Forbes Marshall SOFT31 - Brief Product Information; Description; Sizes and Pipe Connection; Available Types

3. Brief Product Information:
3.1 Description:
The Forbes Marshall Single Orifice Float Trap, SOFT31, is a cast iron single orifice float trap
available with an integral automatic air venting facility. It is available with horizontal or vertical
connections with flow downwards. As an alternative a manual needle valve can be added and
used as a steam lock release.
3.2 Sizes and Pipe Connection:
DN 15, 20 and 25 Screwed BSPT/NPT/BSP.
Flange connection: #125, PN16
Note: Available with IBR certificate on request.
3.3 Available Types:
SOFT31-T TV with Thermostatic air Vent (TV)
SOFT31-S with Steam Lock Release (SLR)
SOFT31-ST combined TV and SLR
3.4 Limiting Conditions :
3
SOFT31(DN15-25)
Screwed Version # 125 Flange PN16 Flange
PMA Maximum 13 bar g at 10.1 bar g at 13 bar g at
Allowable pressure 220°C 180°C 180°C
TMA Maximum 220°C at 180°C at 180 at
Allowable temperature 13 bar g 10.1 bar g 13 bar g
PMO Maximum 13 bar g 10.2 bar g 13 bar g
Operating pressure
TMO Maximum 220°C at 180°C at 180°C at
Operating temperature 13 bar g 10.1 bar g 13 bar g
Minimum Operating 0°C 0°C 0°C
Temperature
PMX Maximum differential pressure
SOFT31-4.5 4.5 bar g
SOFT31-10
SOFT31-13
10 bar g
13 bar g
Cold hydraulic test pressure 26 bar g