Strength and flow meter

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ZW - QLB seriesStrength and flow meter(also called flute velocity-equalizing tube flowmeter) is base…

Products overview:

ZW - QLB seriesStrength and flow meter(also called flute velocity-equalizing tube flowmeter) is based on the pitot tube principle of speed developed a kind of new type of differential pressure flow rate measurement.Simple structure, convenient installation, small pressure loss, use and maintenance cost is low, the global growing energy shortage as a result of economic rapid development today, is a worth promoting and using energy-saving economic flow meter, especially under the condition of the pipeline is greater than 200 mm, the advantages of the flowmeter are more obvious.Is internationally recognized as a source in traffic detection of zui high precision, good repeatability, reliable operation of a new type of plug flow meter.Therefore, in the electric power, metallurgy, petrochemical and other industries.

Second, the working principle:

ZW series - QLB strongly the average flow velocity of flow meter through pipes and pipe flow of product to determine the effective cross-sectional area.When the fluid flows through the sensor, a high pressure generated in the front of its distribution area, hydrostatic pressure slightly higher than the area of high pressure pipe.According to the principle of Bernoulli equation, to speed up the speed when the fluid flows through the probe, the probe at the back of the produce a low pressure area, the pressure is slightly lower than area of low pressure pipe of the static pressure.Fluid from the probe through the vacuum on the probe at the back of the part, and appear on both sides of the probe vortex.Average flow cross section shape of probe, the condition of surface roughness and low pressure hole location is the key to probe performance factors.Low voltage signal is stable and accurate, is crucial to average probe of precision and performance.Average flow probe can be detected accurately by the fluid produced by the average speed of the average differential pressure.Average flow probe in high and low pressure area according to certain criteria to take more pressure hole configuration, making it possible to accurately measure the average velocity.

Three, significant effect:

ZW series - QLB strongly the differential pressure transmitter output of flowmeter for the differential signal, and the measurement of differential pressure instruments and meters, can be accurately measured, pipe, rectangular pipe in a variety of liquids, gases and steam (superheated steam and saturated steam).The size of the pipeline under test range from 20 mm - 3000 mm.In the power industry (including nuclear industry) chemical industry, petroleum chemical and metal smelting industry departments such as the bank of China to the use of success, it is suitable for:

1, gas and liquid transportation;

2, energy research, steam boiler heat rate, efficiency of pumps, gas compressor efficiency and fuel consumption.

3, process control, input and output, ratio and balance;The cooling water or air, steam heating;

4, material of chemical industry.

Four, the main features:

1, the unique internal structure of quadratic mean, provides the high precision reading (+ 1%) and high repetition (plus or minus 0.1%).

2, the outer shock tube USES a single piece of material processing and welding, and welded together by twin hull structure similar products than those with natural zui, high strength and easy to use high temperature resistant, corrosion resistant material.

A, the hexagonal honeycomb structure stable, is produced by the unique shape of the distribution of a beam to ensure the stability of the low voltage signal, the differential pressure is higher than similar products, to improve the range ratio.

B, suitable for square or rectangular pipe.

C, measuring smudgy medium for the similar products in the inevitable congestion, there are online can be pulled up or provide manual and automatic purging methods and devices, not achieve production maintenance.

The 3 d, velocity-equalizing tube valve temperature transmitter, pressure compensation structure of integration, easy to use.

E, no flow coefficient, the long-term stability.

F, * provide intuitive resonance check, ensure the long-term stable operation.

G, small pressure loss of low energy consumption,

Five, the technical parameters:

1, specifications: (- DN5000 (mm);Insert: DN500 - DN5000 (mm);

2, the measurement accuracy: + / - 6.0%;Repeatability: + / - 0.1%;

3, scope: volume flow: 10:1;Mass flow rate: 8;

4, work stress: velocity-equalizing tube without functional: 20 mpa or less;Velocity-equalizing tube can be put forward: 10 mpa or less;

5, fluid temperature: 450 ℃ or less;

6, medium viscosity: 30 or less cp (crude oil);

7, material: velocity-equalizing tube, three groups: a variety of grades of stainless steel (optional);The main pipe, flange, stainless steel or carbon steel (optional).

