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Forbes Marshall SOFT31 - User Manual

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Single Orifice Float Trap With SLR and/or TV
SOFT31 (DN15-25)
Installation and Maintenance Manual
Energy Conservation | Environment | Process Efficiency
www.forbesmarshall.com

Questions and Answers

  • P
    Paul JonesAug 6, 2025
    Why is my Forbes Marshall Industrial Equipment leaking steam?
    • E
      Erika PowellAug 6, 2025
      If your Forbes Marshall Industrial Equipment is leaking steam, ensure the arrow on the nameplate points downwards during installation. Additionally, inspect the valve and seat assembly for any deposits and clean them. For steam leaking from the trap body, tighten the cover nuts and bolts to the recommended torque. Also, check the gasket for damage and replace if necessary.
  • B
    barbara04Aug 16, 2025
    What to do if Forbes Marshall Industrial Equipment is not discharging?
    • M
      Michelle CoxAug 17, 2025
      If your Forbes Marshall Industrial Equipment is not discharging at all and the surface temperature of the trap is low, first verify the installation, checking the flow direction arrow on the cover and the name plate arrow on the base. Next, inspect the strainer for any blockages. Also, if the actual differential pressure exceeds the design pressure, the steam trap may be closed. Check the valve and seat assembly for blockages. Finally, check if the ball float is punctured; if so, replace it and address any water hammering to prevent recurrence.
  • J
    Jay BennettAug 27, 2025
    How to fix Forbes Marshall SOFT31 Industrial Equipment not discharging enough condensate?
    • D
      Devin GonzalesAug 27, 2025
      If your Forbes Marshall Industrial Equipment isn't discharging enough condensate, begin by checking the equipment parameters and trap sizing to ensure it matches the recommended size for the condensate load. Also, check for back pressure and corresponding discharge capacities. Leaking traps may increase back pressure, so replace or repair any faulty traps. If multiple traps discharge into a single condensate return line, make sure each has a non-return valve (NRV) on its outlet. Ensure all bypass valves are closed, as leaking or open bypass valves can also increase back pressure.

Summary

Preface

Important Safety Notes

Intended Use

Check product suitability for intended use/application per instructions and technical sheets.

Accessibility and Lighting

Ensure safe accessibility and working conditions prior to working on the product.

Hazardous Environment and Media

Protect product from hazardous environment and check for hazardous liquids/gases.

Depressurizing Systems and Normalizing Temperature

Ensure isolation, safety venting, and normalization of temperature before work.

Tools and Consumables

Ensure appropriate tools and consumables are available before starting work.

Protective Clothing

Consider protective clothing for hazards like temperature, chemicals, radiation, eyes, face, noise, falling objects.

Permits to Work

All work under supervision of a competent person; use 'Permit to work' system.

Brief Product Information

Description

Cast iron single orifice float trap with integral automatic air venting facility.

Sizes and Pipe Connection

Available in DN 15, 20, 25 with Screwed BSPT/NPT/BSP or Flange connections.

Available Types

SOFT31-T (Thermostatic Air Vent), SOFT31-S (Steam Lock Release), SOFT31-ST (Combined).

Limiting Conditions

Specifies maximum pressure and temperature for different connection types.

Operating Range

Graph showing operating range of temperature vs. pressure for the trap.

Product Dimension and Drawing

Provides dimensional drawings and specifications for screwed and flanged versions.

Capacity Chart

Chart showing condensate capacity based on differential pressure for different sizes.

Product Working Principle

Installation Guidelines

Installation Checks and Steps

Steps for checking correct installation, removing protective covers, and ensuring component availability.

Discharge to Atmosphere

Ensure trap discharge to atmosphere is to a safe place at high temperatures.

Trap Orientation

Install the trap with the arrow on the name plate pointing downward for proper orientation.

Start-up and Commissioning

Flushing of Lines

Procedure for thoroughly cleaning piping and equipment before installation.

Commissioning

Confirming condensate is passing through the system after flushing and checking for leaks.

Setting of Steam Lock Release (SLR)

Procedure for setting the steam lock release mechanism for SLR or SLR+TV configurations.

Maintenance Guidelines

Routine and Preventive Maintenance

Describes routine checks and maintenance schedule for the trap.

Tool Kit

Lists the specific tools required for carrying out maintenance on the SOFT31.

Recommended Tightening Torques

Provides torque specifications for various components during maintenance.

Maintaining; Replacing the Main Valve Assembly

Step-by-step guide for maintaining or replacing the main valve assembly.

Procedure to Fit SLR Assembly

Instructions for fitting the steam lock release (SLR) assembly.

Inspection and Maintenance of Air Vent Assembly

Guide for inspecting and maintaining the air vent assembly.

Steam Trap Testing

Methods for determining the operating condition and performance of a steam trap.

Troubleshooting

Not Discharging At All

Possible causes and remedies for the trap failing to discharge condensate.

Leaking Steam

Identifies causes and solutions for steam leakage from the trap body or outlet.

Not Discharging Enough Condensate

Addresses issues related to reduced condensate carrying capacity and flooding.

Available Spares

Spare Parts Table

Lists available spare parts, their types, specifications, and codes.

How to Order Spares

Instructions on how to correctly order spare parts for the trap.

Warranty Period

Forbes Marshall SOFT31 Specifications

General IconGeneral
BrandForbes Marshall
ModelSOFT31
CategoryIndustrial Equipment
LanguageEnglish