Some standard content:
National Metrology Technical Specification of the People's Republic of China JJF1004—2004
Metrological Terms and Their Definitions fur Flor Rute2004-09-21 Issued
2005-03-21 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJE1004—24H4
Metroloetcal Terms and Definitions for Flow Ratio
LJF 1004—2(K4
Replaces JJG 14—86
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 21, 2004, and will be implemented on March 21, 2005.
Responsible unit: National Water Resources and Hydropower Engineering Technical Committee Drafting unit: National Water Resources and Hydropower Engineering Research Institute, National Water Resources and Hydropower Engineering Metering Station
This specification is entrusted to Shandan for interpretation
Main drafters of this specification:
Duan Huiming
Zhai Xiuzhen
Ten Self-sufficiency Departments
Participating drafters:
JJF 1004—204
(National Institute of Metrology)
【National Institute of Metrology】
(National Water Large Flow Metering Station)
(China Institute of Metrology)
"General Terms
1.1 Flow rate
1.2 Throttling (pipe flow, duct low)1.3 Open chanel thow1.4 Flowmeter
JJF L004—2004
1.5 Flowmeter error characteristic curve[emorprHomank: rve of flow mcur1.6 Measuring tube (meter lube)
1. Primary device
Secondary device
1.4 Output signal (output signal) signal）1.10
Calibration factor of the primary flow rate (Calibration Factor of the primary flow rate) Maximum flow rate (maximum flow rate) Minimum flow rate (minumow-rate)
Filling range (ow-ratemnge)
Transilional flow rate (Transilional flow rate) Nominal flow rate (mominal flow rate) Full scale flow rate (full scale flow rate) Pressure loss (Pressure loss)
Working conditions (Warking conditions)
Working temperature [Working temperature] Working pressure (Orking pressure)
Installation conditions (Instullation condition) Straight pipe service (Traight tube)
Wall pressure tapping hole (Wall (Pressure) tapping hole (Rain hules)
Exhaust hole (l hol)
swirling flow
pulsating flow with constant average flow (mulxalung rw of mea conatanl low -rale)turhilentnw
laminar flow (daminHr flow)
steady flow (5teHdmw)
unsteady flow (unsteadyrw)
multiphase flow (multipharetlaw)
critical flow (cnitirul Ilow）
velocity distribution (1)
（2）
JJF1004
135Fully developed velocity distribution Falydrelopelelor:itdiatrihulion1.36
Regularwirldislnbntirn1.3
Flowability mi(flow pmile
mean auxiliary flow velocity (mean[milvetority])hydruuli cliamerer;
hydraulic radius (hdriuirarlius])
static Jk(stulie μessurs)
absolute pressure thknlule sulicpeeasue of the mid)gauge presblre
dynamic Jk(hyum: prHsue)
Total (tll pressure)
Slug lH (slugnulion pressu)
Frau number (Frnule: nurbur)
Rpruld uuer
Muhurnber
Structured year number (tnll)
Specific heat ratio (utiu ul kriliu luel cupanitie? Equivalent quotient index (ist:nropi:xpulnt) Shrinkage four (Lompreseibiily futur) Attachment effect (ue
Dopp effect (oplrrx:)
Water (.gaug)
Riverbed slope (s:d glapr:;Ixotlur alup) water surface gradient (u)
fall (fall)
water level (stag:: ghugehusight: liauid kel)) water level first-class system (stage- disuharg: iclutires) level point (br: h)
1.63 well logging (gangc wel). stiling well) 1.64 head (hend)
2 measuring instruments and Lida
2.1 old pressure flow meter [differentrntialpressur: Flawmcter] 2.2 flow lift meter (aminarIlawmrtrr) 2.3 critical flow disc meter criticaltlewmeter? 2.4 current band if [electromagmetic 2.5 Full wheel flow meter (lurbine flow meter) 2.6 Full street flow meter (vartexshedding low meter) 2.7 Inlet (rtexprectssion flow meter) 3
JJF E004—2004
2.8 Ultrasonic flow meter (ullar flow meter) 2.9 Volumetric flow meter (ullu flow meter) 2.10 Mass flow meter (mullu flow meter) 2.11
2.12 Water meter (r: )
Next I gas meter (aster)
heat energy meter (hratmcters)
fuel dispenser (fucldispenserg) 2.16
gas dispenser (shengdispengcra)
velocity-area method (velocity-areamethoca) 2.18
tracermethods
2.19weirflumemethod 3 flow standard device
3.1 liquid flow standard device (liquidowstandardearililie) 32 gas flow standard device (gasHlowzanlardfanililie) 3.3 volume flow standard device)
3.4 Standard meter method (maetermeter method) 4-character code ··
Appendix A
Text citation
English index!
