IB-150 Installation and Maintenance Thermostatic Wafer Steam Traps Models WT-1, WMT-1, WT-2000, & WT-3 This bulletin should be used by experiencedpersonnel as a guide to the installation of the Model WT-1, WMT-I, WT-2000, and WT-3 Steam Traps. Selection or installation of equipment should always be accompanied by competent technical assistance. You are encouraged to contact Armstrong International, Inc. or its local sales representative for additional information. 3) For proper operation, the trap body must be installed with respect to the flow direction designations on the trap body. Wafer traps may be installed on either vertical or horizontal piping. 4) On tracer applications, be sure to use only one trap for each tracer line, and be sure that the tracer pitches down to the trap. APPLICATION NOTES The WMT- 1 is designed for instrument tracing applications. The WT-I and WT-2000 are meant to be used for low capacity tracing. The WT-3 trap is designed as a drip trap for superheated steam lines. NOTE: Since the normal operation of &suppressedtemperature-discharge (subcooling) steam traps is to back up condensate, they should not be used on drip legs for saturated steam service, or for draining heating or process equipment. INSTALLATION Steam trap installation is critical from both a performance and maintenance aspect. Installation ofthe trap is simplified if you follow these guidelines: 1) Before installing the trap, clean out the line by blowing down at full steam pressure. Blowdown any strainers ahead of the trap. 2) Install the trap so that it is ACCESSIBLE for inspection and repair, BELOW the drip point, and CLOSE to the vertical drip leg. 5) Use pipe dope sparingly on male threads only. Leave the end thread exposed to avoid introducing the sealant into the system. 9) In tracing applications, it is best to insulate the trap as well as the product and tracer line. 10)In superheat drip applications (Model WT-3 Only), what little condensate there is usually forms in drip legs to the traps and in the traps themselves, rather than in the main or branch piping. Therefore, providing drip legs of adequate length and diameter is essential to the successful operation of the Armstrong wafer trap. See Chart 2-1 and Figures l-l & 2-l. 6) Install strainers ahead of traps if specified or when dirt conditions warrant their use. The WT-1 and WT-3 traps have internal strainers. 7) Shut-off valves ahead of traps are needed when traps drain steam mains or where the system cannot be shut down for trap maintenance. When valving a new trap into a hot system, be sure to open the valve slowly. 8) Servicing is simplified by keeping lengths of inlet and outlet nipples identical for traps of a given size and type. A spare trap with identical fittings and half unions can be kept in storeroom. In the event a trap needs repair, it is a simple matter to break the two unions, remove the trap, put in the spare and tighten the unions. If you do use unions, the best practice is to install at least one of them at right angles to the trap. If you only use one union, connect it to the discharge side of the trap. Fig. 1-l. Drip Leg Sizing The properly sized drip leg will capture condensate. Too small a drip leg can actually cause a venturi ‘piccolo’effectwhere pressure drop pulls condensate out of the drip leg and trap. Thermostatic Wafer Steam Traps Models WT-1, WMT-1, WT-2000, & WT-3 INSTALLATION RECOMMENDATIONS Fig. 2-1. Trap Draining Drip Leg on Superheated Steam Main 3 M D Steam Main Size (in) % VI 1 2 3 4 Drip Leg Diameter (in) % % 1 2 3 4 Drip leg Length Minimum Supervised Automatic Warm-Up Warm-Up (in) (in) 10 28 10 28 10 28 10 28 10 28 10 28 BASIC MAINTENANCE NOTE: Exercise care in the maintenance of any thermostatic wafer trap because the small discharge area is susceptible to clogging. MAINTENANCE SCHEDULE High pressure drip traps should be tested at least three times per year. Tracer traps should be tested yearly on applications up to 100 psi, twice yearly for pressures from 101-450 psi, and three times per year for pressures above 450 psi. CHECK TRAP When the steam trap is suspected of malfunctioning, it can be checked by observing the discharge ofthe trap. The discharge of a wafer trap is either intermittent or modulating, depending on the load CHECK APPLICATION If the trap can not be made to operate normally, verify that the trap is correct for the application (capacity, differential pressure, etc.). If correct, install a new steam trap ofthe same series and of equal capacity in its place. Ifthe trap is blowing live steam, remove the trap from the line, back flush it with compressed air or water, re-install it and check it again for normal operation. NOTE: Whenperformingmaintenance on any steam trap, the common practice is to remove the trap in question and immediately install a good trap in its place. Maintenance can then be performed with minimum equipment downtime. For additional information on Thermostatic Wafer Steam Traps, contact your Armstrong Representative and request Catalog 108. Ill? &$A AZLJ IB-150 3.5M 4/94 Armstrong International, Inc. 8 816 Maple Street, P.O. Box 408, Three Rivers, Michigan 49093 - USA Phone: (616) 273-1415 Part lndustriel Des Hauts, B-4040 HerstaVLiege, Belgium Phone: (041) 480152 Steam Traps\Humidifiers\Steam Coils\Valves Printed In U.S.A.
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