Abstract: in view of using mass flowmeter in liquefied petroleum gas flow measurement scale of knowledge to explore information produced by excellent
flow meter, flow meter manufacturer to offer you the quotation.
Liquefied petroleum gas is petrochemical enterprises, the main products and one of the important raw materials.
Due to the physical nature of liquefied petroleum gas (LPG) than other oil products (
Such as gasoline, kerosene, diesel oil, etc. )
Has its particularity, the impact on the stable operation of the flowmeter and measurement accuracy.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is for using mass flowmeter in liquefied petroleum gas flow measurement scale knowledge article details are discussed.
Liquefied petroleum gas is petrochemical enterprises, the main products and one of the important raw materials.
Due to the physical nature of liquefied petroleum gas (LPG) than other oil products (
Such as gasoline, kerosene, diesel oil, etc. )
Has its particularity, stable operation and measurement accuracy of the flowmeter, therefore become a big problem in the refining business flow measurement.
We through more than ten years of trial and error, and improve the measuring method and measuring method, at the same time thanks to flowmeter technology becoming mature, in the recent ten years is a good way to solve the problem at present.
The following two aspects to introduce our approach.
One, the influence of liquefied petroleum gas flow measurement stability and accuracy of the main causes of constitute the main composition of liquefied petroleum gas is propane, propylene, butane, isobutene.
Differ as a result in the refinery process, processing way is different, so the selling or buying of liquefied petroleum gas (LPG) varieties also differ.
For convenience of discussion, the author is given in table 1 the main composition of several physical constants.
1.
Saturation vapour pressure influence on measurement accuracy can be seen from table 1, liquefied petroleum gas (LPG) of saturated vapor pressure is much higher than other oil products.
In the flow measurement, therefore, if the back pressure meter is not higher than the vapor pressure, in the body cavity flowmeter measurement can produce gas and liquid two phase.
No matter for measuring instrument (volume
Such as turbine meter or displacement meter)
Or mass flowmeter, the existence of gas and liquid two phase fluid will directly affect the measurement accuracy, and sometimes this influence is very big.
Effects related to the types of flowmeter, the size of the related to air content percentage of size also.
Effects on turbine flowmeter is greater than the displacement meter and the influence of the mass flowmeter, the air content ratio, the greater the effect.
Especially for similar this kind of indirect loading output system of technological process, stop pumping quantity during the pipeline internal pressure is reduced, there will be a large number of gas phase.
Wait until the next time you open pumping quantity, gas phase high-speed flow meter, will cause the turbine rotor high-speed rotation, or volumetric flowmeter, the damage to the instrument is great, sometimes will directly cause the instrument damage.
Table 1 main composition of liquefied petroleum gas (LPG) several physical constant 2.
Liquefied petroleum gas (LPG) self lubrication bad influence on the service life of the meter in the turbine or volume flowmeter measurement liquefied petroleum gas (LPG), due to poor liquefied petroleum gas (LPG) self lubrication, that is people often say that comparison & other;
Acerbity & throughout;
, cause bearing rotor and stator, rotor and measuring cavity wall between between serious wear and tear, and directly affect the service life of flowmeter.
At present, made from tungsten carbide hard alloy steel shaft and bearing of turbine flowmeter can be used with slightly better, general operation can reach 1 ~ 2 years in a row.
Ordinary steel shaft or the bearing general can only use 3 ~ 6 months.
Second, adopt measures to avoid 1.
Flowmeter selection according to our many years of experience, as well as the analysis of the physical property of liquefied petroleum gas (LPG), we think the first choice for the mass flowmeter, followed by cemented carbide shaft and bearing of turbine flowmeter.
Mass flowmeter generally higher than the price range of turbine flowmeter 3 ~ 5 times.
My company is currently the actual usage is: foreign trade handover with mass flowmeter, accounts for about 10%, factory equipment material transfer between measurement with turbine flowmeter, accounts for about 90%.
From the technical performance, service life, measurement accuracy, operation stability and maintenance workload on comparison, mass flowmeter is superior to the turbine flowmeter.
But compare from the one-time investment, turbine flowmeter and mass flowmeter is much more economic.
Through the above comparison, we think in the foreign trade handover measurement, the mass flowmeter is necessary.
The one-time investment, but it is far better than that of the turbine flowmeter of technical performance in.
First of all, its measuring cavity have no moving parts, overcome the impact of the bad self lubricating fluid.
At the same time, it is directly measured fluid delivery quality, and turbine flowmeter measurement is the volume of fluid, in the conversion to transfer quality, want to measure parameters such as temperature, pressure, density of the fluid.
Of liquefied petroleum gas density measuring instrument online price is very high, much higher than mass flowmeter.
If the offline analysis, the first is the representative of the sampling is not good, when sampling, the more the light component is easy to cause the sample density is less than the actual fluid density.
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