250,000 Gallon Water Tank Blast And Paint Inside Only

mwsp

Has anyone on this board done or bid a job similar to this?

Attached Thumbnails

 

Blast&Coat

Yes, I have. What does the inside look like?

mwsp

Don't know, still full of water. Any suggestions? Also would like to talk to you about your market for mobile powder coating.

Blast&Coat

Clean up is not very fun in the enclosed space. We ended up renting an industrial vac which saved us countless hours of clean up. Definately paint with an anti-microbial paint if you can get your hands on any. This approach should go over very well with the customer and should garner you some more $$$ when you explain its benefits. If you had the powder coat system, we sprayed he snitfoul powder coat in the one we did and it wil last for decades. Nonetheless paint will do, then when it wears away you can do it again for more$
Any questions ask away.

mwsp

Blast & Coat would you be willing to talk by phone? Need advice.

painter213

You can not use just any coating system in a potable water tank. The coating that you use will have to hold a certification from NSF. If it does not have the NSF approval for use for potable water then it is against the law to be used for potable water. Also, if you have never done a water tank interior before, you are in for a new world. You will have to have ventilation and depending on the time of the year that it is done, you will have to have dehumidification as well to control the enviroment for blasting and coating work. Have you ever blasted per
SP-10 before? Also, what kind of abrasive will you use, and what grit size? What profile will the grit that you use give you? You will also have to holiday detect all of the welds after the mid-coat is applied as well. What kind of rigging will you use to reach the top surfaces? There will be stripe coats to be applied between each coat as well. You will have to ventilate the tank between each coat to allow the solvents to come fully out of the coating before you apply the next because if you do not, you will have blisters after the tank is filled with water again due to the solvents that will be trapped in the coating reacting with the water vapor that is moving through the coating to the tank surface. I have done a many water tanks all the way up to seven million gallons in size. They are a challenge and if not done right you will have a coating failure and you will be paying the customer to do it again.

__________________
Benny Abbott
Abbott Consulting and Coating Inspections
E-Mail: babbott@abbottcoatinginspections.com
Phone: (205-717-0292)

user20594

near white , on an insulated tank. 12/40 with a three mill prof. provided the tank is sound. this looks to me like an oil tank or edible tank. That tank is going to have unforseen problems

user20594

I read some more of your thread. I seen the insulation and thought it was a grease tank? why is it insulated. I would use a coating that is suitable for elevated temps. If you need to use a potable coating at elevated temps. I would like to know what you wpuld spec. The foam threw me off. If it is a normal tank I would use pota-pox or the industry equal.

user20594

went back and read the whole thread. if you have never coated a water tank before STOP. A water tank is far above you if you dont know what nsf or sspc10 stand for. The tank you are about to bid on has a step by step process that you must follow and be prepared to document and provide not only good workmanship but also provode employee health for. Your employees must be certified for enclosed space have monitors for co2 on the trucks and everyhting else that goes with it. I really think powder coating is impossible inside a 500,000 gallon tank, Mabey metalizing but powder coating .....no way. And it has to be legal. f

Blast&Coat

Panderson, I agree this job maybe be over his head but why do you think powder coating is not a good idea? We have sprayed the inside of 3 of them and are currently in talks with a guy who paints the inside of water towers. Thanks for your insight.

painter213

Xiom does not have a NSF approved powder for water tanks. If it does not carry the NSF Certification then it can't be used.

__________________
Benny Abbott
Abbott Consulting and Coating Inspections
E-Mail: babbott@abbottcoatinginspections.com
Phone: (205-717-0292)

Blast&Coat

We use mostly dupont powders, which is what we used on the tank.

user20594

I thought about this tank all day. Is it for a municiple water supply or for a plant. Why is it insulated if there are deep pits in the metal how can powder coating cover them. I have to back roll in order to get paint into the pits. The next question is the steel you are about to coat stable or worthy enough to put back into service. Industry will often push it. The munis' wont

painter213

Panderson, I would think that since it is a small tank that the insulation is there to prevent the water in the tank from freezing at the tank sides which will result in damage to the existing coating system. As for a larger water tank, the water freezing is not as bad due to the large volume of water contained in the tank. Just my guess as to why the tank is insulated. If there is deep pits in the tank then they will need to be welded up and then ground back down before surface prep is to be done. We usually have to weld up pits that are over half the thickness of the steel plate. Anything less then they are just coated over.

__________________
Benny Abbott
Abbott Consulting and Coating Inspections
E-Mail: babbott@abbottcoatinginspections.com
Phone: (205-717-0292)

user20594

I am not going to give up on the foam. I had a chance to spray that on a tank owned by agrium once. I want to know what the rest of the story is

user20594

I could have made three million on the tank in Ventura Ia for Agrium. I was unwilling to spend the 40,700. for the investment. I also had investors. I lost that because I was prudent

user20594

benny abott, KLM is a company I am not even close to but I think you would like the contact Rodney He does float downs. Rodney is also NACE certified. Coating Recources is my tnemec rep. Randy Bartz. In The middle of the game is Kevin Gretamin. Kevin Is a person I have not bought enough to know. I think he may be the ultimate rep. You got me? ASI spent two hundred thousand last year with coating recoues and I got a shirt.

Blast&Coat

Yes, If the pits are half the thickness or more we would weld them up as well. Anything else we have the ability to build up the coat/mils as much as needed to provide a even surface.

user20594

I want to understand how you can melt powder to flow into a surface that is not only huge but also has complex geometry.

Blast&Coat

A stream of powder is sprayed through a flame and cured instantly when melted on.Once cured we can apply another coat on top of it creating the surface thickness desired. Scafolding is set up and the entire tank is done. We have done three thus far. Dupont Tank Tan is the NSF approved powder we used.