All tanks baffles shall be provided with one nipple for drain in the bottom and one nipple for ventilation with top, the material of the nipples shall be from excellent resistant material for phosphoric acid.• Over flow drain pipe shall be provided to five storage tanks (T6611A/B/C & T6612 A/B)• The materials for phosphoric acid piping and all other piping networks to be discuss during the site visit.• The capacity of all pumps shall part of the contractor designer scope to meet all process requirements• Use plug valve instead of diaphragm valves suitable to resist phosphoric acid where is required.• Contractor shall provide one spare drain nozzle with blind for all new tanks, maturation and settler for future requirements.• Contractor shall install alarms of High & High High & Low & Low Low signal alarms to be transferred to existing PLC in existing phosphoric acid plant control room and new local control room at farm. For all new tanks, maturation and settler.