FAQs – Process Steam Traps

In process applications, steam must transfer its latent heat to the product, condensing into water that must be removed immediately. Unlike distribution, process equipment experiences varying loads and requires traps that handle massive startup volumes while maintaining constant heating.

Here are some frequently asked questions (FAQs) about process level steam trapping:

• Why are ball float steam traps better than inverted bucket steam traps for process applications?

Ball float steam traps discharge condensate continuously as soon as it forms, whereas inverted bucket traps are intermittent and can cause waterlogging.

• How do float-type steam traps improve batch times?

Float-type steam traps prevent condensate logging this allowing faster temperature ramp-ups.

• What is a Two Orifice Float Trap (TOFT)?

A two orifice float trap designed to handle heavy startup loads (up to 3x running load) by opening a second orifice during peak demand.

• What is stall in a heat exchanger?

Stalling in a heat exchanger is the inability to evacuate condensate because internal pressure  is equal to or less than backpressure.

• What are the symptoms of stall?

A noticeably cooler steam trap surface due to sub-cooled condensate backup or frequent control valve cycling is a symptom of stall.

• What is the solution for a heat exchanger stall?

Stalling in heat exchangers can be prevented by replacing a conventional steam trap with a Steam Operated Pumping Trap.

• What is group steam trapping and why is it discouraged?

Using one steam trap for multiple process equipment units is called group trapping. It leads to waterlogging because units with higher pressure lock out those with lower pressure.

• Should I return condensate using only trap pressure?

While many plants practice it, returning condensate using steam trap pressure is discouraged because backpressure reduces trap capacity and heat exchange efficiency.

• Why is a check valve (NRV) needed after a trap?

A check valve prevents backflow of condensate, protecting equipment from flooding and hydraulic shock.

• What is a Steam Lock Release (SLR)?

A manual needle valve that passes a tiny amount of steam to prevent steam locking in steam traps located far from equipment.

• How close should a steam trap be to the equipment?

Steam traps should be as close as possible to the equipment in order to prevent steam from collecting in the line and blocking condensate flow.

• Should steam traps be installed above or below equipment?

All process steam traps should be installed below the process equipment, so that condensate can flow to the trap by gravity.

• Which steam trap is best for a textile dryer or reactor?

A Two Orifice Float Trap or Multi-Utility Process Trap is typically the best choice for textile dryers or batch reactors.

• Can all process traps be insulated?

No. Only float type steam traps can be safely insulated without affecting their operating cycle.