Preservation, Lay Up and mothballing different

[zacharialamsyah]

Sometimes I have this terms: Preservation, Lay Up or Mothballing have a same meaning or similar definition.

But i know exactly there are a clear definition which make them different

Can Anybody help me how to distinguish the meaning of each terms mentioned above?

Thanks you for your answer and explanation

Best Regards
Zachari Alamsyah

 

[bimr]

Preservation of idle equipment installed in the plant involves safeguarding unattended and inactive equipment from deterioration during a down period. Deterioration of equipment during periods of down time is usually caused by conditions entirely different from those that exist during operation. Many deposits formed during operations turn usually corrosive under shutdown conditions. Moisture, oxygen, dirt, dust, ultraviolet rays, extreme pressure and temperature, corrosive environment of coastal areas and closeness to other chemical plants, are the some of the
factors causing deterioration. Preservation of static and rotary equipment and their spare parts, which are required to be kept in store for prolonged periods, needs to be carried out to prevent their deterioration, and as such preservation procedures for the equipment/spares kept in store should be adopted. New equipment received at project sites should be preserved considering manufacturer’s recommendations.

Short-term layup: is also known as seasonal layup. Usually, this period extends for three months or less, so no equipment dismantling is involved. Little or no maintenance is performed and all components are left ready to run.

Extended layup: could be anywhere from 3 to 24 months and may have an undetermined timeframe. Typically, steps must be
taken to prevent corrosion and air and moisture intrusion. Drainage may be necessary for fluids, temporary heaters or
dehumidifiers could be required, and certain equipment may be isolated or disconnected.

Mothballing: is similar to extended layup, but the timeframe is indefinite - usually well over 12 months. It would require major work and expense to restore operations. The owner may elect to sell off pieces of equipment, or the entire plant.