What is the minimum pipe size required for the drain of multiple units together, for 33 tons?

The minimum pipe size required for the drain of multiple units totaling 33 tons should indeed be sized appropriately to handle the condensate produced by the air conditioning systems efficiently.

When calculating the drainage requirements, the industry standard practices and local plumbing codes suggest that larger drain pipes are necessary to accommodate the flow of condensate and prevent clogging. For air conditioning applications, it is generally established that a 1-inch drain pipe is suitable for handling the condensate from multiple units, especially when the total cooling load becomes significant, as is the case with 33 tons of capacity.

A larger diameter pipe not only ensures proper drainage but also provides a buffer against potential blockages. This is particularly important when multiple units are discharging condensate into a common drain, as the accumulation of water can lead to similar issues.

The correct choice aligns with recognized guidelines that advise on sizing drainage pipes according to the cooling capacity, particularly in commercial applications where multiple units operate simultaneously. In contrast, smaller pipe sizes would be insufficient and could lead to poor drainage performance over time.