Application of cast iron pipe with fins
Cast iron ribbed pipeline products are intended for use in water or steam heating systems:
- industrial facilities;
- warehouses for various purposes;
- industrial premises and workshops;
- livestock complexes, etc.
These products can also be used for the installation of a heating system in residential premises (private houses) in the form of cast-iron radiators.
In heating systems, with the help of cast iron products, special registers are created from finned tubes. It is the use in compound registers that is the main purpose of cast iron ribbed products. Thanks to the ribs, which are cast in one piece with the pipe, the heat exchange area is significantly increased, which means that the efficiency of the heating system is greatly increased. A separate cast-iron pipe is also a heating radiator, therefore it is used both as part of registers and independently.
Polymer pipes for heating and water supply compared with steel pipes
The properties of various types of polymer products are similar in many respects: they are durable, not subject to corrosion, and do not overgrow inside. The service life of polymer pipes can reach 50 years, but largely depends on operating conditions.
A long period of operation of pipes at elevated temperatures is possible with 
no pressure in the system. The accident rate of steel pipelines due to the occurrence of corrosion processes and leaky connections leads to contamination of drinking water and the appearance of infectious diseases. In the case of using pipes made of polymers, the deterioration of the organoleptic characteristics of drinking water does not occur.
If we compare pipes for heating and water supply, then the advantageous characteristics of polymer pipes are as follows:
- The small weight of plastic pipes facilitates their transportation, loading and unloading and installation work.
- Due to the low thermal conductivity, polymer pipes for heating and water supply do not require such thermal insulation as steel pipes, in addition, moisture does not condense on the surface of plastic pipes.
Polymer pipes are good noise insulators for flowing water, and, moreover, regardless of the flow rate.
An important positive characteristic of polymer pipelines is their resistance to stray currents. Unlike polymer pipes, steel pipes are often damaged by stray currents, especially near stations and metro lines and other electric vehicles.
It is worth considering the fact that polymer pipes with their appearance are fully consistent with the modern design of residential premises and sanitary and hygienic rooms.
Features of Cast Iron Finned Economizer Tube
The heating pipe for industrial economizers can be rectangular and with round fins. The dimensions of the products are standard: the inner diameter is 70 mm, and the outer diameter is mm. Due to the differences between the outer and inner diameters, the effect of a low temperature of the pipe surface is achieved with a sufficiently hot coolant.
Economizer tubes are available in the same lengths: 2 m and 3 m. Cast iron finned tubes are available for sale with two perforated plugs and two blind plugs. Plugs with holes are left-handed and right-handed, and left-handed are marked with the designation "L".
There are certain operating conditions under which a cast-iron pipe with a ribbed surface will function as efficiently as possible:
- the highest temperature allowed for cast iron economizer pipes is 95 degrees. In emergency cases, a short-term rise in temperature to degrees is allowed;
- constant working pressure - 0, MPa (10 atmospheres). However, cast iron finned tubes are compatible with steam boilers whose pressure is maximum 2.4 MPa;
- the outer surface of the economizer is coated with a special primer;
- when installing finned tubes, the obligatory distance from the floor to the economizer median axis, which is at least mm, is taken into account. From the surface of the side wall, the distance to the axis of the pipe is taken into account from mm;
- if the economizers are arranged in two rows, the distance between the axes of the radiators is maintained in mm. Rows of economizers are interconnected by a special arc.
All economizer pipes are equipped with plugs - deaf and with holes.
The main disadvantages of economizer pipes are rather heavy weight, which makes transportation difficult, and low resistance to mechanical damage.
The nuances of choosing pipes with fins
How to choose finned tubes? When selecting for specific purposes, you should consider:
- material of manufacture;
- specifications;
What materials are finned tubes made of?
Pipes for the heat exchanger are:
- monometallic, made of one material;
- bimetallic, which are made of various alloys.
The bimetallic pipe has a number of advantages, since metal alloys complement each other with various properties.
Production is made from the following types of alloys:
- carbonaceous (St20 or St3);
- low-alloyed (for example, 09G2S);
- chromomolybdenum (for example, 12XM);
- chromium-molybdenum-vanadium (for example, 08X14MF);
- austenitic (for example, 12X18H10T).
Monometallic pipes made of brass, copper, cast iron and other materials are made exclusively by prior order. For example, cast iron finned tubes are often used in the construction of heating systems in industrial enterprises, as they have a higher strength index.
