Calculation methods and flow measurement design criteria are specified in Standards such as American Society of Mechanical Engineers (ASME) MFC 3M and PTC 19.5 and The International Organization for Standardization (ISO) 5167-4.Each standard states the coefficient of discharge or an equation for the coefficient of discharge as well as the uncertainty and ranges of diameter of the inlet, Reynolds Numbers, and Beta Ratio.
Each consists of a cylindrical inlet, conical convergent, cylindrical throat and conical divergent. The differential pressure connections are located on the inlet (upstream or high pressure) and in the throat sections (downstream or low pressure). A tap set includes two differential pressure connections, one high and one low pressure connection. MFC 3M and ISO 5167-4 define three types of venturi tubes; machined inlet, as cast and Rough-Welded (Fabricated). For the machined venturi, the inlet section and convergent must have the same surface finish as the throat section. The differential pressure connections (taps) may be integrally machined into the body or welded on. Machined venturis are commonly utilized in Nominal Pipe Sizes (NPS) of 6 and smaller. Typical components of Fabricated venturis include pipe for the inlet section, plate material for the convergent and divergent cones and forgings for the throat. Advantages of the dP Flow Tech Venturi Different by design: To ensure that the throat taps are manufactured properly, each throat tap is machined per their applicable design standard. The throat is extended on fabricated venturis to guarantee that the specified surface finish is provided for the entire throat length. Special fittings which are designed specifically for flow meters are utilized to meet or exceed the tap length specified in the reference. Experience: Our Engineering Team has over 25 years of experience in the design, manufacture, and flow calibration analysis of venturi tubes. Applications include Power, Chemical and Refining, Liquified Natural Gas (LNG) and others. Asme 19.5 Code Calculations ForOur team will not only verify compliance with the flow measurement standards, but we will verify code calculations for ASME B31.1 Power Piping and ASME B31.3 Process Piping for minimum wall thickness and, if applicable, verify the flange rating. We will also provide as built calculations utilizing the measured inlet and throat diameters and, if applicable, the laboratory determined coefficient of discharge. Engineering Services We can provide witnessing for Flow Calibration, analysis of flow calibration data and flow calculations. Also, we can review the specification for compliance of the flow standards and design codes.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |