产品介绍

HJ-20-2 Vapor Phase Inhibitor

HJ-20-2 Vapor Phase Inhibitor

Fixing Method

As for box-shaped steel structures such as hatch covers of ship, the fixing methods of VPI can be as follows:

•Replaceable fixed type:

As shown im Fig1 attached, drill a small hole in the top plate of hatch cover, fasten the vapor phase inhibitor sach with a round bar and put them inside the chamber of the structure, fix and weld the patch plate. If the vapor phase inhibitor need be replaced, first remove the patch plate by gouging renew the inhibitor and then weld the patch plate again. This a rather time-consuming method and is not used as usual. Nevertheless, it will be used as an easy remedy way in case some inhibitor is missed in the deposition.

•Replaceable type:

As shown in Fig2 and Fig3 attached, marine use standard drain plug can be used with a hanging piece fixed for fastening the inhibitor packaged in sack. The plub can be screwed in place with the inhibitor hanging inside the chamber of the steel structure. After a certain period of time, when it is found that the inhibitoe has volatilized, it is easy to screw out the plug for the replacement.

•Once-only fixed type:

As shown in Fig4 attached, if the inhibitor is disposed only once and need not repalce in future, Once-only fixed type VPI will be used (at present, it is used inmost cases.) Before the box-shape hatch cover being enclosed, fix an iron case for the inhibitor in the middle position beween the longitudinals and hransversals.(Make sure that the inhibitor packed in cloth sack is well fastened with the iron case, otherwise it will be dropped out when the hatch cover is rollings as aresult, the effect of even distribution will lose.)

•The fastening method for the inhibitor is as shown in Fig5 attached. The cloth sack for the vapor phase inhibitor should be made of cloth with good gas permeability and suitable strengh.

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