BIGGEST PWHT FURNACE IN NORTHERN EUROPE ?
Proper heat treating requires precise temperature control, and Sub Sea Construction has versatile heat treatment furnace that can accommodate steel components of various shapes and sizes. We stress relieve items from 20 meter in length, 6,5 meter width and 6,3 meter in height in one load.
Our furnace was originally built to conduct Post Weld Heat Treatment (PWHT) of scrubbers, atmospheric tanks, and pressure vessels but have been used for other equipment as well. The heat treatment furnace was originally built for internal use, however we have lately also offered Post Weld Heat Treatment for external customers.
The furnaces have fully calibrated controls and complete process data can be stored and printed from a computer program. The heat treatment furnace use propane and the load is placed on supports allowing for proper expansion and contraction during the heating cycle.
Our heat treatment furnace is ideal for stress relieving large and heavy welded objects such as pressure vessels and heavy-duty industrial steel structures. It can also be used by companies that need PWHT for power transmission equipment, industrial gearboxes, mining equipment, geared motors, gear sets and so on.
Key PWHT furnace features:
Size: L 20m, H 6.3m, W 6.3m
Temperature: Max 650 degrees
Crane capacity: 160te
40 pulse fire burners
Computer controlled for accuracy
Accurate distribution of heat
Easy temperature regulation
Rapid, efficient heating
Why Post Weld Heat Treatment?
Welding is an essential part of fabrication and maintaining equipment for the oil industry. The welding process can inadvertently weaken equipment by imparting residual stresses into a material, leading to reduced material properties. Changed material properties impact the equipment’s suitability for use.
Residual stress combined with load stress that exceed a material’s design limitations can lead to weld failures, cracking, and increased susceptibility to brittle fracture.In order to ensure the material properties of the equipment is retained after welding, a process known as Post Weld Heat Treatment (PWHT) is regularly performed.
PWHT is used to reduce residual stresses, as a method of hardness control, or even to enhance material strength. Sub Sea Construction have material and welding experts that can advise on the correct holding temperatures and PWHT based on the P-numbers of the material (based on alloy content) and in general the higher the carbon content of a material, the more likely it needs PWHT after welding activities have been conducted.
Effective heat transfer is the key to achieving desired properties such as tensile strength and hardness, and that means moving the work at the right time, into the right quenching, flowing in the right direction, at the right speed, at the right starting and finishing temperatures.