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Tank roof repair using BELZONA 1
- Thread starter jrafael95
- Start date
- Thread starter
- #3
- Thread starter
- #5
@IRFs,
I am studying an issue for my client,
The issue:
My client owns hundreds (literally) of API 650 vertical storage tanks at various fuel terminals nation-wide (not USA!).
I need to make several step-by-step procedures (according to API) to standarize the maintenance of these tanks. They want one for cold repair using belzona in their roofs (as premise, they are all fixed conical-roof).
But I didn't find any API standard that allows this nature of repair, but I know that a lot of companies do this type of service.
The best refference I found is this attached file:
I am studying an issue for my client,
The issue:
My client owns hundreds (literally) of API 650 vertical storage tanks at various fuel terminals nation-wide (not USA!).
I need to make several step-by-step procedures (according to API) to standarize the maintenance of these tanks. They want one for cold repair using belzona in their roofs (as premise, they are all fixed conical-roof).
But I didn't find any API standard that allows this nature of repair, but I know that a lot of companies do this type of service.
The best refference I found is this attached file:
-
1
- #6
HTURKAK
Structural
- Jul 22, 2017
- 3,362
Dear jrafael95 (Mechanical
API 650,620,2000.. are Construction Standards.
API 653,510,570 ..Inspection standards.
You shall look to Recommended Practices (RP). Regarding the roof repair,
API RECOMMENDED PRACTICE 575 10.3 Special Repair Methods states:
'Leaks in roofs can be repaired by soft patches that do not involve cutting, welding, riveting, or bolting of the steel. Soft patches can be made from a variety of materials, including rubber, neoprene, glass cloth, asphalt, and mastic or epoxy sealing materials; the choice depends on the contents of the tank and the service conditions. The patching is applied in much the same manner as similar patching would be applied to the roof of a building. The patches may be applied when the tank is in service, if proper safety practices are followed. Figure 67 and Figure 68 show a patch and a complete coating, respectively.'
NEW ENGLAND MAXIM Quote 'Use it up, wear it out; Make it do, or do without. '
Good Luck
Good Luck..
API 650,620,2000.. are Construction Standards.
API 653,510,570 ..Inspection standards.
You shall look to Recommended Practices (RP). Regarding the roof repair,
API RECOMMENDED PRACTICE 575 10.3 Special Repair Methods states:
'Leaks in roofs can be repaired by soft patches that do not involve cutting, welding, riveting, or bolting of the steel. Soft patches can be made from a variety of materials, including rubber, neoprene, glass cloth, asphalt, and mastic or epoxy sealing materials; the choice depends on the contents of the tank and the service conditions. The patching is applied in much the same manner as similar patching would be applied to the roof of a building. The patches may be applied when the tank is in service, if proper safety practices are followed. Figure 67 and Figure 68 show a patch and a complete coating, respectively.'
NEW ENGLAND MAXIM Quote 'Use it up, wear it out; Make it do, or do without. '
Good Luck
Good Luck..
Will you limit the hole size you going to allow to be patched?
At what point to you say patching is not OK?
Will you patch in service?
How will you know that the rest of the roof is safe to walk on, and for how long?
Do you need to restrict the tank's use after making a soft patch, for instance:
can it be walked on for normal operations ( gauging, inspection, etc )
will it be good for all normal loads ( wind, snow, etc )
will it be good for all operational loads ( pressure and vacuum )
will it be good for emergency conditions such as fire in a nearby tank
what time frame will it be good for
how will future inspections be done
At what point to you say patching is not OK?
Will you patch in service?
How will you know that the rest of the roof is safe to walk on, and for how long?
Do you need to restrict the tank's use after making a soft patch, for instance:
can it be walked on for normal operations ( gauging, inspection, etc )
will it be good for all normal loads ( wind, snow, etc )
will it be good for all operational loads ( pressure and vacuum )
will it be good for emergency conditions such as fire in a nearby tank
what time frame will it be good for
how will future inspections be done
- Thread starter
- #8
@HTURKAK:
Thanks for the answer! I will get this API RP right now
@IFRs:
Thanks for the answer too
Will you limit the hole size you going to allow to be patched?
My client didn't say anything about this,so , at this first moment, I'll recommend this type of repair for holes that do not affect the strenght of the roof.
At what point to you say patching is not OK?
Honestly, I need to study more about this type of repair before giving a technical opinion
Will you patch in service?
Yes.
Do you need to restrict the tank's use after making a soft patch, for instance
No.
My client has it's own inspection program and I don't have any info about how they would inspect a tank with it's roof repaired with belzona.
Thanks for the answer! I will get this API RP right now
@IFRs:
Thanks for the answer too
Will you limit the hole size you going to allow to be patched?
My client didn't say anything about this,so , at this first moment, I'll recommend this type of repair for holes that do not affect the strenght of the roof.
At what point to you say patching is not OK?
Honestly, I need to study more about this type of repair before giving a technical opinion
Will you patch in service?
Yes.
Do you need to restrict the tank's use after making a soft patch, for instance
No.
My client has it's own inspection program and I don't have any info about how they would inspect a tank with it's roof repaired with belzona.
Dhurjati Sen
Materials
Well your client is going for a very unsafe and unscientific practice.
Unsafe as the personnel applying belzona (or other people who would later visit the tank roof) are at risk as the perforated roof plates need to be replaced.
Unscientific as the hydro-carbon vapours could eat away the belzona in days or months which is not properly known.
These are nothing but cost cutting measures in uncertain times. Try to stay away from such non-sense.
DHURJATI SEN
Kolkata, India
Unsafe as the personnel applying belzona (or other people who would later visit the tank roof) are at risk as the perforated roof plates need to be replaced.
Unscientific as the hydro-carbon vapours could eat away the belzona in days or months which is not properly known.
These are nothing but cost cutting measures in uncertain times. Try to stay away from such non-sense.
DHURJATI SEN
Kolkata, India
- Thread starter
- #10
Dhurjati Sen
Materials
Google the following:
Durapol UHT
They are experts and you may contact them.
Application of Belzona 1391 was tried in a plant in the middle east, but it did not last for long.
Standard Disclaimer: I am in no way connected to M/s Sealtec and strongly believe that complete or partial replacement of the perforated roof is the most appropriate solution.
DHURJATI SEN
Kolkata, India
Durapol UHT
They are experts and you may contact them.
Application of Belzona 1391 was tried in a plant in the middle east, but it did not last for long.
Standard Disclaimer: I am in no way connected to M/s Sealtec and strongly believe that complete or partial replacement of the perforated roof is the most appropriate solution.
DHURJATI SEN
Kolkata, India
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