1.Design and select piping and support system based on contract specification and international standard. 2. Prepare technical document; operation and maintenance manual. 3. Cost estimation and procurement control 4. Design, vessel based on contract specification for water and wastewater treatment system, especially following international standard such as ASME, API, AWWA, AWS, etc.5. Review the AutoCAD drawings from AutoCAD operator.6. Prepare installation, operation and maintenance manual of process system. 7. Estimate cost of process and mechanical work of water and or wastewater treatment system based on the contract. 8. Plan and schedule the procurement and manufacturing of mechanical equipment.