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A sieve, or sifter, is a device for separating wanted elements from unwanted material or for characterizing the particle size distribution of a sample, typically using a woven screen such as a mesh or net. The word "sift" derives from 'sieve'. In cooking, a sifter is used to separate and break up clumps in dry ingredients such as flour, as well as to aerate and combine them. A strainer is a form of sieve used to separate solids from liquid.
Some of industrial strainers available are simplex basket strainer, duplex basket strainer, and Y strainer. Simple basket strainer is used to protect valuable or sensitive equipment in systems that is meant to be shut down temporarily. Some commonly used strainers are bell mouth strainers, foot valve strainers, basket strainers etc; 
Hand sieving is a simple technique for separating particles of different sizes. A small sieve such as used for sifting flour has very small holes. Coarse particles are separated or broken up by grinding against one-another and screen openings. Depending upon the types of particles to be separated, sieves with different types of holes are used. Sieves are also used to separate stones from sand. TRIAGE sieve : grouping people according to their severity of injury.
A wooden sieve is a sieve made of wood. The mesh might be made from wood or wicker. Use of wood to avoid contamination is important when the sieve is used for sampling. Henry Stephens, in his Book of the Farm, advised that the withes of a wooden riddle or sieve would be made from fir, willow with American elm being best. The rims would be made of fir, oak or, especially, beech.
A sieve analysis (or gradation test) is a practice or procedure used (commonly used in civil engineering) to assess the particle size distribution (also called gradation) of a granular material. Sieve sizes used in combinations of four to eight sieves.
Designations and Nominal Sieve Openings
|Tyler (inch/#)||Sieve (inch/#)||Sieve Opening (in)||Sieve Opening (mm)|
|2.97 inch||3.0 inch||3.0||75|
|2.10 inch||2 inch||2.00||50|
|1.48 inch||1-1/2 inch||1.50||37.5|
|1.05 inch||1.06 inch||1.06||26.5|
|0.883 inch||7/8 inch||0.875||22.4|
|0.742 inch||3/4 inch||0.750||19.0|
|0.624 inch||5/8 inch||0.625||16.0|
|0.525 inch||0.530 inch||0.530||13.2|
|0.441 inch||7/16 inch||0.438||11.2|
|0.371 inch||3/8 inch||0.375||9.5|
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