When the working temperature of carbon steel is less than -2 ℃, and when the working temperature of carbon steel is less than 0 ℃, it is not suitable to use mechanical equipment for punching and shearing. Thick steel plates that cause cracks after wire cutting should undergo heat treatment immediately after welding, otherwise post heat treatment should be performed. The post weld heat treatment of flanged rubber expansion joint shall be carried out in accordance with the requirements of DL/T752, but for the large post weld heat treatment, the temperature control temperature shall be 2 ℃~3 ℃ lower than the middle and low temperature of the original materials on both sides and welding deposition.
Flange type rubber expansion joint shall be installed according to the following steps:
1. Preparation: Clean the flange and sealing surfaces on both sides of the pipeline, and check whether the flanges, bolts, and gaskets are intact and undamaged.
2. Flange installation: align the flange of the rubber expansion joint with the flange on both sides of the pipeline, pass the bolt through the flange hole, and apply appropriate lubricant on the flange nut.
3. Adjust the expansion joint: after fixing the flange, adjust the direction and position of the rubber expansion joint to keep it in a natural state and avoid excessive tension or compression.
4. Fixed anchor rod: If an anchor flange is required, the anchor rod needs to be connected to the flange and anchored to the ground or bracket through fixed devices such as anchor plates.
5. Tight bolts: tighten the bolts alternately from both ends until all bolts are tightened evenly and moderately to ensure the sealing and connection performance between the flange and the rubber expansion joint.
6. Inspection: finally, check whether the whole installation process meets the requirements, and confirm whether the expansion joint is properly installed
The material and installation of flanged rubber expansion joint indicate a certain deviation, so it can be adjusted according to the actual installation specifications during installation and maintenance, and the radial driving force can be transmitted to all pipeline system software during operation. This not only improves work efficiency, but also has a certain protective effect on pipeline mechanical equipment such as pumps and valves.
Installation instructions for flange rubber expansion joint. When the temperature changes, the pipeline can freely expand and contract in the middle of the interface. When the foundation sinks, the pipeline can tilt and ensure that there is no leakage in the sealing, and then have the purpose of automatic compensation.
Single flange limit rubber expansion joint is suitable for connecting with flange and welding with pipeline. During installation, adjust the assembly length between the two sides of the commodity and the pipeline or flange, tighten the anchor bolts of the valve cover symmetrically at the top angle, and then adjust the nuts so that the pipeline can expand and contract freely within the range of retraction and retraction, lock the expansion and contraction amount, and the pipeline can operate reliably. Flange limiting rubber expansion joint is suitable for connecting both sides of the flange. During installation, adjust the connection length of both sides of the goods, tighten the bonnet bolts evenly at the top angle, and then adjust the positioning nut, so that the pipeline can be expanded and expanded at will, and the length of both ends of the expansion device can be adjusted. The rubber expansion joint is suitable for connecting both sides with the pipeline without electric welding, with reasonable structure, good sealing performance, and quick and convenient installation.
The single flange limit rubber expansion joint has a certain multi-directional offset effect in the pipeline operation, and plays a vital role in the expansion compensation for the surface depression and bending moment due to thermal expansion in the pipeline operation. Therefore, the rubber expansion joint can reduce the thrust force of the blind plate in the pipeline operation, and has certain maintenance for the pipeline, especially for the installation and maintenance of the pipeline. The single flange limiting rubber expansion joint shall be equipped with positioning equipment on the basis of the original characteristics of the rubber expansion joint, and shall be locked with nuts at the place with large expansion amount. The pipeline can be extended arbitrarily within the allowed extension range, and once it exceeds its larger extension, it can ensure the reliable operation of the pipeline, especially on pipelines with vibration or certain inclination and turning angles.
Post time: Apr-23-2023
