A leak location and status of the DN150 body on both sides of connection flange bolts to leak, due to the gap very small flange
connection, eliminate leakage through the gap into the sealant. Leakage of the medium is steam leak system temperature of 400 to 500 ℃,
system pressure 4MPA.
Sealed construction site investigation of the leak site, for the realization of limited block fixture method inclusive leakage points to
form a sealed chamber, into the sealant, thereby eliminating the leak.
1, the fixture design
(1) fixture structure to determine
(1) inclusive leak point, the establishment of the body flange and pipe flange connection between the short section of flange seal
chamber. In order to prevent pressure - potential leaks of the body and the flange gap appeared and then leak, located in the fixture
and the valve body flange outer edge of the anastomotic ring cavity plastic injection.
â'¡ Reducing flange agent injection process, the fixture is easy to trail flange side shifted, so the tooth contact clamping limit
measures.
(2) fixture map and size of construction fixture structure shown in Figure 1.
2, the sealant selection and dosage estimates
(1) sealant selection according to the leakage of the system temperature and leak site characteristics, TXY-18 # A-type sealant. The
sealant temperature, excellent resistance to medium and the injection process performance, easy to establish a uniform and dense seal
structure and sealing to maintain long-term stability.
(2) The amount of estimate unilateral leakage points required sealant 4.5KG.
3, the construction operation
(1) fixture installation, due to tooth contact, the tooth tip diameter smaller installation requires weeks circle percussion fixture
outer wall of occurrence of tooth tip deformation, clamping limit.
(2) Injecting operation is complete, the fixture and the valve body and the flange ring cavity into the sealed chamber, intermediate
chamber injection of agents, agent injection process should be balanced to put pressure, and attention to recharge pressed to prevent
stress relaxation.
(3) sealant curing, after the effect of observation, local recharge pressed, to prevent stress relaxation, and then closed the hole
injection agent.
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