Automatic counter-flushing water strainer
Usage specification
(Mechanical)
WUXI HUATONG EP. EQUIPMENT CO.，LTD
2007.1
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
Table of Contents
1 Introduction .............................................................................................................................. 3
2 Function ..................................................................................................................................... 3
3 Technical features and technical specifications ..................................................................... 3
4 Working principle and structure features .............................................................................. 7
5 Water pipe system..................................................................................................................... 8
6 Monitoring system and operation mode ................................................................................. 9
7 Installation requirements ....................................................................................................... 11
8 Operation requirements ......................................................................................................... 12
9 Maintenance ............................................................................................................................ 13
10 Transportation and storage ................................................................................................. 13
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
2
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
1 Introduction
The full-automatic and counter-flushing electric-driven water strainer of model LS902 is a kind
of new generation product based on design, manufacturing and operation experience of former
product and absorbing advanced technology of similar products in China and other countries by
Wuxi Huatong EP Equipment Co., Ltd. The product is of high technology, and meets the
demand of supporting and technology improvement for power plant and nuclear plant with
introduced or imported machine group.
2 Function
The full-automatic counter-flushing water strainer of model LS902 is specially designed for
power plant or nuclear plant, which is applicable for water straining for plant taking seawater or
fresh water as cooling water source to prevent solid particles and dirt water from entering the
downstream water consumption system and equipment, and purifies the water and protects the
equipment for safe operation.
3 Technical features and technical specifications
3.1 Technical features
3.1.1 Flow area of the strain net is large, the resistance is small and the cleaning cycle is long.
3.1.2 Complete cleaning system: besides the counter-flushing equipment of automatic control,
cleaning measures are used without opening the big cover (strainer with larger diameter) to
ensure operation, easy maintenance and improve utilization rate.
Counter-flushing is featured in small water quantity, good cleaning effect and water saving.
3.1.3 To perform cleaning without opening the big cover, the equipment against water splashing
are equipped for the motor and electric devices (installed close to the electric-driven strainer
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
3
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
and electric equipment).
3.1.4 The equipment is designed for seawater, and surface of the water flow employs 316L:
stainless steel of sound seawater corrosion resistance.
3.1.5 Automatic control function of the equipment is complete, and the supporting parts are of
high quality.
a. The automatic control system employs DCS system control of the control cabinet
manufacturer. Other components, like AC contact, thermal protection relay are made outside
China, the pressure difference switch is from SOR, America and the pressure difference
transmitter is from ROSEMOUNT, America. The practice proves that it has high reliability and
service life and utilization rate are highly increased.
b. Complete automatic control functions:
Automatic control mode: resistance over-pressure cleaning system for automatic
operation and lock..
Set interval and operation time for automatic operation and lock.
Long-term cleaning system.
Manual mode: manual electric-driven mode to operate strainer rotation, valve opening,
valve closing and etc.
3.2 Technical specifications:
No.
Item
Unit
Data
Remark
Vertical full-automatic
1
Type
counter-flushing water strainer
2
Model
LS902AS0.4-500
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
4
电动滤水器
Automatic counter-flushing water strainer
3
使用说明书
operational manual
Working media
Seawater
Nominal diameter of
4
mm
DN500
MPa
0.4
MPa
0.4
MPa
0.6
m3/h
1700
MPa
0.004～0007
mm
DN125
inlet and outlet
Maximum working
5
pressure
6
Design pressure
Water pressure test
7
pressure
8
Rated flow
Resistance under
9
rated flow and
cleaning conditions
Counter-flushing
10
sewage drainage
door
11
Straining precision
mm
2
12
Flowing rate
Times
6
M
For earthquake of 7 degree
r/m
1.1
Performance against
13
earthquake
Revolution of water
14
strainer
16
Main drive structure
Germany SEW motor+ reducer
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
5
电动滤水器
Automatic counter-flushing water strainer
17
Motor power
使用说明书
operational manual
Kw
0.37
Stream trap valve
18
Manual ball
G2’’
mm
for stop
valve
Pressure difference
20
SOR
gauge
Model
101NN-K3-H4-C1A-TTX371
Setting range of
pressure difference
MPa
0.025～0.10
value
Maximum value of
Lower limit 0.02/Upper limit
switching pressure
MPa
0.21
difference
Pressure gauge
21
ROSEMOUNT
switch
Model
3051CD3A23A1AB4DF
Setting range of
pressure difference
MPa
0.025～0.10
value
Maximum value of
Lower limit-0.248/Upper limit
switching pressure
MPa
0.248
difference
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
6
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
Maximum pressure
22
resistance of
MPa
0.1
MPa
0.6
kg
～2120
filtration net
Pressure level of
flanges for water
23
incoming and
outgoing
24
Net weight
4 Working principle and structure features
4.1Working principle
The circulating water enters the lower cabinet of the shell through the lower incoming flange,
flows into internal part of the wire winding tube of the cylinder and the filtrated water is
collected at the external part of the wire winding tube and flows out from the upper flange. The
dirt is trapped on the internal wall surface of the wire winding tube. When counter-flushing is
performed, the water enters external part of the wire winding pipe in reverse flow. The sewage
with dirt flows into water drainage point with low pressure from the drainage outlet for
counter-flushing at the lower part.