(7)
General terms
1 Flow (ow)
JIF HN4—2H4
Terms and definitions of flow measurement
The flow of fluid through the fixed drum surface is called the flow meter. The flow record and the accumulated flow are called the flow meter. The flow into the fixed drum surface in a period of time is called the cumulative flow, also known as the total flow. When the flow rate is very short and the flow surface is fixed, it is called instantaneous flow. If there is no misunderstanding, instantaneous flow can also be referred to as flow. When the flow is expressed in volume, it is called flow rate. When it is expressed in mass, it is called mass flow: 1.2 Flow (pipie tlmw, sluert flnw) Fluid flows in pipes
1.3 Channel flow (open channel)
The flow of a body with a white liquid surface in an open channel. 1.4 Flowmeter (own flowmeter)
It measures flow. It usually consists of a primary device and a secondary device. It has good sensitivity and can be used to compare the flowmeter with the standard flowmeter. 1.5 Flowmeter error characteristic function (emornerfnmanrsr: ruinenfflnwmmer) It shows the relationship between the flowmeter flow rate and the error, and is a function of the measured value and other factors that affect the measurement error. 1.6 Measuring pipe (mrler.Lube)
A specially treated section of pipe that meets the technical requirements of the standard in all aspects and contains a flow measuring device.
1.7 Primary device (primary da:vier) A device that generates a flow signal. According to the principle adopted, the primary device can be used inside or outside the pipeline to generate electricity in each building. The primary device includes a sample: measuring device, the electricity produced by the flow meter is purchased by the manufacturer, and the pressure meter is equipped with a speed control device and a pressure measuring device. For the flow meter, the primary device is fully reduced and replaced by the device, 1 primary device [sfrmrdary dnvice] receives the signal from the primary device and displays, records, transfers (or) transmits the signal to the device to obtain the flow disk,
1.9 input signal (aulgul sigtl)
is the input signal of the secondary device. This signal is the number of flow exhaustion. 1.10 Calibration factor of primary device (r:ilatian Farlur of hr:prinnary device? The quotient of the flow rate under specified conditions and the corresponding signal value emitted by the primary device: I.1E Maximum flow rate (maximun ilow-rate? The maximum flow rate that meets the performance requirements. 1.12 Minimum flow rate ± (minimum flw-1ata, the minimum flow rate that meets the metrological performance requirements
1. Flow range (Hawnile:Tange)
JJF 1004--2004
The range defined by the flow rate and the minimum flow rate within which the metrological performance requirements are met. 1.14 Transitional flow-rale The flow rate between the maximum flow rate and the minimum flow rate divides the entire device into two areas, namely "high area" and "low area"
1.15 Nominal flow (nnminal Ilow-Mte) Under nominal flow, the cross-base meter should be able to fully meet the meter performance requirements in both reliable operation and question operation. Jiang: Liu table, the full capacity of the public is called the point source, 1.16 full-scale flow rate (fullscaleflow-rate) to the maximum filter signal flow
1.1 pressure loss (pressureloss)
due to the pipeline in the car once the irreparable pressure drop caused by the pipe. [, I% 1. Working conditions (working cunclinions) The characteristic value of the physical property of the measured fluid that falls through the device and meets the specifications of the primary device. 1.19 Upper temperature (wurkinglepceruluue) The temperature of the measured fluid that passes through the primary device and meets the specifications of the primary device. [.20T working force (wkirgprcssure) The flowmeter is installed once and meets the absolute value of the measured fluid of the primary device. 1.21 Installation conditions (installatinncondition) The physical environment in which the flowmeter is allowed to be used (flowmeter installation notice): Note: The physical environment is not only the external soft parts, but also the flow method, the flow nature of the rational effect, the failure and the long push matching time maintenance.
1.22 Pipe section (etraighilengh)
A pipe section installed in the flow meter 1 group and downstream to achieve a certain flow field: its axis is straight and the area and shape of the internal cross section remain unchanged. The surface shape is usually red or rectangular, or it can be annular or any other regular shape:
1.2 Pipeline pressure tapping hole_wall【pressure】tapning]] Graphic hole on the pipe wall, its edge is flush with the inner wall of the pipe: the most common hole is used to measure the static music of the fluid in the pipeline. 1.24 Drain hole (druinhules)
Holes used to discharge undesirable solid particles or fluids with a density higher than that of the object in the pipe: 1.25 Exhaust (vcnt hole)
Used to discharge undesirable gases in the pipe: 1.26 Vortex flow (awirling flow)
Flow with a speed control function.
