Valve fire test common problems

The petrochemical industry has a complicated production process and most of the raw materials, semi-finished products, finished products and various auxiliary materials used in the production process are flammable and explosive substances, which can easily lead to fire and explosion accidents. However, the valves used in some easy-to-fire conditions often have special design due to the potential danger of fire, so that the valve still has certain sealing performance and operation performance after being subjected to fire for a certain period of time. In the measure of the valve fire resistance, fire test is an important means to verify the valve. At home and abroad has been on the petrochemical industry with the valve fire test attaches great importance to and develop the relevant standards.
Test Standard
According to different use occasions and product features, valve refractory test standards vary, such as the American Petroleum Institute has developed for the soft valve seat 1/4 turn valve standard ANSI / API607-2005, for pipeline valves and wellhead device standard API6FA -1999, as well as the standard API6FD-1995 for check valve, the International Organization for Standardization has developed a standard ISO10497-2004 for all kinds of valve fire tests, and China has also developed a standard JB / T6899 for various valve fire test systems and methods -1993.
Valve fire test common problems
Variety
During the fire
Low pressure test
Operational test
other
Ball valve
Floating ball valve
Leakage within the soft seal seat, leakage may occur, the valve flange and stem leakage during the valve may be leaks, hard-seat valve seat leakage is generally small
Low pressure test after cooling may increase the phenomenon of internal leakage
After the operation of the external leakage easily exceeded, the leak location is generally the valve body flange connection and the valve stem
Fixed ball valve
Soft seal valve seat leakage, leakage may occur, the valve flange during the fire, the valve stem and the ball shaft may have a leak, the hard seal seat leakage is generally small
Low pressure test after cooling may result in increased internal leakage
After the operation of the leakage test leakage easily exceeded, the leak location is generally valve body flange, stem and ball support shaft
Fixed ball structure of the ball valve belongs to the upstream sealed type, the internal leakage during combustion should be deducted from the body of the valve cavity in the amount of water
Full welded ball valve
Internal leakage prone to external leakage at the valve stem may appear
Internal leakage may increase
External leakage is generally small, only the valve stem may appear outside the leakage
-
Flat gate valve
Internal leakage is smaller than other products, external leakage may occur at the valve body connection or valve stem
Internal leakage is generally small
After the operation is connected to the valve body, the valve stem and drain hole are prone to external leakage
-
Plug valve
Leak inside the soft seal valve is very large, can not be well guaranteed, less leakage within the hard seal valve
Low-pressure test after cooling soft seal valve leakage is generally larger, hard-sealed valve leakage is generally small
After the operation of the leakage test leak easily exceeded, the leak location is generally the valve body flange connection and the stem
-
Butterfly valve
Internal leakage is more prone to other products, external leakage may occur at the valve stem
Low pressure test after cooling leak easily appear
After the operation in the stem and support shaft prone to external leakage
-
Shut-off valve
Internal leakage is smaller than other products, external leakage may occur at the valve body connection or valve stem
Internal leakage is generally small
After the operation of the leakage test leak easily exceeded, the leak location is generally the valve body flange connection and the stem
-
Check valve
Internal leakage is more prone to other products, external leakage in the valve body and valve cover may occur
Low pressure test after cooling leak easily appear
After the operation of the leakage test easily exceed the amount of leakage test, the leak location is usually the valve body and bonnet junction
-
Valve fire test is a simulation of the valve in a fire environment test, which can truly and effectively reflect the test valve fire resistance, the study of the valve fire-resistant structure and assessment of valve fire resistance are of great significance.
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Variety		During the fire	Low pressure test	Operational test	other
Ball valve	Floating ball valve	Leakage within the soft seal seat, leakage may occur, the valve flange and stem leakage during the valve may be leaks, hard-seat valve seat leakage is generally small	Low pressure test after cooling may increase the phenomenon of internal leakage	After the operation of the external leakage easily exceeded, the leak location is generally the valve body flange connection and the valve stem
	Fixed ball valve	Soft seal valve seat leakage, leakage may occur, the valve flange during the fire, the valve stem and the ball shaft may have a leak, the hard seal seat leakage is generally small	Low pressure test after cooling may result in increased internal leakage	After the operation of the leakage test leakage easily exceeded, the leak location is generally valve body flange, stem and ball support shaft	Fixed ball structure of the ball valve belongs to the upstream sealed type, the internal leakage during combustion should be deducted from the body of the valve cavity in the amount of water
	Full welded ball valve	Internal leakage prone to external leakage at the valve stem may appear	Internal leakage may increase	External leakage is generally small, only the valve stem may appear outside the leakage	-
Flat gate valve		Internal leakage is smaller than other products, external leakage may occur at the valve body connection or valve stem	Internal leakage is generally small	After the operation is connected to the valve body, the valve stem and drain hole are prone to external leakage	-
Plug valve		Leak inside the soft seal valve is very large, can not be well guaranteed, less leakage within the hard seal valve	Low-pressure test after cooling soft seal valve leakage is generally larger, hard-sealed valve leakage is generally small	After the operation of the leakage test leak easily exceeded, the leak location is generally the valve body flange connection and the stem	-
Butterfly valve		Internal leakage is more prone to other products, external leakage may occur at the valve stem	Low pressure test after cooling leak easily appear	After the operation in the stem and support shaft prone to external leakage	-
Shut-off valve		Internal leakage is smaller than other products, external leakage may occur at the valve body connection or valve stem	Internal leakage is generally small	After the operation of the leakage test leak easily exceeded, the leak location is generally the valve body flange connection and the stem	-
Check valve		Internal leakage is more prone to other products, external leakage in the valve body and valve cover may occur	Low pressure test after cooling leak easily appear	After the operation of the leakage test easily exceed the amount of leakage test, the leak location is usually the valve body and bonnet junction	-