Automatic Flamcomat Pressure Maintenance Installation (Pump Control)

Application area
AUPD Flamcomat is used to maintain constant pressure, compensation of temperature extensions, deaeration and coolant loss compensation in closed systems Heating or cooling.

* If the system temperature at the installation site exceeds 70 ° C, it is necessary to use the FlexCon VSV intermediate capacity, which provides cooling of the working fluid before installation (see HL. "VSV Intermediate Capacity").

Purpose of installation Flamcomat

Pressure maintenance
AUPD Flamcomat maintains the required pressure in
The system in the narrow range (± 0.1 bar) in all operating modes, and also compensates for thermal expansion
coolant in heating or cooling systems.
In the standard version, Installing Aoupes Flamcomat
Consists of the following parts:
. membrane expansion tank;
. Control block;
. Connecting to Baku.
Water and air medium in the tank are separated by a replaceable membrane of high-quality butyl rubber, which is characterized by very low gas permeability.

Operating principle
When heated, the coolant in the system is expanding, which leads to an increase in pressure. Pressure sensor fixes this increase and sends a calibrated signal to
Control block. The control unit, which is constantly fixed by the fluid level values \u200b\u200bin the tank, opens the solenoid valve on the position of the position through which the excess heat carrier is flowing from the system to the membrane expansion tank (the pressure in which is atmospheric).
Upon reaching a given pressure value in the system, the solenoid valve closes and overlaps the fluid flow from the system into the expansion tank.

When cooled coolant in the system, its volume decreases and pressure drops. If the pressure drops below installed levelthen the control unit includes

pump. The pump is operating until the pressure in the system is raised to the set level.
Permanent control of the water level in the tank protects the pump from the "dry" stroke, and also protects the tank from overflow.
If the pressure in the system goes beyond the maximum or minimum, then, accordingly, one of the pumps or one of the solenoid valves is triggered.
If there are not enough performance of 1 pump in the pressure line, it will be involved in the 2nd pump (control unit D10, D20, D60 (D30), D80, D100, D130). AUPD Flamcomat with two pumps has a security system: if one of the pumps or solenoids fails, the second is automatically turned on.
To level the time of the pumps and solenoids during installation and increase the installation time of the installation as a whole, in two-axial installations used
Switching system "Worker-standby" between pumps and solenoid valves (daily).
Error signals relating to pressure values, tank fill levels, pump operation and solenoid valve are displayed on the SDS module control panel.

Deaeration

Deaeration in AUPD Flamcomat is based on the principle of pressure reduction (throttling, Fig. 2). When the pressure coolant is entered into an expansion tank of the installation (non-variable or atmospheric), the ability of gases to dissolve in water decreases. Air is distinguished from the water and is excreted through the aircraft installed in the upper part of the tank (Fig. 3). To remove from water as much air as possible, a special compartment is installed at the inlet of the coolant in the expansion tank
Pall rings: it increases deaeration ability 2-3 times compared to conventional installations.

In order to remove as greater gases as possible from the system, an increased number of cycles in the same way as an increased cycle time (both values \u200b\u200bdepend on the size of the tank), are introduced in advance to the installation program at the factory. After 24-40 hours, this turbo deaeration mode goes to normal deaeration mode.

If necessary, you can run or stop the turbo-de-deaeration mode manually (if there is an SDS module 32).

Safety

Automatic feeding compensates for the loss of the coolant, originating due to leaks and deaeration.
The level control system automatically activates the feed function when required, and the coolant in accordance with the program enters the tank (Fig. 4).
When the minimum level of coolant in the tank is achieved (typically \u003d 6%), the solenoid on the feed line opens.
The volume of the coolant in the tank will be increased to the required level (usually \u003d 12%). This will prevent the "dry" work of the pump.
When using a standard flow meter, the amount of water may be limited to the feeding time in the program. When this time is exceeded, it is necessary to take action to eliminate the problem. After that, if the feeding time did not change, the same volume of water can be added to the system.
In the installations where pulse flowmeters are used (optional), the feeding will turn off when the program is reached.

moved water volume. If the feed line
AUPD Flamcomat will be connected directly to the drinking water supply system, you must install a filter and a reverse stream protection (hydraulic cutter - option).

