The throttle device installation instructions - SIKE measurement and control (3)
The main characteristic of equilibrium flow meter
1, the measuring accuracy is 5 ~ 10 times of the standard orifice plate
2, is 1/15 of the standard orifice flow noise
3, permanent pressure loss is a third of the standard orifice plate
4, the pressure recovery 2 times faster than the standard orifice plate
5, straight pipe can be less than 0.5 D
High linearity, repeatability is good
Equilibrium flow sensor are symmetric porous structure, able to balance the flow field, reduce the eddy current, vibration and noise signal, the flow field greatly improve the stability and the linearity than the standard orifice plate increased 5 ~ 10 times, repetitive increased by 54%, to 0.15%, from the point of its comprehensive performance, balance meter belongs to high-grade flowmeter.
5-1 range than the linearity of plus or minus 0.3%;
7:1 range than the linearity of plus or minus 0.5%;
10:1 range than the linearity of plus or minus 1.0%
The straight pipe required is low
Equilibrium flow sensor due to the stable flow field and pressure recovery two times faster than standard orifice, greatly reducing the requirement for straight pipe. Straight pipe before and after the general for the first 3 D after 1 D, can be less than 0.5 D, so as to save a lot of straight pipe, especially special expensive materials of pipes.
Reduce the permanent pressure loss
Porous symmetrical balance design, reduces the turbulent shear stress and the formation of eddy current, reduce the loss of kinetic energy in the same measurement conditions, compared with the standard orifice plate reduces the two-thirds of the permanent pressure loss, saving considerable energy cost, operation is a kind of energy-saving instrument, worth of promotion.
Resistance to dirt not easily blocked
Porous symmetrical balance design, reduces the turbulent shear stress and the formation of eddy current, thus greatly reduces the stranded dead zones, ensure pore smudgy smooth through multiple media and reduce the chance of a fluid hole blocked.
Can directly replace orifice
With the orifice plate with the same method of use and appearance, so you can directly to replace, do not need any piping changes and changes of related instrument, very suitable for the energy measurement transformation in orifice flowmeter to balance.
Wide range of flow measurement
According to the experimental results, we know that: balance the performance of the flowmeter, the flow velocity can be from the least to the speed of sound; The smallest Reynolds number can be less than 200, the biggest Reynolds number greater than 10000000; Beta optional 0.25 ~ 0.90.
Long-term stability is good
Because of its obvious turbulent shear stress decreases, and greatly reduces the friction between the throttling parts directly, its beta remain unchanged for a long time, the whole instrument have no moving parts, so can maintain stability for a long time.
High temperature and high pressure medium can be obtained
With orifice throttling device, such as work depends on the temperature and pressure piping and flange material and grade, working temperature is 750 ℃, pressure can be up to 32 mpa.
Measurable complex working condition of medium
Because of its special structural design, make its have special performance, it can undertake gas-liquid two phase, a variety of mixed gases (such as gas, methane gas, coal gas, etc.), all kinds of low temperature gas (such as liquid nitrogen, liquid oxygen, liquid argon, liquid, liquid chlorine, liquefied ethylene, liquefied petroleum gas, etc.), gas liquid two phase medium, such as moisture, pulp, multiphase flow, vibration, electromagnetic interference and two-way flow of medium flow (because balance meter or so completely symmetric).
The main technical parameters:
Take pressure method: Angle joint pressure, flange pressure and diameter of pressure
Nominal pressure: 32 mpa or less (20 mpa with high pressure welded or higher)
Nominal size: 50 ~ 1000 mm
Precision (uncertainty) : plus or minus 0.3% ~ 1.5%
Scope of application: open hole diameter than beta: 0.2 beta 0.8 or less or less
Reynolds number range ReD: 107 ReD and ReD 170 or 5000 or higher or more beta 2 d;
Main structure form
Flange clamp The integration of type
With a short tube welded
8, the integration of the throttling device
Integration of throttling device is before delivery by flow meter manufacturers in accordance with the requirements of the users and cut-off valve throttle device, the condenser (or condensing coil) pressure tube and three valve group and differential pressure transmitter assembly together. Arrival of the goods only to the flange and pipe welding and connected to the differential pressure transducer cable can be put into use.
