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For Steam Service up to 600 psig (42 bar)...Capacities to 2,500 lb/hr (1,134 kg/hr)

The Armstrong CD-33 is a disc style trap designed to control the trap's cycle rate. By reducing the cycle rate, the Armstrong CD-33 will have a longer service life than typical disc traps. This enhanced performance will ensure that maintenance time is minimized and steam costs are greatly reduced.

The CD-33 is designed with three discharge ports, which offer stable disc operation to extend trap operating life. The capacities of the Armstrong CD-33 have been engineered specifically for the following applications: large steam main drips, process equipment, and HVAC heating equipment on constant pressure. The CD-33L (low capacity 1/2" and 3/4" only) trap is designed for the low capacity applications of steam main drips and steam tracing lines. By ensuring that the capacities are designed to suit the application, and are not oversized, the CD-33 Series will last longer than other disc traps with excessive capacity ratings.

Advantages
  • Three discharge port design
  • Minimum wear with controlled cycling
  • Freeze-resistant
  • Hardened seat and disc
Specification
Steam trap shall be stainless steel thermodynamic type, integral seat design with hardened disc and seating surfaces, and electroless nickel plated finish. When required, trap shall be supplied with an integral Y strainer, integral blowdown valve or rain guard insulating cap. Maximum allowable pressure (vessel design) shall be 915 psig @ 752ºF (63 bar @ 400ºC). Maximum operating pressure shall be 600 psig @ 752ºF (41 bar @ 400ºC).
Unit of Measure
Items Image
CD-33
CD-33 Series Disc Trap
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CD-33S
CD-33 Series Disc Trap
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CD-33L
CD-33 Series Disc Trap
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CD-33SL
CD-33 Series Disc Trap
Description N/A For Steam Service up to 600 psig (42 bar)...Capacities to 2,500 lb/hr (1,134 kg/hr)

The Armstrong CD-33 is a disc style trap designed to control the trap's cycle rate. By reducing the cycle rate, the Armstrong CD-33 will have a longer service life than typical disc traps. This enhanced performance will ensure that maintenance time is minimized and steam costs are greatly reduced.

The CD-33 is designed with three discharge ports, which offer stable disc operation to extend trap operating life. The capacities of the Armstrong CD-33 have been engineered specifically for the following applications: large steam main drips, process equipment, and HVAC heating equipment on constant pressure. The CD-33L (low capacity 1/2" and 3/4" only) trap is designed for the low capacity applications of steam main drips and steam tracing lines. By ensuring that the capacities are designed to suit the application, and are not oversized, the CD-33 Series will last longer than other disc traps with excessive capacity ratings.

Advantages
  • Three discharge port design
  • Minimum wear with controlled cycling
  • Freeze-resistant
  • Hardened seat and disc
Specification
Steam trap shall be stainless steel thermodynamic type, integral seat design with hardened disc and seating surfaces, and electroless nickel plated finish. When required, trap shall be supplied with an integral Y strainer, integral blowdown valve or rain guard insulating cap. Maximum allowable pressure (vessel design) shall be 915 psig @ 752ºF (63 bar @ 400ºC). Maximum operating pressure shall be 600 psig @ 752ºF (41 bar @ 400ºC).
N/A w/strainer N/A low capacity N/A w/strainer
low capacity
Body N/A ASTM A743 Gr. CA40
Cap N/A ASTM A743 Gr. CA40
Disc Material N/A ASTM A276 Gr. 420
Strainer Screen N/A 30 x 30 Mesh T-304 Stainless Steel
Screen Retainer N/A ASTM A743 Gr. CA40
Blowdown Plug N/A N/A Carbon Steel N/A N/A
Pipe Connections N/A 1 in1/2 in3/4 in15 mm20 mm25 mm N/A 1 in1/2 in3/4 in15 mm20 mm25 mm N/A 1/2 in3/4 in3/8 in10 mm15 mm20 mm N/A 1/2 in3/4 in15 mm20 mm
Dimension - A N/A 1 7/16 in1 3/4 in37 mm44 mm N/A 1 7/16 in1 3/4 in37 mm44 mm N/A 1 7/16 in36 mm N/A 1 7/16 in36 mm
Height - B N/A 2 1/2 in3 1/8 in63 mm79 mm N/A 4 1/4 in4 3/4 in108 mm121 mm N/A 2 1/2 in63 mm N/A 4 1/4 in108 mm
Length - C N/A 3 5/16 in3 15/16 in84 mm100 mm N/A 3 1/2 in4 1/8 in89 mm105 mm N/A 3 5/16 in84 mm N/A 3 1/2 in89 mm
Top of Cap - D N/A 1 3/4 in2 1/4 in44 mm57 mm N/A 1 3/4 in2 1/4 in44 mm57 mm N/A 1 3/4 in44 mm N/A 1 3/4 in44 mm
Withdrawal Distance Rain Guard Insulating Cap - E N/A N/A 3 in76 mm N/A N/A 3 in76 mm
Blowdown Connection Size - F N/A N/A 1/4 NPT in6 mm N/A N/A 1/4 NPT in6 mm
Withdrawal Distance Blowdown Valve - G N/A N/A 3 1/2 in89 mm N/A N/A 3 1/2 in89 mm
Weight N/A 1.4 lb2.5 lb0.64 kg1.1 kg N/A 2.2 lb3.25 lb1.0 kg1.5 kg N/A 1.41 lb0.64 kg N/A 2.2 lb1.0 kg
Maximum Allowable Pressure at 752ºF (Vessel Design) N/A 915 psig
Maximum Allowable Pressure at 400ºC (Vessel Design) N/A 63 bar
Minimum Operating Pressure N/A 3.5 psig0.24 bar
Maximum Operating Pressure at 486ºF N/A 600 psig
Maximum Operating Pressure at 252ºC N/A 41 bar
Maximum Back Pressure of Inlet Pressure N/A 80 %
Options N/A Blowdown Valve (Stainless Steel) Rain Guard Insulating Cap (1/2'', 3/4'' Sizes Only) (Stainless Steel)
Note N/A Designs, materials, weights and performance ratings are approximate and subject to change without notice.