Flow meter

Orifice plate flow meters are widely used in industrial applications to measure fluid flow rates. Their accuracy, however, relies heavily on proper installation, particularly regarding the lengths of straight pipe required upstream and downstream. These straight sections help ensure a stable, predictable flow profile that yields accurate measurements. Below is a detailed exploration of the […]

1. Basic Requirements The accuracy of an orifice plate flowmeter largely depends on sufficient straight pipe runs upstream and downstream of the orifice plate. General recommendations are: Upstream straight pipe: ≥ 10D (D = internal pipe diameter) Downstream straight pipe: ≥ 5D These values represent minimum requirements under normal conditions. 2. Influencing Factors and Special

Abstract Orifice plates and nozzles are two of the most widely used primary elements in differential pressure (DP) flow measurement. Both create a localized constriction in the pipeline to generate a pressure drop, which is then related to flow rate using Bernoulli’s and continuity equations. Despite sharing the same principle, they differ significantly in geometry,

Abstract Averaging Pitot tube flowmeters are often applied in steam measurement due to their simple structure and low pressure loss. However, when used for wet steam, they frequently produce significant measurement errors. This paper analyzes the mechanism of error generation, highlights the impact of incorrect installation, and provides practical recommendations for improving accuracy. It also

Abstract During ultrasonic flow measurement, users may occasionally observe a sudden drop in the indicated flow rate, followed by recovery within 2–3 seconds. While pipeline bubbles are a common cause, they are not the only factor. This document systematically analyzes the potential causes, provides diagnostic methods, outlines step-by-step troubleshooting, and summarizes real-world case studies. 1.

Abstract Vortex flowmeters are widely used for measuring gas, steam, and liquid flows in industrial processes. Since vortex flowmeters measure operating (actual) volume flow, temperature and pressure compensation is required under certain conditions to ensure accuracy. This article explains when compensation is necessary, the underlying principle of density correction, the sequence of compensation steps, and

A Practical Guide to 9 Common On-Site Installation Issues Flowmeters are indispensable instruments in modern industrial processes. Yet, many measurement inaccuracies, maintenance challenges, or even outright failures are often not due to the meter itself—but rather to improper installation practices.From insufficient straight pipe lengths for electromagnetic flowmeters, to misaligned filters in rotameters, or incorrectly oriented

Rotameters, as flow measurement instruments, are essential for various applications where on-site flow indication or remote alarm and measurement are required. This article outlines the selection criteria for different types of rotameters, detailing the considerations to ensure optimal performance and reliability. 1. General Guidelines for Selecting Rotameters When choosing a rotameter for applications involving small

1. Principle of Venturi Flow Measurement The Venturi flowmeter operates on the Venturi effect, a fluid dynamics phenomenon described by the Bernoulli equation.When a fluid passes through the constricted throat section of a Venturi tube, its velocity increases while the static pressure decreases, maintaining energy conservation. 2. Structure of Venturi Flowmeters A standard Venturi tube

1. Core Installation Principles 1.1 Flow Direction and Vertical Alignment The rotameter must be installed vertically, with fluid flowing from bottom to top through the tapered tube. The deviation from the vertical axis should be less than 2°. For special horizontally-installed models, ensure the measuring tube remains level, with full pipe conditions. Horizontal deviation should