CN105784052A - Instrument measuring pipeline constructing method - Google Patents
Instrument measuring pipeline constructing method Download PDFInfo
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- CN105784052A CN105784052A CN201410812687.9A CN201410812687A CN105784052A CN 105784052 A CN105784052 A CN 105784052A CN 201410812687 A CN201410812687 A CN 201410812687A CN 105784052 A CN105784052 A CN 105784052A
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Abstract
The invention relates to industrial measurement, in particular to an instrument measuring pipeline constructing method.The method includes the steps of selecting a check point, manufacturing and installing a source taking part, installing a checking instrument, planning, manufacturing and installing a measuring pipeline, testing the sealing performance of the pipeline, filling the pipeline with a measuring medium, and adjusting the instrument.In the installation step of the measuring pipeline, a transmitter instrument protecting case is omitted if not necessary, transmitter blow-down valves are arranged outside an instrument case, rows of separating containers and blow-down valves are lower than a transmitter and consistent in elevation, an overhaul valve is arranged on each separating container correspondingly, normal continuous checking is not influenced if sewage discharge of the overhaul valve is stopped, the convenient operation principle is adopted for the installation position of the overhaul valve, vent valves and air release valves are closely connected to the upper faces of the separating containers, blow-off pipes are led to be flush with the lower blow-down valve, resin plaster or silica gel is used for sealing outdoor parts, and copper tubes in the pipeline are omitted.The fault points of the instrument measuring pipeline are reduced, position setting is more reasonable, and deviation and errors are reduced.
Description
Technical field
The present invention relates to commercial measurement, particularly relate to instrument measurement pipeline.
Background technology
For a long time, instrument research worker is constantly done one's utmost at the aspect of performance improving instrument itself, with the application of electron tube components and parts for mark, represents first generation instruments on base；With the application of transistor components and parts for mark, represent second filial generation DDZ-II instrument；Apply as mark with MOS integrated circuit and DMOS super large-scale integration, represent third generation DDZ-III instrument.Now, it is intelligent that instrument has had evolved to forth generation, is with microprocessor for core, can zeroing and range on the spot, add both-way communication, the function such as reading and writing and automatic diagnosis.
Developing rapidly of science and technology so that the precision of instrument itself, accuracy, stability, range, function etc. have all reached fairly advanced level.But, measure in practice at Practical Project, indeterminacy, deviation can be run into greatly, the even situation of measurement data mistake.Analyzing reason, the accuracy of instrument measurement depends not only on the performance of instrument itself, and also with the position of test point, infield selects, the mode that instrument is installed, and pipeline connects closely bound up, and these are all the accurate essential conditions of instrument measurement.
For the selection of pressure and flow detection point, specification and atlas all have detailed regulation.The form measuring pipeline also has corresponding specification.As:
1, " Metallurgical Industry Automation instrument installs general atlas with controlling device " (2000) YK, metallurgical industry publishing house；
2, " Metallurgical Industry Automation instrument installs general atlas with controlling device " (90) YK, metallurgical industry publishing house
Etc. specification；But according to the measurement point of these regulations, when measuring gas liquid pipeline, to there is trouble point many, and test point arranges the defects such as position is unreasonable, causes measuring precision poor, and deviation reaches, even measuring error.
Summary of the invention
It is contemplated that overcome the defect of prior art, it is provided that a kind of instrument measurement pipeline construction method.The present invention can reduce the trouble point of instrument measurement pipeline, and position arranges more reasonable, reduces deviation and mistake.
In order to solve above-mentioned technical problem, a kind of instrument measurement pipeline construction method, this construction method includes selecting test point, the making taking source block and installation, instrumentation installation, the measurement planning of pipeline, making and installation, pipeline seal tightness test, measurement medium to fill pipe and instrument debugging；Described measurement pipeline is installed and is included: transmitter meter guard box, if need not, cancel；Transmitter blowoff valve is arranged on outside instrument box；Separation container, blowoff valve are installed and are below transmitter, and separation container, the blowoff valve absolute altitude in a row installed are consistent；Should arranging service valve above separation container, closing service valve blowdown does not affect normal continuous detecting；Service valve installation site is to facilitate operation for principle；Air bleeding valve, atmospheric valve immediately separation container is mounted thereon, and blow-off pipe causes concordant with down blow valve；Outdoor use resin-bonded mastic or silica gel sealing；Cancel the copper tube in pipeline.
Described instrument measurement pipeline construction method, in the middle of described selection test point, for steam pressure point, is arranged in 45 ° of angular range of pipeline center's horizontal line upper and lower.
