Measurement of standard specifications for irrigation and drainage in Babbitt trough farmland

NegotiableUpdate on 01/04

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The standard specification of Babbitt trough for farmland irrigation and drainage measurement is called an open channel, which flows in a non full pipe state. The application of open channel flow meters includes urban water supply channels, cooling water intake and drainage channels for thermal power plants, sewage treatment inflow and discharge channels, industrial and mining enterprise wastewater discharge, as well as water conservancy engineering and agricultural irrigation channels

Product Details

construction

Measuring sinkFrom upstreamContraction segmentShort straight throat and downstreamDiffusion segmentComposed of three parts. The groove bottom of the contraction section tilts downstream, while the inclination direction of the groove bottom of the diffusion section is opposite to that of the throat groove bottom.

Measurement of standard specifications for irrigation and drainage in Babbitt trough farmland

otherconstant termExperimental confirmation is required, and the general situation is as follows:, F=60cm, G=90cm; K=8cm, N--23cm,x=5cm, y=8cm; Depending on the depth of the channel, the height above the upstream water level is 0.1-0.2cm, and generally 1.00 meters can be used. The length of the bottom protection upstream and downstream of the measuring tank is a function of the height H of the tank bottom:

Upstream bottom protection L,=4H;

Downstream bottom protection L,=(6 ^ -8) H;

Meanwhile, due to the high flow velocity in the measuring tank,throatThe fluctuation of the middle water level is also significant, making it difficult to directly measure the water level in the tank. Therefore, after setting up observation wells on the groove wall, safety measurements are takenwater gaugeThe bottom of the well is 20-25cm lower than the groove threshold, and a flat metal tube can be used for logging and measuring water tanksConcrete pipeConnection: The centerline of the pipe should be 3cm above the bottom of the groove. The upstream water gauge should be located upstream of the throat (2/3) from the beginning of the throat, and the downstream water gauge should be located 5cm above the end of the throat on the groove wall. The zero point of the upstream and downstream water gauges should be level with the height of the groove bottom, and there should be no water leakage in the observation well. The well should be regularly cleaned of sediment and covered with a lid to prevent debris from entering.

Purpose:

Compared to open channel flow meters(HZM-1D/WL-1A2Ultrasonic open channel flowmeter)Cooperate to convert the flow rate in the open channel into the height of the liquid level. Measure the flow rate of water in an open channel. The flow rate of irrigation channels, sewage ditches, and urban sewers.

Material:

Glass fiber unsaturated polyester composite material (fiberglass, thickness)1.3mm）.

Flow range:

Flow range:10rise/Seconds~1000rise/second(Determined by the specifications of the Bacher groove used)

feature

High precision, strong corrosion resistance, good weather resistance, not easily deformed or cracked, beautiful appearance, lightweight and high-strength

Measurement of standard specifications for irrigation and drainage in Babbitt trough farmlandPrinciples of Computing

open channelThe larger the flow rate inside, the higher the liquid level; The smaller the flow rate, the lower the liquid level. For general channels, there is no definite correspondence between liquid level and flow rate. Because the same water depth and flow rate are also related to the channelcross-sectional areaSloperoughnessof Installing a measuring weir groove in the channel, due to the gap of the weir or the grooveneckingCompared to the cross-sectional area of the channel, the correspondence between the upstream water level and flow rate of the channel mainly depends on the geometric dimensions of the weir. the sameMeasuring weir troughPlaced on different channels, the same liquid level corresponds to the same flow rate. The measuring weir channel converts the flow into liquid level. By measuring the liquid level of the water flow in the measuring weir tank, and then reverse calculating the flow rate based on the corresponding water level flow relationship of the measuring weir tank.

Notes:

•The centerline of the Bacher trough should coincide with the centerline of the channel,Make the water flow into the Bacher trough without any deviation.

•After the Bacher trough is filled with water, the flow state of the water should be free flowing. The submergence degree of the Bacher trough should be less than the specified critical submergence degree.

•The upstream of the Bacher trough should be greater than5A straight section that is twice the width of the channel, allowing water to smoothly enter the Bacher trough. There is no lateral deviation or the impact force formed by the slope of the channel.

•The Bacher groove should be securely installed on the channel. The connection with the side walls and bottom of the channel should be tight and not leak water. Make all the water flow through the measuring part of the Bacher trough. The measuring part of the Bacher trough is the throat section inside the trough