Tee Bellows Rubber Expansion Joint Two Times Pressure Rating DN100-DN800 For Booster Pipeline

Booster stations are hard on flexible elements. Every pump start sends a pressure wave down the line, and a conventional joint sees that wave as a repeated test of its arch. This tee bellows design is built with a reinforced branch and a heavier carcass so the assembly carries twice the nominal pressure rating of a standard single sphere joint, giving the surge somewhere to go without stressing the rubber wall.

The tee configuration also lets the joint serve as a compact manifold take-off. Instead of a separate tee plus two flexible connectors, one fitting absorbs movement in both the run and the branch. That reduces the number of flanged joints in a tight pump room, which is where leak paths usually multiply. Typical sizes run from DN100 to DN800, matching booster and transfer station pipework.

• Two Times Pressure Rating: The reinforced carcass is rated at twice the nominal pressure of a standard joint, giving margin for pump start surge and water hammer.
• Tee Body Configuration: A single fitting handles run and branch movement, replacing a tee plus two separate flexible connectors in tight plant rooms.
• Fewer Flanged Joints: Reducing the number of bolted connections in a booster room lowers installation time and potential leak paths.
• Surge Absorption: The flexible branch and run cushion pressure waves before they reach anchors, valves and pump casings.
• Heavy Duty Carcass: Extra nylon plies and a heavier steel wire ring hold the arch under repeated pressure cycling.
• Serviceable Design: Bolted flanges at all three ends allow the joint to be removed and inspected without cutting pipe.

These joints are installed in booster pump rooms, pressure boosting sets for high rise buildings, transfer stations and district heating substations, where start and stop cycles are frequent. The tee format suits a pump discharge that must also feed a branch line to a second zone. Where pressure spikes are severe, the higher rating removes the need to upsize the whole pipeline just to protect one flexible element.

Each tee assembly is hydrostatically tested at 1.5 times its rated pressure before despatch, then crated with all three flange faces protected by plywood discs. The branch is braced inside the case so it cannot deflect during handling. Sea freight packing is a wooden case with desiccant, and the shipment includes the pressure test certificate, dimensional drawing and installation note on anchor placement.