How to install the precision pressure gauge correctly

The installation position of the precision pressure gauge should meet the requirements of the installation state. The dial should generally be in a vertical state, and the position should be suitable for observation by the staff. At the same time, the tightness should be ensured and no leakage should occur.
The following issues should be noted during installation:
(1) Selection of the pressure port position of the precision pressure gauge: one is to make the sampling pipe and the flow direction of the medium perpendicular to each other, and to avoid the selection of valves, bifurcations, and elbows where vortexes are easily formed; the second is when there are protruding objects in the pipeline , The pressure tap should be taken in front of it; third, when measuring liquid and water vapor pressure, the pressure tap should be set on the lower side wall of the horizontal pipe, so that there is no gas in the pressure pipe and avoid the sediment in the pipe from blocking the sampling pipe口; Fourth, the pressure gauge for measuring liquid and vapor media should be installed in the lower part of the instrument panel to prevent liquid or condensation from dripping onto other instruments.
(2) Laying of pressure guiding pipe for precision pressure gauge: The function of pressure guiding pipe is to transmit the pressure signal from the pressure point to the pressure gauge. Pay attention to its laying: First, the inner diameter of pressure guiding pipe is usually 6～10mm, and the length is less than 50mm. , In order to reduce the measurement error and avoid the delay of the indication of the pressure gauge caused by the lag of the medium; the second is that the horizontal section of the connecting pipe should have a certain slope, and the slope of 1:10～1:20 should be maintained to facilitate the condensate in the tube or The gas is discharged, and the third is to install an isolation valve on the pressure-inducing pipeline to facilitate the maintenance of the pressure gauge.
(3) Determination of installation height: The installation height should be suitable for observation by the staff, and be level with the sight of ordinary people, that is, 1.5m ~ 1.6m. For high pressure, it should be higher than the head of ordinary people, that is, about 1.7m ~ 1.8m. When the installation position of the pressure gauge is far away from the position of the pressure measuring point, the liquid column difference should be corrected. The correction value is equal to the pressure value generated by the liquid column in the conduit with the vertical height difference between the meter and the pressure measuring point. When the meter is higher than the pressure measuring point, add this correction value; conversely, when the meter is lower than the pressure measuring point, this value should be subtracted.
(4) Use sealing gaskets: In order to ensure the tightness, a suitable gasket should be selected for the seal between the joint of the pressure gauge and the gauge seat. When the working temperature and pressure are lower than 80℃ and 2MPa, use leather gasket or rubber gasket; at 80℃～45℃, use asbestos paper or aluminum gasket below 5MPa; when working temperature and pressure are higher, use annealed copper gasket or Lead pad.
Desander is used to process the aggravated drilling fluid, but a large size desander with a separation particle size greater than 74μm must be used. Since the sinking diameter ratio of barite to drill cuttings particles is about 1:1.5, a de-sander that can remove drill cuttings particles above 74μm can also remove barite powder above 49μm. This part of the particles in the barite account for about 10%-15%. The weighted drilling fluid that has been pretreated by this de-sander enters the mud cleaner, which can greatly reduce the burden of the mud cleaner. The disadvantage is that some of the barite with larger particle size suffers some losses.

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