The use of thermal resistance on-site verification requirements?

The use of thermal resistance on-site verification requirements?

a, in order to make the measurement of thermal resistance and has an abundance of heat exchange between the measured medium, should choose the measuring point position, as far as possible to prevent the valve, elbow and thermal resistance corner adjacent piping and equipment installations.

2, with maintenance casing thermal resistance of heat transfer and heat loss, in order to reduce measurement error, thermocouple and thermal resistance should have enough in depth: 1. About the temperature of heat resistance between fluid, ordinary measurement end thrust into the pipe should be (at the centre of the Vertical device or tilted device) 。 As the current body of pipe diameter is 200 mm, the thermal resistance should choose 100 mm in depth; 2. When the original measurement into depth beyond 1 m, what needs to be able to vertical device, or add racks and maintenance of the casing; 3. Assume that demand is measuring the temperature of flue gas, while the flue is 4 m in diameter, depth of the thermal resistance in 1 m;

4。 About the high temperature and high pressure and high fluid temperature measurement ( Such as main steam temperature) , in order to reduce the maintenance of fluid resistance and avoid maintenance attack while under the effects of fluid fracture, can accept maintenance tube shallow plugging method or using shell hot resistance, shallow inserted type thermal resistance of casing maintenance, its into the depth of the main steam pipe should be no less than 75 mm; Shell hot resistance specification into a depth of 100 mm.