This standard specifies the test methods for the automatic control devices of the cooling water system of the main and auxiliary diesel engines on board. This standard is mainly applicable to ocean-going ships, and can also be used as a reference for other ships. CB/T 3777-1996 Test methods for automatic control devices of ship cooling water systems CB/T3777-1996 Standard download decompression password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB/T3777-1996
Test Method for Automatic Control Device of Ship Cooling Water System Issued on 1996-12-23
Easy Niu Dao Ke Processing-Website Transfer PD
Implementation on 1997-06-01
Shipbuilding Industry Standard of the People's Republic of ChinabZxz.net
Test Method for Automatic Control Device of Ship Cooling Water System 1 Subject Content and Scope of Application
CB/T3777--1996
Classification Number: U13
This standard specifies the test method of automatic control device of ship main and auxiliary diesel engine cooling water system on board. This standard is mainly applicable to ocean-going ships, and other ships can also refer to it. 2 Reference Standards
GB3471 General Rules for Mooring and Navigation Tests of Seagoing Ships 3 Test Items
3.1 Remote control start and stop test of cooling water pump group. 3.2 Automatic conversion test of cooling water pump group. 3.3 Automatic start and stop test of cylinder jacket water preheating circulating water pump group. 3.4 Automatic cooling water temperature adjustment test.
3.5 High temperature alarm test of cylinder or injector cooling water. 3.6 Safety protection test of cylinder cooling water over-temperature. 3.7
Safety protection test of piston cooling water outlet high temperature. 3.8
Alarm test of cylinder or injector cooling water pressure (or flow). Safety protection test of cylinder cooling water pressure (or flow). Safety protection test of piston cooling water inlet low pressure. Safety protection test of piston cooling water outlet low flow. Automatic fresh water replenishment test of expansion water tank.
Expansion water tank liquid level alarm test.
4 Test preparation
4.1 The test environment conditions of the cooling water system automatic control device specified in this standard shall comply with the test general requirements of GB3471. 4.2 Before the test, the following items should be checked and confirmed: Make an appearance inspection of the entire cooling water system, check the integrity of each component of the system and the correctness of the layout and installation. a.
The installation position of the detection instrument of the automatic control device should meet the design requirements. b.
The power supply voltage and frequency used by the automatic control device should meet the design requirements. 5 Test method
5.1 Remote control start and stop test of cooling water pump group
The remote control start and stop test of cooling water pump group should meet the following requirements: Use the remote control start and stop button to test the start and stop effectiveness of the pump, and the pump should work normally; a.
Check the operation indicator light of the cooling water pump group installed in the control room and other places, and it should work normally. b.
Approved by China State Shipbuilding Corporation on December 23, 1996, and implemented on June 1, 1997
5.2 Automatic switching test of cooling water pump group
CB/T3777-1996
5.2.1 The automatic switching test of cooling water pump discharge pressure drop shall meet the following requirements: a.
Connect the cooling water pump group (referred to as pump No. 1) and the standby cooling water pump group (referred to as pump No. 2) to the power supply, and the power indicator light will be on b.
Check the pressure value set by the pressure switch, which shall meet the design pressure value requirements; c.
Manually start pump No. 1 After that, the operation indicator light of the pump will light up, and the discharge pressure of the pump should be normal. Then, both pumps 1 and 2 will be placed in the "automatic" position;
Adjust the pressure regulating valve or use the test device to gradually reduce the discharge pressure of the pump. When the pressure reaches the set pressure value, the pressure switch will be activated, pump 2 will start automatically, and the operation indicator light will light up; when the discharge pressure of the pump rises to the normal value, pump 1 will stop automatically, and send out an audible and visual alarm signal to stop the pump; e. When pump 2 starts automatically, check the discharge pressure of pump 1, which should be consistent with the pressure value set by the pressure switch; f. Start pump 2 and perform the automatic conversion test of pump 1 according to the above test method. 5.2.2 The power-off automatic conversion test of the cooling water pump group shall meet the following requirements: a.
