1. Rust removal and painting of pipes
Request:
1. Before installation, use the mechanical wire wheel to remove the rust, after the rust removal is completed, the metallic luster should be exposed, and the floating rust of the pipeline should be cleaned with a cloth.
2. The paint used is high-temperature resistant paint, which has passed the examination and inspection, and the information is complete
3. Paint evenly according to the design paint thickness requirements, and test the thickness if there is a paint film thickness requirement.
4. Reserve no less than 100mm at both ends of the pipe without painting
2. a guide sliding bracket
DN≥125 is U-shaped
DN≤100 is a T type
Request:
1. The weld seam of the bracket is full and flat, and the spatter is cleaned and anti-corrosion
2. The sliding surface and edge of the bracket are flat, and the gap between the guide rail and the slide plate is 3mm.
3. When the design is not specified, the installation position of the bracket should be offset from the center of the supporting surface to the reverse direction of displacement, and the offset should be 1/2 of the displacement value, and the insulation layer should not hinder its displacement
3. Fix the bracket
Request:
1. The form, size, load-bearing and thermal insulation space of the bracket meet the design requirements, and the bearing, welded ribs and pipes are firmly welded
2. The welding surface of the bracket is smooth and flat, and the splash is cleaned and anti-corrosion
3. No 2 or more fixed brackets shall be placed on the straight pipe section without a compensation device
Combined guided, sliding bracket
Request:
1. The weld seam of the bracket is full and flat, and the spatter is cleaned and anti-corrosion
2. The sliding surface and edge of the bracket are flat, and the gap between the guide rail and the slide plate is 3mm.
3. When the design is not specified, the installation position of the bracket should be offset from the center of the supporting surface to the reverse direction of displacement, and the offset should be 1/2 of the displacement value, and the insulation layer should not hinder its displacement
4. Pipe reducing
Request:
1. The transverse steam pipeline is installed with an eccentric bottom flat
2. The steam condensate pipeline is installed with concentric variable diameter
5. Pipe branch connection
Request:
1. The pipe branch shall use the finished tee
2. The branch pipe should be led out from above the transverse main pipe to prevent condensate from entering the branch pipe
6. Filters and valves
Request:
1. When the filter is installed in the transverse pipe, the filter element is installed horizontally (to reduce the occurrence of water hammer)
2. The material and mesh of the filter screen meet the design requirements of the project
3. The diameter of the flange bolt is matched with the flange, installed inward, the maximum exposed length does not exceed 1/2 of the bolt diameter, with flat gasket and spring pad.
4. The gasket is a metal graphite pad or a high-temperature PTFE pad.
Note: All brackets must be section steel structure, no booms are allowed
7. Sleeve compensator
Request:
1. The manufacturer is required to pre-stretch or compress when ordering
2. Install according to the flow direction of the media
3. The center line of the pipeline and the compensator is consistent, and a guide sliding bracket is arranged in front of the compensator, the spacing of the first guide bracket at the compensation end is not more than 4D, and the second is not more than 14D, and only one compensator can be installed on the two fixed brackets
4. The sleeve compensator should be installed near the fixing support, and one end of the outer casing should be facing the fixing bracket of the pipe, and the one end of the inner casing should be connected to the pipe that produces thermal expansion.
5. When welding, the flange is required to be perpendicular to the center line of the pipeline, the flange and the surface of the compensator are parallel to each other, and the gasket should be evenly stressed after padding.
8. Corrugated compensator
Request:
1. During installation, set up a temporary restraint device, remove it after the pipeline is installed and fixed, and adjust the bolts for the expansion and contraction amount of the installation compensation at the limit to play the role of limiting
2. One end of the corrugated expansion joint with a weld should be located at the medium end on the horizontal pipe and the upper part on the vertical pipe
3. When installing, it should be concentric with the pipeline and should not be deviated
4. Set up guide and fixed brackets at both ends of the corrugated expansion joint, and no temporary supports shall be welded;
5. The installation error of the pipeline shall not be adjusted by the method of deformation of the pipeline or the compensation of expansion joints
9. U-shaped compensator
Request:
1. Bending compensator, DN<100 should be bent into the whole pipe, the radius of curvature R=4D, DN≥100, R=1.5D If the interface is needed, the weld position should be set in the middle of the straight arm.
2. Pre-stretching after the installation of the compensator is completed: you can choose to use a jack to prop up the two arms, and the pre-tension length is half of its thermal elongation, and then it is supported and fixed with a steel pipe, and the support is removed after the welding with the system pipeline and the fixing bracket is completed.
3. When installed horizontally, the parallel arm should have the same slope as the pipeline
10. Trap manifold
Request:
1. The flange connecting bolts are installed inward
2. Gasket requirements (metal graphite pad for carbon steel, high temperature PTFE pad or stainless steel winding pad for stainless steel)
3. The filter element is partially installed vertically
4. Check that the valve is in the correct position, the switch is flexible, easy to operate, and the drain is safely drained, and the flushing pipe in front of the filter can be canceled
5. If the trap is discharged separately, no check valve is set
11. Safety valve
Request:
1. Before the installation of the qualified safety valve, go to the local technical supervision bureau for calibration and sealing, and the calibration report is archived
2. The safety valve is installed vertically, and the release outlet is connected to a safe place
3. A drain pipe is set at the lowest end of the drain pipe
12. Pressure reducing valve group
Figure 1
Figure 2
Request:
1. There are two types of steam pressure reducing valve components: with bypass and without bypass (preferably with bypass), and the steam inlet can be installed with a separator (Fig. 1) or a water collector (Fig. 2).
2. The shut-off valve, pressure reducing valve and filter are installed in the correct direction, and the operator should be maintained, and the filter element: the steam pipeline is installed horizontally, and the condensate pipeline is installed vertically
3. Variable diameter eccentric bottom flat installation
4. The diameter of the flange bolt is matched with the flange, installed inward, the maximum exposed length is not more than 1/2 of the bolt diameter, with flat gasket and spring pad.
5. The pressure gauge before and after decompression should be equipped with an annular or U-shaped condensation bend, and the pressure gauge should be calibrated and within the validity period.
6. Gasket requirements (metal graphite pad for carbon steel, high temperature PTFE pad or stainless steel winding pad for stainless steel)
7. The safety valve drain pipe is emptied to a safe position
8. If the weight of the pressure reducing valve is large, it should be supported separately