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 44 of 45

Established by E. Morin

To the attention of Ms. Beatriz Herrero-Gonzalo

A Posipressure system allows air or nitrogen to push out the condensate as soon as the steam

pressure inside the heat exchanger is less than the back pressure in the condensate system. The

diagram below shows a typical setup for this arrangement:

A safety drain is a second trap that is sized to handle the same load as the primary trap. It is

located above the primary trap and discharges into an open sewer. When there is sufficient

differential pressure across the primary trap to operate normally, condensate drains from the drip

point, through the primary trap, and up to the overhead return line. When the differential pressure is

reduced to the point where the condensate cannot rise to the return, it backs up in the drip leg and

enters the safety drain. The safety drain then discharges the condensate by gravity.