1.27 Pulsation of mean flow: The average value of a flow measured over a long enough time interval. When averaged over a long enough time interval, the flow has a constant average value.
: The flow has the following disadvantages: 2.28 (turhalent flow)
J.IF1004—2004
Compared with the turbulent flow, the inertia force plays a more important role in the flow. Note: The turbulent flow is the flow with irregular fluctuations in time and space. 1.29 Minrow: The flow with the inertia force and the viscosity force play a more important role in the flow. Note: stratification is the flow of the fluid after the flow is affected by the flow and the flow is also affected by the flow. 1.30 Steady flow (steuluw)
velocity, pressure and density are basically unchanged with time, and the flow that affects the measurement accuracy is also called constant flow: Note: The measured flow is actually the normal flow, which has a small difference with the standard value. It is the requirement of the fixed flow when the time is high. ".3】 Unsteady flow (unstcad: Mow) is the flow in which one or more of the velocity, pressure, density and temperature change passively with time, also known as constant flow. Note: The time of learning is the same as that of the two phases, so as to learn the randomness of the flow. 1.32 Multiphase flow (mullipbtis nw)
Two or more different phases of fluid flow together. Only when two phases of fluid flow together is it called two-phase flow: 1.33 Critical flow (eritical flow)
Fluid flows through the throttling device. The ratio of the absolute pressure below and above the upper reaches is small. The flow is a critical flow: When the state of the fluid (pressure, temperature and velocity distribution) remains unchanged, the mass flow rate remains constant. 1.34 Velocity distribution (velor:i1ylistrilmitinn) The distribution of the fluid flow in the cross section of the pipe. 1. Fully developed thickness distribution (fshanyrevelnparvelociistnbutinn) During the flow process, there is a velocity distribution along the flow that does not change from one cross section to another. It is usually formed at the end of a sufficiently straight pipe. 1.36 Regular velocity distribution (RCG) is a close approximation of the fully developed velocity distribution and allows accurate sparse measurements. 137 Flow surface (Flowprafile)
Graphical representation of the flow distribution.
138 Mean axial fluid velocity (mean axial velocity) (mean axial velocity of the local flow velocity) divided by the cross-sectional area 1.39 Hydraulic diameter (hydraulic diameter)
The quotient of the cross-sectional area of the four bottom and the same length. For full flow, the diameter is equal to the internal diameter. 1.4 [Hydraulic radius (hyeralic radin) is equal to the quotient of the wet area and the base circumference 1.4] Statir: [u]
The pressure value measured in a fluid without the influence of flow velocity. 1.42 Fluid relative pressure (abeolute laliv [Meer: of he fluid3
JJIF104—2H4
Mark at the point of full filling of the well layer of the secretion: 1.43 Table (gdig (im5su)
The value of the static force of the body and the atmospheric positive force at the same time at the dating location, 1a Baoyamitpessurc
14] Body dynamic pressure (duatpreauluidement For a single flow in a pipe, the energy of the fluid is fully converted into pressure and can produce a force higher than the pressure. The body cannot be compressed, and the single dynamic pressure of the fluid is -
Over: The first class of other missing number between the meaning of the discussion 1, the same as below, 1.44.2 regret to start the surface → meandynamicieressurcinacroas-section in the form of kinetic energy through the dream surface of the flow of the ratio of the volume flow rate, for ten can not Le contraction flow, the cross-plane single average dynamic pressure is
1.45 total (tetl rpsuri
pressure and pressure and
: for, the stop point soldiers have very different teaching i.46 li-乐[alagnation orssaure: the expression of the energy of the forest kinetic energy is converted into the energy of the state of feeling. Its beauty is equal to the absolute happiness and the sum of the previous life
Note: on the rate of flow, the joy and the pressure of the joy of stopping may be effective. 4? Fangde number (Frnteda: uinber
flat speed average said and more increase the degree of the machine to eliminate the flat, 1.48 South number [Reynalalurrbr)
Fr=(g)
expression of the heart mother control effect of the force and the dynamic, Reut
: out or sound reduction effect, the patient specifies one person 1 effect case adjustment within the same length of the ruler (the management of the hospital, the special license group one on the long mutual, the same effect must be huge
1.4 Ma Mao number uac:h nuanber
Under the temperature and after the condition under consideration, the ratio of the average axial velocity of the flow reservoir to the velocity of sound in the flow is: Ma=
1 New Rolls number (alm
The characteristic of the material in the scale is that the high frequency and the flow path are not related to the system parameter
JJF10D4—2004
51 Specific heat ratio (atioof apecifie herat curmilies) is the ratio of the specific heat capacity to the specific heat capacity of the fixed wear. 1.52 Isenropic index (isenropic =Expunent The ratio of the relative change in pressure to the relative change in density under conditions of fundamental reversibility (e.g., exponent) of ideal gas, ratio of specific heats, which is considered constant within the chosen integration range.