Described instrument measurement pipeline construction method, takes in making and the installation of source block, and the transmitter of described liquid and steam flow, Level Detection is installed and selected as far as possible to arrange to reduce gas collector lower than pressure point；The transmitter installation site of detection of gas flow rate is selected above pressure point as far as possible to reduce the setting of blowdown drum.
Described instrument measurement pipe record construction method, described measurement pipeline is installed and is also included: in the middle of pressure measxurement pipeline, for the measurement pipeline of liquid or steam, air bleeding valve has been arranged on the top of close separation container, if space is little, then cancels exhaustor and U-bend.
Described instrument measurement pipe record construction method, in the middle of described pressure measxurement pipeline, also include for measuring pipeline installation: for gasmetry, transmitter is arranged higher than pressure point, it is being provided above valve, during this valve closing, it is ensured that at the situation down blow not affecting continuously measurement near separation container, meanwhile, transmitter pipeline is entered for being inclined upwardly.
Described instrument measurement pipe record construction method, in the middle of described pressure measxurement pipeline, for the measurement of dirt and wet gas, transmitter position lower than pressure point, to be provided above valve near separation container.
Described instrument measurement pipe pipeline construction method, described measurement pipeline is installed and is also included: flow, level gauging pipeline, accesses measure pipeline for the gas bag measured in pipeline of a water or sewage horizontally disposed double-chamber balancing vessel of uniting.
Described instrument measurement pipeline, it also includes: for,
Vapour survey pipeline and gasmetry pipeline, cancel straight coupling and three way cock, adopts collar joint to connect each pipeline；
Differential pressure measures pipeline, sets pressure measuring valve near pressure point, cancels the blowoff valve near pressure point and the blowoff valve near transmitter.
Described instrument measurement pipeline, the planning of described measurement pipeline also includes the selection of valves and fittings, wherein
During pressure pipe nipple pressure≤1.0MPa, adopt pipe screw thread；During pressure >=1.0MPa, use taper pipe thread；
Directintermination joint: use bite type, taper pipe thread joint；
Cancel the three way cock in pipeline and next door free flow coupling；
General pipe fitting adopts the pipe fitting identical with main line, for seamless steel pipe employing homogeneity, tubing with footpath；
Condensing container, separation container, spacing container, settler, gas collector require and the same material of pipeline.
Present invention improves over the position of test point, infield selects, the mode that instrument is installed, and the main points such as pipeline connection, trouble point is greatly reduced, improve before irrational point and mounting means are installed, thus for ensureing that measuring accuracy provides safeguard.
Detailed description of the invention
The accuracy of instrument measurement depends not only on the performance of instrument itself, and also with the position of test point, infield selects, the mode that instrument is installed, and pipeline connects closely bound up, and these are all the accurate essential conditions of instrument measurement.
Wherein, instrument measurement pipeline construction operation: select test point------------measurement pipeline makes and installs, and---debug pipeline seal tightness test---measurement medium fills pipe---in measurement pipeline planning in instrumentation installation to take making and the installation of source block by instrument.
1, test point is selected
Test point is generally selected by designer.The selection of test point is required basically identical by design specification and job specfication.
2, making and the installation of source block are taken
Take source block and be mounted in test point, for the steel detected.Different media, different measurement parameters, take source block difference, and installation requirement is different, it is necessary to processing and fabricating and installation.
3, instrumentation is installed
The installation site of instrumentation is generally also determined by designer, but, in order to ensure the convenience of correctness and the observation, maintenance measured, workmen and user of service can also adjust.
4, pipeline planning is measured
Test point and instrumentation are the two ends measuring pipeline, after position is selected, could measure the planning of pipeline.At this moment, the direction of pipeline, the gradient to be considered, it is also contemplated that aerofluxus, blowdown, isolation etc. are the need of the position with setting.
5, measure pipeline to make and install
According to planning, carry out pipeline making, pipeline support installation, pipeline connection and fix.Some special media pipeline needs pre-assembled, such as oxygen, needs dismounting defat, then return dress after pre-assembled.
6, pipeline seal tightness test
After pipeline installation, it is necessary to carry out pressure test or air-tight test.According to medium and the difference measuring pressure, it is possible to carry out hydraulic pressure, air pressure experiment.
7, measure medium and fill pipe
After test, it is necessary to be full of medium to pipeline.Some is measured medium, and some is spacer medium.As measured steam pressure and flow, its spacer medium is water.
8, instrument debugging
After completing above step, it is possible to carry out instrument debugging.Zeroing, adjustment migrate, adjust range etc..
