English to Portuguese Tech/Engineering Materials (Plastics, Ceramics, etc.) Waste recycling

Numa carta de reclamação de um fabricante belga a um cliente português:

We informed you that our nominal production output in normal circumstances is about 16 bb/day.

(...)

Due to the fact that XXX did not provide us the promised number of workers (some days even no workers at all) to clean up the extreme circumstances at XXXX (crates without pallets, crates of different colour mixed, crates piled all over the plant, no or only very restricted availability of a forklift truck, etc.), XXX was only able to produce 153 bb within 21 production days. This is an average of 7,3 bb/day.