Pump controlled pressurisation system

 

About the pump controlled pressurisation system

The pump controlled pressurisation system is also called the pressure maintenance system with pumps,the pressurisation system with pumps,the automatic constant pressure water supply device and pump controlled pressurisation system with vacuum deaerator. This relates to devices with or without air charging:pump controlled pressurisation unit with pressure tank & pump controlled pressurisation unit with expansion tank.

Operating principle of the pump controlled pressurisation system

The automatic pump controlled pressurisation unit with pressure tank adopt the system of static pressure as the initial design pressure head,so that the system is always under normal operating pressure.During initial operation,the make-up pump is started at first to fill the system and the bladders in the pressure tank with water,and excess water is squeezed into the bladders after the system is full.Because water is not compressible,the water chamber is continuously expanding along with the incoming water,so the air chamber is compressed, thereby causing the pressure in the tank to rise higher and higher.When the pressure reaches the set point,the make-up pump is shut off  by a pressure controller.If the water in the system causes expansion so that the pressure in the system exceeds the set point,excess water will be drained off through a solenoid valve.If the water volume in the system decreases caused by a leak or temperature drop so that the pressure in the system decreases, water in the bladders is injected into the pipeline to supplement the pressure drop in the system;when the system pressure reaches the design minimum level,the make-up pump is started again by the pressure controller to inject water into the pipeline and the bladders.It goes full circle.

The fundamental functions of the automatic pump controlled pressurisation unit with expansion tank are to stabilize pressure and make-up water.An intelligent control system delivers proper coordination between the pump and the series of solenoid valves.Through the use of various sensors,an accurate pressure maintenence and the automatic make-up water are achieved.In addition, a fundamental function of the automatic pump controlled pressurisation unit with expansion tank is the obvious degassing function.Following the principles of physics,it releases water from the system into the expansion diaphragm tank for degassing,which may solve problems for water circulation.

The automatic pump controlled pressurisation system can be used with the vacuum deaerator;they are the automatic pump controlled pressurisation unit with pressure tank & vacuum deaerator device  and the automatic pump controlled pressurisation unit with expansion tank & vacuum deaerator device.Water which is rich in gas in the system enters into the vacuum degassing tank,and is drawn back to the system by the pump.Because water capacity is reduced in the vacuum degassing tank,gas separated out from water is expelled by an automatic exhaust valve,thereby the degassing problem in a water system is comprehensively solved.

Functions of the pump controlled pressurisation system

1. Pressure maintenence: When the temperature of a medium increases by heating,its volume expands,therefore the pressure in the whole system increases.When the opening pressure of the release solenoid valve is reached,the one in the pump controlled pressurisation system opens to release the medium expanded by the rising temperature in the system into the expansion tank to stabilize the pressure in the system.

2. Water make-up: The temperature and volume of hot water decrease after passing through the radiator,and the pressure in the system also decreases.When the pressure drops down to the starting pressure of the make-up pump,it draws water in the expansion tank or other peripheral water supply to the system in order to stabilize pressure in the system.

3.Deaerator:To degas water in the system or from the system in a vacuum,to remove solution gas,free gas,bubbles and so on,thereby protecting the pump controlled pressurisation system and allowing the system to operate in a safe and stable environment.

4. Softening: There is a water softening device (optional) in the water make-up pipe of the system,which may soften refilled water outside the system.

Outside view of the pump controlled pressurisation system

pump controlled pressurisation unit with expansion tank

pump controlled pressurisation unit with expansion tank

pump controlled pressurisation unit with pressure tank

pump controlled pressurisation unit with pressure tank

Side view of automatic pump controlled pressurisation unit with expansion tank & independent vacuum deaerator

Side view of automatic pump controlled pressurisation unit with expansion tank & independent vacuum deaerator

Front view of automatic pump controlled pressurisation unit with expansion tank & independent vacuum deaerator

Front view of  automatic pump controlled pressurisation unit with expansion tank & independent vacuum deaerator

Side view of automatic pump controlled pressurisation unit with pressure tank & independent vacuum deaerator

Side view of automatic pump controlled pressurisation unit with pressure tank & independent vacuum deaerator

Front view of automatic pump controlled pressurisation unit with pressure tank & independent vacuum deaerator

Front view of automatic pump controlled pressurisation unit with pressure tank & independent vacuum deaerator

Advantages of pump controlled pressurisation system

Advantages of pump controlled pressurisation unit with pressure tank

1.High stabilizing accuracy, ±0.01mpa(±0.1bar)available.
2.Automatic water make-up,low requirements for system water make-up pressure,direct connection to the tap water system or other water supply allowable.
3.Pressure release at a set point,system safety guaranteed.
4.Total isolation of the system from the air,with no air pollution from A/C water system guaranteed.
5.Aerating once for long term use.
6.Convenient installation and use,automatic operation,safe and reliable,and easy to maintain.

