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 13 of 45

Established by E. Morin

To the attention of Ms. Beatriz Herrero-Gonzalo

In order to keep the coil wet at all operating conditions and assure a very good steam quality, a

minimum of 20% excess water is required.

This part of excess water is heated from feedwater tank temperature to saturation (170°C/7 barg)

and evacuated by the steam trap at the separator outlet. This condensate is then sent to the

atmospheric feedwater tank.

Consequently a part of condensate will vaporize from 7 to 0 barg generating 13.5% of flash steam in

the feedwater tank.

Condensate from separator going back to the feedwater tank is useful to maintain the feedwater at

high temperature (90°C minimum required).

We indeed observed that the average temperature in the tank is above 95°C.

Therefore, no extra-steam is needed to maintain the temperature.

However the feedwater tank is still overheated.

Usually, condensate from separator is connected to the bottom of the feedwater tank (under the

water level) using a sparger tube :