1.53 Reduction factor due to the inconsistency of the real gas law with the ideal gas law under constant pressure and pressure. oRT
5-: ratio for the ideal gas band, 3.3143 Jmo)-K1.1.54 Coanda effect
The mechanical effect produced when a fluid adheres to a solid surface close to it. 1.55 Doppler effect The apparent change in the frequency of radiation due to the relative motion between a primary source or a primary source and an observer. 1.56 Water gauge (guuge)
A device installed at a hydrological station to measure the surface level of a liquid relative to a reference surface. 1.57 Bed slope (la:lalape:botwomslyprc) The height difference of each horizontal run from the riverbed measured in the direction of flow. 1.58 Water surface gradient (ufaceloe)
The difference in water surface height per unit horizontal distance measured in the direction of flow: 1.59 Head (E)
The height of the water surface between the two ends of a given river section at a given time. 1.r water level The height of a river, lake or reservoir relative to a given base. 1.61 Level-discharge relationship The relationship between water level and discharge for a given cross section in an open channel under stable conditions of rising or falling water level. It may be expressed by a line, formula or scale. 1.62 Benchmark A permanent mark of a standard. Its height should be related to the national benchmark as far as possible. I.6 Gauges Well, Stilling Well) is a kind of building connected to the riverbed and used to measure the liquid level of a relatively static river. 1.64 Head (head)
J3F10042004
Drainage is the height of the water flow surface on the double reference surface, and the height of the water flow at the speed cabinet at the reference surface. 2.1 Differential pressure flow meter (differential pressure flow meter) is a flow meter that measures flow based on the differential pressure principle. It consists of a throttling device (or differential pressure flow sensor) and a differential pressure gauge (or differential pressure transmitter and display instrument). 2.1: Throttling device (thrntle devicra) is a device installed in a pipeline to generate pressure, measure this differential pressure, and calculate the pressure difference based on the known fluid state, device geometry and pipe geometry. Note: The standard is the sound source device B/F2624. 2.1.2 Orifice (orifice) Throat (thrkal) The smallest opening in the cross section of the throttling device: Note: For orifices and effective holes, it is only applicable. 2.13 Diameter ratio (diameter ratio) The ratio of the diameter of the throttling orifice (or throat) to the inner diameter of the upstream pipe. Note: This article is used for installation, 2.1.4 Pressure Lapping: pressure taps 2. 1.4.1 Angular connection (ratio) Tapping is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate (or nozzle). The distance between the most positive hole axis and the corresponding end of the orifice plate or nozzle is equal to half of the diameter of the pressure hole itself. The pressure hole penetrates the orifice and is flush with the blood of the orifice.
2.1.4.2 Flange pressure hole (lluge pressaire tapping) is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate. The axis is 25.4mm from the upstream end face and downstream end face of the orifice plate respectively.
2.1.4.3 Venetian pressure hole (vena contrar:lprseur:lupping) is a pair or several pairs of holes drilled on the two sides of the orifice plate. The upstream pressure hole is located at a distance of 1 (the inner diameter of the pipe) from the upstream end face of the orifice plate, while the downstream pressure hole is on the cross section of the minimum static pressure. Because it is located downstream of the orifice plate, the distance from the upstream end of the orifice plate varies with the diameter. 2.11.4/2 Pressure holes (1 and/2 Frerepping) A pair or several pairs of pressure holes drilled in the pipe wall on both sides of the orifice plate. The working pressure hole and the downstream pressure hole are located at the upper end of the orifice and 1P and 0.5D respectively.
