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August 11 - August 15, 2014
What is the maximum number of holidays that should be permitted for linings in immersion service, and why?
Selected Answers
From
OM PRAKASH JAT of TECH INTERNATIONAL SHARJAH HAMRIAH UAE. on
April 24, 2015:
Not even a single holiday or pinhole can be allowed in an immersion coating because, surely, it will be a cause of severe coating failure.
From
Jimmie Meeks of McDaniels on
August 21, 2014:
While I appreciate the answers from each person, what part of immersion service was not understood. Holidays or pinholes are not acceptable on any coating job, immersed or not, that I am aware of.
From
Robert Ferguson of Greenmane -Pedersen,INC on
August 20, 2014:
Zero
From
Shane Gannon of Northern Metal Fab on
August 15, 2014:
Zero holidays are allowed for immersion linings. Sponge wiping the coated surfaces with a low voltage holiday tester works great for detecting holidays when the lining is 20 mils or less. High voltage testing can be used on linings thicker than 20 mils.
From
Daniel Liu of APC on
August 13, 2014:
No holiday can be permitted for immersion areas.
From
Navin Kothari of Kotech (QLD) Pty Ltd on
August 12, 2014:
Having no holidays means completely free from pinholes of any dimensions.
From
Simon Hope of Bilfinger Salamis on
August 12, 2014:
Immersion systems are designed to be pinhole- and holiday-free, hence, the need to undertake suitable holiday detection. Any such defect negates the whole purpose of the lining and the classic 'if you can't see it, it doesn't really matter' attitude is what leads to premature failure of so many systems. Proper quality control, rigorously upheld, can save a fortune in the long run.
From
Navin Kothari of Kotech (QLD) Pty Ltd on
August 11, 2014:
No holidays are permitted.
From
Steve Brunner of WPC Technologies on
August 5, 2014:
Linings for immersion service should be pinhole-free, meaning zero pinholes. This is a relative easy task when applicators follow coating manufacturers' instructions.
From
Billy Russell of D&R COATING INSPECTION on
August 2, 2014:
Zero holidays should be permitted for linings in immersion service.
From
Per Gabrielsson of Free Lance Consultations and Inspections on
July 31, 2014:
Not only holidays are detrimental. Also, overthicknesses are to be avoided, as they will lead to solvent traps and intercoat crackings.
Always specify minimum and maximum. dft's And do not always believe in what some of the paint manufacturers accept, that
2 x minimum on critical areas and 3 x minimum on non-critical areas would be safe.
From
Freeborn Enuvwaria of A coating inspector on
July 30, 2014:
Not even one holiday should be permitted, because it will cause a severe coating failure in the near future.
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Tagged categories:
Holidays;
Immersion service;
Linings;
Quality Control
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