Difference between lbs and class#

[naraien]

thread408-21855

for my new project, my specifications for Y-strainer call for 600lbs but my supplier offer for #150. Anyone know where to refer the difference between 'lbs' and class pressure rating?

 

[LittleInch]

The post you refer to has the answer.

You need to use class and design pressure.

On the minimal information provided it would appear to be incorrect by the vendor. Maybe he doesn't make class 600 strainers.

Don't use lbs or # in a specification to indicate class. It is incorrect and doesn't mean anything.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[zdas04]

The specification I'm seeing most often these days is "ASME B16.5 Class 300" for the flange we used to call "ANSI 300 lb". The reason for this change is that a "300 lb" flange is usually rated to somewhere around 600 psi depending on material class and temperature and the confusion has been pretty significant over the years.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

 

[Gilmiril]

Historically, both "lbs" and "#" have been used synonymously to mean "pound", so there should be no difference between 600# and 600lbs. Likewise, there is no difference between 150# and 150lbs. But if you requested 600lbs and were offered 150#, you need to get an explanation from the vendor.

And as others mentioned, the correct designation now is "class" rather than "lbs" or "#" or "pound".

 

[gerhardl]

A prayer to all US/English native engineers:

Being exposed to the US-based specifications for valves at the start-up of the North Sea oil exploration some decades ago, was a though ladder to climb. This especially as the (US) English language is 'unprecise', containing abbreviations, slang, and is more than many other languages depending on that 'everyone familiar with the branch' knows what the exact meaning of abbreviated words and half explanations are.

Please therfefore, pretend that all we foreigners are ten years old, and have never heard of the 'technical contraption' you are about to specify, please be exact and complete!