Corrosion-Resistant Heat Tracing Sampling Composite Pipe
1. Product introduction of Corrosion-Resistant Heat Tracing Sampling Composite Pipe
Corrosion-resistant and heat-tracing sampling composite pipe is an important component in environmental monitoring system. It is composed of a group of corrosion-resistant and high-performance resin pipes, self-limiting temperature tracing (constant power tracing) and compensation cables, an external insulation layer, and finally a flame-retardant polyethylene (PE) protective jacket. The automatic temperature limiting function of the self-limiting heating tracing belt can ensure that a certain temperature is maintained in the sampling tube, so as to ensure that the collected samples are consistent with the initial values as much as possible, and finally ensure that the environmental monitoring system collects the sample gas continuously and correctly. According to the actual conditions such as the composition and temperature of the sample gas, the sampling pipes in the corrosion-resistant heat tracing sampling composite pipe can be made of different materials, such as PFA (copolymer of tetrafluoroethylene and perfluoroalkyl ether), FEP (copolymer of tetrafluoroethylene and hexafluoropropylene), PVDF (polyvinylidene fluoride), PE (flame retardant polyethylene), nylon 610, etc., and the heat tracing belts can be selected at medium, low and high temperatures, in addition, according to users. This product was listed as the national key new product promotion plan in 2002, and declared the national patent in 2001. At present, the company is one of the professional manufacturers of this kind of sampling tube.
Corrosion-resistant and heat-tracing sampling composite pipe is a complex composed of many devices, and several systems are combined on a limited section.
● Sampling system: sampling tubes of various types and materials can be combined: Teflon PFA, FEP, nylon 610, copper tube, 316SS, 304SS, etc.
● Thermal system: efficient thermal insulation, flame retardant and lightweight insulation layer; Automatic temperature limiting heat tracing cable or constant power heat tracing cable.
● Electrical system: instrument signal cable, compensation cable and control cable can be equipped to meet the needs of instrument display and monitoring.
● Safety system: According to different technological conditions, all systems are shielded and isolated with aluminum foil or wire mesh to achieve the functions of fire safety, anti-static and electromagnetic shielding, and some systems are equipped with waterproof films and sheaths to enhance flame retardancy and ultraviolet protection. The combination of multiple systems, integrating multiple functions, simplifies complicated projects. It plays a good role in ensuring remote work and remote diagnosis of the system. The heat tracing system keeps the gas in the pipe from condensing and measuring above the dew point, so the measurement accuracy can be guaranteed, which creates conditions for computerization of central centralized control. The reinforced outer sheath can prevent cross and damage caused by other factors.
2. Basic structure, classification and model of Corrosion-Resistant Heat Tracing Sampling Composite Pipe
2.1 Basic structure
The basic structure of composite pipe is shown in Figure 1.
1-outer sheath
2-insulation layer
3-Sampling tube D1
4-power cord
5-Heat tracing cable
6-Sampling tube D2
7-conductor
8-shielding reflective film
9-Compensation cable
Figure 1 Basic structure diagram
2.2 classification
2.2.1 According to the type of heat tracing cable, it can be divided into:
A) Self-temperature-limiting electric heat tracing composite pipe;
B) constant power electric tracing composite pipe.
2.2.2 According to the different sampling tube materials, it can be divided into:
A) polyvinylidene fluoride (PVDF) composite pipe;
B) Polyperfluoroethylene propylene (FEP) composite pipe;
C) soluble polytetrafluoroethylene (PFA) composite pipe;
D) polytetrafluoroethylene (ivory PTFE) composite pipe;
E) stainless steel (0Cr17Ni12Mo2) composite pipe.
2.3 model
2.3.1 The model compilation of composite pipe products shall at least include the following contents:
A) Nominal outside diameter, in millimeters (mm);
B) Outside diameter of sampling tube, in millimeters (mm);
C) Number of sampling tubes;
D) sampling tube material;
E) Operating temperature (℃);
F) Types of heat tracing cables, including self-limiting temperature electric heat tracing and constant power electric heat tracing.
3. The model representation of composite pipe is as follows:
Introduction of typical models
Example 1: The model number is FHG36-8-b-120-Z, which means that the nominal outer diameter is 36 mm, the outer diameter of the sampling tube is 8 mm, the number is 1, the material is perfluoroethylene propylene (FEP), the working temperature in the sampling tube is 120℃, and the heat tracing cable is a self-limiting composite tube.
Example 2: The model number is FHG42-10(2)-c-180-H, indicating that the nominal outer diameter is 42 mm, the outer diameter of the sampling tube is 10 mm, the number is 2, the material is soluble polytetrafluoroethylene (PFA), the working temperature in the sampling tube is 180℃, and the heating cable is a constant power composite tube.
Example 3: The model number is FHG42-8-6(2)-c-200-H, indicating that the nominal outer diameter is 42 mm, the outer diameter of sampling tube d1 is 8 mm, and the number of sampling tube d2 is 6 mm, and the sampling tube is made of soluble polytetrafluoroethylene (PFA), the working temperature in the sampling tube is 200℃, and the heat tracing cable is a constant power composite tube.
Example 4: The model number is FHG45-8(2)-6(2)-f-250-H, indicating that the nominal outer diameter is 45 mm, the outer diameter of sampling tube d1 is 8 mm, and the number is 2, and the outer diameter of sampling tube d2 is 6 mm, and the sampling tube is made of stainless steel (0Cr17Ni12Mo2), and the working temperature in the sampling tube is 250℃, with heat tracing.
Heat Tracing Sampling Composite Pipe
