8　Desulfurization and Denitrification

8.1　General Provisions

8.1.1　This chapter is applicable to the construction and acceptance for the wet limestone-gypsum flue gas desulfurization equipment，the selective catalytic reduction（SCR）flue gas denitrification equipment and their auxiliary systems.

8.1.2　The acceptance and inspection shall be carried out before the equipment and materials enter the plant.And the equipment unpacking counting or acceptance recording shall be carried out.

8.1.3　For any equipment with the moistureproof and other special requirements，the moistureproof measures shall be immediately recovered or it shall be placed indoor after the equipment is unpacked.

8.1.4　The inspection and erection of the mechanical equipment shall meet the related requirements of Chapter 10 and Chapter 11 in this Part.The erection of pumps shall meet the related requirements of DL 5190.3 Technical Specification for Thermal Power Erection and Construction-Part 3：Steam Turbine Set.

8.1.5　When installing the equipment and pipes whose corrosion protection has been done，the measures shall be taken to prevent the corrosion resistant coatings from damage.

8.1.6　During the period from corrosion protection construction of the absorption tower to the erection of the internal equipment，the absorption tower shall be taken as the key fire protection area.The complete fire application ticket system and the pre-arranged planning of fire protection and fire extinction shall be provided.Moreover，the good ventilation measures shall be taken during operation in the tower.

8.1.7　For the containers and pipes which need concealing or corrosion resistant painting，their concealing or painting shall be carried out after passing the pressure testing or water filling test.The pressure test shall be carried out to the pipes or chambers attached with the equipment before erection.If the manufacturer has no specific requirement，the test pressure shall be 1.25 times the design pressure.

8.1.8　For the equipment，metal structures and pipes which need corrosion resistant painting，all welding and cutting as well as cleaning and grinding on the substrate shall be done before corrosion resistant painting.

8.1.9　After the erection of the pipes and equipment has been carried out，the internal cleanness inspection shall be carried out to those locations where the personnel cannot arrived before erection.