FLAT FACE FLANGE PAINTING

[Suresh Babu]

Dear Experts,

We have some flat face flanges in Pressure vessel. The pressure vessel manufacturer done the painting on the flat face up to the bolt hole and left the remaining face unpainted. I hope the entire flat face will leave as unpainted. I am trying to get info from client which type of Gasket they will use at site.

Please put your suggestions.

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Best Regards,

Suresh Babu,

suresh...@gmail.com

[Ammar Shaikh]

Flange mating surfaces are not painted at all.

The are small grooved lines present on mating surfaces to provide necessary roughness for ensuring that gasket is in place.

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[G Sreenivas Rao]

Dear sir
In pressure vessel flat flange shall not be painted, this is for
gasket seating and if painted the are will not be giving seal
tightness. please ensure if the area is giving seal tightness then can
be left as it is.

Regards
G.Sreenivas Rao

[Lalu r p]

Dear sir
Normally for flange faces we do not paint the surface to ensure the
proper sealing.and it is normally machined for the gasket tightness.

[Praphulla Phirke]

What is the test pressure ?

Better to remove the paint completely and You can use either neoprene or PTFE gaskets.

Praphulla
Sent from my iPhone

[Gerlof Oegema]

Hi,

It is always good practice to slightly paint the clamped area of flange face only with a red oxide paint to maximum DFT of 40 microns (with gramophone finish still visible) as to prevent corrosion of this clamped area while waiting to be installed.

Regards,
G. Oegema

 
DISCLAIMER

[Suresh Babu]

Dear Mates,

Thanks to all for your valuable feedback.

As per my request client provided the piping class document and the subject nozzles with flat face flange will be used with FF Gaskets. So the entire flat face need unpainted and shall be protected with rust prevention compound like MOLYKOTE. So we removed all the paint from the flat face with paint remover and thinner and applied rust prevention compound.

Thanks again.

[Chetan Karbhari]

Hi'

As manufacturer has painted bolting area on flat face. 

1) check as per drg what gasket to use

2)Is there any serration on flg face.

3)they paint after sand blasting or just by hand brush

Generally no manufacturer paint if full face gasket req

 

Chetan Karbhari 

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From: Gerlof Oegema <Gerlof...@aurecongroup.com>
To: "material...@googlegroups.com" <material...@googlegroups.com>
Sent: Thursday, 28 February 2013 4:13 PM
Subject: RE: [MW:16902] FLAT FACE FLANGE PAINTING

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