Debottlenecking PET Warmer Line at a Beverage Plant in Thailand

A MNC beverage plant in Thailand was facing two scenarios in their PET line warmer:

Condensate temperature was 50°C (122°F), indicating stalling in the heat exchanger. This was impacting the process temperature (not achieving the set point) and heating time (which was longer).
Process temperature was exceeding the set point temperature by 10°C (50°F).

An energy audit of their steam system design and installation of a steam-operated pump trap (SOPT) along with a pressure powered pump package unit (PPPPU), helped the plant to resolve issues with process and condensate temperatures enabling 100% condensate recovery.

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PROBLEM

This plant was facing temperature variations against desired and delayed heating times at PET Warmer 9. Condensate was being recovered through trap pressure. Additionally, there was a 15-metre (49 foot) lift in the condensate line after the trap.

SOLUTION

Forbes Marshall conducted a plant-wide audit. Our recommendations for PET Warmer 9 involved installing a steam-operated pump trap (SOPT), eliminating the lift in the condensate line and using a pressure powered pump package unit (PPPPU) to transfer condensate to the boiler feedwater tank. A condensate recovery meter was also installed for real time accurate monitoring. These measures addressed the temperature issues in the Warmer and increased the condensate temperature from 50°C (122°F) to 86°C (186.8°F).