I. Valve fire resistance test
According to different usage occasions and product functions, the valve fire resistance test standards are also different. For example, the American Petroleum Institute has formulated the standard ANSI/AP1607 for soft valve seats, the standard API6FA for pipeline valves and wellhead devices, and the standard API6FD for check valves. The International Organization for Standardization has formulated the standard IS010497 for the fire resistance test of various valves, and China has also formulated the standard JB/T6899 for the requirements of various valve fire resistance test systems and methods.
- General requirements
Although the test requirements for various valves are different, the general requirements of the valve fire resistance test standards are basically the same. In addition to the check valve, the general requirement is that the stem of the tested valve is installed horizontally on the test pipe, and the tested valve is closed. The pipe and the valve under test are filled with water and the water pressure in the system reaches the standard value, ignite the gas fuel and ensure that the tested valve is completely surrounded by fire. The flame temperature around the valve body and the temperature of various parts of the valve body should reach the standard within a certain period of time.
Please continue to burn for 30min under the condition that the temperature meets the requirements, and check the internal and external leakage of the valve during the fire and the internal and external leakage of the valve after the combustion and cooling.
- Experimental projects
The main leakage indicators and operation requirements of the valve fire resistance test include leakage during fire, leakage outside during fire, low-pressure test after cooling and operation test, etc.
- Test standards
API SPEC 6FA Specification for Fire Test for Valves
API SPEC 6FD Specification for Fire Test for Check Valves
API STD 607 Fire test for quarter-turn valves and valves equipped with nonmetallic seats
BS EN ISO 10497 Testing of valves - Fire type-testing requirements
GBT 26482 Check Valve Fire Resistance Test
II. Valve life test
Life test is a method to study the life characteristics of products. It is one of the most important items in the reliability test. It is to put the product
Examine the law of its failure change with time under specific experimental conditions. The valve life test is to test whether the sealing of the valve body and valve seat is good after a certain number of actions under the action of factors such as water flow pressure and mechanical circulation. It is mainly for the sealing performance test of the valve; the static pressure life test for the valve: the operating moment test for the valve.
- Test standards
The test standards of valve life test mainly include:
GB/T 26480 "Inspection and Test of Valves"
JB/T 8858 "Test Procedures for Static Pressure Life of Gate Valves"
JB/T 8859 "Stostatic Pressure Life Test Regulations for Shut-off Valve"
JB/T 8860 "Test Regulations for Static Pressure Life of Plug Valve"
JB/T 8861 "Ball Valve Static Pressure Life Test Regulations"
JB/T 8863 "Butterfly Valve Static Pressure Life Test Procedure"
Among them, the static pressure life test procedures of the five types of valves, gate valves, shut-off valves, plug valves, ball valves and butterfly valves define the static pressure life test as "under laboratory conditions, when the valve is subjected to medium pressure, the valve is subjected to the cycle operation test from full opening to full closing." And it is required that the sealing performance of the valve for the static pressure life test meets the requirements of GB/T 13927 or GB/T26480.
III. Low-temperature test of valve
Low-temperature valves usually refer to valves with an operating temperature below -40°C. With the development of air separation, liquefied natural gas, ethylene petrochemical and other industries, in recent years, the market demand for low-temperature valves has increased year by year, and the application field has become more and more extensive. Low-temperature valves have become an important branch of valve products, and the low-temperature test device of valves is an indispensable key equipment in the production process of low-temperature valves. A complete and requirement-compliant valve low-temperature test device is not only a guarantee for the production and quality control of low-temperature valves, but also an important part of low-temperature valve production capacity. Symbol.
Before the low-temperature test, the valve should be degreased and dried, because the grease and moisture return to hard solids in the low-temperature environment, causing structural damage in the valve. After connecting the valve and the test device, use helium to do the initial test under normal temperature and high working pressure to ensure the tightness of the connection of each part. In the process of cooling the valve, hydrogen should always circulate in the valve to take away the moisture that may be formed during the cooling process. The whole test process should be completed in the low-temperature test tank. The valve is immersed in liquid nitrogen as a whole, and the liquid level height should reach the neck of the valve cover. When the temperature of each part meets the specified requirements, the test can be started. The content of the low-temperature test is mainly to test the sealing and operation performance of the valve in the low-temperature state according to the relevant standard requirements, and several switching operations should be done during this period.
- Test standards
GB/T 24925-2019 "Technical Conditions for Low-temperature Valves"
BS6364 low-temperature valve
MESC SPE77:200 Low-temperature Valve Specification (Shell Petroleum Company Technical Specification)
IV. Valve micro-leakage test
The test medium uses compound gas, and the micro-leakage of the valve is measured with a helium mass spectrometer leak detector. Usually, a helium mass spectrometer leak detector is required in the valve low-temperature test and the sipative test.
- Test standards
ISO 15848-1 Industrial Valves-Measurement, test and qualification procedures for fugitive emissions Part: Classification system and qualification procedures for type testing of valves
ISO 15848-2 Industrial Valves-Measurement, test and qualification procedures for
Fugitive emissions Part2: Production acceptance test of valves
GB/T26481 Dispersion Test of Valve
V. Test of electric actuator
An electric actuator is a drive device that can provide linear or rotational motion, which uses some driving energy and works under the action of some control signal. There are two types of electric actuators, which are generally divided into partially rotating electric actuating mechanisms and multi-rotating electric actuating mechanisms. The former mainly controls valves that need to be partially rotated, such as ball valves, butterfly valves, etc., and the latter requires multi-turn rotating valves, such as gate valves, etc.
- Test standards
Technical conditions of G/T 24923 ordinary valve electric device
GBT 28270 Intelligent Valve Electric Device
JB/T8219 Ordinary and intelligent electric actuator for industrial process control system
NB/T20010.11 Pressurized Water Reap Nuclear Power Plant Valve Part 11: Electric Device
BS EN 15714-2 Industrial Valve. Actuator. Part 2: Electric actuator of industrial valves. Basic requirements
JBT 8862 Valve Electric Device Life Test Procedures
DLT 641 Power Station Valve Electric Actuator