Vacuum Insulated Tubing-VIT

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.



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 level Heat conductivity coefficient A 0.06≤λ<0.08 B 0.04≤λ<0.06 C 0.02≤λ<0.04 D 0.006≤λ<0.02 E 0.002≤λ<0.006

B. VIT Specification Specification Basic parameter Outer tube OD x Inner Tube ID(in x in) Steel grade Connection Thread 3 1/2 x 2 3/8 N80 L80 P110   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 5BC 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, kN Normal temperature tensile load, kN Normal temperature tensile load, kN Flatness % Normal Temp. Gas injection Normal Temp. Gas injection                 YG88X50 0.002~0.02 ≥432 32 20 30 28 ≤0.2 YG114X62 0.002~0.02 ≥506 32 20 26 24 ≤0.2 YG114X76 0.002~0.02 ≥537 32 20 26 24 ≤0.2 YG127X62 0.002~0.02 ≥615 32 20 23 21 ≤0.2 YG127X76 0.002~0.02 ≥615 32 20 23 21 ≤0.2



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

Weight 100 kg


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