The term NB (Nominal Bore) is often used interchangeably with NPS (Nominal Pipe Size). As the stainless steel cools down the metal can naturally contract, therefore accuracy is difficult to control. The process to manufacture schedule pipe is referred to as hot rolling which implies rolling stainless steel at high temperatures to form into the desired shape. Schedule pipe typically has a welded seam and is therefore technically non-sanitary. For example at 50NB, Schedule 10 and schedule 40 both have an OD of 60.33mm but schedule 40 has thicker walls and a smaller Internal Diameter.Īll the applicable schedule pipe fittings are manufactured to standard ASME B16. It is worthwhile to note, the outside diameter of the pipe doesn’t change, only the wall thickness and inside diameter. The higher the schedule number is, the thicker the pipe is and the more pressure it can handle. Typically stainless in New Zealand is available in Schedule 10, Schedule 40 and sometimes in Schedule 80.
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