How to perform hydraulic test after installation of rubber joints?

How to perform hydraulic test after installation of rubber joints?
Rubber joint is a hollow rubber product used for flexible connection between metal pipes. According to different connection methods, it can be divided into live flange type, fixed flange type and threaded type; according to the structure, it can be divided into five types: single ball, double ball, reducer, curved ball and wind pressure plate. The tubular rubber composed of inner rubber layer, outer rubber layer and outer rubber layer is loosely bonded to the metal flange or parallel joint.
Rubber joints have the function of damping vibration and noise, and can also compensate for thermal expansion and contraction caused by temperature changes, and are widely used in various piping systems. The flanges should be welded vertically before installation (Note: the flange waterline faces outward, and the installation distance of the large flap rubber joint should be reserved between the flanges). The flanges at both ends of the big flap rubber joint are connected to the pipe end flange with fasteners. Note: Use the diagonal method to press the nuts in parallel, do not press the deviation. After the installation is finished, perform hydraulic test on the big flap rubber joint. Partial leakage.
The installation length of the rubber joint should be calculated according to the outer side of the rubber sealing surface at both ends of the sphere, and the product flow direction is not restricted; it is forbidden to carry out hydraulic test when the connecting bolts of each component are not tightened; it is forbidden to open the connecting bolts between the large flanged rubber soft joint and the pipe during the test pressure and operation; it is forbidden to pre-tighten the device at a distance exceeding the natural length of the rubber joint. The pipeline needs fixed bracket or fixed bracket, and the force of fixed bracket should be greater than its axial force. When the product is installed vertically overhead, corresponding fixed brackets and force-bearing brackets need to be installed at both ends of the product to prevent pressure and tension from falling off.
Double ball rubber ball material: double ball rubber joint ball by the inner rubber layer, strengthening layer, multi-layer scratch nylon thread and outer rubber layer. Different media use different rubber materials, including natural rubber, butyl rubber, butyl rubber, nitrile rubber, EPDM rubber, neoprene, silicone rubber, fluorine rubber, etc. This product has the properties of heat resistance, acid resistance, alkali resistance, corrosion resistance, wear resistance, oil resistance, etc.