The filtration component is made up of 18 wire winding pipes, which correspond to 18 holes.
During continuous rotation of the strainer, it opens and closes continuously to form pulse water
flow, which increases impulsive force and improves counter-flushing. For the strainer is divided
into many wire winding pipes, it needs less water and saves water.
4.2 Structure features:
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
7
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
The strainer is vertical and cylinder structure. The water incoming flange is at the lower part
and the water outgoing flange is at the upper part of the other side. Manhole is set on the shell
(the strainer with small diameter is flat hole) for clearing. The wire winding pipe for filtration is
easy to be replaced during overhaul after opening the big cover. Besides drive unit on the
straining net, the joint for discharging air is set and sewage drainage port for counter-flushing is
set at lower part of the shell.
The drive unit for driving the strainer is inclined gear reduction device RF97R57DT71D4 made
by SEW Company of Germany, which is featured in compact structure, high efficiency, low
noise, long service and etc.
For the circulating water is seawater, 316L（00Cr17Ni14Mo2）of American standard is used.
To reduce leakage as much as possible, upper and lower part of the strain net is equipped with
sealing ring. Bearing on the rotating shaft of the strain net is made of oil-free bearing of 316L.
5 Water pipe system
Incoming water of the strainer is from outlet of the circulating pump or the pressure increasing
pump. The filtrated water is transported to thermal exchanger or other water consumption
devices. The sewage for counter-flushing is connected to the circulating outgoing water pipe
system of the condenser to make the water drainage point at lower pressure to form large
pressure difference with designed value of 0.04Mpa or above. Low pressure difference will
affect the counter-flushing. Two valves in series connection will be set on the drainage pipe for
counter-flushing. One is electric-driven ball valve, which is connected to control system of the
equipment to open or close the counter-flushing pipe. The other is manual ball valve (not
supplied by the manufacturer) for flow adjustment and flow control. Strainer of the system will
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
8
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
consume about 5% of the rated flow for counter-flushing, which has something to do with dirt
and the drainage system. When the above water is drained, water supply of downstream
equipment will be slightly affected.
Schematic diagram of water pipe of electric-driven strainer
进水 Incoming water
放空气 Discharge air
出水 Outgoing water
反冲洗污水 Sewage for counter-flushing
停机放水 Drain during stoppage
6 Monitoring system and operation mode
6.1 Automatic programming system:
The system employs PLC as core control component, greatly improves reliability of the control
system, simplifies the system, improves performance and extends service.
6.2 Operation mode:
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
9
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
6.2.1Full-automatic operation:
6.2.1.1When dirt in the inside surface of the straining net reaches specified extent, pressure
difference value of inlet and outlet exceeds setting value of the pressure difference transmitter,
the pressure difference switch (pressure difference transmitter) sends signals, and the
counter-flushing system starts, the drive structure rotates and the sewage drainage valve for
counter-flushing is opened. After washing, when the pressure difference is below the setting
value, after one minute’s delay, the counter-flushing system stops and the sewage drainage
valve is closed.
Setting value of the pressure difference switch (pressure difference transmitter):
0.025MPa(2.5mH2O)
See attachment 1 on technical specifications, use, commissioning and installation requirements
of the pressure difference switch (pressure difference transmitter).
6.2.1.2 According to dirty extent in the power plant, interval between two operations and
operation time of counter-flushing can be set for automatic cleaning circularly.
Adjustment range of the interval is 1-99hours, with default setting 6 hours.
When the machine is put into operation, counter-flushing system shall be used first. The
straining net rotates and the sewage drainage valve for counter-flushing is opened. After
finishing, the straining net stop rotating and the sewage drainage valve for counter-flushing is
closed.
