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Insulating Joint

Insulating Joint is monolithic insulating joint with the sealing properties, strength properties required by the underground steel pipelines and insulating properties required by the electrical corrosion. It consists of assembly unit, insulating board, insulating sealing filler, seal ring, pups, etc.

Introduction

Introduction

Insulating Joint is monolithic insulating joint with the sealing properties, strength properties required by the underground steel pipelines and insulating properties required by the electrical corrosion. It consists of assembly unit, insulating board, insulating sealing filler, seal ring, pups, etc.

Zhengzhou Wanda Mac-Global Development Co., Ltd.

Parameter

Features of Structure

The insulating joint is monolithic type. It is the type of fixing the insulating board and insulating sealing filler into the assembly unit. After completion of assembling of the insulating joint, the internal components shall be fixed at the relevant positions. The whole insulating joint is in good condition under soil pressure, specified pipeline operating pressure and factory or field hydraulic test pressure. The sealing component contacts with the insulating board tightly inside the insulating joint and has everlasting elasticity. In addition, both sides of the sealing component contact directly with the naked surface of metal without moving, which ensure the compactness of the insulating joint.

 

Features of Product

1. Insulating Performance: insulation resistance ≥10MΩ (under 1000V DC)

2. Dielectric Strength: ≥5KV (DC, hold 60 seconds)

3. Applicable Temperature: -40℃—+100℃

4. Applicable Medium: gas, oil, water, chemical materials, etc.

 

Features of Material

Insulating Material: ASTM D709 G11

Flange Forging: ASTM694 F60,ASTM A694 F70,ASTM A694 F52, ASTM A105N, ASTM A350 LF2, etc.

Pup: API 5L GrB, API 5L Gr BNS,ASTM A 106B ,API 5L PSL2-X60M,API 5L PSL2-X52M, API 5L PSL2-X70,API 5L X70/X60/X52/X42, SA516 Gr70,SA516 Gr55,API 5L PSL2-X52NS,SA516 Gr60,SA516 Gr65,API 5L PSL2 –BNS ,etc.

Sealing Materials: O-shape or U-shape seal ring (VITON, nitrile butadiene rubber)

 

Design Code

ASME VIII Div-I App.2;ASME VIII Div-II App.2;ASME B 31.3;ASME B31.4; ASME B 31.8

 

On Field Handling and On Line Installation

Handling of heavy joints, by means of lifting device, shall be made with care for avoiding damages to coating. It is suggested wrapping and lifting the joint with suitable bands/ropes/belts (two at least: one for each pup) made of suitable and strong enough fabric and/or material that shall not cause any damages to coating.

Bevel ends for a length of 50mm. shall be preliminary cleaned, taking off the protective anticorrosion varnish. Joint internal surfaces shall be free from soil, dirt, dust deposits, humidity and others; proper check, removal and cleaning of internal surfaces are always a good practice.

 

Zhengzhou Wanda Mac-Global Development Co., Ltd.

Joint shall be positioned to perfectly align pipeline. Joint’s bending and/or rotation shall be avoided, especially if next to joints is forecasted installation of flanges and/or bends, It cannot be as compensation component in the pipeline.

 

Insulating Joint in service in the offshore pipeline

Zhengzhou Wanda Mac-Global Development Co., Ltd.

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