Calibrating load cells of 30,000KG tanks

Hello all! We have huge tanks (reservoirs) with a 66,000lb (30,000KG) capacity. Can anyone in the oil, beer, or other liquid industry recommend a supplier who calibrates load cells? We are in Canada. Thanks!

Im not in canada.   They are usually done by a scale company.  Think of those that are capable of calibrating and repairing truck and rail scales.    Or call the MFG or installer for advise.    

I use (as do many many others)  McLean Scale  (if your in Ontario)    I would give them a shout, they have a good reputation for a reason