Creep measure-foot high temperature and high pressure steam pipe circumference creep measurement of foot applicable to power plants, steam temperature T> 450 ° C in charge of steam pipe and reheat steam pipes, steam header, and the guide steam pipes, such as creep measurement and safety oversight. The tools used in marker measurement (steel ruler) is the circumference of creep gauge, the relevant requirements of the DL441-2004 thermal power plant high-temperature high-pressure steam pipe creep oversight procedures ". 

 DL-of TLR-D-type high temperature and high pressure steam pipe circumference creep gauge (referred to as the circumference of creep gauge) has obvious advantages compared with traditional micrometer measurement: 
 An easy to operate. Light body shape clever, easy to carry, to increase the labor intensity of light, can operate independently of the single. Does not require temperature correction using the standard calibration. 
 (2) measuring cross-section installation process is simple. Pipeline selected after the newly installed pipeline set or run additional creep measuring mark, each row of adjacent markers centerline in the steel pipe of weeks should be equal to the connection between the distance measuring the width of the strip-foot (40mm), and measurement marked on the tube circumference uniform equidistant distribution. 
 Measurement marked with a diameter of approximately Φ2mm depth of 1mm spherical indentation. Without welding creep measurement nipple. (Measured in the welding point seat easy to crack the high-alloy steel pipe and thick-walled pipe, the creep measurements mark the most appropriate method). 

 Three measured values ??have real meaning. The circumference measurement of the inclusive principle, ruled out the uneven nature of the pipeline organization, creep measurement point welding creep position, caused by the phenomenon of false measurements. 
 4 In order to ensure that each measurement strip foot contact with the steel pipe tightness strip foot should tensioning device with a constant force (high temperature and high pressure steam pipe circumference of the constant force of the creep measurement ruler device Patent No. 200720005103.2), and distribution of dedicated fixed foot with strong magnets, with a light source such as the magnifying glass tool, distribution, infrared thermometer. The calculation method is relatively simple. 
 5 
 Measurement with the cursor strip foot, its accuracy should be at least 0.02mm strip foot use made of Invar alloy (containing 36% Ni, Fe-Ni alloy, 0 ℃ ~ 100 ℃ between the linear expansion coefficient close to 0 ). 
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