6.2.2Manual operation:
Set the selection switch at the manual position and the automatic control system is locked.
Manual control operation is available to control each point separately and the automatic control
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
10
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
system and protection function are not available.
6.3 Automatic programming device (control box)
The device adapts PLC as core component including starting, protection component, switch and
etc. of the motor, and is an independent system. The power supply of 400V, 3 phases and 50Hz
is connected.
The control box is installed locally.
6.4 Instrument monitoring system:
6.4.1 Pressure gauges are installed at the inlet and outlet to monitor pressure of the outgoing
and incoming water.
6.4.2 Setting of pressure difference switch (pressure difference transmitter) is automatic control
system with required monitoring adjustment to ensure that the automatic operation is performed
as required.
6.4.3 To ensure accurate pressure adjustment, protection measures are employed at the pressure
sampling point of the water inlet and outlet to avoid block.
7 Installation requirements
7.1Overall check shall be performed for the equipment. The water inlet is set at the lower part
and the water outlet is set at the upper part, which can not be connected oppositely.
7.2The connecting parts like foundation size, embedded part and foundation bolt shall be
checked.
7.3To keep the strainer vertical, adjust it with mat iron. Electric welding machine is used to
weld the mat iron firmly, after tighten the foundation bolt, secondary pouring can be performed.
7.4 Fill in lubricant as per instructions for the reducer.
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
11
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
7.5 To ensure water pressure difference for counter-flushing, according to requirements of water
pipe system, sewage drainage point shall be paid attention to and low pressure point shall be
selected as much as possible.
7.6Wiring shall be carried out according to connection requirements of the control box,
electric-driven device of valve and drive motor of the reducer and the grounding wire joint must
be focused on.
7.7After the circuit is ready, test insulation and grounding wire are conformed or not, then get
through the power supply.
7.8Test shall be performed for varieties of working conditions of the control box (See
attachment 1).
7.9Adjust interval and operation time of circulating flushing according to requirements
stipulated in instruction manual for the automatic control device.
7.10Check operation conditions, interval and continuous time and confirm the water strainer is
blocked or not. Opening and closing of the valve shall be normal and there should be no
leakage on all the sealing surfaces.
7.11The machine can be put into operation after all the troubles are removed.
8 Operation requirements
8.1After installation, the working conditions must be normal.
8.2Open the air drainage valve, open the water incoming valve of the strainer slightly, after
residual air in the shell of the water strainer is completely pressed out by the water in the shell,
then there is no air in the air drainage valve, then open the water incoming valve and close the
air valve. Get the control box powered, the strainer is ready, open the outlet valve and the
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
12
电动滤水器
Automatic counter-flushing water strainer
使用说明书
operational manual
strainer should be in normal operation.
8.3After the strainer stops, close the inlet and outlet valves and sewage drainage valve for
counter-flushing, and open the air drainage valve and water drainage valve of the shell.
8.4To reduce sewage drainage amount for counter-flushing, one manual ball valve is installed
after the electric-driven sewage drainage valve for counter-flushing. Adjust sewage drainage
amount, generally, the valve shall be 56% opening when starting.
9 Maintenance
9.1The fillings shall be replaced according to leakage of fillings of the main shaft of the water
strainer. The fillings shall be replaced in case of overhaul and sealing pad of the valve rod of the
water pipe system shall be handled according to the above methods.
9.2Lubricant shall be replaced regularly for the reducer. See the instruction manual for the
reducer for the procedures.
10 Transportation and storage
10.1 During transportation, collision shall be avoided, otherwise, it may lead to deformation or
damage. Fix the product on the transportation tool with rope.
10.2Besides the requirements stipulated in 10.1, damp-proof is required for the motor,
electric-driven valve, automatic control device and other electric components, and
vibration-proof is available for the automatic control box.
10.3All the components in the equipment shall be placed in the ventilated cabinet. The electric
equipment shall be placed in the electric or instrument warehouse.
 无锡市华通环保设备有限公司 WUXI HUATONG EP EQUIPMENT CO.，LTD
 地址(Add)：无锡市江海东路 1899 号 1899 No. Jianghai east road ，wuxi city ，Jiangsu Province， China
 电话(Tel)：0510-82100129,  传真(Fax)：0510-82126280,
 邮编(Post code)：214027, E-mail: hthb@vip.163.com
HTHB(JG).05.07-2007-01
13