Piping Reference Tables

What is in this section

The pipe, flange and fitting pages each answer a question about one size or one class. The tables here answer questions that run across the whole range: every size against its metric designator, every schedule against every size, every pressure class against temperature. They are the charts that used to be pinned to the wall of a drawing office.

Which table answers which question

• A drawing gives a DN and you need the inch size. Use the NPS to DN conversion chart. Both are labels, so the chart also gives the true outside diameter.
• You need a wall thickness and know the size and schedule. Use the pipe schedule chart, or for stainless the stainless schedule table, which shows where the S schedules part from the carbon steel ones.
• You are estimating a lift or a support load. Use the pipe weight chart, and remember to add the contents.
• You need to know what a flange class will hold. Use the pressure-temperature ratings, choosing the material group first and the temperature second.
• You are making up a flanged joint. The flange bolt chart gives the number and size of bolts, and the flange face reference the facing and gasket.
• You have an ASTM grade on a certificate. Use the material grades table to see what product form and steel it is.
• You are labelling finished pipework. Use the pipe colour coding page for marker colours and letter heights.

Where the method is explained

A chart gives the figure and leaves the reasoning out. The guides supply the reasoning, with a worked example for each, and the comparisons set two choices side by side when the question is which of them to use.

Guides that go with these tables