The Armstrong CD-4080 is a durable disc-style steam trap designed for high-pressure use. Engineered to meet the demanding conditions found in power plant, refinery, and chemical plant applications, the CD-4080 is piped in-line by a 360° four-bolt connector block (such as the Armstrong model IS-4). This allows the trap to be installed in virtually any piping configuration with the added flexibility of easier field replacement. For best performance, the CD-4080 should be mounted horizontally.

The CD-4080 disc steam trap combines savings in three important areas: energy, installation, and replacement. It features a compact design, exceptional corrosion resistance, freeze resistance, and a replaceable seat and disc. Mounting the CD-4080 on an IS-4 4-bolt connector provides quick and easy in-line replacement.

Maximum Operating Conditions

• Maximum allowable pressure (vessel design): 1245 psig @ 900°F (85.9 barg @ 482°C)
• Maximum operating pressure: 1245 psig (85.9 barg)
• Minimum operating pressure: 150 psig (10.3 barg)

Materials of Construction

• Body: ASTM A351 Gr. CF8M
• Cap: ASTM A351 Gr. CF8M
• Seat: ASTM A681 Type D2
• Disc: ASTM A681 Type D2

360° Universal Connector Options & Dimensions

The trap utilizes a 360° universal connector block with the following options:

• Blowdown valve
• Connection sizes: ¾” or 1” NPS
• Connection types: SW, NPT or Flange

Model No.	CD4080 (in)	CD4080 (mm)
Pipe Connections	3/4, 1	20, 25
“A” (Height)	3.86	98.00
“B” (Length)	4.30	109.10
“C” (Flange to Top)	2.43	61.80
Trap Only Weight lb (kg)	5.2	(2.3)

Product Installation

WARNING

When working with high pressure/temperature steam, please review General Safety Guidelines. Before installation, verify that the maximum allowable pressure/temperature and maximum operating pressure of the trap are sufficient to handle the system design pressure and temperature.

BURN HAZARD

Due to the high temperatures of steam, the trap surface will be hot. For personnel safety, ensure proper precaution is taken while working near the steam trap. Contact with steam, hot water, or hot metal surfaces can cause severe skin burns.

1. Before installing the trap, ensure the steam line is clean. Blow down the 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.
3. The trap must be installed on a 4-bolt connector block (IS-4). Armstrong recommends installing the trap in a horizontal branch of the steam line.
4. Proper piping and drip legs of adequate size and diameter are essential for the successful operation of the Armstrong traps.
5. Isolation valves are needed before and after traps. When putting a new trap into service in a hot steam system, be sure to open the isolation valve on the steam line slowly.

Proper Piping and Drip Leg Size

Note: Drip leg pipe size (D) is the same as the header diameter up to 4" NPS. Above 4’’, use 1/2 the header size, but never less than 4’’.

Steam Main Size (in) NPS	Drip Leg Diameter (in) NPS	Supervised Warm-Up Min Length (in)	Automatic Warm-Up Min Length (in)
1/2	1/2	10	28
3/4	3/4	10	28
1	1	10	28
2	2	10	28
3	3	10	28
4	4	10	28
6	4	10	28
8	4	12	28
10	6	15	28
12	6	18	28
14	8	21	28
16	8	24	28
18	10	27	28
20	10	30	30
24	12	36	36

Installing Connector Blocks

The IS-4 connector block should be installed in piping with the flow direction stamp pointing in the direction of steam flow as indicated on the connector block. The trap will then be bolted to the connector block after the connector block has been installed.

When installing the trap to the connector block, apply 35-50 lbf-ft (47 to 68 N-m) of torque to the bolts using a 3/8” wrench. Allow 3” (80 mm) clearance for bolt installation and removal.

Maintenance Requirements

In order to ensure continuous optimum performance from any steam trap, it should be inspected according to the following schedule:

Operating Pressure (psig)	Drip	Tracer	Coil	Process	Critical Drip, Tracer, Coil or Process
0-100	1	1	2	3	4 or Continuous Real Time Monitoring
101-250	2	3	2	3	4 or Continuous Real Time Monitoring
251-450	2	3	3	4	4 or Continuous Real Time Monitoring
451 and above	3	4	4	4	4 or Continuous Real Time Monitoring

Note: Wear progresses simultaneously on both the disc and the seating surfaces. Simply replacing the disc is not sufficient to repair a disc trap. Replace the disc, seat and gaskets with a CD-4080 Series Repair Kit if the disc/seat are not sealing due to wear.

Replacing a Failed Steam Trap on a Connector Block

NOTE

It is not necessary to remove the connector block from the piping to install the replacement trap.

1. Shut off the steam supply and condensate return valve for the steam trap.
2. Ensure that the trap is cold (less than 100°F/40°C), then drain the body of any remaining condensate.
3. Remove the bolts from the connector block. Use a scraper to remove all traces of the old gasket from the flange surface.
4. Inspect the connector block for damage or erosion. If present, remove or wash off any dirt or debris trapped on the connector block filter screen.
5. Install the new gasket between the connector block and the trap body.
6. Install the new trap on the connector block. Coat all new bolt threads with an anti-seize compound.
7. Gradually tighten bolts evenly, in a crisscross fashion, using a torque wrench to a maximum torque of 35 to 50 lbf-ft (47 to 68 N-m).
8. Slowly open the steam valve to the trap, wait ~1 minute, then slowly open the condensate return valve.