CD-40 CD-60 Disc Trap

CD-40 CD-60 Disc Trap
IB-110
Installation and Maintenance
Armstrong CD-40 and CD-60 Series Controlled Disc Steam Traps
This bulletin should be used by experienced personnel as a guide to the installation and
maintenance of CD-40 and CD-60 Series Controlled Disc steam traps. Selection or
installation of equipment should always be accompanied by competent technical assistance.
We encourage you to contact Armstrong or its local representative if further information is
required.
Table 1. Maximum Operating Pressure
Model No. Connection Size Minimum Operating Pressure Maximum Operating Pressure
CD-40 Series
3/8", 1/2", 3/4", 1"
10 psi
600 psi
CD-60 Series
Installation:
Note: Armstrong Series CD-40 and CD-60 steam traps may be installed in any position as
long as proper flow direction is observed and the trap is not inverted. Since Armstrong
Controlled Disc traps do not rely upon radiation losses to operate properly, they can be
completely insulated.
1) Before installing any trap, blow down the piping that leads to the unit's inlet. Use full
line pressure. Be sure that the maximum operating pressure (MOP) of the trap is
adequate for the installation. (The MOP is stamped on the casting or nameplate.)
2) Install the trap inlet below the liquid level of the equipment to be drained. Figure 1
shows the recommended piping method. Use good piping practices. Make inlet
piping as short as possible. Use a minimum number of elbows and other
restrictions in inlet and outlet piping. Install a dirt pocket in the line ahead of the
trap.
Valve
Disc Trap
Dirt Pocket
Test Valve
Strainer
Installation and Maintenance
Armstrong CD-40 and CD-60 Series Controlled Disc Steam Traps
3) To allow maintenance and provide maximum service, install a valve on each side of the trap
and a downstream testing tee. All valves should be of the fullported type to avoid restricting
flow. Install a strainer ahead of the trap if it does not have an integral strainer.
4) Install a union downstream of the trap unless the discharge line is open and short.
5) When a disc trap discharges to a return system, extreme caution should be exercised to
avoid conditions that create excessive back pressure. For best results, the back
pressure in the return lines should not exceed 50% of the inlet pressure. If elevating
condensate is necessary, remember that every two feet of lift creates about one pound of
back pressure.
6) Where freezing might be encountered, install a pressure or temperature actuated safety
drain device on the inlet piping, directly ahead of the trap. If the trap discharges to a closed
return, another safety drain device should be installed in the discharge piping.
Maintenance:
To assist you in the troubleshooting and repair of steam traps, Armstrong makes available the
following reference material:
- Handbook N-101 "Steam Conservation Guidelines for Condensate Drainage"
- Video Tape "Guidelines for Steam Trap Troubleshooting and Testing"
- Video Tape "Guidelines for Steam Trap Repair"
In order to ensure continuous optimum performance from any steam trap, it should be
inspected according to the following schedule:
Table 2. Suggested Yearly Trap Testing Frequency
Operating
Pressure (PSIG)
0 - 100
101 - 250
251 - 450
451 and above
Drip
1
2
2
3
Application
Tracer
Coil
1
2
2
2
2
3
3
4
Process
3
3
4
12
The renewal of both the CD-40 and the CD-60 is accomplished by replacing the capsule. The
method of replacement, however, differs between the two series.
CD-40 Series:
1) Close the inlet and outlet valves, make sure the trap is cold.
2) Remove the trap from the line. You may replace the trap with a spare to minimize down
time, or service it immediately.
3) Open the trap and remove the strainer screen, if there is one.
2
Installation and Maintenance
Armstrong CD-40 and CD-60 Series Controlled Disc Steam Traps
4) Remove the old capsule and clean the metal-to-metal seating surfaces.
5) Clean any dirt or sediment from the trap.
6) Check that the body is free from erosion, especially near the inlet and outlet connections.
7) Install a new capsule. If a strainer screen is included, clean or replace it, as necessary.
8) Reassemble the trap and restore it to service or place it in stock.
CD-60 Series:
1) Close the inlet and outlet valves, make sure the trap is cold.
2) Unscrew the four bolts, and remove the cap from the trap.
3) Lift out the screen and unscrew the capsule.
4) Discard the old gasket and clean both gasket surfaces.
5) Clean any dirt or sediment from the trap body and cap.
6) Check that the body is free from erosion, especially near the inlet and outlet connections.
7) Install a new capsule and a new gasket, then secure the cap to the body using a
cross-tightening pattern as you would when putting on an automobile wheel.
8) Once all the bolts have been securely tightened, open the valves in the supply and
discharge lines. Check the equipment for normal operation.
If further information is required, we encourage you to contact Armstrong or its local representative.
IB-110
4/99
Armstrong International, Inc.
816 Maple Street, P.O. Box 408, Three Rivers, Michigan 49093 - USA Ph: (616) 273-1415 Fax: (616) 278-6555
Parc Industriel Des Hauts-Sarts, B-4040 Herstal/Liege, Belgium Ph: (04)409090 Fax: (04)481361
Steam Traps \ Humidifiers \ Steam Coils \ Valves \ Air Vents \ Pumping Traps \ Water Heaters
Printed in U.S.A.
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www.armstrong-intl.com
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