Relate to instrument measurement pipeline construction, mainly
The selection (pressure point or pressure tappings) of test point
The selection of pressure and flow detection point, specification and atlas all have detailed regulation, such as the requirement of straight length, should select before temperature element, avoid eddy current and dead angle.When measuring gas, liquid and steam pressure and flow, the radial orientation of pressure point and pressure pipe is different, but entirely not right.For liquid, 90 ° of angles below pipeline section can not select, and allows for impurity deposition that pipeline would be likely to occur in welding slag, foreign material and the fluid do not cleaned out and blocks measurement pipeline；For gas, select 90 ° of angular range of conduit upper, be the moisture comprised in gas, after condensing in measuring pipeline, pipeline can be back to.But, atlas can only select the saying of 45 ° of angles above pipeline center's horizontal line to be wrong about steam pressure point, it should is that 45 ° of angular range of pipeline center's horizontal line upper and lower can.Because vapour survey pipeline condenser does not have steam, can only be water later.
In engineering reality, causing measurement error and the reason of mistake, common are: restricting element flows to mistake, cutting edge damage, axially vertical degree deviation, Concentricity tolerance, pressure parts enter in pipe, and dirty wet and dusty gas retardance or blocking take source block.
Instrument (transmitter) is installed
Transmitter should be installed nearby.The installation site of transmitter, when domestic custom is typically designed it has been determined that；External custom is generally determined by operator or repair and maintenance personnel on site.Pipeline automatic pressure taking device is to transmitter, and the length measuring pipeline neither be more short more good.Its shortest length should be not less than three meters (fluid in pipeline is suddenlyd change and cushions, it is prevented that damage transmitter), and the longest distance must not exceed 50 meters, and low pressure or minute-pressure Medium Measurement pipeline not can exceed that 30 meters.
The installation site of transmitter and mode, determine the measurement length of pipeline, trend, pipe fitting quantity, even affect the accuracy of measurement.I have selected, in engineering practice, the scheme economized most mostly.Liquid and steam flow, Level Detection, transmitter is installed and is selected lower than pressure point as far as possible, it is possible to reduce gas collector is arranged；Detection of gas flow rate, transmitter installation site is selected above pressure point as far as possible, it is possible to reduce the setting of blowdown drum (separation container, settler).
Measurement pipeline is installed
In engineering practice, to some problems existed in standard collective drawings, it is corrected.1, transmitter meter guard box, if need not preferably cancel；2, specify that transmitter blowoff valve should be arranged on instrument box outer (because instrument box narrow space)；3, specify that the installation of separation container, blowoff valve all should lower than transmitter, separation container, the blowoff valve absolute altitude in a row installed are consistent；4, should being provided with service valve above separation container, closing service valve blowdown does not affect normal continuous detecting；5, service valve installation site can according to environmental condition adjustment, and convenient operation is just；6, air bleeding valve (atmospheric valve) should immediately separation container be mounted thereon, determines whether as the case may be to install blow-off pipe.As installed blow-off pipe, need to cause concordant with down blow valve；7, next door free flow coupling (BULKHEAD UNION), outdoor usable resins clay or silica gel sealing are eliminated；8, bite type, taper pipe thread joint and the valve (valve and joint one) with collar joint are recommended；9, the copper tube in pipeline is eliminated.
Except correction general above, at following measurement pipeline, have also been made some local correction.
Pressure measxurement pipeline (all considers according to least favorable transmitter installation site)
Liquid measure:
Contrasting with atlas (2000) YK02-34, air bleeding valve is arranged on separation container (air collector) top, and effect is also aerofluxus but not blowdown.As not having liquid discharge can cancel exhaustor.
Contrasting with atlas, reduce the fault point 5 places, reduces pipe fitting: free flow coupling 2, tee pipe coupling 1, BULKHEAD UNION 2.
Vapour survey:
Contrasting with atlas (2000) YK02-44, it is immediately above that air bleeding valve has been arranged on separation container (air collector), and effect is also aerofluxus and confirms that water is filled with separation container, but not blowdown.Exhaustor decides whether to cancel depending on concrete condition.Rising prevents the U-bend of expansion from becoming dotted line, in the unallowed situation in space, can cancel.
Contrasting with atlas, reduce the fault point 5 places, reduces pipe fitting: free flow coupling 2, tee pipe coupling 1, BULKHEAD UNION 2.
Gasmetry:
Contrasting with atlas (2000) YK02-32, transmitter is higher than pressure point, is provided with valve separation container is immediately above, closes this valve, it is ensured that at the situation down blow not affecting measurement continuously.Have modified the gradient direction entering transmitter pipeline.
Contrasting with atlas, reduce the fault point 5 places, reduces pipe fitting: free flow coupling 2, tee pipe coupling 1, BULKHEAD UNION 2.Increase pipe fitting: 1 valve.
