Issues with gauge openings on the equipment
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Instruments are installed on equipment, and these instruments require an opening of a certain size in the equipment; I keep forgetting what that size should be. How large should the opening be for the instruments? For example, in the case of thermal resistors and level gauges
This is unimaginable; generally, the requirements for the equipment are determined based on the dimensions specified in the selected sample
It depends on the type of gauge you are using. If it’s for measuring pressure, the union fitting is usually size 14. In the case of flange-type connections, it depends on the size of the pipe fittings; you can take those fittings to a welder and ask him to cut holes according to their size. The same applies to level gauges
Such information is not provided on most of the sample selections
It is generally not allowed to make openings in equipment (pressure vessels); temperature gauges and level gauge interfaces are pre-installed in the equipment at the time of manufacture.
The size of the opening on the equipment must be determined based on the dimensional specifications of the instrument process interface. Generally, it’s sufficient to return the instrument ordering form to the equipment department.
The common sizes for level gauge openings are 2 inches and 3 inches； Thermal resistor, 1.5 inches. The instrumentation team will prepare the parameters, which will then be sent to the equipment team; it’s best to consult the manufacturer to see if this size is available.
For projects abroad, the dimensions for the process connections are usually specified at the beginning; I’m not sure how it’s done in domestic projects.
This post was last edited by AutoAlways on 2015-12-1 at 16:26. I’m not sure whether you determine the opening size/pressure rating of the instruments during the design phase before equipment manufacturing, or once the equipment has arrived at the site and is ready to have those additions made there. It is not allowed to make additional openings in pressure vessels on site. During the design phase, the opening size needs to be determined based on the type of instrument. Generally, float level gauges have 2\" openings, temperature instruments have 1-1/2\" openings, pressure instruments have 3/4\" openings; single-flange/double-flange transmitters have 2\" or 3\" openings, while radar level gauges can have openings of 3\", 4\", or 6\". It’s not just a random estimate; there must be a basis for it. In other words, the type, design, and quantity of instruments to be used need to be determined in advance based on the process requirements. As for the pressure rating, it is necessary to consult the equipment specialists; the pressure rating of the opening should not be lower than that of the equipment itself.