Cast Iron
Armstrong 6155 (6000 Series) forged chrome-moly steel inverted bucket steam traps are designed for vertical installation with a choice of socketweld or flanged connections. A unique leverage system multiplies the force provided by the bucket to open the valve against system pressure. The mechanism is free-floating and has no fixed pivots to create wear or friction.
Because the mechanism is located at the top of the trap, no dirt can collect on the orifice. Small particles of dirt are held in suspension until discharged by the full differential purging action when the bucket sinks, pulling the valve off the seat. The discharge orifice is surrounded by a water seal, preventing live steam loss. Automatic air venting is provided by a small vent hole in the bucket, which provides continuous automatic air and CO2 venting at steam temperature.
Inverted bucket traps drain continuously, although discharging intermittently, to prevent condensate backup. They are also resistant to water hammer.
Operation on Superheat
A normally operating bucket trap is filled with saturated steam and condensate. Superheated steam can enter only as fast as the steam inside can condense. As a result, the temperature of the trap is at (or slightly below) saturated steam temperature, regardless of the degree of superheat.
For Superheat Service
- Don’t oversize the orifice; a restricted orifice may be advisable.
- Specify a burnished valve and seat and an extended inlet tube and check valve.
- Provide a drip leg of adequate diameter and length.
- Provide a generous length (2'-3' or 600-900 mm) of inlet piping, with the trap below the main.
- Don’t insulate the trap or the inlet piping.
Materials
| Component | Material |
|---|---|
| Body | ASTM A182 F22 Class 3 Forged Chrome-Moly Steel |
| Internals | All stainless steel—304 |
| Valve and seat | Titanium |
Options
Internal Check Valves: Spring-loaded stainless steel check valves screw into an extended inlet tube having a pipe coupling at the top to save fittings, labor, and money. Internal check valves may result in slightly reduced capacities. Add suffix "CV" to the trap number for an internal check valve.
Dimensions and Weights
| Dimension | 6155G (Screwed or SW) | 6155G-FW (Flanged) |
|---|---|---|
| Pipe Connections | 1", 1-1/4" (25, 32 mm) | 1", 1-1/4" (25, 32 mm) |
| "A" (Flange Diameter) | - | 11-3/4" (298 mm) |
| "B" (Height, Screwed or SW) | 24-1/8" (613 mm) | - |
| "BB" (Face-to-Face) | - | 29-11/16" (724 mm)* |
| "G" (Body OD) | 8-3/8" (213 mm) | 8-3/8" (213 mm) |
| "K" (Center Outlet to Center Inlet) | 1-3/4" (44.4 mm) | 1-3/4" (44.4 mm) |
| Number of Bolts | 10 | 10 |
| Weight | 325 lb (147.4 kg) | 340 lb (154.2 kg) |
*"BB" dimensions shown are for Class 2500 flanged No. 6155G-FW traps. Consult factory for dimensions of models with other connection sizes and/or flanges.
Pressure-Temperature Rating
| Model No. | Max. Oper. Pressure, Sat. Steam | Max. Allowable Pressure (Vessel Design) at -28/+343°C (-20/+650°F) | Max. Allowable Pressure at 454°C (850°F) | Max. Allowable Pressure at 538°C (1000°F) |
|---|---|---|---|---|
| 6155G | 186 barg (2700 psig) | 241 barg (3500 psig) | 241 barg (3500 psig) | 114 barg (1650 psig) |
Note
Maximum operating pressure to be marked on nameplate will be determined by actual orifice used. Traps with flanges may have different pressure-temperature ratings. Maximum back pressure is 99% of inlet pressure.
Capacity
Installation and CE Marking
The 6000 Series is designed for vertical installation. All models are CE Marked according to the PED (2014/68/UE). For the 6155-G model, the CE marking parameters are:
- PMA (Maximum Allowable Pressure): 241 bar
- TMA (Maximum Allowable Temperature): 343 °C
- Volume: 6.66 l
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