Six, strength and the advantages of the flow sensor (compared with the orifice)

Strength 1, high accuracy, good stability and accuracy of plus or minus 1%, stability is plus or minus 0.1%, it can keep very stable output differential pressure signal for a long time, to ensure that the output differential pressure signal and pipeline flow mapping relationship.This is because in the process of use wear, corrosion and adhesion of oil dirt on pig the flowmeter coefficient of influence is not big, but these factors make the orifice discharge coefficient increases, and will rise to more than 20%, the error produced by this will reach more than 20%.We can find that strength and accuracy is stable for a long time.

2, reasonable design, easy installation, economy, strong and light weight, easy installation and disassembly, without lifting tool, the series of products are can be measured, the pipe does not block the install or remove without stop, due to the pig and light weight, easy installation and disassembly, so this can save you considerable cost of installation.For example: in the 200 mm diameter pipe installed on the flowmeter, powerful, weld only a 150 mm long, and the orifice has 2, a total of 1200 mm long long weld.In terms of working hours, install only need 1.5 hours, while installing an orifice plate to 12 hours.

3, is advantageous to the piping layout, and powerful, not only suitable for round pipe, also applies to any depth rectangular pipeline and buried under the ground.Strength and the length of the straight pipe upstream and downstream demand was much lower than the orifice plate, when the installation is behind the elbow distance 2 times the pipe diameter, still can get a stable, high accuracy, it is pig's unique advantages, to pipe especially large diameter pipeline layout design brings a lot of flexibility, save the cost.

4, small pressure loss, energy loss, * the pressure loss is less power loss, * the pressure loss of just 2-15% of differential pressure, while general orifice * loss to account for 40 to 80% of the differential pressure, to see the strength of the pressure loss of the * pressure loss is much smaller than orifice plate, with the increase of pipe diameter, pressure loss of the mighty, * negligible.For example: use on the pipe with a diameter of 1000 mm, the energy loss in the year only a few hundred dollars, when using orifice plate, energy losses as high as 20000 yuan a year, it is for today to try to save energy have opinions.

Seven, powerful and flow sensor and maintenance:

The preparing work before put into operation:

1, sensors installed correctly:

Complete sensors installed in the line, must carefully check before put into operation, require welding is firm, in the right direction, not leak, strictly proper insertion depth, etc.

2, instrument calibration:

Sensor matching instrument differential pressure transmitter and intelligent flow integrating instrument (there could be pressure transmitter and temperature transmitter), etc.Must be after inspection and calibration, can be put into use.The instrument measuring range to conform to the requirements of the sensors and the measured medium.Such as measured zui large air flow Qmax = 5000 m3 / h, the calculation to calculate differential zui big value of sensor

Delta Pmax = 0.6 Kpa, the measuring range of differential pressure transmitter should be set-up of 0 ~ 0.6 Kpa, the corresponding output 4 ~ 20 madc current signal.For universal, flow totalizer.especially should according to the real-time flow range, differential pressure range, medium density, temperature, pressure, flow operation requirements, etc., prior programming configuration, input totalizer.especially can correct operation and make sure totalizer.especially display traffic.

3, instrument wiring correct:

Sensor and differential pressure transmitter, flow integrating instrument of measuring system, such as supporting the power cord, signal output to the input line between instrument, control and alarm, etc., in various instrument wiring board (also known as terminal board) are clearly marked, is must confirm and don't choose to use, before the operation of the instrument connection to check again and again.In order to do the preparing work before put into operation, in addition to read the instruction for use, you should also read the differential pressure transmitter operation instruction handbook ", "operation instruction handbook" intelligent flow totalizer.especially etc, comply with the instruction manual for the guidance of work.

Eight, the flowmeter operation of work:

1, the measurement system is closed:

Operation of preparatory work has been completed, the medium to be measured with flow process piping, sensor measuring system is temporarily closed, then should make three balancing valve is fully open valve group, high pressure valve P l P2 and low pressure valve closed.Meter is in a state of power supply, preheating about 15 minutes.

2, open measurement systems:

Instrument after preheating, open measurement system.Open the Pl on three valve group and P2 valves, balance valve is still in the open.At this time, the differential pressure transmitter has filling the measured medium (gas or liquid), open the drain valve on the transmitter, quickly closed after discharge dirty liquid or gas.Then close three the balance valve on the valve group, transmitter that is entered into a state of differential pressure measurement.Output and the corresponding signal current differential delta P I delta P from the signal current value (m A) to calculate the pressure delta P values (KP) A.Also flow totalizer.especially into work state, show the measured medium flow.

If the above work all goes well, the flow meter works well, commissioning work is complete, delivery production use.

