4/30/2023 0 Comments Daniel Orifice Sizing Software![]() ![]() Not only does this weaken the pipe, but the practical necessity of drilling the tap holes in the installed location rather than in a controlled manufacturing environment means there is considerable room for installation error. Radius taps are an approximation of vena contracta taps for large pipe sizes (one-half pipe diameter downstream for the low-pressure tap location).Īn unfortunate characteristic of both these taps is the requirement of drilling through the pipe wall. ![]() Vena contracta taps offer the greatest differential pressure for any given flow rate, but require precise calculations to properly locate the downstream tap position. Most of the other tap configurations require drilling into the pipe after installation, which is not only labor-intensive, but may possibly weaken the pipe at the locations of the tap holes. ![]() Orifice TappingĪn overview of the most popular tap locations for orifice plates is shown in the following illustration:įlange taps are the most popular tap location for orifice meter runs on large pipes in the United States.įlanges may be manufactured with tap holes pre-drilled and finished before the flange is even welded to the pipe, making this a very convenient pressure tap configuration. In reality, this ideal is never perfectly achieved. ![]() Ideally, the upstream pressure tap will detect fluid pressure at a point of minimum velocity, and the downstream tap will detect pressure at the vena contracta (maximum velocity). Several standards exist for orifice pressure tap locations. ![]()
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