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Is anyone who can explain me, what are PN and PT ratings of valves and flanges ?

Is anyone who can explain me, what are PN and PT ratings of valves and flanges...???? i asked this question in my previous post but their are viewers but no answers..????

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تم إضافة السؤال من قبل SYED SHAMSHER ALI , Project Manager/Engineering , BETTER COMFORT SERVICES
تاريخ النشر: 2017/03/27
Waqar Ahmed
من قبل Waqar Ahmed , Instrument Technician , ADNOC Gas Processing

All Pipes and various pipe fittings are most commonly classified based on their pressure temperature rating or commonly known as P-T Rating. The most common way of specifying pipe pressure temperature rating is given by ASME 16.5, using pound ratings (or lb ratings) – #150, #300, #400, #600, #900, #1500 and #2500. The pressure rating or pound rating for a pipe is determined using the design pressure and design temperature for the pipe. Among other methods of classification by using pressure temperature ratings is ‘Pression Nominal’ or ‘Pressure Nominal’ or PN number method. This PN number is a rough indicator of pressure rating in bar.

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