Sealed water flow meter | Shaft seal flow switch (sealed water flow switch)

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1. What are the consequences of insufficient cooling water flow for double end mechanical seals?

Insufficient cooling water flow for double end mechanical seals can lead to seal failure and equipment damage.

1. Direct consequences: Sealing surface overheating damage • When the cooling water flow rate is lower than the design value (usually requiring a flow rate of ≥ 1.5m/s), frictional heat cannot be exported in a timely manner • When the temperature of the sealing ring exceeds the materials tolerance limit (such as carbon graphite ring>180 ℃), thermal cracking or bursting will occur • Auxiliary sealing ring (O-ring) accelerates aging at high temperature, loses elasticity, and causes leakage 2 Excessive medium leakage • Vaporization of liquid film between sealing end faces forms dry friction, resulting in a sharp increase in wear (up to 10 times normal working conditions) • Hard sealing rings (such as silicon carbide) may suffer from crushing damage • Seal leakage exceeds the national standard (GB/T 14211-2019 stipulates that the leakage rate should be ≤ 10mL/h when the shaft diameter is greater than 120mm) Bearing system failure • High temperature transmission to the bearing chamber leading to grease failure (lithium based grease tolerance temperature is usually<120 ℃) • When the bearing temperature rises above 75 ℃, it needs to be shut down for maintenance, otherwise it may hold the shaft. 2 Poor quality and pollution of process media • In the food/pharmaceutical industry, it may cause the entire batch of products to be scrapped (such as API standard requirement for leakage level<500ppm) • Leakage of flammable and explosive media in the chemical industry may cause safety accidents

III. Economic i

4、 The warning indicators that require immediate intervention include: - temperature rise in the sealed chamber>35 ℃ (relative to the medium temperature) - temperature difference at the cooling water outlet<3 ℃ - mechanical seal leakage for 2 consecutive hours>specified value. It is recommended to install a flow monitoring device (such as a target flowmeter) to ensure that the cooling water flow rate is maintained above the minimum value required by the equipment manufacturer (usually within the range of 1.8-2.2m ³/h).

2. What are the prerequisites for measuring flow rate with a flow meter?

When measuring flow rate with a flow meter, five core prerequisites must be met: matching the measured medium with the selected material, compliance with installation regulations, adaptation to operating parameters, regular calibration, and compliance with corresponding measurement standards.

1. Matching of measured medium and flowmeter selection (1) Matching of phase state and characteristics 1 It is necessary to match the phase state of the fluid. Vortex flowmeters can measure gases, trapped liquids, and steam, volumetric flowmeters are suitable for high viscosity media, electromagnetic flowmeters are only suitable for conductive media, and Coriolis mass flowmeters can measure some multi-mode combustion concept phase flow media; 2. It is necessary to consider the corrosivenes

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