Cast iron pipes with fins
The manufacture of stiffeners is carried out:
- low alloy or carbon steel. Steel pipes are durable and have a long service life;
- copper. Finned copper pipes are able to withstand higher temperatures, but their cost does not justify the result;
- aluminum and other non-ferrous metals. Aluminum pipes are lightweight and are mainly used for industrial purposes.
Finned tubes made from different materials
Types of pipes and specifications
Manufacturers produce the following most common types of pipes:
- spirally ribbed;
- flat oval;
- heat resistant.
In this case, ribbing can be applied by the following methods:
knurled. As a rule, an aluminum pipe of obviously larger diameter is put on the main (carrier) pipe. Further, on special equipment, the outer tube is deformed and the ribs are made by extrusion;
Extruded pipes
winding. Steel, aluminum, copper, and so on, depending on the order, are “wound” onto the carrier pipe, the tape is welded.
Finned tube made by winding
A pipe manufactured using the knurling technology can withstand temperatures up to 350ºС, and a pipe manufactured using the winding technology can be used to transport media with temperatures above 350ºС.
Spiral finned tubes are considered to be completely finished after finning, as no further processing is required. The choice of spirally finned tubes is made according to the following technical characteristics:
- diameter - 2 - 24 mm;
- pipe wall thickness - 2 - 14 mm;
- length - 1.5 - 24 m;
- rib thickness - 0.8 - 2.6 mm;
- rib height - 8 - 26 mm;
- rib manufacturing step - 3.6 - 26 mm.
Main technical parameters of pipes with fins
Heat-resistant pipes undergo additional processing - they are covered with a special heat-resistant coating, which allows to increase the heat transfer rate by another 30% - 45%.
The technical characteristics of heat-resistant pipes are similar to those of spirally finned pipes, but due to the additional coating, it was possible to achieve not only an increased heat transfer coefficient, but also:
- higher resistance to the formation of corrosive deposits;
- longer (for 5 - 7 years) period of use;
- the possibility of using pipes in aggressive environments with different environmental conditions.
You can learn about flat-oval pipes by watching the video.
Finned tubes do not require special maintenance and can be used under any conditions.
Scope of application of cast iron economizer pipe
Ribbed cast-iron pipes are most widely used in the creation of heat exchangers for steam boilers - economizers (registers). But registers from economizer pipes are not the best option from the point of view of hygiene, since a large amount of dust accumulates between the ribs of the structure. Therefore, most often such structures can be found in industrial and warehouse premises, in which the working staff is a limited amount of time. Cast iron radiators in residential buildings are the prototype of industrial economizers.
Cylindrical pipes are not well suited as radiators, as they have insufficient internal volume in relation to surface area.
Heating stationary boilers can be non-boiling and boiling. There are also varieties with a chimney outlet used in residential buildings. The cast-iron economizer pipe is used only for non-boiling stationary boilers.
Economizer pipes are used to produce appliances for space heating; these devices are called registers
In addition to being a part of boiler equipment, ribbed tubes can be used as an independent element of the heating system.
The economizer pipe is connected to other sections using end flanges.
Area of use of finned tubes
The finned tube consists of several elements:
- carrier pipe, which is located inside. The main or carrier pipe is designed to transport liquids (gases and other working media). Differs in the high durability, resistance to differences of temperatures and pressure;
- ribs located along the perimeter of the carrier pipe. The main purpose of the fins is to transfer heat from the main pipe to the surrounding space.
The main components of the finned tube
Due to the double design, finned tubes offer a number of advantages over standard tubes. These include:
- increased (approximately 50%) heat transfer coefficient;
- resistance to corrosion;
- resistance to aggressive environments;
- non-susceptibility to high temperatures, temperature fluctuations and internal pressure;
- long period of operation;
- wide model range.
The main advantages determine the area of \u200b\u200buse. Finned tubes are used:
- in the chemical, petrochemical and oil refining industries. From pipes with fins, devices such as condensers, gas heaters, gas coolers, and so on are made;
- in mechanical engineering - they are used for the manufacture of compressor units, refrigeration units, oil coolers;
- in the nuclear industry - are used for the production of various types of coolers, as well as drying baths and steam air heaters;
- in the manufacture of air conditioning systems (condensers);
- in the manufacture of heat exchangers for space heating.
Register of a heating system from pipes with fins
The heating system from finned pipes can be made not only in industrial, but also in domestic premises, including country houses.