The main elements of the AUPD Flamcomat

AUPD FLAMCOMAT M0 GB 300

A. Bondarenko

The use of automatic pressure maintenance (AUDD) for heating and cooling systems was widespread due to the active growth of high-rise construction.

AUPD performs the functions of maintaining constant pressure, compensation of temperature extensions, deaeration of the system and compensation for the loss of the coolant.

But since it is quite new for russian market Equipment, many specialists in this area have questions: What are standard Aoupes, what are the principles of their action and the method of selection?

Let's start with the description standard installations. Today, the most common type of AUPD is installations with pump-based control unit. A similar system consists of a non-pressure expansion tank and a control unit that is interconnected. The main elements of the control unit are the pumps, solenoid valves, the pressure sensor and the flow meter, and the controller, in turn, ensures the AUPD control as a whole.

The principle of the AWD data is as follows: when heated, the coolant in the system is expanding, which leads to an increase in pressure. Pressure sensor fixes this increase and sends a calibrated signal to the control unit. Control unit (using a weight sensor (filling) constantly fixing the fluid level in the tank) opens the solenoid valve on the cross-line. And through it, the excess coolant flows from the system into the membrane expansion tank, the pressure in which is equal to the atmospheric.

Upon reaching a given pressure value in the system, the solenoid valve closes and overlaps the fluid flow from the system into the expansion tank. When cooled coolant in the system, its volume decreases, and pressure drops. If the pressure drops below the set level, the control unit turns on the pump. The pump operates until the pressure in the system rises to a specified value. Permanent control of the water level in the tank protects the pump from the "dry" stroke, and also protects the tank from overflow. If the pressure in the system goes beyond the maximum or minimum, one of the pumps or solenoid valves is triggered, respectively. If the performance of one pump in the pressure line is missing, the second pump is activated. It is important that the APD of this type has a security system: when one of the pumps or solenoid solenoids, the second must automatically be turned on.

The procedure for the selection of AUPD on the basis of pumps makes sense to consider on the example of practice. One of recently implemented projects - "Residential house on Mosfilmovskaya" (the object of the company "Don-Stroy"), in the central thermal paragraph. which is applied similar pump installation. The height of the building is 208 m. Its CTP consists of three functional parts corresponding to, respectively, for heating, ventilation and hot water supply. The heating system of the high-rise body is divided into three zones. Total settlement thermal power Heating systems - 4.25 Gcal / h.

We present an example of the selection of AUPD for the 3rd zone of heating.

Initial datarequired for calculation:

1) thermal power system (zone) N. Syst, kW. In our case (for the 3rd heating zone), this parameter is 1740 kW (source data of the project);

2) static height N. st (m) or static pressure R Art (bar) is the height of the fluid pillar between the point of connection of the installation and the highest point of the system (1 M of the liquid column \u003d 0.1 bar). In our case, this parameter is 208 m;

3) the volume of coolant (water) in the system V.l. For the correct selection of AUPD, it is necessary to have data on the volume of the system. If the exact value is unknown, the average value of the water volume can be calculated by the coefficients shown in tab. According to the project Water Volume 3rd Heating Area V. Sist is 24 350 liters.

4) temperature schedule: 90/70 ° C.

First stage. Calculation of the volume of the expansion tank to AUPD:

1. Calculation of the expansion coefficient TO rashes (%) expressing the increase in the volume of the coolant when he was heated from the initial to average temperaturewhere T. CP \u003d (90 + 70) / 2 \u003d 80 ° C. At this temperature, the expansion coefficient will be 2.89%.

