Clayton Armstrong 2011-02-22 GSK Aranda SP - steam&condensat

STEAM AND CONDENSATE AUDIT

Project N°30275

Date: 04/02/2011

GSK MANUFACTURING Aranda, Spain

Page 15 of 45

Established by E. Morin

To the attention of Ms. Beatriz Herrero-Gonzalo

Excess feedwater load

In theory, a minimum of 20% excess water is required for a good operation of the steam generator.

This percentage is set and the feedwater pump has a fixed pumping rate.

It is possible to check if the amount of excess water is in a normal range as it is directly linked to the

amount of condensate evacuated from the steam trap.

The Clayton booklet explains how :

We did measure the opening time for the steam trap when the Clayton was at 25-30% load. I was

about 10 minutes per hour. This value is too high considering the explanation above. We therefore

conclude that the amount of excess water set is too high (about 40%) and so is the amount of flash

steam generated in the feedwater tank.

4.2 Optimization

To prevent from too much flash steam loss at the feedwater tank vent we recommend to:

1. Check with your Clayton distributor if a technician can reduce the amount of excess

water pumped to run properly the generators

2. Move condensate connections from the top to the bottom of the feedwater tank using

a sparger tube : it will help to have an homogeneous feedwater temperature in the

tank

3. Recover condensate heat to preheat combustion air up to 50°C. The solution consists

in installing a coil to heat combustion air using a part of condensate from Clayton

separator.