6 min read
Class 150, 300, 600: Reading the Pressure-Temperature Table
A Class is not a pressure rating. The allowable pressure is read from the standard’s table together with body material and operati...
Standards articles
Technical articles on Standards: valve and expansion joint selection, application and installation notes.
Articles
6 min read
Gate Valves and DIN 3216, 3225, 3204: What the Number Actually Specifies
The DIN number on a gate valve is not a quality grade but a description of construction and face-to-face length. That is why a rep...
5 min read
Flange Gaskets and Bolt Sequence: What Actually Decides Sealing
Sealing in a flanged joint is decided less by the gasket than by how evenly bolt load is spread around it. Sequence and staging ma...
5 min read
DN/PN and NPS/Class: Two Systems Not to Mix
A Class is not a pressure value. The permissible pressure is read from the standard's table together with material and temperature...
5 min read
JIS Flanges 5K / 10K / 16K: Working With the Japanese Standard
JIS flanges have their own dimension tables and will not bolt to other families even when outside diameters look similar. On ships...
6 min read
JIS-Bodied and Bronze Valves: Standard and Material on Ship Piping
Choosing a valve on board is two separate decisions: which standard sets its dimensions, and which material it is made from. Neith...
5 min read
ASME B16.5 or B16.47 Series A? The Class Number Alone Is Not Enough
The same Class number appears in two different ASME flange standards, and where they overlap the dimensions differ. “A Class 150 f...
6 min read
Pressure Rating and Bolt Circle in PN Series Flanges
As the PN step rises, flange thickness, bolt count and bolt circle all change. Two flanges of the same size bolting together does...
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