2. Calculation of expansion volume V. Rasha (L), i.e. The volume of the coolant displaced from the system when it is heated to the average temperature:

V. Rasha \u003d. V. Syst. K. rashes / 100 \u003d 24350. 2.89 / 100 \u003d 704 liters.

3. Calculation of the calculated volume of the expansion tank V. B:

V. B \u003d V. rash. TO Zap \u003d 704. 1,3 \u003d 915 liters.
Where TO Zap - stock coefficient.

Next, select the expansion tank size size from the condition that its volume should be no less than the calculated one. If necessary (for example, when there are limitations on dimensions), the AUPD can be supplemented with an additional tank, breaking the total estimated volume in half.

In our case, the volume of the tank will be 1000 liters.

Second phase. Selection of the control unit:

1. Determination of the nominal working pressure:

R SIST \u003d N. System / 10 + 0.5 \u003d 208/10 + 0.5 \u003d 21.3 bar.

2. Depending on the values R SIST I. N. System Select the control unit using special tables or charts represented by suppliers or manufacturers. All models of control blocks can be included as one pump and two. In the AUPD with two pumps in the installation program, you can choose the operation mode of the pumps: "Basic / Standby", "alternate operation of pumps", "parallel operation of pumps".

This is the calculation of the AWD ends, and the project is prescribed the volume of the tank and the marking of the control unit.

In our case, the AUPD for the 3rd zone of heating should include a non-valve tank with a volume of 1000 liters and a control unit that will ensure maintenance of pressure in a system of at least 21.3 bar.

For example, for this project, AUPD MPR-S / 2.7 was chosen into two pumps, RU 25 bar and the MP-G 1000 tank 1000 FLAMCO (Netherlands).

In conclusion, it is worth mentioning that there are also settings based on compressors. But this is a completely different story ...

The article is provided by Adl

Pressure increase settings are pumping stationswhich includes from 2 to 4 multistage vertical BOOSTA pumps.

Boosta pumps are installed on a shared frame and interconnected suction and pressure pipelines. Connecting pumps to collectors is performed using shut-off reinforcement and check valves.

The control cabinet is fixed on the rack installed on the frame.

Pressure increase settings have various ways of regulation:

• Aoupe ... BOOSTA ... CR with multiple frequency converters.
  Pressure increases with 2 ÷ 4 BOOSTA pumps, a separate frequency converter is connected to each pump. All pumps operate with an adjustable rotational speed, on the same rev..
• Aoupe ... Boosta ... KCR with cascade-frequency control.
  Pressure increases with 2 ÷ 4 BOOSTA pumps, only one pump is equipped with a frequency converter. The remaining pumps are included depending on the requirements of the system and operate on constant turns.

Maintaining constant pressure is provided by regulating the frequency of rotation of the pump to which the frequency converter is connected.

June 1, 2007.

Almost for more than 5 years, Adl has been the exclusive distributor of the well-known European manufacturer's products - FLAMCO Concern (Netherlands). In previous issues of the magazine "Avok" ("Avok", №2, 2005) we already talked about the advantages, selection and operation of expansion tanks, safety valves, separators and air vents produced by FLAMCO. This equipment is established and successfully operated on tens of thousands of facilities throughout Russia, among which it is worth noting the following: Tretyakov Gallery, a complex of buildings of an old area, a large theater, a countable chamber, a building of the Foreign Ministry, Mamt (theater. K. S. Stanislavsky), Housing complexes of the Don-Stroy company. In this article, we will focus more on automatic installation of the Flamcomat pressure.

It's no secret that for big circulating systems The disadvantage of membrane expansion tanks are their dimensions. The fact is that on average the tank is filled with a coolant by only 30-60%, and smaller values \u200b\u200boccur just on the tanks of large volumes. Practically, this means the following: at objects where the calculated volumes of tanks make up several thousand liters, there is a serious problem with their placement in the operating room, so for such objects most often use automatic installations for maintaining the Flamcomat pressure. And if there is still a question about effective removal Gas from the system, then in such cases without installations no longer do.

