Top Of Line Corrosion setup

Top Of Line Corrosion (TOL) occurs in multi-phase systems when the gas phase condensed on the top walls of the pipe. This is attributable to the exchange of heat between the pipe and the surrounding environment (river water, seawater or cold air), and this occurrence can worsen if the pipe is not separated or buried at a safe depth.

The top of the line corrosion setup (TOL) is a device to simulate the behavior of the pipeline top zone in the existence of the thermal gradient and in contact with the gas phase. For this purpose 4 samples are mounted in the top of the chamber in which the evaporated gas phase exists. During the test, the temperature of the chamber is increased, but the temperature on the top side of the coupon hold at room temperature via a cooling water circulation system. After the test period, the coupons are opened and the weight loss and corrosion type of the coupons are investigated.

Technical Specification

  • Ability to raise the chamber temperature up to 80° C with the help of a corrosion-resistant heating element.
  • The TOL testing machine has 5 coupon holders: four coupon holders at two different heights relative to the surface of the test fluid. These coupons prepare the ability to model the thermal gradient of the pipe via the cooling system. Beyond this, a submersible coupon is considered for comparison.
  • Transparent Plexiglas body with a complete gas and water sealing to provide the ability of gas purging in and above the test fluid.
  • Ability to simultaneously monitor and control the test fluid temperature, the air above the test fluid, and temperature of the cooling system.

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