20929 Bridge Street, Southfield, MI 48033
20929 Bridge Street, Southfield, MI 48033 4121 Brockton Drive SE, Grand Rapids, MI 49512 6200 Baron Drive, Bridgeport, MI 48722 6910 Treeline Drive, Suite A, Brecksville, OH 44141 Serving the industry since 1927 Phone: (800) 589-6120 - Fax: (248) 354-3710 www.deppmann.com March 16th 2009 Trap Selection and Sizing, Part 1 Sometimes it appears that trap selection and sizing is more of an art than a science. Appearances aside, there is a great deal of science behind the selection, sizing, and piping of steam traps. Over the next several weeks we will examine the science of steam trap sizing. Today we will look at the selection of the type of trap for our example system of a hydronic heat exchanger with a modulating control valve. The ITT Hoffman steam trap engineering manual, (HS-203C), lists the advantages and disadvantages of various types of traps. A Float and Thermostatic trap is used for our heat exchanger example because we have a low pressure system with a modulating control valve. The advantages of this trap in this application are fast venting of air using the thermostatic vent and continuous modulation of the trap. Removing air from the trap is critical to proper operation. If the air is not removed, the condensate cannot enter the trap and we may back up condensate into the heat exchanger causing damage to the tubes. Modulation is important because this application has a wide variety of capacities from design all the way down to a couple percent of design load. An inverted bucket trap may be a lower first cost, however, in this modulating application there are several negatives. An inverted bucket does not modulate, it cycles. On low load, the bucket trap may lose its prime and blow live steam into the condensate piping. The bucket trap has limited air removal capabilities and the bucket trap may require manual priming. Next week’s article will describe how fouling factors in heat exchangers play a part in steam trap sizing. Thank you for using products sold by R. L. Deppmann Company in Michigan and Ohio! Disclaimer: R. L. Deppmann and it’s affiliates can not be held liable for issues caused by use of the information on this page. While the information comes from many years of experience and can be a valuable tool, it may not take into account special circumstances in your system and we therefore can not take responsibility for actions that result from this information. Please feel free to contact us if you do have any questions.
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