Advantages of pump controlled pressurisation unit with expansion tank

1.Use expansion tank,which is unpressurized equipment with better safety than pressure equipment.
2.The effective water capacity of the diaphragm bladder is almost equal to the total volume of the shell of the water tank,while the volume is only 1/3 of the expansion tank with the same regulating capacity.
3.No inert gases are necessary outside the diaphragm bladder,so it has better applicability,saving labor and materials.
4.The water tank adopts the bladder-type structure,pressure stabilizing force fluctuates along with expansion and shrinkage of the bladder,no direct contact between the medium and the carbon steel shell, with the result that the expansion tank remains rust-free for a prolonged period.
5.The rubber bladder volume in the expansion tank can reach more than 90% of the tank volume,with respective economies on the size and cost.
6.The system pressure can be measured by the pressure transmitter in real time.
7.The PLC intelligent control box.
8.The rubber bladder in the tank is fed from the municipal water supply system.
9.With a small floor area,convenient installation and use,fully automatic operation,safe and reliable and easy to maintain.

Advantages of the vacuum deaerator

1.Automatically degasses free gas and dissolved gas in the system.
2. The degassing efficiency and the deoxidizing efficiency is >99%.
3. Removes gases in the system to avoid air resistance,and guarantees stability and reliability during normal operation of the system.
4. Since oxygen is eliminated from the water,aerobic corrosion in the system is reduced,the service life of the pump controlled pressurisation system is prolonged.
5. Since gas is eliminated from the water,bubbles on the surface of the heat exchanger are substantially reduced,and the heat efficiency is increased.
6. The operating time and period of the deaerator can be adjusted as required.

Application range of pump controlled pressurisation system

1.The water circulation system of a heating boiler.
2.The water circulation system of an A/C for chilling.
3.The water circulation system of an A/C for cooling.
4.The heating and cooling system of a hotel,hospital,public amenity,office building and so on.
5.The closed circulation system for liquid process heating and cooling at a factory.
6.Other necessary water circulation systems.

Specification table for the pump controlled pressurisation system 

I. Specification table for the pump controlled pressurisation unit with expansion tank

Designation of  the pump controlled pressurisation unit with expansion tank

Designation of the pump controlled pressurisation system with expansion tank

Specification table of the pump controlled pressurisation unit with expansion tank

Model Maximum power

(kw)

Pressure equipment(bar) Inlet diameter

(mm)

 

Outlet diameter(mm)

Length

(mm)

Width

(mm)

Height

(mm)

DYC

2-2/20-XX-6

1.1 6 DN25 DN25 850+

expansion tank

diameter

 

≥expansion tank diameter

expansion tank height
DYC

2-2/30-XX-6

1.1 6 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/40-XX-6

1.1 6 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/50-XX-10

1.5 10 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/60-XX-10

2.2 10 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/70-XX-16

2.2 16 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/90-XX-16

3.0 16 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/110-XX-16

3.0 16 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/150-XX-16

4.4 16 DN25 DN25 850+

expansion tank

diameter

DYC

2-2/180-XX-20

6 20 DN25 DN25 850+

expansion tank

diameter

Remark: The diameter of the expansion tank depends on its particular function.

 

II. Specification table for the pump controlled pressurisation unit with pressure tank

Designation of the pump controlled pressurisation unit with pressure tank

Designation of the pump controlled pressurisation unit with pressure tank

 

Specification table of the pump controlled pressurisation unit with pressure tank

Model Maximum power

(kw)

Pressure equipment(bar) Inlet diameter

(mm)

Outlet diameter

(mm)

Length

(mm)

Width

(mm)

Height

(mm)

DYQ

2-2/20-XX-6

 

1.1

6 DN25 DN25 850+

pressure tank diameter

 

≥pressure tank diameter

 

pressure tank height
DYQ

2-2/30-XX-6

1.1 6 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/40-XX-6

1.1 6 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/50-XX-10

1.5 10 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/60-XX-10

2.2 10 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/70-XX-16

2.2 16 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/90-XX-16

3.0 16 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/110-XX-16

3.0 16 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/150-XX-16

4.4 16 DN25 DN25 850+

pressure tank diameter

DYQ

2-2/180-XX-20

6 20 DN25 DN25 850+

pressure tank diameter

Remark: The diameter of the pressure tank depends on its particular function

 

