DIESEL CUTTING TORCH «DONMET» 185 (Diesel) «TRIDENT» series

CUTTING TORCH «DONMET» 185 (Diesel) is designed for oxy-diesel cutting up to 200mm of low-carbon and low-alloy steels in the presence of an oxygen source (oxygen line, manifold or cylinders) using diesel fuel.

 Torches are used for cutting with liquid fuels and oxygen.

           The choice of Diesel Technology for metal cutting works is preferable because diesel torches is safer than gasoline torches and about 70% more economical than acetylene.  Moreover, when cutting metal with thickness more than 50mm, the cutting speed is 25-30% higher than when using propane or acetylene as a fuel gas. Diesel cutting technology provides nearly 100% of oxidation, complete vaporization and combustion of diesel fuel during cutting, so little slag is left behind, and the cut is cleaner. Thanks to that, the Diesel cutting torch can be successfully used for Multi-layer cutting.

          To operate Diesel cutting torch DONMET you need standard compressed oxygen with Diesel as a fuel (instead of acetylene or propane). Ordinary diesel fuel is used as the fuel for Diesel Cutting Torches «DONMET» 185. You can buy it at every gas station.

The combustion of diesel fuel in oxygen gives a high-speed density flame, which cuts dirty and rusty metal, metal or reinforced concrete with voids, multiple stacked layers in a highly efficient manner.

Due to the unique design of the diesel cutting torch, the cutting flame is stable and does not change shape when tilted at any angle or spatial position, even when shaking the torch vigorously, the shape of the flame will not change.

The durable, reliable and long-life construction of the diesel torch DONMET 185 is ensured by the use of stainless steel and brass components.

The usual positioning of control valves allows you to set up and operate the diesel cutting torch DONMET like a traditional gas torch.

The special design of the preheating nozzle and mixing device provides 100% resistance to flashback. And for complete safety an oxygen flashback arrestor is installed at the inlet torch connection. In addition, diesel fuel is absolutely safe and stable in storage and operation: it cannot ignite or explode unless it is sprayed or vaporized.

The use of diesel fuel allows the cutting torch to be used at low temperatures from -40°C in the ambient air, while propane does not vaporize.

You can also buy a kit for oxy-diesel cutting: Petrogen type CUTTING KIT No.3 (Diesel fuel)

Not shipped to countries: Norway, Denmark, Sweden.
To order this product in the following countries, please contact our representative in your region:
+0046 705 36 81 97
info@donmet.se

TECHNICAL SPECIFICATIONS OF THE DIESEL CUTTING TORCH DONMET 185 DG

DELIVERY SET

SPARE PARTS (as per customer’s order)

DESIGN AND PRINCIPLE OF OPERATION 

The cutting torch consists of: a shank with locking valves, cutting oxygen tube, oxygen collector, diesel collector with a mixing unit, cutting torch head  with a preheating nozzle and a cutting nozzle. There is a flashback arrestor is installed at the oxygen inlet connection.

Oxygen is delivered into the cutting torch through the oxygen inlet connection with the thread 9/16-18. Under the impact of the flow the valve slide overcomes the spring strain and opens the passage for oxygen. Then the flow divides into two streams: one is headed to the cutting oxygen valve, the second – to the mixing device through the valve of the heating oxygen. The preheating oxygen comes to the mixing device through an annular gap between the oxygen collector and the diesel collector.

Diesel fuel is delivered to the cutting torch through a connection unit with thread 9/16-18LH and further through the liquid fuel valve and a diesel collector to the metering orifice of the mixing device.

The cutting torch operates on the principle of pump injection of liquid fuel with oxygen jets and the subsequent evaporation of the air-oil mist in heated spaces and preheating oxygen channels. The preheating nozzle is heated due to the cutting nozzle end face being countersunk with the preheating nozzle end face. When the air-oil mist is burnt at the cutting nozzle end, it heats the preheating nozzle.

The supply of oxygen to the axial hole of nozzle is carried out by a lever.

OPERATING INSTRUCTIONS

Before putting the diesel cutting torch into operation make sure it functions properly and check the tightness of hose connections, all detachable and soldered joints.

When starting the cutting torch, follow the instructions:

– close all cutting torch valves;

– adjust the oxygen and diesel pressure according to table 1;

– blow out the cutting and preheating oxygen channels with the liquid fuel valve closed;

– open the preheating oxygen valve all the way;

– with the cutting torch positioned head up, open the liquid fuel valve and keep it that way until there appears some air-oil mist (aerosole) from the nozzle. There should be no big drops or free flow of the liquid fuel in the aerosole;

– ignite the aerosole keeping the cutting torch in a working position;

– during heating the yellow patches of light in the flame get smaller. Otherwise reduce the fuel supply with the valve. Do not minimize the amount of fuel in the aerosole. Remember that the heat for heating up the nozzle and evaporating the aerosole is generated through burning of liquid fuel;

Warning! It takes 30 seconds to build up the temperature to vaporize the fuel off a burning flame. The minimum system readiness time is achieved when the preheating nozzle is heated with a preheating flame reflected from a barrier (an angle, a refractory, a plate – any obstruction to put the preheating flame in contact with the preheating nozzle side walls). After the initial heating, the temperature is kept up automatically.

• when there are no more yellow specks in the flame, perform the final adjustment of the mixture with a cutting oxygen jet;

Warning! Do not allow the cutting torch final adjustment with the flame core burning inside the preheating nozzle, this leads to its overheating. With proper adjustment the preheating flame core should overlap the preheating nozzle end by 5-7 mm. (For cutting nozzles No.0 and No.1 the flame core should protrude by 3-5 mm).

–  After works termination turn off the cutting torch by first closing the liquid fuel valve and then, after 5-10 seconds, the preheating oxygen valve to prevent carbon formations on the cutting torch.

After works termination and during operation intervals it is necessary to place the cutting torch with the head inclined downwards to prevent fuel from flowing into the oxygen channels.

Remove scale from nozzle surfaces in proper time. Use acetone to dissolve sludgy deposits.

Warning! The preheating nozzle is a combined single-block item, the two component parts being screwed together and soldered. To remove the sludgy deposit inside the preheating nozzle take it off the cutting torch and then bring it to red heat using a welding torch. The heating temperature should not exceed the solder’s melting temperature. Let the cutting torch cool down, then blow out its internal passages.

During operation make sure that there are no leaks at the points connecting the head and the nozzles.

To increase the product service life it is recommended to perform maintenance works once in three months. Checkups must be conducted for: 1) air-tightness of the joints, channels, sealers and arrestors; 2) lack of jam-ups and screws of the valve slide in the oxygen connection arrestor, 3) burning with a cutting oxygen flame jet.