a lever that opens and closes the trap valve in response to the bucket’s motion. When steam or air flows into the underside of the inverted bucket and condensate surrounds it on the outside, the steam causes the bucket to become buoyant and rise.
Do you need a check valve after a steam trap?
Steam traps – Other than with steam traps discharging to atmosphere, check valves should always be inserted after a steam trap to prevent back flow of condensate flooding the steam space. The check valve will also prevent the steam trap from becoming damaged by any hydraulic shock in the condensate line.
What type of valve is steam trap?
Steam traps are a type of automatic valve that filters out condensate (i.e. condensed steam) and non-condensable gases such as air without letting steam escape. In industry, steam is used regularly for heating or as a driving force for mechanical power.
What is differential pressure in steam trap?
Differential pressure is the difference between steam trap inlet pressure and outlet pressure. For example; if the inlet pressure is 8 bar and the steam trap discharges to the atmosphere, differential pressure is 8-8=0 bar. After steam trap, each meter of elevation of the pipeline equals 0,11 barg back pressure.
What are 3 types of steam traps?
Steam traps can be divided into three different types based on their operating principles:
- Mechanical Steam Traps.
- Thermodynamic Steam Traps.
- Thermostatic Steam Traps.
- Applications Suited to the Free Float® Type.
- Applications Suited to the Disc-Type.
- Applications Suited to the Thermostatic Type.
Where should a check valve be installed?
Check valve can be installed in horizontal or vertical piping runs, with the flow running upward. Mounting for vertical installations is critical.
Is a steam trap a valve?
The American National Standards Institute defines a steam trap as a “self-contained valve that automatically drains the condensate from a steam-containing enclosure while remaining tight to live steam, or if necessary, allowing steam to flow at a controlled or adjusted rate.
Does a steam trap reduce pressure?
Steam traps are used anywhere there is a steam-powered system to discharge condensate, that is, the liquid that builds up in the pipelines, along with other non-condensable gases, to relieve the pressure in the lines and regulate the flow of steam within in it.
What is steam trap back pressure?
The ‘back pressure’ is the pressure just downstream of the steam trap. In other words, back pressure is the outlet or secondary pressure of the trap. The difference between a trap’s inlet (primary) pressure and back pressure is called the ‘differential pressure’.
How many types of trap valves are there?
There are two varieties of thermodynamic steam trap: the thermodynamic disc and piston types. Thermodynamic steam traps operate by utilizing the difference in kinetic energy between high velocity steam (a gas) and slower moving condensate (a liquid).
What happens when a steam trap fails open?
When a steam trap fails open, it simply acts like an open valve and hence, a lot of steam would leak through it. As a result, the overall steam consumption of the plant will go up, reducing the efficiency of the operation.
How often should steam traps be replaced?
every three to four years
On average, steam traps are replaced every three to four years.
Should check valves be installed vertically or horizontally?
When installing a check valve, a horizontal line is always preferred, because it takes gravity out of the equation.
What is the difference between check valve and non return valve?
A non-return valve lets the fluid flow in one direction. When fluid in the line reverses direction, a check valve prevents backflow by allowing flow in one direction. The check valves are usually designed for a particular pressure.
Do check valves reduce water pressure?
Check valves do not reduce pressure, they actually help maintain it. In the setup you describe, it might work. However you will DEFINITELY need another check valve on the outlet of the tank to prevent the high pressure flow from backwashing in through the bottom, since there is no shuttoff/float valve there.
Why steam trap is used in piping?
Steam traps are an important part of a steam and condensate piping network to stop Latent heat loss, reduce the cost of heating, Increase efficiency, water hammering, and separation of any non-condensable gases like CO2. Knowing the functionality of the steam trap is important as a process engineer or piping engineer.
How do you control steam pressure?
Most steam boilers have three main controls that maintain the correct steam pressure inside the boiler and cause the boiler to shut down if an unsafe pressure is reached. These three main controls are the operator, modulation, and high limit pressure controls.