How to saw a cast iron sewer pipe
Most often the need to cut a cast iron structure occurs when dismantling outdated utilities. The hope for a speedy completion of the work collapses immediately. in the Soviet Union, pipes were joined by cement, sulfur and aluminum, so it is incredibly difficult to cut them. But a couple of working techniques are known. About what to cut cast iron and structures from it, you will learn from the material below.
As with any metal, methods of cutting cast iron are divided into thermal and mechanical. The choice of a particular tool depends on the features of the construction. Below is the equipment that saws (or cuts) cast iron:
Now it is worth evaluating the cutting with the mentioned tools with cast iron objects.
Causes of cutting a gas pipe
The most common motive. carrying out repairs, during which the decision is made to change the position of the stove or install new equipment. All of this can encourage owners to shorten the gas pipe.
In addition, the initiator can be a representative of the gas company, on legal grounds requiring the removal of the device in the sight of the.
In older homes, you can see the following picture: the branch from the gas pipe interferes with the convenient location of curtains or kitchen set modules. This is also often the cause of the cut
It may also need to be shortened due to the non-compliance of outdated communications with modern rules. Standards are regularly updated, and homeowners very rarely keep track of the changes on their own.
How to cut a pipe, several methods, what tool is needed.
There are several ways to cut a pipe. It all depends on the diameter, the material from which it is made and the tools you have at hand.
Using a pipe cutter. If the pipe is small in diameter and made of non-ferrous metal, you can use a pipe cutter. The maximum diameter of the pipe that can be cut with such a tool is 50mm. The advantage of using it is that the cut is very smooth and accurate.
If you have a steel pipe, you need a pipe cutter powerful enough, for non-ferrous metals it will not be relevant. It looks much more dimensional, it is noticeably heavier. The principle of operation of pipe cutters is similar to that of a pickle jar lathe. There is a tungsten carbide roller that turns up as you cut through the pipe. First you make one or two revolutions around the pipe, then you twist the roller, make several more revolutions, and so on, until the cut is complete. Over time, the roller can blunt, it will have to replace it, as a rule, the set has a spare. There is a disadvantage of using the pipe cutter, it can not be used when the pipe is close to the wall and there is no opportunity to remove it. In such a case it is impossible to twist the pipe cutter.
Using an angle grinder (angle grinder). If you have this tool, you can use it. Metal cutting disc is needed. The main thing when cutting do not press much, do it accurately, you can even make a marking on the pipe for a more accurate cut. Suitable as a small and large angle grinder, any power.
Using a hacksaw for metal. The most inexpensive method, but the most time-consuming. Metal is enough to saw slowly. It is important not to overheat the blade on metal, to make breaks, about every minute of work with a hacksaw, otherwise the blade can break.
For plastic-Metal piping, the pipe cutter is best suited. The maximum diameter of the cut pipe is 38mm.
You can also use a hacksaw and angle grinder for absolutely different tasks like sawing off the lock, etc.
All these tools are readily available in construction stores or online with delivery.
The use of thermal methods
In addition to mechanical methods, thermal methods, which use welding or cutting equipment as a tool are often used. For example, an autogenous gas torch or a conventional welding machine (DC/AC).
Thick-walled metal pipes can be cut with these devices. However, it is extremely difficult to obtain a perfectly even quality cut by electric welding or gas autogenous welding.
Cutting with electric welding and autogenous flame cutting is a widespread technology. The technique does not provide a very precise cut, but this is often not a decisive factor in pipe installations
Cutting with electric welding and autogenous torches is common throughout the world. The technique does not provide a very precise cut, but this is often not a decisive factor in pipe installations
Usually, after a thermal cutting process, the products undergo additional processing. The line for the cut trimmer is aligned, the values of the required angle are adjusted. This approach is economically disadvantageous, since it is accompanied by additional costs for machining.
As a rule, thermal cutting technique is used in industrial environment. It’s true that utilities often use this technique, too.
Thermal cutting is also used for plastic material. There are devices. thermal guillotines. The sharp and thin blade of such devices is heated up to a high temperature, after which the cut is performed.
Thermal guillotines support cutting at an angle, and that’s their advantage. However, these devices cannot be used for tougher materials than PVC, wood, chipboard.
For cutting metal-plastic pipes, you need pipe cutters that can evenly divide into parts of products with a multi-layer structure. Their varieties and applications are described in our recommended article.
Using thermal techniques
In addition to mechanical methods, thermal methods are often used, with welding or cutting machines as tools. E.g. an autogenous gas torch or a conventional welding machine (DC/AC).
Thick walled metal pipe can be cut with these machines. However, it is extremely difficult to obtain a perfectly even qualitative cut with electric welding or a gas autogenous gas furnace.
Cutting with electric welding and an autogenous gas furnace is a widespread technology. The technique does not offer a high accuracy of cut, but this is often not a decisive factor when mounting pipes
Cutting with electric welding and autogenous torches is a ubiquitous process. The technique does not provide a high precision cut, but it is often not a decisive factor when mounting pipes
Usually, after thermal cutting, the workpieces undergo additional processing. Aligning the line for the cut trimmer, adjusting the values of the required angle. This approach is economically unprofitable, as it is accompanied by additional costs for machining.