2.1.5 Piezualeler nng connects two or more pressure holes on the same cross section to form a pressure balance cavity. The cold ring is used to form an integral part of the warning or downstream in addition to the speed reduction device. 2.1. Ring chamber (nnmlarhambrr)
An equalizing ring that is integrated with the throttling device and flange 2.1.7 Corrierrirg46 li-music [alagnation orssaure: table evidence flow forest kinetic energy metal part into force energy to the state of feeling pressure. Its pretty equal absolute happiness and previous life and
Note: on the rate of flow, music and stop pressure music may be effective. 4? Fangde number (Frnteda: uinber
flat added speed average said and more increase the degree of machine flat root elimination, 1.48 South number [Reynalalurrbr)
Fr=(g)
table Er through sex force and dynamic with the heart mother control effect, Reut
: out or sound reduction effect plan, the patient specifies one person 1 effect case adjustment within the same long ruler dry (the management hospital side, the special license table group one on the long mutual, the same effect must be huge
1.4 Ma Mao number uac:h nuanber
Under the temperature and after the condition under consideration, the ratio of the average axial velocity of the flow reservoir to the velocity of sound in the flow is: Ma=
1 New Rolls number (alm
The characteristic of the material in the scale is that the high frequency and the flow path are not related to the system parameter
JJF10D4—2004
51 Specific heat ratio (atioof apecifie herat curmilies) is the ratio of the specific heat capacity to the specific heat capacity of the fixed wear. 1.52 Isenropic index (isenropic expunent) The ratio of the relative change in pressure to the relative change in density under the conditions of basic reversible change (such as expunent) exchange, Liu 1 Ideal gas, the ratio of specific heats, such as the heat index, this ratio is considered to be constant within the selected integration range.
1.53 Reduction factor (onpresaihilitfar:u) Correction factor for the inconsistency between the real gas and the ideal gas law under certain pressure and pressure. oRT
5-: The ratio is the gas band micro, which is 3.3143Jmo)-K1.1.54 Helferr effect
The mechanical effect produced when a fluid adheres to a solid surface close to it, 1.55 Doppler effect (1on 1.56 Water gauge (guuge)
A device installed at a hydrological station to measure the level of a liquid surface relative to a reference surface. 1.57 Bed slope (la:lalape:botwomslyprc) The height difference of each horizontal run from the riverbed measured in the direction of flow. 1.58 Water surface gradient (ufaceloe)
The difference in water surface height per unit horizontal distance measured between the flow direction: 1.59 Head (E)
The height of the water surface between the two ends of a given river section at a given time. 1.r Water level (atagp) gaigr: heightl:linrid level The height of a river, lake or reservoir relative to a given base. 1.61 Level-discharge relationship (gaugr:discharge:harg:renliure) The relationship between water level and discharge in an open channel under stable conditions of rising or falling water level over a given cross section. It can be expressed by a line, formula or scale. 1.62 Benchmark A permanent mark of a standard of elevation. Its height should be related to the national benchmark as far as possible. I.6 Gaugers well, stilling Well) is a kind of building that is connected to the air and the river, used to measure the liquid level height of a relatively static river. 1.64 Head (head)
J3F10042004
Water well measures the height of the water flow surface on the double reference surface, and the height of the water flow at the speed cabinet at the reference surface. 2.1 Differential pressure flowmeter (differential pressure flowmeter) is a flowmeter that measures flow based on the differential pressure principle, consisting of a throttling device (or differential pressure flow sensor) and a differential pressure gauge (or differential pressure transmitter and display instrument). 2.1: Throttling device (thrntle devicra) is a device installed in a pipeline to generate pressure, measure this differential pressure, and calculate the amount of water based on the known fluid state, device geometry and pipe geometry. Note: The standard is selected from the sound source B/F2624. 2.1.2 Orifice (orifice) Throat (thrkal) The smallest opening in the cross section of the throttling device: Note: For orifices and effective orifices, this applies only. 2.13 Diameter ratio (umultratiu) The ratio of the diameter of the throttling hole (or throat) to the inner diameter of the upstream pipe. Note: This is used for installation. 2.1.4 Pressure Lapping: pressure taps 2. 1.4.1 Angular tapping (rarntr rrksure tapping) A pair or more of tapping holes on the two sides of the orifice plate (or nozzle). The distance between the most normal hole axis and the corresponding end of the orifice plate (or nozzle) is equal to half the diameter of the pressure hole itself. The pressure hole penetrates the hole and is flush with the blood of the orifice. 