Monitoring Heat Exchanger Temperature

When a customer contacts us about vacuum pump performance issues, one of the first things we review is the operating temperature of the pump and its seal water system. Temperature can provide valuable insight into the overall health and efficiency of a liquid ring vacuum pump.

Why Temperature Matters

Liquid ring vacuum pumps rely on seal liquid to maintain performance and create the vacuum process. If seal water temperatures become too high, pump efficiency can decrease, operating costs can increase, and achieving the desired vacuum level may become difficult.

Monitoring temperatures regularly helps identify developing issues before they result in downtime or reduced performance.

Key Temperature Measurements

To assess pump performance, we recommend recording the following temperatures:

• Seal water supply to the pump
• Seal water discharge from the separator
• Process gas or air inlet temperature
• Ambient operating conditions (if relevant)

Always record the date and operating conditions when collecting data. Seasonal changes can significantly influence temperatures, making historical comparisons more meaningful when the timeframe is documented.

What Your Readings Can Tell You

Regular temperature monitoring can help identify common operating issues:

• Elevated Seal Water Temperature

High seal water temperatures can negatively impact vacuum performance by increasing vapor pressure inside the pump. This is particularly important during warmer months when incoming water temperatures are naturally higher.

• Large Temperature Increase Across the Pump

A significant temperature rise between the seal water entering and leaving the system may indicate:

• Restricted water flow
• Plugged strainers or orifices
• Insufficient seal water supply
• Process conditions generating excessive heat

Any sudden change from normal operating temperatures should be investigated.

• High Process Gas Inlet Temperature

Recording inlet gas temperature can help determine whether process conditions are affecting pump performance. Hot process gases can increase pump operating temperatures and reduce achievable vacuum levels.

Establishing a Baseline

One of the most effective maintenance practices is establishing a baseline when the pump is operating normally. Future temperature readings can then be compared against this baseline to quickly identify trends or developing issues.

Consider recording:

• Seal water inlet temperature
• Seal water outlet temperature
• Vacuum level
• Motor load
• Process gas inlet temperature
• Date and operating conditions

Tracking these values over time makes troubleshooting faster and helps improve equipment reliability.

Temperature monitoring is an excellent first step in evaluating the condition of your liquid ring vacuum pump. If abnormal readings persist or performance declines, consulting an experienced service team can help identify the root cause before it impacts production.

Our NASH Certified® Service technicians can assist with troubleshooting, performance evaluations, maintenance recommendations, and repairs to help keep your vacuum system operating efficiently.

Contact us today to learn more about optimizing the performance of your NASH liquid ring vacuum pump and vacuum system.