Gas-holder for the dacha: mini options for the arrangement of summer cottages
Not all summer cottages have centralized gas supply. Heating a house with electricity is expensive. Autonomous gasification is a good alternative. If you are not satisfied with the installation of a group of cylinders, then the implementation of this idea will require a gas tank to give - a special tank, which is filled with a mixture of liquefied hydrocarbon gases.
This kind of fuel is cheaper than electricity.
Features of installation of a gas-holder
A gas-holder is not only a tank for storing the fuel mixture, but also a place where the liquid phase passes into a gaseous state for further supply to the heating line under constant pressure. An important point in the device of an autonomous gas system is a competent choice of a gas-holder, which requires the calculation of its technical parameters.
To determine the capacity of the tank, the heated area is multiplied by the average amount of fuel consumed by boilers with an efficiency of 60 to 70%.It is approximately 17 liters for winter, when there are few days with very low temperatures.
If the region of winter is consistently harsh or there are warm floors in the country, the pool, the water in which you need to be heated, increases the calculated volume. In the summer or in the off-season, 3.3 liters is enough to heat 1 m².
For operation of a mini-gas-holder or a tank, the volume of which does not exceed 10 tons, no permission from Rostechnadzor is necessary provided that the SNIP requirements for installation are fulfilled, and the power of heating devices is not more than 100 kW. If this power does not suit and it needs to be exceeded, then it will be necessary to obtain permits.
It is also not necessary to ask for the consent of the owners of the neighboring sites if the communications will not take place in the immediate vicinity of the area. In any case, in order to avoid all misunderstandings, it is good to have a certificate of quality on hand. It must be taken in the company that sold the equipment and has a license to install it.
Basic requirements for the location of the gas tank
Not any place on the site is suitable for installing a propane-butane tank. In order for all conditions to be met, it must have appropriate dimensions. The main thing is that the tank needs free access, otherwise it becomes impossible to refuel and maintain it.
All communications are allowed to lay only underground. The tank itself should not be under a driveway or other road. The optimal distance from the road to the reservoir is 5 m. At least 8 m should be retreated from the economic purpose buildings on the site. 10 m to the basement of the house and 20 m from the house of the neighbor. The factory data plate should be in sight.
It will be allowed for the installed tank to rise above the ground at a maximum of 0.6 m. It must be grounded, and if there is static voltage at the site, measures are needed to protect against electrochemical corrosion.
The main components of the gasification project
In terms of autonomous gasification consists of a reservoir, manufactured and passed all stages of testing in the factory, pressure regulators, protection, gas pipeline. The protection is made of magnesium electrodes located about 0.35 m from the tank. The purpose of the condensate collector is to collect liquid butane, which then evaporates on its own.
The gas pipeline is assembled from polyethylene pressure pipes. They are laid before entering the house, mounted from metal pipes and equipped with a shut-off valve, and a bellows-type compensator. The internal pipeline is completed with thermo-closing valves.
Stages of installation of a gas-holder
To immerse the gas tank, a pit is prepared, at the bottom of which a cushion of sand and gravel is arranged. Next, pour a monolithic base with a height of at least 160 mm. Without this, the unit can squeeze groundwater from the pit. Sometimes the tank is immediately fixed on the finished reinforced concrete slab, and then all together put into the pit.
After mounting the tank is covered with a special lubricant that protects the metal from corrosion. The next stage is the anode-cathodic protection device.After that, the gas pipeline is laid, it is poured and the pit is filled with soil.
Types of gas-holders for giving
Gas-holders are both stationary and mobile. Capacities of stationary type are divided into aboveground and underground. For a house where they live permanently, a stationary tank is more suitable, and in the case of a summer house intended for seasonal use, it is more rational to use the mobile option.
When using ground-based gas tanks
Ground gas tanks are characterized by ease of installation, since no earth works are required. The reason for the unpopularity of this option is the moment that the fuel mixture evaporates very slowly at low temperature. Therefore, the tank must not only be warmed, but also equipped with evaporators.
For one country house to do it is irrational,but if a large-capacity tank is used to provide fuel to an entire holiday village, this option is better. This is due to the fact that the decision to bury a gasholder with a volume of up to 6 tons m ² to the ground will be much more expensive.
How to use underground gas tanks
Underground tanks are placed in the ground below the freezing point. There are advantages to this solution:
- site design does not suffer;
- there is no need for additional equipment that supports stable evaporation of the gas mixture.
Underground tanks are used for gas supply of the village consisting of several houses. With underground installation of a gas tank, the minimum distance from the ground level to the top of the tank is on average 0.6 m. This parameter is greatly influenced by the climatic conditions of the area.
A high-quality gas tank for underground installation must be equipped with a high neck, which will allow to place it at the required depth.This will facilitate the task of periodically checking the walls of the tank and welds for strength.
The tank should have a wall thickness of 6 mm minimum and the thickness of the anticorrosive epoxy polymer shell is not less than 1 mm. The tank sales company must present a certificate confirming that the product meets all requirements, as well as the permission of Rostechnadzor to use it.
