PETROCHEMICAL & REFINERIES

The petrochemical industry uses petroleum and natural gas based feedstocks such as naphtha, LPG, gas oil to produce plastics, rubber and fiber raw materials and other intermediates which are consumed by several sectors such as packaging, electronics, automotive, construction, textile and agriculture.

Ayvaz produces all type of refractory lined expansion joints including gimbal, universal tied or pantographic linked types for FCCU systems.

Cold Wall expansion joints are refractory lined to ensure the outside wall temperature does not exceed the maximum. The wall is made from stainless steels and the lining is designed inside of the expansion joint. Hot Wall expansion joints are designed with the refractory lining on the inside as a thermal barrier. The purpose of the lining is to withstand abrasion from the catalyst flow medium.

The expansion joint is a key component in this application because of critical operating conditions, and the selection of bellows material is very important. Double ply or redundant ply bellows are commonly utilized for FCCU applications. The simple double ply bellows utilizes the strength of both plies to withstand the operation conditions, and the redundant ply bellows are designed to let each ply take up the full load. So, if the inner ply is leaking, the outer ply will be able to take up the load and continuously operate without failure.