Natural Gas in its raw form must be treated (cleaned) in stages to make it become the reliable source of clean power needed in many industries

A Strainer is usually the first step to remove contaminants from Natural gas

Natural gas is a mix of combustible gases (mostly methane) available in the earth crust, found in deposits made of rock formations, with coal beds, and some times along with crude oil formations.  In its natural occurrence, it includes both liquid and solid contaminant particles that must be removed since they affect its power generation capabilities, and also can damage industrial equipment, such as flow meters and valves.

Crude Oil and Natural Gas Extraction 2

The first piece of equipment used to filter larger contaminants from the natural gas stream (and many other fluids) is the Strainer. There are several advantages of using strainers as the initial step to process this fuel gas out of its natural deposit:

Cast Steel Simplex Strainer

-A strainer is robust. It consists basically of two parts: a vessel (or body), and a straining element (or basket). The body is metal (although lighter applications can allow the use of plastic or fibreglass bodies), either fabricated or cast.  The most commonly used is Steel, but there are other options like Iron, Stainless Steel (304 or 316), bronze, and some exotic alloys like Monel.   The cover is the part of the body that allows for the straining element to be removed and reused if properly cared for.

-The filter element (strainer element, also called basket) is cleanable and reusable.  This element is made of Stainless Steel and, if treated with care, it can be cleaned and reused many times (although a spare element is always recommended).  It consists of a perforated sheet of metal (usually ranging from 3/8” down to 1/16”, 9.525 to 1.588mm) and lined with a mesh that will define the size opening, i.e. the particle size to be retained (filtered) by the straining element.

-The filter element can be designed in a very wide range of opening sizes, which will determine the size of particles to be removed from the natural gas stream.  The perforation size of the metal sheet in the body of the straining element, if not lined with a mesh, will define the particle size.  In most cases there will be a mesh lining (some times two) which will dictate the size of the particles to be retained, and the range is quite wide: usually from a wide size mesh 10 (about 0.0787” or 2.000mm) down to a mesh 500 (0.001” or 0.025mm).  Mesh size should only be used for reference: it is not a precise measurement.  Instead, we use inches or microns.

-A strainer can come in different configurations, from a low capacity (and low cost) “Y” type strainer, to the more common Simplex strainer.  We must keep into consideration that the strainer (like any filtration equipment) will need some downtime to have its filtration element cleaned or replaced.  If the specific the application will not allow downtime, then a duplex arrangement must be considered.

Advanz Industrial Canada has the engineering knowledge and field experience to design and supply the best strainer option for your application.  We can also manufacture replacement straining elements for your already operating strainers.  Let us know of your project: we can help!

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