Dirty, humid gas is measured:
Contrast with atlas (2000) YK02-21, be provided above valve at separation container, close this valve, it is ensured that at the situation down blow not affecting measurement continuously.
Contrasting with atlas, reduce the fault point 4 places, reduces pipe fitting: free flow coupling 1, tee pipe coupling 1, BULKHEAD UNION 2.
Flow, level gauging pipeline (all considering according to least favorable transmitter installation site)
Liquid measure: water (sewage) flow is substantially used electromagnetic flowmeter instead and be have detected, and liquid measure pipeline is mainly used in the Level Detection of drum, thermophore etc..For drum, owing to drum is the entirety of a tri-state unification, having water, have vapour, go back steam critical layer, and change along with the change of pressure and temperature, therefore, measuring liquid level of steam drum needs a double-chamber balancing vessel.
Contrast with atlas (2000) YK07.3-10, the double-chamber balancing vessel gradient has been modified to level.The effect of double-chamber balancing vessel balances exactly, inside and outside integrative, and temperature is identical, and water liquid level is the same.Steam condensation Cheng Shuihui is full of room in container, fills water mistress, just balance out the hydraulic pressure of interior room before measuring.
Contrasting with atlas, reduce the fault point 2 places, reduces pipe fitting: BULKHEAD UNION 2.
Vapour survey:
Contrasting with atlas (2000) YK05-8, pipeline is more succinct.Eliminate unnecessary welding straight coupling and threeway transition joint.
Contrasting with atlas, reduce the fault point 6 places, reduces pipe fitting: welding straight coupling 4, threeway transition joint 2.
Gasmetry:
Contrasting with atlas (2000) YK04-23, pipeline is short and sweet.Eliminate unnecessary straight-through transition joint and threeway transition joint.
Contrasting with atlas, reduce the fault point 4 places, reduces pipe fitting: directintermination joint 4, straight-through transition joint 2, threeway transition joint 2, BULKHEAD UNION 2.
Differential pressure is measured: is mainly used in combustion chamber draft and measures and low-pressure gas flow measurement, for combustion chamber draft,
Contrast with atlas (2000) YK02-59, add 1 pressure measuring valve, be conducive to maintenance.The three valve groups (five valve groups) that in utilization, differential pressure transmitter carries, facilitate the zeroing on the spot of transmitter, adjust range.Decrease one group of blowoff valve.Because being arranged around blowdown at stove and there is no need (measuring pipeline itself very short, minute-pressure and negative pressure line should be shorter), arranging two groups of blowdowns at transmitter place and more there is no need.
Contrasting with atlas, reduce the fault point 4 places, reduces 1, valve, reduces pipe fitting: directintermination joint 2, tee pipe coupling 2.
Four, valve, pipe fitting are selected
Valve: no matter be design or specification, the selection of valve all required, general liquid, gas and corrosivity air-liquid body, all select the valve of corresponding bore, pressure and valve body, inner lining material；Steam, oxygen select inside screw stop valve.
Pressure pipe nipple: during pressure less (≤1.0MPa), it is possible to manual processing, general pipe screw thread, to save cost；During pressure higher (>=1.0MPa), I am in engineering practice, it is recommended to use taper pipe thread, to improve sealing effectiveness (design and atlas all selects be general pipe screw thread).
Directintermination joint: use bite type, taper pipe thread joint, to improve sealing effectiveness and work efficiency.Collar joint is adopted not have at standard collective drawings although oxygen, coal gas etc. measure pipeline, but, welding type and bite type directintermination joint, bite type is slightly excellent, safe and reliable, and efficiency is high.Standard collective drawings does not have low pressure line, oxygen flow to measure pipeline employing bite type, it is proposed that add when correcting.
Threeway transition joint: if possible, it is proposed that all cancel.No matter being welding type or bite type, a three way cock means three leak detection points, unfavorable to measuring.
Next door free flow coupling (BULKHEAD UNION): (if possible) suggestion is all cancelled.The effect of BULKHEAD UNION is very limited, outdoor application cannot good waterproof, indoor use there is no need again, adds the problem points of pipeline.
Piping material: select the tubing identical with fluid main line as far as possible.Unless design requires otherwise, homogeneity tubing is conducive to pipeline to connect.On standard collective drawings, measure pipeline and have seamless pipe, there is copper tube, also has reducing (straight-through reducing joint), thinner copper tube, suggestion changes homogeneity, tubing with footpath into when correcting, had both saved nonferrous materials and had reduced cost, reduces again pipe resistance and ensures pipeline unification attractive in appearance (when especially in a row installing).
