Precautions for installing explosion-proof thermal resistance

Method of correct installation of explosion-proof thermal resistance

First of all, before we correct the device, we should understand its principle and structure, so as to facilitate in-depth understanding, so as to better correct device.

Explosion-proof heat resistance: flameproof thermal resistance flameproof thermal resistance specially the structure of the junction box, put its shell internal blasting because of by a spark or mixed gas arc resistance such as shadow to the circuit of repair is bound to change the length of the wire resistance and impact resistance, resistance to replace the new body is good, if choose welding repair, after welding used to check the qualified talents.

Explosion-proof thermal resistance technical parameters

Pressure spring type temperature sensing element, good anti-vibration function; High measurement accuracy; High mechanical strength, good pressure resistance; Imported thin film resistance elements, reliable and stable function; Explosion-proof grade :Exd ⅱ CT4Exd ⅱ CT6ExiaCT4/ExiaCT6 Protection grade IP65 Electrical outlet M20 x 1.5 1/2 "NPT

Requirements for explosion-proof thermal resistance devices

For thermal resistance devices, attention should be paid to the accuracy of temperature measurement, safety and easy maintenance, and does not affect equipment operation and production operation. Be satisfied with the above requirements.

Explosion-proof principle of thermal resistance using gap flame-proof, planning has satisfied the strength of the junction box and other components, all will generate spark, arc and risk parts are sealed in the junction box cavity temperature, when producing blasting cavity, can after stall joint clearance and cooling, flame temperature and not reach after the blasting cavity, and then for temperature measurement.

For the device of explosion-proof thermal resistance, attention should be paid to the accuracy of temperature measurement, safety and easy maintenance, and does not affect the operation and production of equipment. To satisfy the above requirements, the following points should be paid attention to when selecting the device position and penetration depth of the thermal resistance:

1. Explosion-proof thermal resistance with maintenance sleeve has heat transfer and heat dissipation loss. In order to reduce measurement error, thermocouple and thermal resistance should have satisfactory penetration depth:

(1) As for the explosion-proof thermal resistance measuring the fluid temperature in the center of the pipeline, the measuring end should be thrust into the center of the pipeline (straight device or inclined device). If the pipe diameter of the flow body is 200 mm, the penetration depth of the thermal resistance should be selected 100 mm;

(2) For the temperature measurement of high temperature, high pressure and high-speed fluid (such as the temperature of main steam), in order to reduce the resistance of the maintenance sleeve to the fluid and prevent the cracking of the maintenance sleeve under the action of the fluid, maintenance tube shallow insertion method or hot sleeve thermal resistance can be adopted. Shallow plug-in thermal resistance maintenance bushing, the depth of its penetration into the main steam pipe should not be less than 75mm; The standard penetration depth of hot jacket thermal resistance is 100mm;

(3) Suppose it is the temperature of flue gas in the flue that needs to be measured, although the flue diameter is 4m, the depth of thermal resistance is 1m.(4) When the penetration depth of the measuring original is beyond 1m, the device should be as straight as possible, or support frame and maintenance casing should be installed.

2, in order to make the measuring end of the thermal resistance and the measured medium have sufficient heat exchange, should reasonably choose the position of the measuring point, as far as possible to prevent the installation of thermal resistance near the dead Angle of the valve, elbow and pipe and equipment.