| Type: | Hinged Expansion Joint |
| Size: | 66″ in diameter and 39-3/8″ OAL |
| Material: | Incoloy 825 / 321 stainless steel |
| Design | 73 PSIG at 986°F with 4.25 degrees of angular rotation |
| Testing: | Dye Penetrant, X-Ray, PMI, Hydrotest |
These single hinged expansion joints were custom designed by US Bellows for a chemical plant in Saudi Arabia. The units are 66″ in diameter and 39-3/8″ OAL. The bellows were fabricated from Incoloy 825 with the weld ends, hinges, liner, and cover from 321 stainless steel. The expansion joints were designed for an operating pressure of 73 PSIG at 986°F with 4.25 degrees of angular rotation. All units were dye-penetrant tested and x-ray tested on each bellows and pipe longitudinal weld seams, PMI tested on each alloy component, and ultrasonic tested on each alloy steel plate prior to shipment. Hinged pipe expansion joints also contain hinges or pivots which allow the unit to bend in a single plane.
We’ve supplied this type of expansion joint for both methanol and ammonia plants. They are also used in piping systems for air, steam, gas turbines, reformer ducts, and burners. These units are designed to restrict axial deflection in extension or compression. The hinge mechanism is typically designed to accept full-pressure thrust. Also, because of the hinge mechanism’s design, shear loads, such as from the weight of adjacent piping, can be accepted by this pipe expansion joint, relieving the piping designer of having to provide additional supports and anchors required by the single type.
PT&P REF. ORIGINAL POST 06182019