Characteristics and features of oxygen hoses for torch

Oxygen hose for gas cutting and welding GOST 9356-75

A rubber pressure hose, intended for gas cutting and gas welding work, is manufactured in accordance with the requirements of GOST 9356-75 and is often called an oxygen hose. The product is designed to supply working gas under pressure (this can be acetylene, natural gas, butane, propane, oxygen, and liquid fuel) to equipment used for gas cutting and welding. According to GOST 9356-75, the operation of oxygen hoses is possible in cold, temperate and tropical areas. The operating temperature range is determined by the climatic version - from –55 to +70 °C (cold and moderate) and from –35 to +70 °C (tropical).

The classification of oxygen gas welding hoses is based on their purpose and scope of application:

Oxygen hose marked GOST 9356-75

• class I - a series of oxygen hoses used to supply various gases or their mixtures (propane, butane, natural gas) under pressure up to 0.63 MPa;
• class II - hoses that are designed to supply liquid (A-72 gasoline, kerosene, white spirit or mixtures thereof) under pressure up to 0.63 MPa;
• class III - a series of pressure oxygen hoses used exclusively for supplying oxygen at high pressure (working pressure can be 2 and 4 MPa).
• The class of the product is indicated in the labeling.

Gas hose classes

Depending on the purpose and area of ​​application, oxygen hoses according to GOST 9356-75 are divided into the following classes:

• I – oxygen hoses designed for supplying acetylene, city gas, propane and butane under pressure. The working pressure for which the first class oxygen hose is designed is 6.3 kgf/cm2 (0.63 MPa).

• II – oxygen hoses used for supplying liquid fuel: A-72 gasoline, white spirit, kerosene or mixtures of these liquids at an operating pressure of 6.3 kgf/cm2 (0.63 MPa).

• III – oxygen hoses, operated to supply oxygen at a pressure of 20 kgf/cm2 (2.0 MPa) and 40 kgf/cm2 (4.0 MPa).

Oxygen hose GOST 9356-75

Wholesale prices for sleeves 12/01/2020

Prices for products must be clarified with the company's managers by phone.

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In April 2022, we completely switched to the production of inflatable plugs made of synthetic fabric with PVC coating, pneumatic plugs of universal PZU - D and pneumatic plugs of flow-through PZP - D, designed for quickly and reliably shutting off pipelines during repair work and installation, including including during the construction of hospital complexes.

The plugs can be used at ambient temperatures from minus 30 to plus 60 ⁰С and have improved strength characteristics - the operating pressure in the plug is significantly increased.

Symbols on gas hoses

The symbol for an oxygen hose according to GOST 9356-75 contains:

• product name,
• class indication,
• internal diameter value in millimeters,
• value of the design pressure in MPa,
• if necessary, climatic version,
• as well as instructions from GOST 356-75.

An example of a symbol for a class I oxygen hose with an internal diameter of 16 mm, designed for a working pressure of 0.63 MPa, operable in areas with a tropical climate: Hose I-16-0.63-T GOST 9356-75.

Oxygen hoses intended for use in areas with cold climates have the symbol “HL” in their designation . The design of oxygen hoses for temperate climates, according to GOST 9356-75, does not require an additional marking symbol.

Sleeves for gas welding GOST 9356-75 with a diameter of 16 mm in the online store mtrservis.ru

The gas welding hose can be used in areas where it is necessary to supply liquid or gaseous fuel under pressure.

The flexible gas hose has two distinctive color stripes on the outside, indicating that it belongs to one of three classes. With a red stripe - I class, with a yellow stripe - II class, with a blue stripe - III class.

GOST 9356-75 Download GOST 9356-75 in pdf

LLC PP "MTR-Service" offers to buy hoses for gas welding with delivery to Moscow at a competitive price.

• Price
• Characteristics
• Detailed description

Hose I class

Internal diameter, mm. Outer diameter, mm. Working pressure, atm. Length, lm Weight, kg. / p.m.

Hose II class

Internal diameter, mm. Outer diameter, mm. Working pressure, atm. Length, lm Weight, kg. / p.m.

Hose III class

Internal diameter, mm. Outer diameter, mm. Working pressure, atm. Length, lm Weight, kg. / p.m.

