oil and gas production - a very specific kind of industrial and economic activity.One of the distinguishing features of this species is a wide variety of used equipment, responsible for the implementation of some kind of functions.
In general, all used in the oil and gas field equipment can be divided into several interrelated categories.Here, as an example, a few of them:
1) It is difficult and technical equipment - equipment and installations for the production, processing, storage and transport of oil and gas;
2) Pipe and fittings - products used in piping systems equipment (cranes, latches, locks, etc.);
3) Reservoir equipment - equipment for assembly of various types of tanks (vertical / horizontal) and volume;
4) Electro-technical (light poles, pillars, etc.), cabling and wiring products.
Among other things, the structure of the above categories, and decided to allocate the brightest (important) subcategories.For example, tank equipment base subcategories are breathing equipment (respiratory or fittings).By means of the data it is accepted to all kinds of respiratory valves, such as the CDM, SMDK, KDM, NDKM and CNG.Consider one of these types - hydraulic safety valve CNG.
so.Safety hydraulic valves CNG is used as a device, the main function of which is the responsibility of preventing the destruction of the reservoir design with oil in the event of repeated excessive pressure rise.The main structural elements of the valve body are presented with mounting flange, a cup, a pipe clip, screen, flame arresters, cover, drain tube-filling, drain holes, flange transition.
principle of operation of the valve is as follows.If you have high blood pressure in the reservoir is forced into the pipe is available in a cup of liquid (as decided to use a fluid operated transformer oil according to GOST 982-80).Further, when a repeated excessive pressure - this fluid is ejected onto the screen, and is reflected by it accumulates in the annular plane.The ejected liquid thus passes through the discharge nozzles and reused to fill.After carrying out this process ullage space of the reservoir structure communicates with the atmospheric air via free gazoprohody, thereby ensuring release of overpressure.
Specific requirements for the maintenance of such valves.In the operation of the valves CNG must undergo systematic inspections:
- at negative ambient temperature - at least once every nine days;
- at zero temperature background of the environment - not less than twice a month.
Thus, during preventive examinations deemed necessary to carry out the washing with benzene or thinner tape firing fuse and blown with compressed air to remove possible deposits of tar and dust.
In addition, during the inspection of the hydraulic valves is necessary to check the level of liquid water seal, keeping it in the optimal ratio in accordance with the instruction manual.Water and ice formed in the cavity of the valve due to condensation processes are subject to immediate removal.
important feature - operation of the valve in the autumn-winter period is carried out without firing a fuse.
For one of the main requirements that apply at the installation, repair and overhaul of equipment of this type is the use of intrinsically safe intrumentov, as well as the use of repair kits (for repair) Only those producers who made himself the valve.
common average time between failures of safety hydraulic valves CNG is thirty-six thousand cycles (a cycle refers to one opening and closing the valve), and the average life span is 15 years.
