Table of Contents
What determines the capacity of a steam trap?
The maximum steam pressure is determined by either the design specification of the system or by the pressure setting of the safety valve which protects the steam system. Operating steam pressure can be obtained from an installed pressure gauge.
How do I choose a steam trap?
Application type, system design and maintenance needs will influence the performance and selection of steam traps. Factors such as waterhammer, dirt, steam locking, group trapping, vacuum conditions and temperature control of processes are discussed in this tutorial.
How do you size a Venturi steam trap?
To determine the correct orifice size for the Venturi steam trap, the following information should be obtained:
- Maximum steam pressure (to define steam trap body rating)
- Maximum steam temperature (to define steam trap body rating) – Operating pressure (barg)
- Steam pressure before steam trap inlet (barg)
How do you calculate condensate load for a steam trap?
Calculate average rate of condensate: Pounds of condensate x 60 = Lbs./Hr. 13.6 x 60 = 54.4 Lbs./Hr. This is the average rate of condensate the trap must handle during heat-up. A capacity of 54.4 Lbs./Hr.
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 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.
How is steam load calculated?
The feedwater flow rate can be calculated from steam mass flow and blowdown rate:
- Blowdown Mass Flow = Feedwater Mass Flow * Blowdown Rate.
- Steam Mass Flow = Feedwater Mass Flow – Blowdown Mass Flow.
- Steam Mass Flow = Feedwater Mass Flow – Feedwater Mass Flow * Blowdown Rate.
How do you calculate steam condensate flow rate?
Calculate the total condensed liquid flow based on the heat load from the process reactor. This is determined by dividing the total heat removed by the system by the latent heat contained in the steam. The calculation is 30,000 / 794, which is 37.8 lb/hr of liquid condensate.
What is the ideal trap for steam mains?
The trap line should be at least 25 to 30 mm from the bottom of the pocket for steam mains up to 100 mm, and at least 50 mm for larger mains. This allows a space below for any dirt and scale to settle….Drain points.
| Mains diameter – D | Pocket diameter – d1 | Pocket depth – d2 |
|---|---|---|
| 250 mm and above | d1 > D / 2 | Minimum d2 = D |
Can steam traps be installed vertically?
When draining condensate from an elevated steam main using a drip leg, if space is of concern, it is possible to install the trap directly on the vertical section of the trap inlet piping to save space.
What is the sizing factor of a steam trap?
Sizing factor is 3 x capacity or the steam trap will have to pass 360 lbs per hour 6. Differential pressure (P1 – P2 = DP) or 123 psig 7. Steam trap with a orifice rated for 150 psig with a capacity of 360 per hour at a differential pressure of 123 psig Sizing example: Steam to a modulating process requires the following information: 1.
How much weight can a steam trap handle?
The sizing factor is two to one, so we calculate out a 1000 pounds per hour, take that times two, our steam trap must be able to handle 2000 pounds per hour at our Delta P. Calculating the minimum differential pressure across the steam trap, we already looked at that back here on our application.
How do I choose the right steam trap?
A proper steam trap. Important facts to remember: Obtaining efficient and reliable steam trap operation. The correct operational design must be selected, sized properly and installed perfectly. Incorrect steam trap sizing will either cause condensate backup or steam loss. Improper sizing is one of the top three causes of premature failures.
What size condensate pipe do I need for a steam trap?
However, trap size should closely match the size of the piping on the outlet side of the equipment that supplies condensate to the trap. It is generally recommended to size condensate piping on the discharge side of equipment that supplies condensate to the steam trap according to the following table: