Armstrong CD-40 and CD-60 Series controlled disc steam traps contain a replaceable capsule, making it possible to renew a worn trap by simply replacing the capsule. A heating chamber in the shell ensures consistent operation. This steam jacket provides a relatively constant temperature in the control chamber regardless of ambient conditions. Cycling rate is controlled and does not increase when the trap is exposed to cold winds, rain or snow.

CD-40 Series traps are also available with optional integral .045 perforated stainless steel strainer screens. CD-60 Series traps contain integral strainers with ratios of open area to inside area of pipe that equal or exceed those of most separate “Y” type strainers.

Maximum Operating Conditions

Maximum allowable pressure (vessel design):

• Model CD-40: 600 psig @ 500°F (41 barg @ 260°C)
• Model CD-60: 600 psig @ 750°F (41 barg @ 399°C)

Maximum operating pressure: 600 psig (41 barg) at saturated steam temperature Minimum operating pressure: 10 psig (0.7 barg)

Connections and Options

• Model CD-40: Screwed NPT and BSPT
• Model CD-60: Screwed NPT and BSPT, Socketweld
• Option: CD-40 Series integral strainer screen (.045 perforated stainless steel)

Materials

Component	Model CD-40	Model CD-60
Body	Carbon steel—C-1215	ASTM A216 WCB
Cap	—	ASTM A216 WCB
Control chamber	Hardened stainless steel	Hardened stainless steel
Disc	Hardened stainless steel	Hardened stainless steel
Capsule body	Hardened stainless steel	Hardened stainless steel
Strainer screen	Stainless steel (option)	20 x 20 mesh stainless steel

Dimensions and Weights

Model No.	Pipe Connections	"A" (Diameter)	"B" (Height)	"C" (Length)	"D" (C to Top of Cap)	Weight
CD-41*	3/8", 1/2" (10, 15 mm)	1-1/4" (31.7 mm)	—	3" (76.2 mm), 3-13/32" (86.5 mm)	—	3/4 lb (0.3 kg)
CD-42*	3/4" (20 mm)	1-5/8" (41.3 mm)	—	3-15/16" (100.0 mm)	—	1-3/4 lb (0.8 kg)
CD-43*	1" (25 mm)	2-3/8" (60.3 mm)	—	4-5/8" (117.5 mm)	—	4-1/4 lb (1.9 kg)
CD-61	3/8", 1/2" (10, 15 mm)	—	2-3/4" (66.7 mm)	3-1/2" (88.9 mm)	2-1/8" (50.8 mm)	2-3/4 lb (1.2 kg), 2-1/2 lb (1.1 kg)
CD-62	3/4" (20 mm)	—	3-1/2" (87.3 mm)	4-5/8" (117 mm)	2-3/4" (68.3 mm)	4-3/4 lb (2.2 kg)
CD-63	1" (25 mm)	—	4-1/4" (108 mm)	4-3/4" (122 mm)	3-5/16" (84.1 mm)	6-3/4 lb (3.1 kg)

*Optional integral strainer available.

Capacity

Capacities given are continuous discharge capacities in pounds and kilograms of hot condensate per hour at pressure differential indicated with condensate temperatures approximately 25°F (14°C) below steam temperatures.

Operating Note

CD traps can operate with a minimum of 2 psig (0.15 barg) inlet pressure and a maximum of 80% back pressure. However, for best results, inlet pressure should not drop below 10 psig (0.70 barg) and back pressure should not exceed 50% of inlet pressure.