Figure 1-1. Pressure-vacuum breather valve.
Figure 1-2. Flame arrester and tube bank.
PART D - TANK CLEANING
Determining the Need.
Visual inspection. The inspection of the interior of the tank from the manway opening or by any other
suitable means without actual physical entry into the tank.
Physical entry inspection. The inspection of the interior of a tank by physical entry. This requires special
preparations according to existing safety regulations.
Change of product service.
Any type of major repairs or maintenance.
Scheduled cleaning in accordance with MIL-HDBK 200.