Condensing container, separation container, spacing container, settler, gas collector: on standard collective drawings, the material not requirement to container, it is proposed that require and the same material of pipeline when correcting.Settler is typically now no longer used.
Important explanation: 1, measure pipeline connecting parts and select welding type (pressure pad type), adopts seal washer to seal, it is simple to being dismounted for multiple times.Shortcoming is to be not easy to install, and seal washer is always bad, it is necessary to often change.High temperature and high pressure steam pipeline is more frequent.2, bite type connect can high temperature high voltage resistant, install, convenient disassembly, do not need welding of getting angry, can prefabricated construction, especially China's processing manufacturing industry level improve after, tube quality, cutting ferrule crudy are greatly improved, emerging in large numbers of various bite type valve, connects for bite type and provides wide prospect.
Claims (9)
1. an instrument measurement pipeline construction method, this construction method includes selecting test point, the making taking source block and installation, instrumentation installation, the measurement planning of pipeline, making and installation, pipeline seal tightness test, measurement medium to fill pipe and instrument debugging；It is characterized in that, described measurement pipeline is installed and is included: transmitter meter guard box, if need not, cancel；Transmitter blowoff valve is arranged on outside instrument box；Separation container, blowoff valve are installed and are below transmitter, and separation container, the blowoff valve absolute altitude in a row installed are consistent；Should arranging service valve above separation container, closing service valve blowdown does not affect normal continuous detecting；Service valve installation site is to facilitate operation for principle；Air bleeding valve, atmospheric valve immediately separation container is mounted thereon, and blow-off pipe causes concordant with down blow valve；Outdoor use resin-bonded mastic or silica gel sealing；Cancel the copper tube in pipeline.
2. instrument measurement pipeline construction method according to claim 1, it is characterised in that in the middle of described selection test point, for steam pressure point, is arranged in 45 ° of angular range of pipeline center's horizontal line upper and lower.
3. instrument measurement pipeline construction method according to claim 1, it is characterised in that take in making and the installation of source block, the transmitter of described liquid and steam flow, Level Detection is installed and is selected as far as possible to arrange to reduce gas collector lower than pressure point；The transmitter installation site of detection of gas flow rate is selected above pressure point as far as possible to reduce the setting of blowdown drum.
4. instrument measurement pipe record construction method according to claim 1, it is characterized in that, described measurement pipeline is installed and is also included: in the middle of pressure measxurement pipeline, measurement pipeline for liquid or steam, air bleeding valve has been arranged on the top of close separation container, if space is little, then cancel exhaustor and U-bend.
5. instrument measurement pipe record construction method according to claim 4, it is characterized in that, in the middle of described pressure measxurement pipeline, install also include for measuring pipeline: for gasmetry, transmitter is arranged higher than pressure point, be provided above valve near separation container, during this valve closing, ensure at the situation down blow not affecting measurement continuously, meanwhile, enter transmitter pipeline for being inclined upwardly.
6. instrument measurement pipe record construction method according to claim 4, it is characterised in that in the middle of described pressure measxurement pipeline, for the measurement of dirt and wet gas, transmitter position lower than pressure point, to be provided above valve near separation container.
7. instrument measurement pipe pipeline construction method according to claim 1, it is characterized in that, described measurement pipeline is installed and is also included: flow, level gauging pipeline, accesses measure pipeline for the gas bag measured in pipeline of a water or sewage horizontally disposed double-chamber balancing vessel of uniting.
8. instrument measurement pipeline according to claim 7, it is characterised in that it also includes: for,
Vapour survey pipeline and gasmetry pipeline, cancel straight coupling and three way cock, adopts collar joint to connect each pipeline；
Differential pressure measures pipeline, sets pressure measuring valve near pressure point, cancels the blowoff valve near pressure point and the blowoff valve near transmitter.
9. instrument measurement pipeline according to claim 1, it is characterised in that the planning of described measurement pipeline also includes the selection of valves and fittings, wherein
During pressure pipe nipple pressure≤1.0MPa, adopt pipe screw thread；During pressure >=1.0MPa, use taper pipe thread；
Directintermination joint: use bite type, taper pipe thread joint；
Cancel the three way cock in pipeline and next door free flow coupling；
General pipe fitting adopts the pipe fitting identical with main line, for seamless steel pipe employing homogeneity, tubing with footpath；
Condensing container, separation container, spacing container, settler, gas collector require and the same material of pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113483946A (en) * | 2021-06-01 | 2021-10-08 | 广西防城港核电有限公司 | Water filling and exhausting system and method for differential pressure transmitter |
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Application publication date: 20160720 |