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This, in itself, is not very useful without being able to predict the pressure losses that will occur in particularВ circumstances. This Module considers Schedule 40 pipework as covered in BSВ 1600.Д«ernoulli relates changes in the total energy of a flowing fluid to energy dissipation expressed either in terms of a head loss hf (m) or specific energy loss g hf (J/kg).

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Only Schedules 40 and 80 cover the full range from 15 mm up to 600 mm nominal sizes and are the most commonly used schedule for steam pipe installations. A 100 mm Schedule 80 pipe has an outside diameter of 114.30 mm, a wall thickness of 8.56 mm, giving a bore of 97.18 mm.A 100 mm Schedule 40 pipe has an outside diameter of 114.30 mm, a wall thickness of 6.02 mm, giving a bore of 102.26 mm.As the schedule number increases, the wall thickness increases, and the actual bore is reduced.

Regardless of schedule number, pipes of a particular size all have the same outside diameter (not withstanding manufacturing tolerances). For nominal size piping 150 mm and smaller, Schedule 40 (sometimes called вЂstandard weightвЂ™) is the lightest that would be specified for steam applications. There are eleven Schedules ranging from the lowest at 5 through 10, 20, 30, 40, 60, 80, 100, 120, 140 to schedule No.

These schedule numbers bear a relation to the pressure rating of the piping. There are a number of piping standards in existence around the world, but arguably the most global are those derived by the American Petroleum Institute (API), where pipes are categorised in schedule numbers. What are the international piping standards?

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