bultib-150

bultib-150
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.
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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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