-
About Huafu
-
-
PRODUCT INTRODUCTION
Pipeline SECT (heating) technology is a new metal pipeline heating method that appeared in the middle of the last century. It is a new technology and process for the heating and thermal insulation of heated transmission pipelines of large petrochemical enterprises, which is suitable for the heat tracing and heating of all long, medium and short distance metal liquid transmission pipelines, featuring high efficiency, safety, high reliability, and convenient installation and maintenance. Therefore, it is widely used in the pipeline transportation of various liquids with different properties.
- FEATURES & BENEFITS
- HOW IT WORKS
- TECHNICAL INFORMATION
-
- Commodity name: Pipeline SECT technology
- Commodity ID: z101
- 副标题: PRODUCT INTRODUCTION
Pipeline SECT (heating) technology is a new metal pipeline heating method that appeared in the middle of the last century. It is a new technology and process for the heating and thermal insulation of heated transmission pipelines of large petrochemical enterprises, which is suitable for the heat tracing and heating of all long, medium and short distance metal liquid transmission pipelines, featuring high efficiency, safety, high reliability, and convenient installation and maintenance. Therefore, it is widely used in the pipeline transportation of various liquids with different properties.
FEATURES & BENEFITS
High adaptability
It is adaptable to the heat tracing and heating of all long, medium and short distance metal liquid transmission pipelines, and applicable to different laying methods of pipelines (such as underground direct burial, underwater or aboveground overhead) and any locations (such as fields, mines, factories and flammable and explosive locations).
Wide application
It is applicable to the transportation of a medium which solidifies at normal temperature but melts after being heated (such as chocolate and milk), and the pipeline transportation of a substance which is difficult to flow due to high viscosity at normal temperature but easy to flow after being heated (such as heavy oil, high pour point oil, fuel heavy oil, coal tar and wax).
It is applicable to a pipeline requiring isothermal heat tracing, such as a medium with long transportation distance and low leaving temperature.
It is applicable to an intermittently transported medium with high freezing point or viscosity. In the case of the intermittent tank truck or ship loading at a dock, pipeline can be restarted directly without purging.
High power density and heat tracing temperature
SECT system can effectively maintain a temperature up to 230 °C, and the maximum heating capacity of a single tubing is 150 W/m. The piece number of heat tracing tubing and running voltage can be designed according to the temperature requirements of the liquid transmission pipe, and a maximum of 6 pieces of heat tracing tubing can be installed.
Easy maintenance due to sectional or overall prefabrication
Depending on the process flow or the structure of liquid transmission pipe section, the heat tracing tubing can be prefabricated entirely in plant or section by section at site. Alternatively, the heat tracing cable and tubing can be prefabricated into a coiled tubing sheathed cable, with the joints connected by welded sleeves and welded or bound onto oil pipe. Thermal insulation layer and protective cladding are provided outside, which is convenient for construction and easy for quality assurance. In case of pipe section failure or valve replacement, it is only necessary to disconnect or cut off the joints at both ends of the part to be replaced, and there is no need to remove the entire thermal insulation layer and all pipe fittings.
Safety and reliability
Special cables are used for heat tracing. Due to the insulation structure formed by the skin effect system itself, the external surface of heat tracing tubing and the liquid transmission pipe are not charged. The liquid transmission pipe is grounded safely every kilometer or so, and the grounding resistance is not greater than 4 Ω, which ensure that the liquid transmission pipe always has a zero potential, and is safe and reliable.
Energy conservation and high heating efficiency
SECT is an isothermal heating method, and local overheating will not occur. With the increase in pipeline transmission distance, the heating voltage can be increased, and the heating efficiency is high.
Automatic control
-
HOW IT WORKS
- Heat tracing cable 2. Terminal/junction box 3. Liquid ransmission pipe
- 4. Thermal insulation 5. Cladding 6. Heat tracing tubing
- 7. Tail junction box Ends a and b are for power supply connection, and end c is for grounding
When alternating current passes through the heat tracing tubing wall through the cable, under the action of skin and proximity effects, the current does not flow uniformly along the tubing wall, but flows concentratedly on the inner surface of the heat tracing pipe. Under the action of tubing wall resistance, the passing current produces heat, and makes the temperature of liquid transmission pipe rise through conduction, while the voltage and current on the outer surface of the heat tracing tubing are zero, forming an insulation structure by itself. Thus, the liquid is safely and reliably transported in the pipe
The injection tools and equipment for injection under pressure in a flowing well comprises a winch of coiled tubing sheathed cable, a well control unit, an injection unit of coiled tubing sheathed cable and hanging and sealing device of wellhead cable.
