Blanketing is referred to as padding both in tanks and pipeline, is a process of applying gas to the empty space in a storage container and pipelines to counter the effect of oxygen in the container. Storage container may be, water tank, oil tank or fuel tank preferably any container that can be used to store product.
Benefits of blanketing are:
 Longer life of the product in the container
 It reduce hazard
 And longer equipment life cycles.
Nitrogen is widely used due to its inert properties, as well as its availability and relatively low cost. Tank blanketing is used for a variety of product including cooking oil, combustible product and purified water.
The use of an inert blanketing gas for food products helps to keep oxygen levels low in and around the product. Low levels of oxygen surrounding the product help to reduce the amount of oxidation that may occur, and increases shelf life.
When considering the application for combustible products, the greatest benefit is process safety. Since fuels require oxygen to combust, reduced oxygen content in the vapor space lowers the risk of unwanted combustion.
Tank blanketing is also to keep contaminant out of a storage space. This is accomplished by creating positive pressure inside the container. This positive pressure ensures that if a leak should occur, the gas will leak out rather than having the contaminants infiltrate the container. Some examples include its use on purified water to keep unwanted minerals out and its use on food products to keep contaminants out.
However, blanketing protect interior pipeline walls from corrosion during extended out of service periods, Ideal for removing water after hydro testing and protecting moisture sensitive products.
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See More: Blanketing: In pipelines and tanks, see how it works