![]() Then, divide the circumference by 3.1416 to obtain the actual OD of the pipe. The best way to measure the OD of a pipeline is to wrap a measuring tape around the pipe to measure the pipe’s circumference. This issue occurs in many industries and can result in project problems. Therefore, 2” nominal fittings would be too large for the pipe measured. 2” would be very close to the actual OD of a 1 ½” (nominal) pipe size, not a 2” pipe. It is difficult to accurately measure a round pipe by holding a tape measure across it. The customer measuring the pipe was thinking actual inch values instead of the actual ANSI nominal pipe size. The actual outside diameter (OD) of 2” pipe is 2.375” while the inside diameter (ID) is more likely 2”. In this case, the customer measured the outside diameter of the pipe and ordered based on a 2” pipe. Customer ‘measures’ the pipe and orders 2” unionsĬustomer calls the supplier to report that the fittings are too large. Supplier confirms stock and asks for size. The following is an example of typical miscommunications when pipe measurements are required:Ĭustomer calls the supplier to order insulated pipe unions. Pipe Measurement Miscommunication Example ![]() To accurately measure and order pipes and accessories, it is important to follow ANSI Pipe Schedule Standards. ![]() In the design, it is common to specify certain types and sizes of pipefittings, such as an insulated pipe union, in order to produce an effective and efficient CP system. Cathodic protection (CP) systems are designed for many different types and sizes of pipe. EXPERT TIP #2: PIPES – HOW TO TAKE AN ACCURATE PIPE MEASUREMENT (ID or OD)?Īs in any industry, accurate communication is key to minimizing errors in system designs and material supply. ![]()
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