Example of a symbol: Sleeve class. III oxygen f 9 mm (20 atm) GOST 9356-75 class 3 - hose class 9 - internal diameter (mm) 20 atm. — working pressure (atm)

GOST 9356-75 - State standard

All three types of hoses comply with GOST 9356-75 and can be used in areas where it is necessary to supply liquid or gaseous fuel under pressure.

The flexible gas hose consists of a thread frame and a rubber layer; on the outside it has two distinctive color stripes, indicating that it belongs to one of three classes.

At MTP-service you can buy an oxygen, gas hose or a hose for liquid fuel.

The hoses are used in temperature conditions from -35C to +70C for temperate climates and from -55C to +70C in cold climates.

Gas hose acetylene, propane (Class I)

A gas hose with a red stripe is very often used in residential buildings to connect gas equipment to cylinders, pumps, gas pipelines and is more often used as a hose for:

• gas stove, cylinder,
• geyser, burner, boiler,
• propane tank, cutter,
• welding machine,
• gas welding, cutting,
• semi-automatic,
• metal cutting,
• oxygen cylinder,
• gas stove, cylinder.

The working medium used for the gas hose is all types of gas fuel: acetylene, city gas, propane, butane. Hence it is often called propane, acetylene or butane hose.

Hose for liquid fuel (Class II)

The yellow stripe hose is used for welding and metal cutting equipment that uses liquid fuels:

• diesel fuel,
• petrol,
• kerosene,
• White Spirit
• and other mixtures.

Oxygen hose (III class)

Blue stripe oxygen hose is very commonly used and well in demand as a welding hose or metal cutting hose.

The oxygen hose is used as a hose for:

When using an oxygen hose, you can use a working medium in the form of oxygen, gas and liquid fuel, so it is universal.

Frequently asked questions about gas hoses

Our manufacturing enterprise MTP-service has been in the rubber products market for more than 7 years. We have extensive experience in communicating with clients and are always ready to help make a choice.

What is the diameter of the gas hose?

Determined by the internal diameter and measured in millimeters. MTP-service supplies gas (oxygen) hose 6.3mm, 9mm, 12.5mm.

What is the length of the gas hoses? What is the maximum length of the gas hose?

The hose is packed in coils of 50 meters. In our company you can buy a gas hose from 1 to 50 meters.

Where to buy a gas hose?

You can order a sleeve on our website or by calling +7. The MTP-service warehouse is located at Chelyabinsk, st. 2nd basic 37.

How much does a gas (oxygen) hose cost?

Oxygen hose, the price depends on the required diameter and manufacturer, so it ranges from 30.9. up to 80.6 rub. per meter

Gas hose, price also varies from 25.1. up to 47.9 rub. per meter

The price of a hose for liquid fuel is from 47.3 to 73.5 rubles. per meter

Gas hose, which is better?

It all depends on what purpose you are purchasing it for. The oxygen hose with the blue stripe is universal.

What pressure is applied to the oxygen hose?

The pressure for oxygen hoses is increased and is 2MPa. For class I and II hoses, the pressure is much lower - 0.63 MPa.

Gas hose colors

Depending on the purpose and area of ​​application, oxygen hoses have different colors.

• The red color of the sleeve indicates that the product belongs to class I, and is intended for supplying acetylene, city gas, propane or butane
• Yellow – class II hoses, for supplying liquid fuels
• Blue - class III products for oxygen supply.
• Black color of the outer surface of the oxygen hose is allowed, and the product class designation is applied in the form of two colored stripes.

Design features

Welding hose structure

The oxygen hose has a multi-layer design. The inner and outer layers are made of elastic rubber. The intermediate one performs a reinforcing function and can be made from either cotton fibers or synthetic fibers. The basis of the rubber layer is natural or synthetic rubber with modifiers that change its physical and chemical characteristics depending on the operating environment. The outer rubber layer of the welding sleeve can be modified to provide resistance to abrasion, ultraviolet radiation and heat.

To visually distinguish products for different purposes, the outer rubber layer can be painted in different colors:

• red - class I oxygen hoses;
• yellow - for rubber products of class II;
• blue - for class III hoses.

According to GOST 9356-75, it is allowed not to paint the outer rubber layer. In such cases, the hoses are black, but colored stripes are applied along the entire length of the product, which correspond to the class.

