(i) Design drawings

There should be a complete design plan before construction, which should include the following information:

1, line number, power supply point with a long square.

2, the line of the required type and length of the Electric tropics. (Unit: M)

3, the length of the pipeline per metre of electric heating required length (unit: m) that is winding coefficient

4, each valve needs to use the tropical length of electricity. (Unit: M)

5. Accessory List of accessory materials for heating system.

6, Temperature control system Accessories list.

7, the construction of the required materials list.

8, design consideration parameters and the use of insulation material specifications.

(ii) preparatory work before construction

(A) Piping systems

1, piping systems and equipment have been completed construction.

2, Antirust anti-corrosion coating has been dry thoroughly.

3, piping system construction specifications and design drawings are consistent.

4. File all burrs and angles.

(B) Electric Tropics and accessories

1. Whether there is damage to the surface of the electric tropics.

2, the electric tape insulation performance is good (requires the use of shaking table in the 1000VDC test insulation resistance for ≥20mω).

3, the Electric Tropics and all parts of the model and design requirements are consistent.

(C) On-site preparation

1. Place a coil of electric tropics and reel on a bracket and place it near one end of the line.

2, along the pipeline to the heating of the tropics, and to avoid:

* Place the Electric tropics on the burr and the angle of interest.

* Pull the electricity tropics hard.

* Put on the electric belt with pedal or heavy weight.

(iii) A single electric-tropical construction method

1, glass fiber pressure sensitive tape or aluminum tape every about 50Cm will be fixed to the electric heating pipe.

2. As far as possible, the electric heating will be attached to the lower 45 degree side of the pipe.

3, in the line of the first power supply point and the end of each reserved 1m long electric belt.

4, as shown in the design diagram [winding coefficient] wiring (coefficient of integer should be flat to reduce contact).

5, all heat sinks (such as stent, valve, flange, etc.) should be in accordance with the requirements of the design plan required to reserve the length of the Electric tropics, this section of the electric tropical winding on the main body and fixed. The following points should be noted:

* Thermal body should be designed to the length of the electric tropical.

* The electric tropics may overlap or cross each other.

* Winding method should be as far as possible to remove the heatsink when necessary to repair or replace without damaging the electric tropics or affect other lines.

* In the use of two-pass or tee accessories, the electric tropics should be reserved 40cm length.

(d) Spiral winding

such as winding coefficient of 1.4, that is, 5m pipe need cloth 7m of the electric belt, the construction of the first 7m long electric belt fixed at both ends of a length of 5m pipeline, and then the relaxation of the electric tape winding in the pipeline, and fixed.

(v) Multi-root electric-tropical construction method

1. The design diagram indicates that the winding coefficient is (n=1,2). ) are generally used on large diameter pipelines, as follows:

* The Electric Tropics from one end of the pipeline wiring to the end of the end and then back to the starting point, the route equals coefficient. (but note maximum use length)

* The Electric Tropics by the pipeline line one end to the tail end turns the wiring number equal to the coefficient.

* back-up system, critical piping for back-up emergency. Therefore, each line should be installed independently of the line, and have a separate power point.