There are two methods to check how much gas there is in the cylinder: weigh it or measure with a special instrument, the pressure gauge. In the first case, check the labeling on the bottom before filling. It contains manufacturer plant data, date of the latest re-qualification, manufacture date, rated volume, dimensions, operating pressure and empty vessel weight. Then we measure the cylinder weight with the remaining residue of the substance and calculate the difference.

The second way is to check the level of pressurized gas in the cylinder with the help of the pressure gauge.

Defective cylinders are not accepted for refill. What does it mean? If there is a number of defects on the cylinder body (corrosion, defective valves), or if the vessel's label is illegible, or there is no label record at all. Also, the cylinder will be rejected from refill, if:

• it has not been re-qualified in the specified time;
• outdated porous mass check deadline;
• valves are faulty;
• no proper painting or inscriptions;
• no gas overpressure;
• applied marks are missing.

Yes, BK Group offers gas cylinder requalification. Gas storage and transportation cylinders must be verified and requalified every five years. Cylinder operability verification includes:

Visual inspection to check for damage and deformations, check for labeling and color compliance (according to GOST)

• Checking records in the cylinder label
• Pressure hydraulic testing of the cylinder to check for leaks
• Final weighing of the container to check the wall metal thickness

Each cylinder has a special mark with numbers. The mark has data of the manufacturer, time of the last attestation, production date, rated volume, dimensions, operating pressure, weight of the empty cylinder. If the cylinder has already been re-qualified, then there should be a mark from the organization that performed this operation.

Except the standard data, the cylinder surface may also include individual unique data. For example, the mass is indicated in kilograms, the capacity is in liters, and the operating and the verification pressure in the standard atmospheres.

Cylinder bundle is a group of several gas cylinders in one frame with one header. They are designed for transportation, storage and distribution of large quantities of gases. Bundles are recommended for production sites with high gas consumption rate.

• Machinery production;
• Vessel building;
• Installation of metal structures;
• Welding operationsы

Gas cylinders, regardless of the type of transport, should first of all be safe: please observe all safety measures. These are the rules applicable to the transportation of most gases:

• Avoid impact
• Avoid overheating and keeping near fire
• Do not transport gas cylinders together with food items, flammable and explosive substances, and in the passenger compartment of a light motor vehicle
• Avoid leaks

Gas cylinders should be stored observing all the precautions, both at the special warehouses and outside. If the cylinders are not placed in a room, they should be protected from precipitations and sunlight. Also, avoid mechanical impact during storage. Protect gas cylinders from overheating and check for leaks. Also, do not store oxygen cylinders together with flammable gas cylinders.

The gas purity means a parameter which specifies the number of foreign impurities in a substance, in this case, in gas. The higher this parameter, the higher is the quality of the substance. The degree of purity is measured in per cent. The number corresponds to the minimum guaranteed purity, or the complete number of foreign impurities found during the gas analysis..

BK Group does prepare cylinders for filling with pure gas. This process includes several steps.:

1. Cylinder inspection. Specialists assess the technical condition of the cylinder, presence or absence of defects, accreditation validity.
2. Shutoff valve checkup
3. Temperature-vacuum desorption. This is a process taking place in a special unit, which is used to prepare the gas cylinders for subsequent filling.