Dear Abdullah, Naval brass if in 'natural' seawater is prone to heavy corrosion and intense dezincification. However, due to lesser costs and some resistance to dezincification induced by tin content in Naval Brass, it is still being used by many while having a look on operating parameters. You may look into the operating conditions also, low velocity and stagnant water containing much of sulphur, carbondioxide and oxygen would tend to increase dezincification. If process / operations engineers cannot do anything good with the operating conditions, then frequent failures may trigger its replacement with one grade higher which may be Aluminium Bronze (UNS C61400). Hope this would help. Regards, Ashfaq Anwer http://thepetrostreet.com