Features of mobile gas-holders
Mobile tank of about 500 m3placed on a caravan. Connecting such a gasholder to the gas pipeline is not complicated, and it also performs this operation very quickly. In fact, this is the same gas cylinder, only of a larger volume and having a gas heating system. This amount of liquefied fuel can heat a small cottage throughout the winter.
These mini-tanks are compact - about 2 meters long and 0.6 meters in diameter.They have a rather long service life of up to 25 years. If gas is needed exclusively for cooking, then such a quantity is enough for 2 years. To use the house year-round, you will need a 2.5-ton capacity tank, but when you need to heat household buildings, the storage size will have to be increased.
The advantages of the gas tank minimum size
If we compare the miniature gas tank with a volume of 500 or 1000 liters with its large counterpart, we can note the following advantages:
- It is much cheaper, so it has a shorter payback period.
- You can install it yourself.
- Capacity does not need to be hidden in the ground, and this significantly reduces installation time.
- No strict requirements for the installation site. Clause 8.2.3. SP 62. 13330. 2022 states that it is possible to locate a mini-tank directly at the wall of the house.
- Gasification with the help of such a gas-holder is carried out very quickly - it will take only about 2 hours.
There are many advantages in the case of comparison with a conventional gas cylinder. The main thing is that the gas tank is not explosive. The valves included in its package do not allow the pressure to rise above the established norm.The presence of measuring instruments ensures that during refueling no more liquefied mixture will get into the tank than it should be. Since the mini-tank by volume replaces a dozen standard 50-liter cylinders, it is charged infrequently.
To replenish the gas mixture it is not necessary to visit a gas station. If the gas-holder is installed not on the trailer, but simply on the platform near the house, then it is possible to refuel it in place.
Unlike a cylinder, it can supply not only a stove with gas, but also other more powerful equipment. Due to the fact that the tank has a level gauge, you can always find out how much of the mixture in it remains. This allows you to pre-schedule refueling.
Gas-holders depending on execution
Depending on the design features, underground gas-holders for arranging a summer house are divided into horizontal and vertical, occupying 3 times less space than horizontal ones.
Gas-holders for giving vertical
This option is well suited for suburban housing, with a small local area. Ideally, when it has a high neck, then it is buried to a depth of approximately 4 m.This will help avoid gas condensation during cold weather.
While as the fuel consumption from a horizontal tank decreases, the area of gas evaporation decreases, in a vertical gasholder when the level of the mixture is lowered, the mirror area remains constant.
Despite lower productivity, this is a significant advantage, but due to the considerable height of the tank and the depth of freezing of the ground, a lot of effort will be required to prepare the place for it.
Models of this type are suitable for country houses, the area of which does not exceed 150 m². Good vertical gas tanks are made in Italy, in particular, manufactured by Antonio Merloni. They are equipped with a thermal protective layer that allows you to keep a stable temperature during extreme cold.
The vertical tanks of the company from Bulgaria CITI GAS are also popular. The model range consists of tanks of 2700, 4800 and 6400 gas-liters. The gas-holders of these two companies are distinguished not only by the volume, but also by the color of the tanks and the logos on them.
The cost of vertical tanks is higher than that of horizontal samples. They effectively serve the gas mixture in the temperature range -40 - + 40⁰. The term of their operation is 30 years.
Characteristics of horizontal tanks
Horizontal gas tanks are more productive than vertical ones. There is one caveat - this indicator is unstable. As soon as the level of the gas mixture drops to 1/3 of the volume, it begins to fall, so the system cannot function stably without a special reducer.
Horizontal tanks are effective for heating a house with an area of 200 m² or several buildings at once. To install the horizontal tank is prepared pit shallow depth. Its volume should be taken by 20% more from the estimated need for fuel. This is necessary to ensure that the gas is sufficient to maintain performance after reducing its volume to a critical value.
The metal case of the gas-holder can withstand a pressure not exceeding 1.8 MPa. Antonio Merloni is also leading among manufacturers of horizontal units. The market is present and units of the Czech company Deltagaz, Polish Chemet. The normal functioning of these tanks is possible even in non-standard situations and in the most severe winters.
Features of filling gas tanks with a mixture of gases
The frequency of filling tanks with propane-butane depends on their volume and on how intensively it is used. On average, it is 1 - 3 times a year. The main thing is not to miss the moment when the balance will be about 30%. Fill the tank to the top, and not more than 85%.
The supplier of the gas mixture must have a license and special transport. The easiest way is to fill in mobile modifications of mini gas holders for servicing summer cottages, since they can be transported on an automobile trailer. Before filling the gas-holder, the indicators of the devices must be checked.
Conclusions and useful video on the topic
About the installation of the gas tank:
About mobile gasholders:
The purchase and installation of any gas tank must be preceded by calculations of its volume, payback time of the unit. The obtained results should be compared with alternative types of heating and only then make a decision.