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1. Comparison of pressure loss between orifice flowmeter and Velbar flowmeter

The pressure loss of Velbar flowmeter is much lower than that of orifice flowmeter, and its permanent pressure loss reduction ratio can reach 98.88%. It is an efficient and energy-saving flow measurement device. The following analysis is conducted from three aspects: principle, pressure loss calculation, and practical cases. The measurement principle and pressure loss source are both based on the differential pressure measurement principle: when the fluid flows through the throttling device, local contraction causes an increase in flow velocity, resulting in a static pressure difference between upstream and downstream. The essence of pressure loss is the irreversible conversion of fluid mechanical energy into thermal energy, mainly due to the formation of vortices and friction along the way. Orifice flowmeter: When fluid passes through an orifice plate, a large number of vortices are formed due to severe contraction/expansion of the orifice, and the fluid rubs violently against the orifice plate wall, resulting in significant pressure loss. Weiliba flowmeter: adopting a bullet shaped design and streamlined structure to allow fluid to pass smoothly and reduce vortex areas; At the same time, the surface is smooth, reducing friction along the way and significantly reducing pressure loss. Calculation and Comparison of Pressure Loss for Orifice Flow Meter: The empirical formula for pressure loss is $PPL_o=0.6 times Delta P $when β=0.6. When β=0.7, $PPL_o=0.5 times Delta P $, where β is the aperture ratio and $Delta P $is the differential pressure generated by the orifice plate. Velbar flowmeter: The pressure loss formula is $PPL_v=0.03 ti

mes Delta P $. The differential pressure Delta P $itself is one order of magnitude smaller than the orifice plate, and the pressure loss ratio coefficient (0.03) is much lower than that of the orifice plate (0.5~0.6), so the total pressure loss is significantly lower. Comparative conclusion: The pressure loss of Velbar is only about 1/100 of that of the orifice plate (such as the orifice plate pressure loss of 15.0KPa in the case, and Velbar pressure loss of only 0.168KPa). Actual case verification takes steam measurement as an example (pipe diameter Φ 325 × 13mm, pressure 3900KPaG, temperature 450 ℃, flow rate 50T/H): Velbar flowmeter: differential pressure $Delta P=5.600KPa $, pressure loss $PPL_v=0.03 times 5.600=0.168KPa $. Power loss $H_p=frac {Q times PPL_v} {eta}=frac {1.110 times 0.168} {0.8}=0.233KW $. Annual energy consumption cost: $365 times 24 times 0.233 times 0.8 approximately $1633 per year. Orifice flowmeter: When the differential pressure Delta P is 30KPa and β=0.7, the pressure loss PPL_o is 0.5 times 30=15.0KPa. If calculated according to the same formula, the power loss will be much higher than the power bar (not fully calculated in the case, but the difference in pressure loss already reflects energy efficiency). The reduction ratio of pressure loss: $frac {15.0-0.168} {15.0} times 100%=98.88%, which means that the power bar reduces permanent pressure loss by nearly 99%. Summary: The Weiliba flowmeter significantly reduces eddy currents and friction by optimizing the shape of the throttling element, achieving extremely low pressure loss. Its pressure loss is only about 1% of the orifice plate, which can significantly reduce energy consumption costs in long-term operation, especially suitable for ind

Orifice flowmeter price

1. Comparison of pressure loss between orifice flowmeter and Velbar flowmeter

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