Frequently Faced Problems
Presence of moisture after hydro testing in pipelines or vessels causes corrosion and contamination of flowing fuel. Presence of water in gas transporting pipelines also leads to stress corrosion cracking.
Within a short span of time, stress corrosion can lead to complete failure of extensive stretches of the pipeline.
It is highly recommended that hydrotested pipelines are dried completely with no traces of moisture left behind.
4 commonly used drying methods used for drying pipelines are:
- Dry air through dehumidifier
- Nitrogen purge drying
- Vacuum drying
- Hot air drying by compressed air dryer
TDS provides desiccant based dehumidifiers along with auxiliary air handling equipment for pipeline drying.
Dehumidifier, heaters & blowers are installed at the suction end of pipeline and dry air is supplied continuously by the dehumidifier. This adsorbs all the moisture present in the pipeline. Dry air is supplied at a positive pressure of 100 changes/hr. When this comes in contact of moisture, it picks up water vapour present in the pipeline after a certain duration. Proper drying of pipeline is achieved when the grain level of the air at the inlet and outlet becomes equal.
- All free water is removed from the pipeline.
- Very low dew point of air can be achieved .
- Drying time is accurate and can be programmed according to period available.
- Installation of dehumidifiers is done by the technical team with over 15 years of experience in short term humidity control.