As a rule, a thermal cutting technique is used in an industrial environment. It’s true that building services often use this technique, too.
Thermal cutting is also used for working with plastic material. There are devices. thermal guillotines. The sharp thin blade of such devices is heated to a high temperature, after which the cut is performed.
Thermal guillotines support cutting at an angle, and this is their advantage. But they cannot be used for tougher materials, such as PVC, wood, or chipboard.
To cut metal-plastic pipes, you need pipe cutters that can evenly divide into parts of products with a multi-layer structure. The article we recommend is devoted to their varieties and methods of application.
What to watch out for when buying
Choosing a device for a particular work activity, can not always be called an easy task. In the market of construction equipment there is a huge number of products for cutting pipes, different brands and manufacturers. So sometimes it is difficult to stop your choice on a specific model of the tool without deciding on the following parameters:
- The required quality of cutting, which is set by the job specification. Qualitative indicators include the presence of burrs on the ends of the workpiece, surface roughness, the degree of melting of the cutting edges.
- The volume of parts depends on the speed of cutting, which the tool is able to perform.
- Basic parameters of the workpieces.
- The skills of the operator to perform the cutting.
Remember that you have to be serious when choosing a tool because it is bought for a long time. When buying a device for cutting the price factor can not be given decisive importance, the main thing is that the equipment, which is to work, is fully consistent with the purpose of the purchase.
How to properly cut plastic pipe?
Cutting plastic pipes requires experience. Only after cutting several tens of meters of material does confidence appear in your hands, and the movements are brought to automatism.
In the business of cutting pipes the golden rule applies: “Measure 7 times, cut once”. It is better to spend an extra 30 seconds to verify the accuracy of the mark than to spoil the material with a poor cut
To get two pipes from one, you need to do the following steps in sequence:
- Mark where the cut should be made. It is important that the mark is strictly across the pipe, not at an angle. Then the blade will pass perpendicularly.
- Clamp the pipe with the pipe cutter clamp. Some models grip the part with a spring, others are installed by lowering the rod, and some just need to lay the material, and you will need to hold it with your hands.
- Make sure that the mark is exactly the same as the blade. If it is a roller pipe cutter, it makes sense to do the first turn of the tool to check the accuracy of the installation.
- Cut the pipe: close the ends of the scissor handle, pull the trigger, lower the guillotine rod or make several revolutions of the roller tool. it all depends on the selected model of pipe cutter.
The distinctive feature of cutting metal plastic pipes, compared to the cutting of polypropylene products, is that the accuracy in this case is very important. The polypropylene pipe will be connected with the help of high temperature, the plastic will melt a little and thus hide all the possible inaccuracies.
But this will not be the case with metal plastic pipes. The ends are mounted in special collars and every mm of discrepancy threatens a loose fit and the emergence of leaks. Detailed instructions for installation of metal plastic pipes we have given in the following article.
After the cut, you need to blow out the resulting segment. The chips of aluminum or plastic left inside the pipe after installing the whole system can disable the equipment that is connected to the pipe or cause a clog.
Working with pipe cutters
Regardless of the type of pipe cutter, they are used in much the same way. The first thing to do on the pipe is to mark the place of the cut. If iron pipe is cut with a hydraulic, manual or pneumatic tool, then the cutting area before the work is wet with water. This allows the steel pipe cutter to slide better over the material to be cut, and there will be no unpleasant grinding during operation.
It is undesirable to use oil and other grease because it will affect the subsequent welding of pipes and will not allow to properly apply protective painting materials.
After marking the pipe, which must be welded to the laid pipeline, or well clamped in the cramps, the pipe cutter is installed on it. Then set the cutting element of the tool precisely on the cutting line for the trimmer and tighten the clamp with a lever or with a screw mechanism.
Particulars of using the tools
If the pipe is cut with a pneumatic or hydraulic pipe cutter, the air or fluid pressure is used to crimp the cut pipe. To do this, press a button on the compressor or hydraulic pump.
If you use a manual hydraulic pipe cutter, you must apply pressure to the pipe with a crank on the hydraulic pump. Then turn the tool several times around the pipe and press the squeezing mechanism harder against its surface. The operation is then repeated. As a result of the gradual penetration of the cutting rollers into the pipe wall, the pipe is completely cut into two parts.
The working principle of electrically powered pipe cutters is different. you do not need to wet the pipe after marking it. They are simply mounted on the pipe and clamped with a clamp. Then start the electric motor, which drives the cutting disk. It cuts through the wall at the point of contact, and then the tool is gradually moved in a circle until it completely cuts through the pipe.
The main difference in the work of electric models from other pipe cutters is that they cut the pipe in one turn.
When working with guillotine type tools, it is necessary to set them on a fishing line to trim the cut and ensure good squeezing of the pipe without rotary movements. Do not forget that this equipment is designed only for plastic and metal-plastic products.
When working with pipe cutters the main thing is not to rush. Increase the compression force on the cutting elements must be gradually, regardless of the type of equipment used. This will protect it from premature breakage, as well as obtain a better cut without burrs and dents.