Nine, strength the blockage of flow sensor design.

Powerful the unique design of traffic probes thoroughly get rid of the pig and past several average probe easily blocked, the characteristics of accuracy is not high, make a source of measurement accuracy, repeatability and reliability to a new height.

Just when switched on, the fluid in the pipeline under the action of static pressure, into the pipe bending, quickly formed a pressure balance state.When pressure balance formation fluid in high pressure pipe inlet, detour, no longer into the bend.

Strength, high flow sensor, low take pressure hole held in nature

In general, dust, sand and particles under the action of the vortex street force, concentrated in the very back of the probe.This is why the autumn leaves are always in the leeward behind the house.Probe flowmeter probe held in unique design, coupled with the nature of gravity whereabouts, prevents the particles into, this design essentially prevent the congestion and can create a very stable low voltage signal.

Continuous work of fundamentally put an end to the possibility of the wall, but in the following cases, still should pay attention to prevent:

1, when the pressure pipe leaking, probe high pressure balance to destruction of impurities in the diameter of the smaller particles are likely to enter the hole.

2, when the pipeline was shut down, because of the brown movement of molecules, small particles of impurities may enter the hole.

3, and frequent system key, formed in high, small particles of impurities may enter the hole, accumulate over a long period, it is possible to probe the jam.

4, medium contains a large number of biological species, or containing fibrous material, may also cause the probe of the jam.

Ten, form a complete set of scheme selection:

1, ZW - 3051/1151 dp series differential pressure transmitter or other types of differential pressure transmitter;

2, ZW - 308 series pressure transmitter or other type of pressure transmitter;

3, temperature transmitter, or other type of temperature transmitter;

4, ZW - XMJA series or other types of flow totalizer.especially flow integrating instrument;

5, composed of intelligent velocity-equalizing tube flowmeter, pressure compensation can take temperature, and can show the instantaneous flow and cumulative flow medium medium temperature, the pipe, the pipe pressure and differential pressure equivalent, equipped with communication interface and 4 ~ 20 ma output.

Eleven, equipment complete set:

1, velocity-equalizing tube flow sensor 1;

1 2, velocity-equalizing tube flow sensor operating instructions;

3, 1 certificate;

4, form a complete set of transmitter instrument and manual and certificate of approval (which can be ordered by the users themselves).

12, product maintenance:

Sensors should be performed in the process piping overhaul of regular cleaning, there are a number of ways for cleaning, such as air blow test tube accumulated filth;Scrub with kerosene and soft silk net, make each hole to maintain patency.May produce the cause of the failure and remove methods: serial number of failure causes clear way.

1, differential pressure signal output: high and low pressure valve is not open, open the high and low pressure valve.

2, high and low pressure balance valves did not tighten, tighten balance valve.

3, differential pressure signal output is too small, pressure system has a leak phenomenon;Seriously looking for, eliminate the leakage.

4, improper secondary table range selection: uninteresting facts limit pressure transmitter.

5, differential pressure signal output is too large, secondary table range matching is undeserved, augmenting the upper limit, differential pressure transmitter back-pressure aperture jams, cleaning velocity-equalizing tube, eliminate congestion.

13, the use of notice:

1, the current body shall be full of pipe flow and stability.

2, the fluid being measured should be single phase, the phase constant, the composition of complex fluid must be similar to a single component of fluid can be used.

3, the current body under actual conditions of ReD should be greater than 3 x 104.

4, should guarantee the sensor before and after the straight pipe length requirements.

5, pipe diameter greater than 100 ㎜ as well.

6, 2 d in front of the sensor on the surface of the pipe, should be clean and smooth.

14, selection of coding:

Model tag method: ZW - QLB - DN - average power flow sensor

DN - - nominal diameter (mm) DN500, for example, for the nominal diameter 500 mm.

15, design selection and order notes:

1, the name of the measured medium;

2, the biggest, commonly used, flow range (m3 / h);

3, work pressure (Mpa), temperature (℃), the maximum pressure (Mpa), upper and lower temperature (℃);

4, medium density, viscosity,

5, pipe material, inner diameter, outside diameter;

6, the pipe laying and local resistance.

7, you need to display instrument of the measurement and control of form a complete set, please refer to the corresponding specifications, choose the right model or the information provided by our company technical personnel according to your designs for you selection.

8, if you have special want to, please contact our sales department.

After-sales service commitment:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understand the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.