Integrated throttle device in recent years due to the great place to show the user and was welcomed by the market, produced a number of different structure, and the limit of the space will only our company designs and manufactures one of the integration of the throttle device structure and the schematic drawing attached, as shown in figure 5.
9, supply of complete sets of sex and ordering information
1, supply of complete sets of sex
The company in addition to the production of various kinds of standard and non-standard throttling devices, also produces or another for differential pressure flowmeter of other instruments, devices and accessories, such as various types of normal and intelligent differential pressure change into, regular and zone temperature pressure compensation, various types of intelligent flow totalizer.especially cut-off valve, valve group and condenser, three isolated containers and so on all kinds of accessories, complete a whole can be in our company, very convenient and implement three guarantees.
2, the order information
Must be complete and correctly fill out the throttle device consulting list or specify the following items:
The name of and order the throttle device and take pressure
The name of the measured medium (fluid)
Pipe diameter and pipe size (diameter x wall thickness)
Types of piping material and surface condition (condition)
For the throttle device flange, ring chamber and gasket material
The throttling parts material (if not specified, then use 1 cr18ni9ti)
Traffic and unit
Scale (cap) traffic: maximum flow Q: Qmax are commonly used traffic: end flow: Qmin
Unit: used for liquid m3 / h; Or t/h; Or kg/h.
For steam: t/h; Or kg/h.
Used for gas: Nm3 / h: (standard conditions: 0 ℃ 101. 325 KPa)
Or N m3 / h. (20 ℃ standard conditions: 101. 325 kpa)
Or m3 / h; (work)
(note: N m3 / h - standard cubic meters per hour)
Figure 5 integrated throttle device structure diagram
Operation (work) pressure: MPa (must indicate "table" pressure or "absolute").
(note: if there are fluctuations must give common values calculated using value, otherwise will average calculation.)
Operation (work) temperature: ℃ (note: if there are fluctuations must give common values calculated value, otherwise will average calculation.)
Medium density: kg/m3
Note 1: must indicate is under the standard condition or conditions)
(note 2: the commonly used liquid, air, gas, steam can be omitted, but if for the mixed gases, you must give the name and account for volume percentage of the component.)
Dynamic viscosity of medium: mPa s.
(note: same as above note: 2)
Scale (cap) differential pressure delta P: kPa (if no request, by the company)
(note: this value and corresponding calibration flow, the differential pressure, differential pressure transmitter will output 20 ma current; should be put into scale flow and flow totalizer.especially values.)
The throttle device installation location or the local atmospheric pressure kPa.
Allow the pressure loss: kPa.
The accessories, spare parts and complete sets of supply demand and so on.
Warns the user
1, and they are widely used because of the throttle device specific process conditions is not only different but also may change frequently, so users will encounter all sorts of difficult to analyze and interpret in operating problems, which the company has a flow meter, a senior expert on can provide consulting services for users. In the field can also be involved in analysis, put forward the solution to solve the problem and the personnel training for users. I believe respect user will get comprehensive and satisfactory service in our company.
2, for the user to install and use the throttle device correctly, suggest the user to read and reference: jian-zhong wang, Sun Huaiqing compiled "flow measuring throttle device design manual" chemical industry press, March 2000
The throttle device advisory single order
Ordering Unit | Corraddress |
Rep | Tel |
Date | Fax |
Name of Instrument | Model |
Quantity | Up limit value for chosen pres diff meter |
Measured medium | Average atmospheric pres (using region) |
Scale | Relative humidity |
Max flow m3/h (0℃,101.325kPa;20℃,101.325kPa, | pipe bore(Outside diameter×Wall thickn.) |
kg/h t/h m3/h Norm flow m3/h (0℃, 101.325kPa | Medium component Volumetric percentage |
Min flow m3/h (0℃, 101.325kPa;20℃,101.325kPa | Varieties of the throttling device |
Pres indicated by work meter | Material of the throttle |
Working temp ℃ | Material and the condition of the pipe |
Measured medium density (work state) | Mounting position of the pipe |
Measured medium viscosity (work state) | Pres loss |
Isentropic exponent under workg state | Name of the attachment required |
Points for attention in filling in the form: 1.This consultative form and the contract together shall be regarded as the basis of order, which must be written clearly, furthermore they’ll be invalid if altered. 2.The flow state must be filled in while the gas flow is measured: m3/h (0℃, 101.325kPa, 20℃,101.325kPa,working state) |