Flow meter

1. Introduction In industries such as energy, chemical processing, and food production, accurate fluid measurement is critical for process control, fiscal metering, and safety compliance. The Roots flow meter, also known as the lobed gear meter, is highly regarded for its precision in measuring high-viscosity fluids. However, its mechanical accuracy must be maintained through regular […]

A city centralized heating system consists of four main parts: heat sources, heating networks, heat exchange stations, and various forms of heat users. This system supplies effective heat through centralized heat sources, using hot water or steam as the transmission medium via heating networks, meeting the heating demands of an entire region or city, including

0) Summary (for busy engineers) Common symptoms in large‑bore steam service: zero drifting, negative oscillation, large bias. Root causes: poor straight‑run, wrong cross‑section position, two‑phase effects, impulse/condensate handling, orientation error. With correct siting, impulse design, and anti‑interference measures, ±2.5% is achievable in real plants. 1) Straight‑Run Requirements Goal: let the velocity profile re‑develop into a

Executive summary Most accuracy problems come down to four buckets: installation, fluid properties, device faults, and external interference. Use the triage table below, then follow the corrective actions. 1) Rapid triage (symptom → likely cause → how to check → fix) Symptom Likely cause How to check Corrective action Reading drifts / unstable Not full

0. Abstract This document summarizes core selection principles and field-proven troubleshooting methods for six mainstream flowmeter types: Orifice (standard DP), Averaging Pitot Tube, Flow Nozzle, Vortex, Ultrasonic, and Variable Area (Rotameter). It is intended for plant design reviews, commissioning, and maintenance. 1. Selection Principles (Five Key Factors) 1) Instrument performance Range setting: Upper range ≈

1. Units of Flow Measurement, Range, and Accuracy 1.1 Selection of Flow Measurement Units Flow measurement units should be chosen based on the type of flow being measured and adhere to the following guidelines: Volume flow rate: Should be expressed in m³/h or L/h. Mass flow rate: Should be expressed in kg/h or t/h. Standard

Flow measurement is a critical function in process industries, and differential pressure (DP) flow meters remain among the most widely used devices. Within this category, two commonly used types are the standard orifice plate and the balanced flow meter (often referring to a multi-hole balanced orifice plate). While both rely on the same working principle—creating

1. Preparation  Before starting troubleshooting work, contact the production unit to understand the fault phenomenon and operating status by checking historical trends, valve openings, and communicating with operators. Initially determine whether the problem is caused by the instrument or the process. – For general measurement loops: Obtain process permission before starting work. – For control

Choosing the right water metering technology is crucial for ensuring accurate measurement, operational efficiency, and long-term reliability. With multiple options available, three of the most common choices are ultrasonic water meters, electromagnetic water meters, and industrial electromagnetic flow meters. Although they may look similar at first glance, their design, application, and performance differ significantly. This

In a Distributed Control System (DCS), a deadband (also called hysteresis) is a designated range above and below an alarm setpoint. Within this range, small parameter fluctuations will not trigger an alarm, even if they approach the alarm limit. The deadband setting acts as a “no-alarm zone,” effectively preventing frequent alarms caused by minor, often