III. Specification table for the pump controlled pressurisation unit with expansion tank & vacuum deaerator device

Designation of the pump controlled pressurisation unit with expansion tank & vacuum deaerator device

Designation of the pump controlled pressurisation unit with expansion tank & deaeration device

Specification table of the pump controlled pressurisation unit with expansion tank & vacuum deaerator device

Model Maximum power

(kw)

Pressure equipment(bar) Inlet diameter

(mm)

Outlet diameter

(mm)

Length

(mm)

Width

(mm)

Height

(mm)

DYCZ

2-2/20-XX-6

1.1 6 DN25 DN25 850+

expansion tank diameter

 

expansion tank diameter

expansion tank height
DYCZ

2-2/30-XX-6

1.1 6 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/40-XX-6

1.1 6 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/50-XX-10

1.5 10 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/70-XX-10

2.2 10 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/90-XX-16

2.2 16 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/110-XX-16

3.0 16 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/130-XX-16

3.0 16 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/150-XX-16

4.4 16 DN25 DN25 850+

expansion tank diameter

DYCZ

2-2/180-XX-20

6 20 DN25 DN25 850+

expansion tank diameter

 

Remark: The diameter of the expansion tank depends on particular case

 

IV.Specification table for the pump controlled pressurisation unit with pressure tank & vacuum deaerator device

Designation of the pump controlled pressurisation unit with pressure tank & vacuum deaerator device

Designation of the pump controlled pressurisation unit with pressure tank & deaerator device

Specification table of the pump controlled pressurisation unit with pressure tank & vacuum deaerator device

Model Maximum power

(kw)

Pressure equipment(bar) Inlet diameter(mm) Outlet diameter

(mm)

Length

(mm)

Width

(mm)

Height

(mm)

DYQZ

2-2/20-XX-6

1.1 6 DN25 DN25 850+

pressure tank diameter

 

pressure tank diameter

pressure  tank height
DYQZ

2-2/30-XX-6

1.1 6 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/40-XX-6

1.1 6 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/50-XX-10

1.5 10 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/70-XX-10

2.2 10 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/90-XX-16

2.2 16 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/110-XX-16

3.0 16 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/130-XX-16

3.0 16 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/150-XX-16

4.4 16 DN25 DN25 850+

pressure tank diameter

DYQZ

2-2/180X-X-20

6 20 DN25 DN25 850+

pressure tank diameter

Remark: The diameter of the pressure tank depends on its particular function.

 

Installation diagram of the pump controlled pressurisation system

Installation diagram of automatic pump controlled pressurisation unit with expansion tank

Installation diagram of automatic pump controlled pressurisation unit with expansion tank 

Installation diagram of automatic pump controlled pressurisation unit with expansion tank & vacuum deaerator device

Installation diagram of automatic pump controlled pressurisation unit with expansion tank & vacuum deaerator device

 

 

Installation diagram of automatic pump controlled pressurisation unit with pressure tank

Installation diagram of automatic pump controlled pressurisation unit with pressure tank

Installation diagram of automatic pump controlled pressurisation unit with pressure tank & vacuum deaerator device

Installation diagram of automatic pump controlled pressurisation unit with pressure tank & vacuum deaerator device

Site pictures for some examples of pump controlled pressurisation system

pump controlled pressurisation system case1

Application: Chilled water system and winter heating hot water system for central A/C
Client: The Memorial Hall of The Victims in Nanjing Massacre by Japanese Invaders
Core advantages: Low pressure fluctuation,stable,reliable,easy and simple to maintain
Overview of equipment: Model of pump controlled pressurisation system DYZ2-3/40-1.0/700
Pump specifications: Multistage SS centrifugal pump,discharge of 3T/H,lift of 40m,power of 0.75KW, one in service and the other on standby
Expansion tank: Carbon Steel,diaphragm built-in,anticorrosion spring;total volume:φ700 ,600L;effective volume 540L
Model of automatic water-softening treatment unit: JF2750ST-500
Operation mode: Single-valve single-tank time type (With hard water bypass)
Water treatment capacity: 3-5T/H
Tank dimension: Φ500×1750*1

Click here for detailed installation and commissioning of pump controlled pressurisation system on site >> 

pump controlled pressurisation system case2

Application: Hot water system for water-circulation process
Client: Novelis (China)
Core advantages: Central control,needs no site inspection,modular design,low-cost
maintenance
About pump controlled pressurisation system:
pump controlled pressurisation unit with expansion tank,the pressure maintenence point: 0.65Mpa,the releasing point:0.85Mpa,pressure for safety valve open: 0.935Mpa,
water-softening make-up regulating volume: 1200L
About the project: Novelis is the world leader in rolled aluminum products,also the largest manufacturer of recycled beverage cans.The investment for Phase I is USD150, 000,000, and the annual output of automobile aluminum plates is 120,000MT.

