My concern is with coarser silt ( which are according to atterberg classification of grain size between 50 and 20 um ), is it advisable to sample them with the pipette without waiting for a time, or we use the sieving techniques like the sand?
Any soil particle larger than 50 micrometer would limit the use of Stoke's Law in soil suspension.
Stokes Law doesn't apply in turbulent flow (for typical densities > 50 um) and where the settling is not linear (< 2 um Brownian motion). Terry Allen in Particle Size Measurements quotes an applicable range for gravity settling as 2 - 50 um. You can, of course, always increase g (as in the disc centrifuge). However, Stokes will always provide a result whether applicable or not... Also see:
The Mariana Trench Problem (Lunch & Learn 11/7/2014)
http://tinyurl.com/koeuxw2
February 9th, 2012 Size and shape characterization in soils and sediments
https://www.brainshark.com/malvern/vu?pi=241199769&text=M021507&r3f1=
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