Use and maintenance of plastic tubes The tube and tube assembly are carefully managed. Do not drag on a sharp or abrasive surface, or kink or flatten, for example, do not allow the wheel to pass over the tube. pressure The pressure (including pulse pressure) charged into the tube product must not exceed the specified design working pressure. temperature tube products shall not be used at temperatures outside the temperature range specified or recommended by the tube manufacturer, including the temperature of the material being conveyed and the ambient temperature. Conveying material The tube and tube assembly can only be used to transport the materials specified in the design. If you have doubts about its suitability, ask the tube manufacturer. Care should be taken when transporting potentially hazardous materials, such as toxic, corrosive, explosive, and flammable materials, to minimize the effects of spillage. It is required that the tube and tube assembly not be filled with the material being conveyed when not in use. surroundings tube and tube assemblies must not be used in environments where they are designed. If there is doubt about its suitability or when it is to be used under special or different conditions, it should be negotiated with the tube manufacturer. Bending radius The tube and tube assembly must not be used below the minimum bend radius specified or recommended by the tube manufacturer, as this will limit the passage of the material being conveyed. Bending or twisting near the tube joint should be avoided, as continuous bending at these locations can cause increased fatigue damage to the tube, causing the tube to prematurely damage the ring (see Figure 1) (omitted) Torsion stress tube and tube assemblies are generally not suitable for operation in a twisted state. Tensile stress The tube and tube assembly can withstand tensile stress only in special designs. If you have doubts about the suitability of the tube, ask the tube manufacturer. vibration Vibration can cause fatigue in the tube and tube assembly, especially near the joint of the pipe joint, causing the tube assembly to prematurely damage the ring. It should be ascertained from the tube manufacturer that the tubes designed are designed to withstand vibration. End pipe joint Before proceeding with the installation of the end fittings, check that the fittings and tubes match and that the method of installation is reliable. If in doubt, consult the tube and end fitting manufacturer. The edges of the fittings should be smooth and the dimensions of the tailpieces, ferrules, etc. must be guaranteed to ensure an effective seal when properly installed. The crimping pressure and the amount of torque of the cuff must be controlled, otherwise the applied pressure and the amount of torque that is insufficient or too large will cause the assembly to be prematurely damaged. In order to facilitate the insertion of the pipe joint into the tube, it is recommended to use water or soapy water, unless the tube is specified to transport oil, grease or solvent-based materials. When inserting the tube into the fitting, be careful not to twist the tube. leakage After the end pipe joint is installed, it is required to carry out the hydraulic test according to the test pressure specified by the tube for the tube assembly according to GB 5563. The joint shall be free from leakage, and the pipe joint and the tube shall not slip. Electrical performance test If the electrical properties of the tube and tube assembly are required, the test can be carried out periodically according to GB 9572. Fixed assembly For assembly of fixed tube and tube assemblies, wherever possible, they should be secured with suitable clamps. It must be ensured that the tube can move normally (ie, expand and move) under vacuum or vacuum conditions, and tube length changes and distortions must not be limited by the clamp installation. Moving parts If the tube and tube assembly are used as a coupling in a moving part or assembly, the length should be such that it is not too long, and the tube should not be subjected to vibration loads during movement, clamping, friction, excessive Bending or excessive tensile or torsional stress. Sign If the tube is marked with the requirements of the tube standard or other signs, it is required not to use the paint and ink directly on the tube for marking, and the adhesive is required to mark the coating to avoid the production of these coatings and inks. The solvent is not compatible with the tube outer layer compound. service tube and tube assemblies shall be tested or inspected periodically, unless otherwise required by the relevant rules and standards, to ensure that they are suitable for continued use. Pay particular attention to the situation at and near the tube connection, as well as the performance degradation due to normal aging of the tube or damage due to abuse or accident under abnormal conditions. The tube with the following defects is disqualified: a. perforation, cracking, tearing, reinforcement layer exposure, ozone cracking; b. local deformation, foaming, expansion under pressure; c. There is a soft and hard skin on the tube. When the tube mark is marked with an expiration date, it should be monitored even if the tube does not exhibit performance degradation. tube repair Generally, the tube is broken and not repaired. However, if damage occurs at the end of the tube and the undamaged tube portion is long enough, the damaged portion of the tube can be cut and the pipe joint can be reinstalled. The tube assembly should be retested after installation. As long as it is possible to repair, such as large diameter tubes used in the oil industry, the economic benefits are considerable. After the repair, the technical specifications of the tube manufacturer must be strictly adhered to and the inspection must be passed. If necessary, it should also include a tube electrical performance test under tube test pressure.
