Vacuum Insulated Tubing-VIT


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Vacuum Insulated Tubing-VIT

Product Description

Vacuum insulated tubing uses water-based fiber cloth material with a three grade vacuum pump equipment,automatic welding machine and MT. These guarantees a high degree of vacuum level that meets the insulation grades D and E.

These vacuum insulated tubing use an effective getter to ensure the tubing insulation grade do not decrease after a long time of outdoor storage.  vacuum insulated tubing & casing are reusable. They retain desired insulation properties after being used several times. we are dedicated to the development of new products. Our products constitute almost 40% market share in Shengli Oilfield VIT market at the moment.

The pre-stressed insulated tubing is mainly consist of inner tube, outer tube, heat insulation material, coupling, etc. In its structure, put pre-stress on the inner tube to make up the different thermal elongation of the inner and outer tube. At normal temperature, the inner tube is in tension condition. When the temperature increases gradually, the tensile stress decreases. When the temperature increases constantly, the tension condition of the inner tube turns to its bearing condition. The pre-elongation of the inner tube decreases the  compression stress after the heated elongation. As a result, the insulated tubing run and maintain in good condition.

VIT Tubing API 5CT N80 88x50mm insulating D E

VIT Tubing API 5CT N80 88x50mm insulating D E

Key Feature

1.Insulated grade D and E.Advanced3-levelvacuum pump, automatic welding machine and online radiographic.

2.Long lifetime.Duringoutdoor storage, insulation level don’t reduce.

3.Inner tube and outer tube connections are both available.


A. VIT Performance Level

Heat-insulating property levelHeat conductivity coefficient

B. VIT Specification


Basic parameter

Outer tube OD x Inner Tube ID(in x in)

Steel grade



3 1/2 x 2 3/8




Inner connection

Outer connection

Extreme line connection

3 1/2 USS

4 1/2 x 2 7/8

4 1/2 BC

4 1/2 x 3 1/2

4 1/2 BC

5 x 3 1/2


5 1/2 x 4 1/2

5 1/2 BC

7 x 5 1/2

7 BC

C. Main Performance Parameters

C. Main Performance Parameters

Heat conductivity coefficient (Inner tube inside wall 350℃)  ,W/(m·℃)Normal temperature tensile load, kNNormal temperature tensile load, kNNormal temperature tensile load, kNFlatness %
Normal Temp.Gas injectionNormal Temp.Gas injection


Production Process

 VIT Tubing API 5CT N80 88x50mm insulating D EVIT Tubing API 5CT N80 88x50mm insulating D E


VIT Tubing API 5CT N80 88x50mm insulating D E
A.  X-ray flaw detection
X-ray flaw detection equipment carry out the testing on the welding seam to guarantee the welding effect and insulating capability.

B.  Heat conductivity coefficient test

VIT Tubing API 5CT N80 88x50mm insulating D E

Heat conductivity coefficient 100% test, record the performance parameter and the index curve for each piece of insulated tube.


Quality Control

VIT Tubing API 5CT N80 88x50mm insulating D E


VIT Tubing API 5CT N80 88x50mm insulating D E


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