2.1.4.2 Flange pressure tapping hole (lluge pressaire Tapping is a pair or several pairs of pressure-taking holes drilled in the pipe wall on both sides of the orifice plate, and its axis is 25.4mm from the upstream end face and downstream end face of the orifice plate respectively. 2.1.4.3 Vesicular pressure-taking hole (vena contrar:lprseur:lupping) is a pair or several pairs of industrial holes drilled in the pipe wall on both sides of the orifice plate. The upstream pressure-taking hole is located at 1 (the inner diameter of the pipe) away from the upstream end face of the orifice plate: and the downstream pressure-taking hole is on the cross section of the minimum static pressure. Because it is located downstream of the orifice plate, the distance from the upstream end of the orifice plate varies with the diameter. 2.11.4/2 Frerepping is a pair or several pairs of pressure-taking holes drilled in the pipe wall on both sides of the orifice plate. The upstream pressure-taking hole and the downstream pressure-taking hole are located at 1P and 0.5D from the upstream end of the orifice plate respectively:
2.1.5 Piezualeler nng connects two or more pressure holes on the same cross section to form a pressure balance chamber. Science: Cold ring is used to reduce the speed of the cargo channel and is integrated with the warning or downstream. 2.1. Ring chamber (nnmlarhambrr)
Equalizing ring integrated with the throttling device and flange 2.1.7 Corrierrirg46 li-music [alagnation orssaure: table evidence flow forest kinetic energy metal part into force energy to the state of feeling pressure. Its pretty equal absolute happiness and previous life and
Note: on the rate of flow, music and stop pressure music may be effective. 4? Fangde number (Frnteda: uinber
flat added speed average said and more increase the degree of machine flat root elimination, 1.48 South number [Reynalalurrbr)
Fr=(g)
table Er through sex force and dynamic with the heart mother control effect, Reut Www.bzxZ.net
: out or sound reduction effect plan, the patient specifies one person 1 effect case adjustment within the same long ruler dry (the management hospital side, the special license table group one on the long mutual, the same effect must be huge
1.4 Ma Mao number uac:h nuanber
Under the temperature and after the condition under consideration, the ratio of the average axial velocity of the flow reservoir to the velocity of sound in the flow is: Ma=
1 New Rolls number (alm
The characteristic of the material in the scale is that the high frequency and the flow path are not related to the system parameter
JJF10D4—2004
51 Specific heat ratio (atioof apecifie herat curmilies) is the ratio of the specific heat capacity to the specific heat capacity of the fixed wear. 1.52 Isenropic index (isenropic expunent) The ratio of the relative change in pressure to the relative change in density under the conditions of basic reversible change (such as expunent) exchange, Liu 1 Ideal gas, the ratio of specific heats, such as the heat index, this ratio is considered to be constant within the selected integration range.
1.53 Reduction factor (onpresaihilitfar:u) Correction factor for the inconsistency between the real gas and the ideal gas law under certain pressure and pressure. oRT
5-: The ratio is the gas band micro, which is 3.3143Jmo)-K1.1.54 Helferr effect
The mechanical effect produced when a fluid adheres to a solid surface close to it, 1.55 Doppler effect (1on 1.56 Water gauge (guuge)
A device installed at a hydrological station to measure the level of a liquid surface relative to a reference surface. 1.57 Bed slope (la:lalape:botwomslyprc) The height difference of each horizontal run from the riverbed measured in the direction of flow. 1.58 Water surface gradient (ufaceloe)
The difference in water surface height per unit horizontal distance measured between the flow direction: 1.59 Head (E)
The height of the water surface between the two ends of a given river section at a given time. 1.r Water level (atagp) gaigr: heightl:linrid level The height of a river, lake or reservoir relative to a given base. 1.61 Level-discharge relationship (gaugr:discharge:harg:renliure) The relationship between water level and discharge in an open channel under stable conditions of rising or falling water level over a given cross section. It can be expressed by a line, formula or scale. 1.62 Benchmark A permanent mark of a standard of elevation. Its height should be related to the national benchmark as far as possible. I.6 Gaugers well, stilling Well) is a kind of building that is connected to the air and the river, used to measure the liquid level height of a relatively static river. 1.64 Head (head)
J3F10042004