Installation of pressure maintenance, mainly is a combination of a non-pressure expansion tank and a pump pressure control unit based on pumps. With an increase in the temperature of the system, a solenoid valve opens, which shifts the excess coolant from the system to the tank, and when the temperature decreases, the coolant from the tank pumps the pumps back into the system. Thus, the installations can maintain pressure in the system in fairly narrow, predetermined limits. In addition, the non-valve tank can be almost completely filled with a coolant, which makes the installation of pressure several times more compact than ordinary expansion tanks.

Installations can be equipped with the main expansion Baku The volume of 150 to 10,000 l, while maintaining the working pressure in the system to 145 m. It is worth noting that if necessary, when there are limitations on dimensions, the installation can be supplemented with a second tank, breaking the total calculated volume in half. The maximum operating temperature acting on the membrane is no more than 70 ° C.

In the Flamcomat setting, 3 main functions are combined: maintaining pressure in the narrow range (control hysteresis +/- 0.1 bar), deaeration of the coolant, feeding.

Flamcomat pressure maintenance installations have been successfully "fighting" with a well-known way to any specialist problem of the problem of the coolant. The Flamcomat pressure maintenance facilities are based on the principle of micropuling deaeration (chokesetting): when the coolant under high pressure of the system is included in the expansion tank of the installation (without pressure), the ability of gases to dissolve in water decreases, and excess air is removed. In order to remove from the coolant, and, accordingly, from the system, as much air, an increased number of cycles as well as an increased cycle time is introduced in advance to the installation program at the factory. After 2440 hours, this turbo-de-deaeration mode goes to normal deaeration mode. At the entrance to the expansion tank, a special compartment is installed with PALL-rings (international patent No. 0391484), which very effectively remove air from the coolant. Due to this, the deaerational ability to maintain the Flamcomat pressure maintenance increases by 2-3 times compared to conventional installations, especially important at the time of the first start of the system. Do not forget about the economic side of the issue, the effective deaerational ability of the installation makes it possible to abandon the use of expensive deaeration air separators or time-consuming deaeration manually.

The standard setting of the Flamcomat installation includes an automatic feedback, which compensates for the losses originating due to leaks and deaeration. The level control system automatically activates the feed function when required, and the volume of the coolant in accordance with the program enters the tank. When the minimum level in the tank is achieved (usually 6%), the solenoid valve on the feed line opens and the tank is filled to the required level (usually 12%), which makes it possible to prevent the operation of the "dry" pump. The pressure maintenance unit also includes a flow meter installed on the feeding line to determine the number of leaks in the system.

The following question was relevant in the recent past: which pressure maintenance settings can be used for high-rise buildings up to 240 m?! FLAMCO has released the lineup Installations FlexCon MPR-S (Russia Special / Especially for Russia), in which the wishes of Russian urban planners were taken into account, in particular the well-known company of Don-Stroy LLC. Currently, the above-mentioned pressure maintenance plants are successfully operated in high-rise buildings, for example, the highest building in Russia and in Europe - Triumph Palace, Chapaevsky per. Vl. 3, building height \u003d 264 m, m. Falcon.

MPR-S installations are equipped with an expansion tank with a volume of from 200 to 5,000 liters, while maintaining pressure up to 240 m.

All installation models can be included both 1 and 2 pumps. In the installations with 2 pumps in the installation program, you can choose their operation mode: basic / standby, alternate operation of pumps, parallel operation of pumps.

In conclusion, it is worth noting that FLAMCO today is a leading manufacturer of such equipment that meets all the most modern requirements engineering systemsNamely: impeccable quality, efficiency, convenience and simplicity of maintenance.

More detailed information You can get on the automatic installations and other FLAMCO equipment from the engineers of the pipeline fittings of the general industrial application of the company ADL. We also draw your attention to a specialized catalog " Automatic installations maintaining pressure "in which you will find all the necessary technical information By this product.

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