filling to protect against ignition from static electricity generated as a result of liquid falling through air. Grounding shall be provided for lighting systems, pipe racks, pumps, vessel, filters, and all other equipment near and potentially within range of methanol vapor. Tall tanks and other equipment subject to lightning strike shall be equipped with lightning arresters. 

Metal containers (drums or tanks) and the associated fill equipment pump shall be bonded together and grounded during methanol transfer operations. Fill pipes or hoses shall be conductive and shall be bonded to the filling system. Bonding shall be done with a 1/8- inch bare stainless steel cable connected to a clamp with hardened steel points and screws or a strong spring that will penetrate paint, corrosion, and accumulated materials. The bonding clamp on the top chime of drum containers shall be applied prior to removing the bung. The pipe shall be extended to within one inch (25 mm) of the bottom of the container. Pouring shall start slowly (at less than one meter per second or a container fill rate of less than 5 cm of fluid level rise per minute) until the container is filled to a level equivalent to two pipe diameters up the side of the fill pipe. 

Methanol tanks shall be constructed of stainless steel class EN 1.4404 or mild steel provided moisture excluded from the system (eg. Padding tank vapor space with an inert gas) following EN 14015 “Specification for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above”. If carbon steel is selected as the tank material, a suitable electrically conductive coating material for internal coating shall be selected and approved by the Engineer. Epoxy resin coating shall not be accepted due to short coating life, complicating bonding and grounding. Galvanized steel shall not be accepted. Storage tanks shall be constructed with an internal floating roof. The tank internal pressure shall be controlled using pressure relief/vacuum breaker valves. Vents shall be configured with flame arresters. The flame arrester components shall not be fabricated of aluminum alloy. 

The total working capacity (net storage capacity) of storage tanks shall be enough for 15 days opera- tion of WWTP under the conditions given in Section 2.2, 2.3, 2.4 and 2.5. 

The volume of spill containment shall not be less than 110% of the working volume of the largest tank located in the containment. 

Mild steel or ductile iron can be used in piping. Piping connections shall be made with welded flanges and methanol compatible gaskets. 

## 3.3.4.14 Distribution Chamber for Secondary Clarifiers 

The distribution chamber shall be designed, constructed and equipped regarding the requirements set in Table 2-1. 

This distribution chamber shall receive the wastewater from the activated sludge tanks and distribute it evenly to the secondary clarifiers to be constructed. The structure shall be made of reinforced concrete. There shall be the penstocks or valves with electric actuator accordance with the specifications given in Section 7.8.8 and 7.8.18. The operation status of the penstocks should be monitored and controlled by the SCADA system. Chambers designed and constructed for the needs of Stage 2 should be isolated by an appropriate material/construction assuring the isolation until installation of penstocks proposed for Stage 2. 

