When discussing whether a mobile oil purifier is worth buying, it is easy to fall into a trap: comparing its price with that of a cheaper fixed machine. What actually separates the two is the cost of time inside the maintenance window.
Breaking down the cost of the maintenance window
Treating a job by subcontracting it out or by borrowing a fixed machine involves four cost items in practice: transporting the machine to the site, providing temporary power and connecting it, setting up and removing the pipework, and taking the machine back when the work is finished. Three of the four fall inside the maintenance window, and the window is the scarcest resource of all: the plant has already been shut down, the crew has already been assembled and the follow-on work has already been scheduled. Every extra day taken pushes all of that back.
A mobile machine removes the first and the fourth item outright: the machine is already on site, so there is nothing to transport in and out. The second item depends on whether the site has a three-phase 380V industrial power supply, which can be confirmed before departure. The third item depends on the type of connection: standard models use quick-connect couplings, and with the pipework prepared in advance the connection time can be kept very short. What is actually left for the site to absorb is moving the machine to the working position and connecting the pipework.
The two kinds of mobile equipment have different roles
- JL series portable filtering and filling machine: it can be pushed by one person, the filtration accuracy is 10~25 μm, and its role is pre-filtration on site and quick top-up. It suits occasional jobs with a small oil volume and scattered work positions.
- TYG series mobile vacuum oil purifier: it carries a complete vacuum system and can carry out the degassing and the dehydration of insulating oil. TYG-50, TYG-100 and TYG-200 correspond to different throughputs, and their role is to replace the fixed machine that would otherwise have to come on site.
When mobile equipment does not pay
There are three situations in which the mobile approach loses its advantage: the oil volume is very large and concentrated at a single base, where the unit processing cost of a fixed station is lower; the job runs for several weeks or more, where mobile equipment needs a stable parking area, a power supply and protection; the oil is corrosive or the medium is unusual and needs the additional functions of a large fixed installation. Apart from these three, in scenarios with scattered work positions, a tight window and a small single-batch volume, the overall cost of a mobile machine usually comes out better.
The part of the account that is easily missed
There is one benefit that is rarely put into the model: a mobile machine puts the treatment capacity on site and removes a step from the oil transfer chain. Moving oil back and forth is in itself a contamination opportunity, because the tanks, the hoses and the containers can all introduce moisture and particles. If the oil has to be taken back to the central station for testing after treatment and then sent out again, that round trip reduces the purification that has just been done.
The value of a mobile machine is not that a single job costs less, but that it turns window time, which cannot be controlled, into on-site working time, which can.