1️⃣ General Principles for Selecting a Steam Trap

Before selecting a steam trap, the following factors must be determined:

Type of equipment or application:
Heat exchanger, steam main, steam tracing, etc.

Operating pressure and temperature:
The steam trap must be able to withstand the corresponding pressure and temperature conditions.

Condensate flow rate:
The trap must be capable of discharging sufficient condensate to allow the equipment to operate at optimal efficiency.

Load variation:
If the load fluctuates, select a trap that can operate stably when condensate flow changes.

Steam retention capability:
The trap should minimize steam loss to improve energy efficiency.

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2️⃣ Steam Trap Selection by System Type

A. Heat Exchanger

Characteristics

• Large amount of condensate

• Condensate accumulation reduces heat transfer efficiency

• Continuous condensate discharge is required

Recommended Steam Trap Types

• Float Steam Trap

• Ball Float Steam Trap

Reasons for Selection

• Continuous condensate discharge without accumulation

• Stable operation even when load changes

Typical Applications

• Shell & tube heat exchangers

• Tank heating systems

• Drying equipment

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B. Steam Main

Characteristics

• High pressure

• Small amount of condensate, but must be removed to prevent water hammer

• Requires a durable and reliable trap

Recommended Steam Trap Type

• Thermodynamic Steam Trap (Disc Trap)

Reasons for Selection

• Excellent performance under high pressure

• Simple design with fewer failure points

Typical Applications

• Steam headers

• Steam main drip points

• Steam distribution lines

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C. Steam Tracing

Characteristics

• Small condensate flow rate

• Low to medium pressure

• Requires good steam economy

Recommended Steam Trap Type

• Thermostatic Steam Trap
  (Bimetallic or Balanced Pressure type)

Reasons for Selection

• Discharges condensate based on temperature difference

• Good steam retention for energy saving

Typical Applications

• Small tracing lines

• Tank pipeline heating

• Chemical tracing systems

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3️⃣ Quick Summary Table

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4️⃣ Technical Notes

Check actual condensate flow rate:
Select a steam trap with a capacity greater than or equal to the required discharge flow.

Back pressure:
Some steam traps are sensitive to back pressure, so this must be considered when installing traps at the end of pipelines.

Installation position:
Steam traps should be installed at the lowest point of the equipment or condensate collection point.

Maintenance:

• Mechanical traps (float / inverted bucket) require periodic inspection

• Thermodynamic traps generally have fewer failures

• Thermostatic traps are ideal for tracing applications and require less maintenance

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💡 Quick Selection Tips for Plant Engineers

• Heat exchanger → Float Trap

• Steam main → Thermodynamic Trap

• Steam tracing → Thermostatic Trap