I don't mind to share ours, although it is on a very large scale (centralized lending process across 7 states)
-We have an approved appraisers list, in other words, underwriting will not order or consider an appraisal unless it is from one of our "approved appraisers"
-An appraisal can be used as long as it is within 12 months from the appraisal and is from one of our approved appraisers, even if the appraisal was not done for XYZ bank.
-The loan processor simply orders (by calling or emailing) the appraisal and lets the appraiser know the specifics of the job, the appraiser will then accept the order or reject the order.
-Once the appraisal is in the u/w will review it and proceed accordingly.
This is quite simple but does this help?
I hope so!