pump controlled pressurisation system case3

Application: Constant pressure regulation for A/C chilled water and hot water
Client: The building of Changzhou Bank of Communications
Core advantages: Fully automatic central control,the effective utilization of the pressure tank is up to 55%,stable and reliable control.
About pump controlled pressurisation system: pump controlled pressurisation unit with pressure tank, the pressure maintenence point: 1.1Mpa, the release point: 1.21Mpa, pressure for safety valve open: 1.33Mpa, regulating volume: 1500L
About the project: The headquarters of Changzhou Bank of Communications and Changzhou Ping An Bank, with a floor area about 40,000㎡, a business office building.

pump controlled pressurisation system case4

Application: Hotel hot water system
Client: Dusit D2 Binhu Changzhou Hotel
Core advantages: Fully automatic central control,the effective utilization of the pressure tank is up to 55%,stable and reliable control.
About pump controlled pressurisation system: pump controlled pressurisation unit with pressure tank,the pressure maintenence point: 0.4Mpa, the releasing point: 0.44Mpa, pressure for safety valve open: 0.484Mpa, regulating volume: 1000L
About the project: A high-end tourist hotel, with a floor area of about 15,000㎡

Requirements for installation of the pump controlled pressurisation system 

Applicable system pressure: 0.1-2.0Mpa
Water pressure: ≥0.1Mpa
Ambient temperature: +5℃~+40℃
Power supply: 380V/50Hz
Place of installation: Indoors
The distance between the vacuum deaerator discharge outlet and the water make-up inlet of automatic pump controlled pressurisation unit with pressure tank & vacuum deaerator device is more than 2m.

Precautions for installation and commissioning of the pump controlled pressurisation system and the maintenance plan 

Precautions for installation and commissioning of the pump controlled pressurisation system

1.The pump controlled pressurisation system can be placed in the basement heating room or the interlayer of the foundation. Since the small bore tubing which is used in the equipment is liable to frost damage, never locate it outdoors, or normal function will be impaired.
2.There should be a stable and reliable power supply, or proper technical measures should be used.
3.The exhaust pipe connects with the water make-up pipe at the return main pipe on the suction side of the system pipeline circulating pump. The exhaust pipe should be connected first according to the flow direction, and then the water make-up pipe at a distance of 2m.
4.A pressure of 0.1MPa at the joint of the water make-up pipe is acceptable. If the water make-up pressure cannot meet this requirement, other technical measures should be used.
In order to avoid sewage entering the device, the pipeline should be connected from the top. The pipe connection plan I is shown as follow:

pipe connection plan of pump controlled pressurisation system

If connecting the pipeline from the bottom,the connection pipe should be embedded in the system pipe,as shown above in Pipe connection plan II.

1.The distance between the pump controlled pressurisation system and the wall or other equipment should not be less than 0.7m.
2.The pump controlled pressurisation system should be located in a room with good ventilation,and the room temperature should be 5C-40C;if the device is installed outdoors with the risk of chilling,measures for weather-proofing and anti-chilling should be considered.
3.After installation,the water pressure test for strength and the leak test should be performed according to the design requirements and relative provisions.
4.After the pressure tank passes the water pressure test for strength and the leak test, it should be debugged according to the design requirements.After debugging,there should be no leak at the air charging connector.
5.It is not necessary to assign a dedicated person to supervise the procedure of pump controlled pressurisation system passes the commissioning tests and is put into service,but regular routine inspection is required.

Maintenance plan for the pump controlled pressurisation system

1.Clean the Y-filter in the pipeline regularly (once per month at the beginning, and once every two months after normal operation).
2.Turn the safety valve several times per month to ensure that it functions normally.
3.For a pump controlled pressurisation unit with expansion tank, adjust the water quantity in the tank at a time when the set pressure is changed.
4.Adjust the water quantity when seasons change (Spring and Autumn), and change the water in the system at the end of the season.
5.In case of any grinding noise from the pump, check for damage to the impeller and the vane of the pump.Change lubricant once per year for the pump.
6.After all normal maintenance has been done, perform the normal operating tests of all functions until all functions run normally.

Package for delivery of the pump controlled pressurisation system

Package for delivery of the pump controlled pressurisation system1

Package for delivery of the pump controlled pressurisation system2

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Type selection of pump controlled pressurisation system & vacuum deaerator

 

 

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