Tony Whitmore, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 III.B Static-Pressure Tubes 43–46 These usually include, beyond the estimation procedure itself, some basics and worked examples. There are also more comprehensive error estimation procedures available. The principles more or less follow those presented earlier in Treatment of Measurement Uncertainties. Usually a brief description of the estimation of the confidence limits is included in each standard. (12.30) and (12.31), influence the accuracy of the final flow rate. The use of flow straighteners is recommended in cases when a nonstandard type of upstream fitting disturbs the flow velocity profile.Įvery measured quantity or component in the main equations, Eqs. If the lower values in the brackets are applied, an additional ☐.5 uncertainty (error on 5% risk level) has to be added arithmetically to the flow coefficient confidence limits. Two or more 90° bends in different planesĮxpander (0.5D to D over a length of I D to 2D)
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