Gas welding hoses are flexible products. Provided that the minimum bending radius is observed, the deformation of the internal section should not exceed 10% of the nominal values.

Gas hose quality assessment

Oxygen hoses are flexible products, and with a minimum bending radius, the change in the outer diameter of the product does not exceed 10%.

Criteria for visual quality control of an oxygen hose

• Oxygen hoses manufactured in accordance with the requirements of GOST 9356-75 should not have folds, porosities, bubbles or cracks on the surface of the internal rubber layer.
• The outer surface of the oxygen hose should not contain bubbles, peeling or exposed areas of the load-bearing frame.
• To clarify the criteria for visual rejection of products, a control sample approved in the prescribed manner is used.

Reception of gas hoses

Oxygen hoses are accepted in batches. A batch is understood as products of the same class and size in quantities with a total length of no more than 2000 meters. Each batch of oxygen hoses is accompanied by a quality document containing the following information:

• trademark or trademark and name of the manufacturer
• name of oxygen hoses,
• Class,
• inner diameter
• working pressure and overall length
• batch number
• month and year of manufacture
• designation GOST 9356-75
• stamp of the technical control section confirming the compliance of the quality of oxygen hoses with the requirements of GOST 9356-75.

To check the compliance of the quality of oxygen hoses with the requirements of GOST 9356-75, the products are subjected to acceptance tests in appearance (design, color, size), a leak test under hydraulic pressure, a tensile strength test under hydraulic pressure, a gasoline resistance test of the inner layer (for hoses) oxygen class II), testing the strength of bonds between the elements of the product, monitoring the condition of the internal surface.

Hose Lengths for Gas Cutting and Welding - Metals, Equipment, Instructions

Oxygen hose for gas welding

— is an indispensable element in working with chemicals in production. They fully support the entire work process. Their function is that the device provides gas welding devices, as well as devices for cutting metals with various gases.

As a rule, only those gases that are necessary for the operation of these devices are transported. These types of gases include: oxygen, nitrogen, argon, carbon dioxide, as well as propane butane and others. In addition, gas welding hoses can supply compressed air.

It is worth noting the fact that air temperature quite actively affects various gases, taking into account climatic conditions, the work process must be carried out according to the following parameters:

• In areas with tropical and temperate climates, for complete operation the air temperature must reach at least - 35°C, with a maximum temperature of + 70°C.
• In areas characterized by a cold climate, the minimum temperature should be - 55°C and the maximum + 70°C.

According to the basic standards GOST 9356-75, the length of all classes of hoses for gas welding should be from 50 to 100 meters. The difference in length may vary, depending on agreements between the manufacturer and the consumer.

Oxygen hoses, the price of which is low, are manufactured in long lengths in coils of 50-100 linear meters in one piece. Upon request, specialists can produce a device of appropriate length. During various works, gas welding hoses according to GOST 9356-75 are divided into three main classes:

Gas welding hose GOST 9356-75 class I

Rubber hoses for gas welding and cutting of metals GOST 9356-75 class I are used for supplying under pressure: acetylene, city gas, propane and butane. Working pressure - 0.63 MPa. On the outer layer a red stripe is applied along the entire length of the sleeve.

Gas welding hose GOST 9356-75 class II

Rubber hoses for gas welding and metal cutting GOST 9356-75 class I are used for supplying liquid flammable substances under pressure: gasoline, kerosene, white spirit and their mixtures. Working pressure - 0.63 MPa. On the outer layer a yellow stripe is applied along the entire length of the sleeve.

Gas welding hose GOST 9356-75 class III

Rubber hoses for gas welding and metal cutting GOST 9356-75 class I are used for supplying under pressure: oxygen to devices for gas welding and metal cutting. The most commonly used in industry is a 9 mm oxygen hose. Working pressure - 2.0 MPa. On the outer layer a blue stripe is applied along the entire length of the sleeve.

The 9 mm oxygen hose is manufactured on the basis of the developed regulations GOST 9356-75, in accordance with all norms and quality standards, the oxygen hose consists of:

• rubber layer that forms the inner base,
• frame made of cotton fiber.
• outer layer of impregnated chemical fibers.

Since hoses for gas welding are divided into classes, they have a corresponding color scheme, which allows you to quickly distinguish one class from another:

• Class I propane hoses have a red stripe;
• Class II kerosene sleeves have a yellow stripe;
• Class III oxygen hose has a blue stripe.