Water well measures the height of the water flow surface on the double reference surface, and the height of the water flow at the speed cabinet at the reference surface. 2.1 Differential pressure flowmeter (differential pressure flowmeter) is a flowmeter that measures flow based on the differential pressure principle, consisting of a throttling device (or differential pressure flow sensor) and a differential pressure gauge (or differential pressure transmitter and display instrument). 2.1: Throttling device (thrntle devicra) is a device installed in a pipeline to generate pressure, measure this differential pressure, and calculate the amount of water based on the known fluid state, device geometry and pipe geometry. Note: The standard is selected from the sound source B/F2624. 2.1.2 Orifice (orifice) Throat (thrkal) The smallest opening in the cross section of the throttling device: Note: For orifices and effective orifices, this applies only. 2.13 Diameter ratio (umultratiu) The ratio of the diameter of the throttling hole (or throat) to the inner diameter of the upstream pipe. Note: This is used for installation. 2.1.4 Pressure Lapping: pressure taps 2. 1.4.1 Angular tapping (rarntr rrksure tapping) A pair or more of tapping holes on the two sides of the orifice plate (or nozzle). The distance between the most normal hole axis and the corresponding end of the orifice plate (or nozzle) is equal to half the diameter of the pressure hole itself. The pressure hole penetrates the hole and is flush with the blood of the orifice. 2.1.4.2 Flange pressure tapping hole (lluge pressaire Tapping is a pair or several pairs of pressure-taking holes drilled in the pipe wall on both sides of the orifice plate, and its axis is 25.4mm from the upstream end face and downstream end face of the orifice plate respectively. 2.1.4.3 Vesicular pressure-taking hole (vena contrar:lprseur:lupping) is a pair or several pairs of industrial holes drilled in the pipe wall on both sides of the orifice plate. The upstream pressure-taking hole is located at 1 (the inner diameter of the pipe) away from the upstream end face of the orifice plate: and the downstream pressure-taking hole is on the cross section of the minimum static pressure. Because it is located downstream of the orifice plate, the distance from the upstream end of the orifice plate varies with the diameter. 2.11.4/2 Frerepping is a pair or several pairs of pressure-taking holes drilled in the pipe wall on both sides of the orifice plate. The upstream pressure-taking hole and the downstream pressure-taking hole are located at 1P and 0.5D from the upstream end of the orifice plate respectively:
2.1.5 Piezualeler nng connects two or more pressure holes on the same cross section to form a pressure balance chamber. Science: Cold ring is used to reduce the speed of the cargo channel and is integrated with the warning or downstream. 2.1. Ring chamber (nnmlarhambrr)
Equalizing ring integrated with the throttling device and flange 2.1.7 Corrierrirg57 Bed slope (la:lalape:botwomslyprc) The height difference of each horizontal run from the riverbed measured in the flow direction. 1.58 Water surface gradient (ufaceloe)
The height difference of the water surface per unit horizontal distance measured in the flow direction: 1.59 Head (E)
The height of the water surface at both ends of a given river section in a given period of time. 1.r water level The height of a river, lake or reservoir relative to a given base. 1.61 Level-discharge relationship The relationship between water level and discharge for a given cross section in an open channel under stable conditions of rising or falling water level. It may be expressed by a line, formula or scale. 1.62 Benchmark A permanent mark of a standard. Its height should be related to the national benchmark as far as possible. I.6 Gauges Well, Stilling Well) is a kind of building connected to the riverbed and used to measure the liquid level of a relatively static river. 1.64 Head (head)
J3F10042004
Drainage is the height of the water flow surface on the double reference surface, and the height of the water flow at the speed cabinet at the reference surface. 2.1 Differential pressure flow meter (differential pressure flow meter) is a flow meter that measures flow based on the differential pressure principle. It consists of a throttling device (or differential pressure flow sensor) and a differential pressure gauge (or differential pressure transmitter and display instrument). 2.1: Throttling device (thrntle devicra) is a device installed in a pipeline to generate pressure, measure this differential pressure, and calculate the pressure difference based on the known fluid state, device geometry and pipe geometry. Note: The standard is the sound source device B/F2624. 2.1.2 Orifice (orifice) Throat (thrkal) The smallest opening in the cross section of the throttling device: Note: For orifices and effective holes, it is only applicable. 2.13 Diameter ratio (diameter ratio) The ratio of the diameter of the throttling orifice (or throat) to the inner diameter of the upstream pipe. Note: This article is used for installation, 2.1.4 Pressure Lapping: pressure taps 2. 1.4.1 Angular connection (ratio) Tapping is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate (or nozzle). The distance between the most positive hole axis and the corresponding end of the orifice plate or nozzle is equal to half of the diameter of the pressure hole itself. The pressure hole penetrates the orifice and is flush with the blood of the orifice.
2.1.4.2 Flange pressure hole (lluge pressaire tapping) is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate. The axis is 25.4mm from the upstream end face and downstream end face of the orifice plate respectively.
