Bolted Storage Tanks - Operation & Maintenance

How frequently should bolted tanks be inspected and maintained?

It is recommended to perform inspections at least every 2 to 3 years. It is critical to maintain the integrity of your asset through proper inspection procedures.
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What types of testing is performed as part of pre-commissioning procedure?

The floors are tested using vacuum box testing method as per owner request. The shell joints are tested using hydrostatic test method. The roof joints are tested using the air and soap test method for gas tight or pressure roofs.
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What is your standard warranty on bolted tanks?

For epoxy-coated bolted tanks, we offer our standard warranty of one year. For glass-coated bolted tanks, we offer our standard warranty of five years for municipal applications and one year for industrial applications. Extended warranty is available upon request.
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What is the life expectancy of the mastic sealant used on Flat Panel tanks?

The tanks components (sheets, bolts, gaskets and sealants) are designed to last for the life of the tank (25 to 45 years), depending on the type of coating and tank application. To maximize the life of our tanks our engineers will work with you to understand all the details of your particular application to ensure that the proper sealant is chosen i.e. what product is being stored, what are the operating conditions etc.
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When using Chime tanks, are there any concerns with Joint Gasket Embrittlement and possible leaks?

Generally speaking, leakage caused by gasket embrittlement is rare. UV light will, over time, break down the gasket material. However, once installed, the “working” portion of the gasket is blocked from light exposure by the panels it is sealing.

This risk is further mitigated in western Canada as for most applications the tanks require insulation and cladding or are located in a building to prevent freezing.
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Would it be possible to re-locate the bolted tanks/silos?

Yes. This is one of the key benefits of using bolted steel storage tanks and silos.

This becomes a key factor for temporary sites where the project life is short but the owner will need similar storage on every project they are involved with.

Not only will bolted storage cost less to decommission, the same equipment can be reassembled anywhere else for re-use!
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How do you repair a leak if it occurs?

Leaks can happen in all tanks, and bolted tanks are not exempt. The good news is that fixing a leak on a bolted tank is typically much quicker and more cost effective compared to other tanks.

Typically, if a leak were to occur it would be discovered during hydrotesting, as the tank joints are “stretched” into position. Adding additional sealant and tightening the bolts is all that is required to permanently seal the tank. Once a leak free hydrotest is achieved the chances of a leak developing without some external influence is remote.

If a leak does develop over time it can usually be solved just as it would if it was discovered during hydrotest, by adding some additional sealant and/or tightening the bolts. There is no need for expensive welding and coating repair. In fact, if the tank were to be punctured by an external influence it can be repaired by simply placing a bolt and nut in the hole with some mastic sealant.

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