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Anti-freeze alarming method for pressure conduction tube of instrument

A technology of pressure guide tube and instrument, which is applied in the field of temperature measurement and alarm of instrument pressure guide pipeline, which can solve the problems of frozen transmitter in the incubator, increased cost of communication points, loss of application value, etc., so as to facilitate construction and laying, and solve freezing faults The effect of the alarm

Inactive Publication Date: 2012-06-20
中石油(内蒙古)新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Frozen meter failure of the instrument transmitter and freezing failure of the pressure guide tube can be divided into three situations. 1. The insulation layer of the transmitter’s incubator is damaged or the door is opened, causing the transmitter in the incubator to be frozen.
2. The heat tracing in the pressure guiding tube and the incubator is damaged or stopped, causing all the pressure guiding tubes to freeze and the transmitter in the incubator to freeze and fail
3. The insulation layer of the pressure guiding pipe is partially damaged, resulting in partial freezing
However, in the second and third cases, there is no measurement method and equipment for the temperature of the pressure guiding tube.
[0006] At present, there are optical fiber pipes for temperature measurement, and the interval of temperature measurement points is generally ≥1 meter; the temperature measurement cable for granaries, the interval of temperature measurement points is generally ≥1 meter, and for the freezing phenomenon of pressure guiding tubes, the density of temperature measuring points of pressure guiding tubes is at least 10cm each, so as not to be missed; after adding more temperature measurement points for fiber optic pipes and granary temperature measurement cables, the number of communication points will increase and the cost will increase sharply so that the application value will be lost

Method used

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  • Anti-freeze alarming method for pressure conduction tube of instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1. Use the magnetic sensitive switch to perform an antifreeze alarm on the pressure guiding tube of the instrument

[0021] First, the wire 2 with multiple magnetic sensitive switches 1 connected in series is coated with an insulating cable layer, the distance between two adjacent magnetic sensitive switches 1 is 7 cm, and the multiple magnetic sensitive switches 1 are evenly arranged; The operating temperature of switch 1 is 0°C, and its temperature error is ±1°C, that is, when the temperature is greater than 0°C, the magnetic switch 1 is normally closed, and when it is less than or equal to 0°C, the magnetic switch 1 is normally open; The wire 2 is fixedly laid in the insulation layer along the pressure guiding tube, and the magnetic sensitive switch 1 arranged at both ends of the wire 2 is connected with the DCS switch value card. The DCS switch value card is displayed by two digits: ○ and ●; In this way, when the heat tracing fails, when the pressure guid...

Embodiment 2

[0022] Embodiment 2. Use the magnetic sensitive switch to perform an antifreeze alarm on the pressure guiding tube of the instrument

[0023] According to the same method as in Example 1, the wires 2 connected in series with a plurality of magnetic sensitive switches 1 with an operating temperature of 0°C are fixedly laid in the insulation layer of the instrument pressure guiding tube for freezing prevention, wherein every two adjacent magnetic sensitive switches 1 The distance between the switches is 7cm; then, according to the same method as in Example 1, a plurality of magnetic switches with an operating temperature of 5°C are connected in series (that is, the magnetic switch is normally closed when the temperature is greater than 5°C, and the magnetic switch is normally closed when the temperature is less than or equal to 5°C). The magnetic sensitive switch is normally open, and its temperature error is up to ±1℃), and the wire is fixed in the above insulation layer, and th...

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Abstract

The invention discloses an anti-freeze alarming method for the pressure conduction tube of an instrument, comprising the following steps of: laying a conductive wire connected with a plurality of temperature switches in series in the thermal insulating layer of the pre-anti-frozen pressure conduction tube of an instrument; connecting the temperature switches disposed at the both ends of the conductive wire with a DCS (distributed control system) card; when the temperature of the pre-anti-frozen pressure conduction tube of an instrument is decreased to the action temperature of the temperature switches, cutting off the actions of the temperature switches, and then sending an alarming signal by the DCS card. The anti-freeze alarming method for the pressure conduction tube of an instrument disclosed by the invention has the following advantages that: because the used temperature switches are small in volume and low in price, one monitoring point in a distance of not greater than 10 cm can be realized, and demand on detection distance can be achieved; and because only one lead wire is used, the lead wire can be conveniently packaged in an insulating cable, and construction and laying are facilitated. The anti-freeze alarming method for the pressure conduction tube of an instrument provided by the invention composes a temperature defence line (or a door) via the series connection of temperature switches (which are normally closed at a high temperature and cut off at a low temperature) low in price, thereby skillfully solving the problem of freeze fault alarming of the pressure conduction tube.

Description

technical field [0001] The invention relates to an anti-freeze alarm method for an instrument pressure guiding pipe, which belongs to the technical field of temperature measurement and alarm of the instrument pressure guiding pipeline. Background technique [0002] Located in the north, most of the chemical production is outdoors, and the heating period in winter is more than half a year. Most of the pressure guiding tubes of instrument transmitters use water as the medium to transmit pressure. Therefore, the pressure guiding tubes of transmitters need to be heated and kept warm. Most of the chemical companies have shut down many times because of the failure of the frozen meter of the instrument transmitter and the frozen fault of the pressure guide tube, resulting in heavy losses. Even the failure of the frozen meter of the instrument transmitter caused the instrument transmitter to be scrapped, resulting in direct economic losses. At present, we can only rely on manual ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/36
Inventor 王慧
Owner 中石油(内蒙古)新材料有限责任公司