According to GOST 9356-75, quite often an independent black color is added to the color equipment, which can be found in all types that include oxygen hoses.

According to climatic aspects, oxygen hoses for individual regions have appropriate frost resistance up to the temperature that is the permissible limit of each type. In addition, the 9 mm oxygen hose has a fairly high tightness under hydraulic pressure.

In the event of a rupture of the main elements, the hoses contain a three-fold safety margin, which will not lead to the spread of the transport gas in the room. Devices of all classes have corresponding flexibility.

The entire surface of the outer layer is completely free of cracks, folds, and various bubbles, which could subsequently lead to the destruction of the entire structure. If all standards are correctly followed, the service life of a hose for gas welding and metal cutting GOST 9356-75 is 1.5 years.

After the service life expires, experts advise changing it to another one. An oxygen hose, the price of which per meter does not exceed 60 rubles, is not an item worth saving on and using after the expiration date.

On the other hand, you can seek advice from specialists who will give an accurate assessment of the operation of this mechanism. In turn, the manufacturer guarantees high quality material. If all operating norms and standards are met, no additional problems should arise. If certain problems occur, the manufacturer can quickly remove them or replace the product.

What is a welding sleeve and why is it needed for gas welding work? — Welding

To supply gas from the cylinder to the torch or cutter, flexible welding hoses with a thread frame are used, the manufacture of which is regulated by the requirements of GOST 9356-76. Such sleeves withstand temperature changes well from -35°C to +70°C. These sleeves consist of an inner rubber layer, a cotton braid and an outer rubber layer.

Welding sleeves can be of the following types:

• type I - for acetylene and city gas, designed for a working pressure of no more than 0.63 MPa;
• type II - for liquid fuel (gasoline, kerosene), designed for a working pressure of no more than 0.63 MPa;
• type III - for oxygen, designed for a working pressure of no more than 2 MPa.

The inner diameter of the sleeves can be 9, 12 and 16 mm, and lightweight ones - 6.3 mm. To ensure that welding hoses can be distinguished, a marking system is used.

To do this, an embossed inscription is placed along the entire length of the sleeve indicating the type of sleeve, its internal diameter and GOST regulating quality indicators. In addition, the hose marking may include a letter index indicating the climatic region for which it is intended.

Thus, the “HL” index means that the hose is designed to work in areas with cold climates, and the “T” index indicates a tropical climate. The digital index is usually placed before the word GOST.

The outer layer of the hoses has a color depending on the type of gas for which it is intended: blue - for oxygen; red - for acetylene; yellow - for liquid fuel. The outer color of the hose does not necessarily have to be a color indicating the type of gas.

To do this, just touch up the markings. The tint is applied in the form of colored rings or stripes. Oxygen hoses with a black outer layer, intended for use in all climatic regions, are usually not color coded.

Marking

Each oxygen hose must be marked. Each product along its entire length, or at intervals, must be applied by embossing, indelible paint or another method that guarantees the clarity and safety of the designation and marking. The oxygen hose marking contains:

• name or trademark of the manufacturer,
• product class,
• designation of the internal diameter, date of manufacture (month and last two digits of the year),
• the value of the design pressure,
• designation GOST 9356-75.

GOST 9356-75 allows marking on the label for oxygen hoses with a diameter of 6.3 mm. For colored oxygen hoses, the paint color for marking must be white; on oxygen hoses with a black surface, the color of the marking must correspond to the class of the product.

Storage conditions

• Oxygen hoses must be stored indoors at temperatures from -20C to +25C
• Products should be stored in coils with a height of no more than one and a half meters, or in a straightened form and placed at a distance of at least one meter from heat-emitting devices.
• If oxygen hoses are stored at subzero temperatures, the products must be kept at a temperature before installation
• at room temperature for at least 24 hours.
• During storage, oxygen hoses must be shielded from direct sunlight and heat rays, and be reliably protected from contact with oils, gasoline, kerosene or their vapors, as well as from acids, alkalis and other substances that can destroy rubber or thread frame.
• It is prohibited to store oxygen hoses near operating electronic and other equipment capable of emitting ozone, as well as near artificial light sources that emit ultraviolet rays.