Reliable grounding is provided at the end and in the middle of the heat tracing tubing to prevent the generation of static or induced electricity. SECT and cathodic protection can be provided for pipelines simultaneously.
This technology can also be understood in this way: When alternating current passes through the cable and heat tracing tubing, magnetic flux is generated in the heat tracing tubing, and eddy current is generated under the action of alternating magnetic flux. The directions of circuit current I1 and I2 and eddy current I3 and I4 are shown in the figure. If the effect of magnetic flux leakage is ignored, I2=I4, but the directions are opposite and offset each other. In fact, there is only current I1 and I3 acting on the heating cable and hollow sucker rod.
The skin effect brings two benefits. One is to reduce the cross-sectional area of the current passing through the steel pipe and increase the AC impedance. Therefore, a greater heating power can be obtained with a smaller heating current. The other is that there is only leakage voltage and current on the outer surface of the heat tracing tubing, and so the heating system is very safe.
-
TECHNICAL INFORMATION
Pipeline SECT technology device mainly consists of a transformer, a heating power control unit, liquid transmission pipe, heat tracing tubing and cable, thermal insulation layer and protective cladding. The heat tracing tubing is coiled steel tubing bound onto the outside or injected into the inside of the liquid transmission pipe. The heat tracing cable (single-core) is prefabricated into the heat tracing tubing, with the thermal insulation layer and protective cladding provided outside. The heat tracing cable is single cored, which adopts the form of copper core wire wrapped with insulation and sheath. According to the requirements for medium transmission temperature and heat generation, the temperature rating of insulation and sheath is determined.
The power supply transformer mainly adopts the form of 3P-to-2P or 3P-to-3P. A 3P-to-2P transformer supplies power to 2 (or a multiple of 2) pieces of heat tracing tubing, and a 3P-to-3P transformer supplies power to 3 (or a multiple of 3) pieces of heat tracing tubing. Multiple pieces of heat tracing tubing shall be powered up simultaneously to ensure three-phase equilibrium. According to the actual situation and user needs, power supply can be provided at both ends or in the middle of the heat tracing tubing.
RELATED PRODUCTS
Electric heating technology to remove paraffin and reduce the viscosity of oil is to run heating cable (coiled tubing sheathed cable or rubber insulated cable) into the tubing or hollow sucker rod (with a hollow section at the upper part). The system is powered from the surface. Under the effects of skin effect and proximity, the coiled tubing sheathed cable or hollow sucker rod becomes heated to improve the temperatures of fluid flow and wellbore equipment. For a well having the problem of precipitated paraffin, the paraffin can be melted by heating, and then removed and controlled. Thus, oil heating and paraffin removal and control are realized in the process of lifting. Depending on the situation of paraffin precipitation in wellbore and the change in oil production, timing for powering up cable to remove paraffin can be selected. Meanwhile, the recovery of production is observed to determined the paraffin removal effect. Running of the electric heating system shall be stopped immediately after the expected effect is achieved. In this way, continuous or intermittent paraffin removal is realized. For a heavy oil well, heating reduces the viscosity of heavy oil to improve its fluidity, realizing the purpose of continuous production. This technology is widely applicable to various rod wells, rodless wells or flowing wells.
VIEW ALL PRODUCTS
Mobile electric ignition system and operation equipment
A mobile electric ignition system comprises a central electric heater connected to the lower part of an equal-diameter coiled tubing sheathed cable. A coiled tubing conveyed igniter is lowered to the target layer in the wellbore to heat the perforated interval by using coiled tubing operation equipment, so that temperature of the near-wellbore zone of the well section rise to over the spontaneous combustion point of the combustible medium in the oil layer.
VIEW ALL PRODUCTS
Coiled tubing sheathed heating cable
After an oxygen-free copper rod is drawn and straightened, insulating and packing layers are mechanically wound, which is then subjected to sintering in an electric furnace to make the insulating layer integrated. After being pulled through a tubing, welded and drawn, the cable is made. The cable section is shown in the lower right figure. Because steel tubing is used as the sheath, the easily damaged surface is completely protected.
VIEW ALL PRODUCTSPARTS & SERVICES
Huafu offers its customers a complete life cycle support for its products, equipment and solutions.
LEARN MORE
-
We are your water treatment partner,
enhancing the value of water through innovation, -
creativity and expertise.
Huafu
About Group
enterprise