2.1.4.3 Venetian pressure hole (vena contrar:lprseur:lupping) is a pair or several pairs of holes drilled on the two sides of the orifice plate. The upstream pressure hole is located at a distance of 1 (the inner diameter of the pipe) from the upstream end face of the orifice plate, while the downstream pressure hole is on the cross section of the minimum static pressure. Because it is located downstream of the orifice plate, the distance from the upstream end of the orifice plate varies with the diameter. 2.11.4/2 Pressure holes (1 and/2 Frerepping) A pair or several pairs of pressure holes drilled in the pipe wall on both sides of the orifice plate. The working pressure hole and the downstream pressure hole are located at the upper end of the orifice and 1P and 0.5D respectively.
2.1.5 Piezualeler nng connects two or more pressure holes on the same cross section to form a pressure balance cavity. The cold ring is used to form an integral part of the warning or downstream in addition to the speed reduction device. 2.1. Ring chamber (nnmlarhambrr)
An equalizing ring that is integrated with the throttling device and flange 2.1.7 Corrierrirg57 Bed slope (la:lalape:botwomslyprc) The height difference of each horizontal run from the riverbed measured in the flow direction. 1.58 Water surface gradient (ufaceloe)
The height difference of the water surface per unit horizontal distance measured in the flow direction: 1.59 Head (E)
The height of the water surface at both ends of a given river section in a given period of time. 1.r water level The height of a river, lake or reservoir relative to a given base. 1.61 Level-discharge relationship The relationship between water level and discharge for a given cross section in an open channel under stable conditions of rising or falling water level. It may be expressed by a line, formula or scale. 1.62 Benchmark A permanent mark of a standard. Its height should be related to the national benchmark as far as possible. I.6 Gauges Well, Stilling Well) is a kind of building connected to the riverbed and used to measure the liquid level of a relatively static river. 1.64 Head (head)
J3F10042004
Drainage is the height of the water flow surface on the double reference surface, and the height of the water flow at the speed cabinet at the reference surface. 2.1 Differential pressure flow meter (differential pressure flow meter) is a flow meter that measures flow based on the differential pressure principle. It consists of a throttling device (or differential pressure flow sensor) and a differential pressure gauge (or differential pressure transmitter and display instrument). 2.1: Throttling device (thrntle devicra) is a device installed in a pipeline to generate pressure, measure this differential pressure, and calculate the pressure difference based on the known fluid state, device geometry and pipe geometry. Note: The standard is the sound source device B/F2624. 2.1.2 Orifice (orifice) Throat (thrkal) The smallest opening in the cross section of the throttling device: Note: For orifices and effective holes, it is only applicable. 2.13 Diameter ratio (diameter ratio) The ratio of the diameter of the throttling orifice (or throat) to the inner diameter of the upstream pipe. Note: This article is used for installation, 2.1.4 Pressure Lapping: pressure taps 2. 1.4.1 Angular connection (ratio) Tapping is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate (or nozzle). The distance between the most positive hole axis and the corresponding end of the orifice plate or nozzle is equal to half of the diameter of the pressure hole itself. The pressure hole penetrates the orifice and is flush with the blood of the orifice.
2.1.4.2 Flange pressure hole (lluge pressaire tapping) is a pair or several pairs of tapping holes drilled on the two sides of the orifice plate. The axis is 25.4mm from the upstream end face and downstream end face of the orifice plate respectively.
2.1.4.3 Venetian pressure hole (vena contrar:lprseur:lupping) is a pair or several pairs of holes drilled on the two sides of the orifice plate. The upstream pressure hole is located at a distance of 1 (the inner diameter of the pipe) from the upstream end face of the orifice plate, while the downstream pressure hole is on the cross section of the minimum static pressure. Because it is located downstream of the orifice plate, the distance from the upstream end of the orifice plate varies with the diameter. 2.11.4/2 Pressure holes (1 and/2 Frerepping) A pair or several pairs of pressure holes drilled in the pipe wall on both sides of the orifice plate. The working pressure hole and the downstream pressure hole are located at the upper end of the orifice and 1P and 0.5D respectively.
2.1.5 Piezualeler nng connects two or more pressure holes on the same cross section to form a pressure balance cavity. The cold ring is used to form an integral part of the warning or downstream in addition to the speed reduction device. 2.1. Ring chamber (nnmlarhambrr)
An equalizing ring that is integrated with the throttling device and flange 2.1.7 Corrierrirg
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