Regarding the repair of boiler refractory bricks prior to the commissioning of the trial operation

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Before heating up the 200 t/hour@75000 kPa D-type boiler (a U.S.-made product), an internal inspection was carried out, and it was found that some refractory bricks had fallen off. So, three companies specializing in refractory brick repair were brought in to conduct inspections and provide quotes. The results were as follows: 1. Manufacturer A said that the damaged areas on models 2200 and 2400 needed to be repaired, and some repairs were also necessary for models 2100 and 2300 ； 2. Manufacturer B said that only 2200 and 2400 need to be repaired; the other two do not require any repairs ； 3. Manufacturer C said that there is some peeling on the 2200 and 2400 models, but it’s not serious enough to warrant repair. Given the long-distance transportation and the fact that the equipment has been idle at the site for three years, some areas may continue to peel off even after it starts operating. Therefore, the manufacturer suggests not rushing to carry out repairs at the moment; we can wait until a year has passed and everything that needs to fall off has done so, before proceeding with the repairs. Therefore, I would like to ask the experts: is there any standard for repairing these refractory bricks once they arrive at the site? I remember someone saying before that the standards specify a certain diameter threshold above which repair is required, but I’ve forgotten which standard it was. Thank you so much!