Connect pumps 1 and 2 to the power supply, and the power indicator light will light up: b. After manually starting pump No. 1, the pump operation indicator light will light up, and the pump discharge pressure should be normal. Then, put pumps No. 1 and No. 2 in the "automatic" position;
Cut off the power supply of pump No. 1 to stop it, and send out an audible and visual alarm signal of power failure; pump No. 2 should start automatically, the pump operation indicator light will light up, and the pump discharge pressure should be normal;
d. Start pump No. 2, and perform the automatic conversion test of pump No. 1 according to the above test method. 5.3 Automatic start-stop test of cylinder jacket water preheating circulating water pump group shall be adjusted and tested in accordance with the provisions of the technical conditions of automatic control system for power station diesel engines. 5.4 Automatic cooling water temperature adjustment test
When the main and auxiliary diesel engines are running, use a thermometer to confirm that the automatically adjusted cooling water temperature should be within the set value range. 5.5 Cylinder or injector cooling water The high temperature alarm test simulates the temperature of the detection end rising to the set alarm temperature value, and the alarm device should send out an audible and visual alarm signal. 5.6 When the cylinder cooling water temperature is too high safety protection test simulates the temperature of the detection end rising to the set high temperature value, the main and auxiliary diesel engines should have the safety protection action of reducing the speed (or power) or emergency stop, and an audible and visual alarm signal should be issued. 5.7 When the piston cooling water outlet temperature is high safety protection test simulates the temperature of the detection end rising to the set high temperature value, the main engine should have the safety protection action of reducing the speed (or power), and an audible and visual alarm signal should be issued.
5.8 Cylinder or injector cooling water pressure (or flow) low alarm test adjusts the pressure regulating valve or uses the test device to simulate a decrease in the cooling water inlet pressure (or flow). When the pressure drops to the set alarm pressure (or flow rate), the alarm device shall send out an audible and visual alarm signal. 5.9 Safety protection test of low cylinder cooling water pressure (or flow rate) Adjust the pressure regulating valve or use the test device to simulate a drop in the cooling water inlet pressure (or flow rate). When it drops to the set low pressure (or flow rate value), the main engine shall have a safety protection action of reducing the speed (or power), and an audible and visual alarm signal shall be sent out. 5.10 Safety protection test of low piston cooling water inlet pressure Adjust the pressure regulating valve or use the test device to simulate a drop in the cooling water inlet pressure. When it drops to the set low pressure value, the main engine shall have a safety protection action of reducing the speed (or power), and an audible and visual alarm signal shall be sent out. 5.11 Safety protection test of low piston cooling water outlet flow Adjust the pressure The regulating valve or the test device can simulate the cooling water outlet flow rate to decrease. When it drops to the set low flow value, the main engine should have a safety protection action of reducing the speed (or power), and at the same time, it should send out an audible and visual alarm signal. 5.12 Automatic fresh water replenishment test of expansion tank 2
CB/T3777-1996
The automatic fresh water replenishment test of expansion tank should meet the following requirements: When the expansion tank replenishes fresh water, the function or action of the float valve, float switch or other liquid level switch should be normal and reliable; a.
b. Confirm that when the liquid level in the expansion tank rises to the set liquid level, the replenishment water valve can be automatically closed. 3 Expansion tank liquid level alarm test
When the expansion tank is at low level, the liquid level switch should be activated, and the liquid level alarm device should send out an audible and visual alarm signal. Additional remarks:
This standard is proposed by the National Technical Committee for Standardization of Marine Ships and is under the jurisdiction of Shanghai Ship Research and Design Institute. This standard was drafted by Shanghai Ship Research and Design Institute, with participation from China State Shipbuilding Corporation Comprehensive Technical and Economic Research Institute. The main drafters of this standard are Chen Shiyu, Wu Xiansheng and Shi Aizhong.
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