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Strainer guide Engineering Specification for the Selection Installation and Maintenance of Pipeline Strainers Prepared by PIPELINE STRAINER SECTION FLUID CONTROLS INSTITUTE INC CONTENTS ?? Pipeline Strainers ?? Definition Purposes and Types ?? End Connect

Engineering Specification for the Selection Installation and Maintenance of Pipeline Strainers Prepared by PIPELINE STRAINER SECTION FLUID CONTROLS INSTITUTE INC CONTENTS ?? Pipeline Strainers ?? Definition Purposes and Types ?? End Connections ?? Materials of Construction ?? Corrosion Resistance ?? Selection of Materials ?? Perforations and Mesh Sizing ?? Capacity ?? Pressure Loss ?? Specifications and Manufacturer Testing ?? Shock ?? Hydraulic and Thermal ?? Conclusion PREFACE Experience has proven the need for strainers in the protection of pumps compressors turbines meters automatic valves sprinkler heads burner nozzles steam traps and other pipeline equipment This guide has been established as a technical reference for project engineers and managers responsible for specifying and using pipeline strainers While strainers remain a relatively low cost item when specified properly the protection they provide is invaluable It is the intent of this guide to provide the background and information necessary to make knowledgeable and sound engineering decisions in the specification of pipeline strainers The Pipeline Strainer Section of the Fluid Controls Institute Inc acknowledges and appreciates the assistance of those people who have made the creation and updating of this technical resource possible CHAPTER Definition A pipeline strainer is a device which provides a means of mechanically removing solids from a flowing fluid This is accomplished by utilizing a perforated metal mesh or wedge wire straining element The most common range of strainer particle retention is ? to micron ? Purpose Strainers are employed in pipelines to protect downstream mechanical equipment such as condensers heat exchangers pumps compressors meters spray nozzles turbines and steam traps from the detrimental effect of sediment rust pipe scale or other extraneous debris Types of Strainers Specified strainers are the Y strainer and the basket strainer While there is primarily one type of Y strainer Fig A there are several variations of basket strainers Figs B through D Figure A Figure B Figure C Figure D Y Strainer Basket Strainer Vertical piping frequently found at pump inlets necessitates the use of a Y strainer or a tee type basket strainer Most basket strainers are intended for horizontal or slightly inclined piping Special attention must be given to the orientation of the debris collection chamber and the drain blowdown connection of the strainer The strainer must be installed such that it is located at the lowest possible position Fig For liquid flow a Y strainer in vertical piping must be placed with its screen in the downward position to trap the sediment in the debris collection chamber For steam service it is recommended that Y strainers be mounted sideways in horizontal lines to prevent condensate accumulation Liquid Flow Figure Tee type strainers suction diffusers and several variations of basket strainers can also be used in a right angle flow application Fig Figure Y strainers and most variations of basket strainers can be self-cleaning With the addition of a blowdown valve and some modification of the straining element of a basket strainer the element can be flushed out by opening and