An in-line pressure balanced Expansion Joint is designed to absorb axial movement and/or lateral deflection while restraining the pressure thrust by means of tie devices interconnecting the line bellows with outboard compensating bellows also subjected to line pressure.

Each bellows set is designed to absorb the axial movement and usually the line bellows will absorb the lateral deflection. This type of Expansion Joint is used in a straight run of piping.

Above figure shows the use of an in-line pressure balanced Expansion Joints to absorb axial pipe line movements in a long, straight piping run. By utilizing this arrangement the two anchors shown are relieved of pressure loading and are designed as intermediate anchors. Since the piping is relieved of compressive pressure loading, a minimum of guiding is required, primarily to direct the thermal expansion of the piping into the Expansion Joints in an axial direction.

BELLOWS DESIGN
Bellows of pressure balanced expansion joints are designed according to EJMA 10 code. For high pressure applications multi layered bellows with reinforcing rings. According to the requested features like type of transported media, spring rate values (axial, lateral, angular) or operation temperature, pressure & life cycle bellows material could be customized.

CONSTRUCTION
Expansion Joints are the parts of pip­ing system of pressurized equip­ment. In this respect construction of the expansion joints are designed and produced according to European pressurized equipment directive (PED 2014/68/EU) as well as American Nation­al Standard for piping process ASME Section VIII Div 1&2, ASME B 31.3.

All components of the expansion joints like, pipes, caps, flanges, tie rods etc… are checked by piping stress ana­lysis thus enable us to se­lect material type & thickness accord­ing to permissible stress values.

GENERAL CAPABILITY RANGE FOR AYVAZ EXPANSION JOINTS
• Dimension: DN 15-6000
• Design pressure: Up to 150 bar (de­pending on the diameter and tem­perature)
• Lifting capacity: Up to 16 ton

TEST&CERTIFICATION
• Expansion Joints are the parts of piping system of pressurized equipment in this respect construction of the expansion joints are designed and produced according to PED 2014/68/EU&ASME U Stamp-U2 Stamp.
• Expansion joints are exposed to hydrostatic pressure at 1,5 times of design pressure.
• For full vacuum applications, vacuum test at 760 Hg/mm is also applicable.
• Additionally, gas leakage detection with helium is advised for proper tightness.