Coating for Bolts
Coating for Bolts
(OP)
Hi All
As per the valve data sheet (sour service)the coating for bolts shall be "Zn +Fluoropolymer coating".But vendor offer is HDG+Xylan 1070. Plz clarify which one is better in quality.
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RE: Coating for Bolts
Dik
RE: Coating for Bolts
RE: Coating for Bolts
RE: Coating for Bolts
RE: Coating for Bolts
Dik
RE: Coating for Bolts
RE: Coating for Bolts
Dik
RE: Coating for Bolts
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coating for Bolts
Coming from a bolting manufacturers background - never heard of HDG before Xylan, to be honest, I do not believe PTFE will stick on HDG... Standard process is - degrease by acetone, media blasting, clean surface, zinc phosphate treatment, pre-bake, apply Xylan, bake, apply Xylan again, final bake and game over.
To clarify:
HDG+Xylan - does not exist
ZN+Xylan - is standard.
Xylan 1070 - just means default standard Blue Xylan coating.
HDG is totally different to ZN coating process.
If your vendor is offering you HDG+Xylan it is probably lost in translation and someone translated "zinc coating" as HDG.
RE: Coating for Bolts
Dik
RE: Coating for Bolts
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Coating for Bolts
Dik
RE: Coating for Bolts
HDG provides a more corrosion resistant coating, it is thicker and less porous.
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P.E. Metallurgy, Plymouth Tube
RE: Coating for Bolts
Maui
RE: Coating for Bolts
RE: Coating for Bolts
MJCronin
Sr. Process Engineer