ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
(OP)
Dear Gents,
As per our tank foundation drawings we are supposed to install an asphalt impregnated board at the bottom of tank bottom plate.Since this asphalt board is in touch with the tank bottom plate Is there any chance to catch fire on it while doing the POST WELD HEAT TREATMENT of the weld joints of tank? Moreover this while doing welding of the plates is there any chance to get fire because of the spatters of welding? If it catches fire is there any other alternative for this? Is there any other practices to avoid catching of fire during construction of tank. Kindly advice. Thanks in advance
Rency isac
As per our tank foundation drawings we are supposed to install an asphalt impregnated board at the bottom of tank bottom plate.Since this asphalt board is in touch with the tank bottom plate Is there any chance to catch fire on it while doing the POST WELD HEAT TREATMENT of the weld joints of tank? Moreover this while doing welding of the plates is there any chance to get fire because of the spatters of welding? If it catches fire is there any other alternative for this? Is there any other practices to avoid catching of fire during construction of tank. Kindly advice. Thanks in advance
Rency isac





RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
Why do the thin floor plates in an API-650 tank require post-weld heat treatment ?
Please do not answer "that is what the client requires in his specification".....
What is the specific tank floor material, thickness, and weld type for your particular tank ?
Who is supplying this board ? Have you contacted them ??
Is this the first tank for you, where asphalt impregnated board is used ?
MJCronin
Sr. Process Engineer
Venture Engineering & Construction
www.VentureEngr.com
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
PWHT of the complete tank is often specified for caustic storage. Whether or not it actually prevents stress corrosion cracking in the floor seams may be subject to debate.
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
The board in question is usually a cane-fiber asphalt-impregnated expansion joint material. It is intended for use in concrete, not under tanks, and it is unlikely the manufacturers would have data on high-temperature applications of it. Maybe a maximum temperature, which is likely less than 1200 degrees.
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
The board in question is usually a cane-fiber asphalt-impregnated expansion joint material. It is intended for use in concrete, not under tanks, and it is unlikely the manufacturers would have data on high-temperature applications of it. Maybe a maximum temperature, which is likely less than 1200 degrees.
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
We are supposed to do the PWHT where the flush type clean out man hole is coming. This is as per API 650. For details of the location of asphalt impregnated board please find the attached drawing. Datasheet of the asphalt impregnated board is also attached along with this thread for your reference. Kindly help me to resolve this problem.
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
RE: ASPHALT IMPREGNATED BOARD BELOW TANK PLATE AS PER API 650
assembly prior to installation in the tank shell or after installation into the tank shell if the entire tank is stress-relieved. This is a pretty big tank to PWHT the enter tank. However, if you are PWHT the entire tank in the field then you have a combustible issue and the best idea I have seen is to lift the tank after PWHT to install the fiberboard. You may also have an issue with heating the foundation and especially the HDPE Liner, the telltale pipe, the polysulfide sealant, etc.