Steam Pressure Gauges – Pigtails
We are looking for specific design information for the length and material selection for steam pressure gauge pigtails to release the heat from the steam.
Archive for April 2009
Waterhammer in Steam Systems
There is only one time to correct water hammer – IMMEDIATELY Water Hammer Is Never Normal; It Is Abnormal
Water hammer is not only a system issue; it is primarily a safety issue. Understanding the nature and severity of water hammer in a steam and condensate system, will allow facilities to avoid its destructive forces. A greater understanding should also help with the introduction of preventative measures into system designs, steam system startups, maintenance and installations. This will additionally help provide maximum safety for personnel, reduce maintenance cost, and reduced system downtime.
Water hammer; in its most severe form, can injure or even cause fatalities to plant personnel. Unfortunately, steam systems are experiencing some type of water hammer. Many mistakenly believe that water hammer is unavoidable, and a natural part of steam and condensate systems. This is entirely false. If the system is properly designed and correctly operated, water hammer in any form will not occur. It is possible to have high pressure steam systems operating without water hammer and a long operational life from the steam components.
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Deaerator Venting
In a steam deaerator, steam serves as the scrubbing agent to reduce the partial pressures of the gases being removed. The phenomenon of gas removal from water through the use of scrubbing in a deaerator can be accomplished in several different ways.
With the scrubbing action occurring, the deaerator must vent the non-condensable gases into atmosphere. Therefore, the only acceptable steam venting from a steam system operation is the Deaerator venting of non-condensable gases with a very small percentage of steam. To accomplish this goal of venting non-condensable gases; the deaerator will vent a small percentage of steam.
Read more about deaerator venting…
Steam Trap Installation
A steam trap has two major functions, to remove condensate as quickly as it is formed, and to prevent steam discharge. There are certain installation faults which negatively impact the ability for traps to effectively perform these functions efficiently.
A high percentage of steam trap failures are simply due to incorrect installation.
Proper installation should provide six years of maintenance free operation. The “Best Practices” for steam trap installations are outlined below:
The most important rule to remember for steam trap installation is GRAVITY. Condensate must flow from the process to the steam trap by the forces of gravity.
Read more about Steam Trap Installation…
Steam Quality
Steam quality is the proportion of saturated steam (vapor) in a saturated condensate (liquid)/steam (vapor) mixture. A steam quality of 0 indicates 100% liquid (condensate) while a steam quality of 100 indicates 100% steam or 1 lb of steam with 95% steam and 5% percent of liquid entrainment has a dryness fraction of .95.
The measurements that need to obtain a steam quality measurement are temperature, pressure and entrained liquid content. A high percentage (88% or more) of the industrial steam systems use saturated steam for the process applications.
Saturated steam (steam that is saturated with energy) had enough energy added to saturated liquid to achieve the vapor phase.
Read more about steam quality — click on the below link.
http://www.plantsupport.com/download/pse_nl.pdf
