ALKA S.r.l.
Registered office: Via Teodoro Frizzoni 19 - 24121 Bergamo - Office: Via Molino Baertsch, 4 - 24124 Bergamo
Tel. +39 035 664881, Cell. +39 335 355569 - E-mail: info@alka-srl.com , PEC postmaster@pec.alka-srl.com
Bergamo Business Register, EORI, Tax Code and VAT No. IT02515810162 - Recipient code T04ZHR3
BG050196 mechanographic number, REA: BG 300962, Share capital €10,400.00 fully paid up.
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1- Cleaning new piping for Liquid Oxygen (105m)
Example of cleaning a new line for liquid oxygen distribution. In this case the projectiles were pushed by the pressure supplied by a nitrogen cylinder. As you can see welding residues and other dirt were removed. Then projectiles soaked with degreasing liquid were shot and then dry projectiles to remove product residue. Nitrogen further helped to dry the inside of the piping.
2- Refurbishment of an old liquid oxygen pipeline
In the video you can see the procedure carried out to clean and degrease the existing liquid oxygen line in order to re-qualify it for use.
The piping showed clear signs of rust corrosion, whose removal required shooting several dry projectiles, of different diameters, to gradually remove the coarser debris.
After removing the rust deposits, a degreasing product was applied over the entire inner wall, soaking other projectiles with this product and sending them through a few times to remove the remaining excess degreasing liquid inside the pipe.
To finish, a dry projectile was shot for final cleaning and for removing any trace of residue, both rust and degreasing liquid, thus returning a clean, dry pipe ready for use.
This type of operation allowed the customer to save several thousand euros and a significant number of workdays that would have been needed to replace the underground pipe, while in our case the cost was dozens of times lower and the time required for cleaning was under two hours.
3- Cleaning the copper heat exchanger coil for refrigerant gas
This video shows the cleaning operation of a copper coil for refrigerant gas, in order to remove various impurities such as: oils, welding slag, dust and soot residues from the production of the copper tube itself or from later processing; a key operation to prevent mechanical failures, caused by the passage of these impurities, to components such as compressors and valves.
Shooting a projectile inside each single section of about 38m in length takes just 5 seconds. Repeating the operation a total of 3 times proved sufficient to obtain the desired result.
4- Laser welding, cleaning and degreasing of flexible tubes for Nitrogen
This video shows the degreasing operation of flexible tubes, inside which nitrogen flows, before assembly on a robot for laser welding.
The tubes, purchased from an external supplier in charge of their assembly, showed inside traces of oil from the fitting process.
The cleaning operation may require several passes, until a satisfactory result is obtained, but only a few minutes are still enough.
In this way it is easy to check the quality of incoming tubes and ensure that a simple production residue on such a simple component does not impair the performance and reliability of a much more sophisticated system.
5- Oxygen and Nitrogen piping cleaning for laser cutting
In this cleaning operation of a nitrogen and oxygen conveying system for laser cutting, it was necessary to remove any contamination and machining residue that could damage and clog the machines. Due to the system layout, with progressive diameter reductions, it was necessary to use the Food&Flex projectile, more adaptable in these situations.
The line in fact started from an internal diameter of 30mm, narrowing to 19, and ending at 15mm.
In the video you can also see a temporary solution adopted to introduce cleaning liquid inside the vertical drops, connecting a U fitting, into which to pour the liquid and then shoot the projectile, choosing to connect with direct air, via quick connection, given the line’s considerable length (115m).
6- Cleaning and degreasing 154mm pipes
This video shows the cleaning of a section of refrigerant gas piping used to feed the turbine of the air-conditioning system, carried out by our partner System Fluid s.r.l.
The welded and flanged pipe, with an internal diameter of 154mm, is cleaned after its construction but before installation; this makes the cleaning operation easier.
In this case there was a need, in addition to removing machining residues, also to degrease the pipe itself, which is why the projectile was soaked with a degreasing product and then shot several times, and finally another dry projectile was shot to absorb any residue. The shooting operation was carried out, given the large diameter, without the aid of the launcher, but by blowing nitrogen through a flange directly connected... at a pressure of about 8-10 bar.