Re: [MW:24267] Re: How to protect Serration of Flanges during Hot dip galvanization

Dear Hamid,
Galvanised flanges mostly used in utility services  not in hydrocarbon service where leak and leakage is  catastrophic.  If galvanising is applicable in to your project flanges than specific requirements of flange seration roughnes will not be there in specs and piping class. Please read the applicable piping class material requirements. Gaskets types will compensate on the galvanised face.

If required before galv.additional temporary  arrangements can be prepared with thin metal sheets but that also will not give full assurance.

But please reverify against your requirements and address this to your client or customer.

If already this product is mistakenly galvanised than machining will be only solution on loose flanges. .and very difficult on spools.
Regards

On 11 Feb 2016 08:00, "Hamid Jabbari" <lifebod@gmail.com> wrote:

Does any one know how could i remove the hot galvanized coating from face of flange?
plz advise

On Monday, August 23, 2010 at 1:08:56 PM UTC+4:30, aly mhaskar wrote:

Dear All, Presently we are doing hot dip galvanization of pipe spools where we have to protect the serration of flanges during galvanization.   Can any body suggest what can be applied on serration to protect it from adhesion of ZINC on serration.   Thank you in advance.   Mhaskar Aly Kuwait

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