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LittleInch thank you, I will definitely look into this duplex filter, hopefully I have enough room to fit it in.

Lilliput1 thank you "Also if the absolute pressure gauge is too expensive consider using a compound gauge instead" --------- is this identical to a vacuum gauge ? I currently have a vacuum gauge at suction that reads -Hg vacuum and +psig. Its on the thermal relief piping on picture attached above.

thanks LittleInch, Wouldn't it just be easier to install a differential pressure gauge? -------------It would, my hope is to use the gauge to monitor the pump suction, not only the differential pressure across the strainer. so the gauge downstream of the strainer would double up as the pump...

Thanks gentlemen, very useful contributions. have any of you found these to be useful at the suction of a pump for monitoring purposes. see my application in the picture. I am thinking of installing absolute gauges at the suction of the pump, one upstream and one downstream of the strainer...

what about this one, this seems to be an absolute gauge,http://files.engineering.com/getfile.aspx?folder=1e71bee2-f21c-4c2e-927b-6ea2850fa7b9&file=1279_Pressure_Gauge_Data_Sheet.pdf

Does anyone know the physical difference between an absolute pressure gauge and regular pressure gauges. I am not looking for definitions or differences between absolute and gauge pressure, I am looking to physically identify an absolute gauge. I want to order a few but I am not sure. I intend...

In my facility, we try to avoid threaded couplings at all times, its always a source of a leak. so it depends on the regulations and maintenance practices. here any leaks to atmosphere, even to containement is unacceptable, we have ambitious goals about leaks, we document every drop of every...

you may find this intresting http://www.pumped101.com/velocity%20head.pdf

well you mentioned that you wanted to calculate the TDH my understanding is that TDH = algebraic sum of discharge heads - algebraic sum of suction heads you add the "static heads' and subtract "friction" and "suction lifts heads" based on your specific application.

Its often advisable to consider the difference in velocity head, suction to discharge

what is the purpose of the "pigging", when performing hydrotests you typically pig the line to get rid of the product while filling up the pipeline with water. If you can use a foam pig then your pigging vendor may be able to specify an adequate pig but if you are using hard pigs or smart pigs...