【正文】 ign of hardware and software for central control center and for each pump station． Analyse advantages and disadvantages of each of these codes and their general applicability for use in the automatic control system． Determine necessary parameter and alarm which are to be monitored by central control center for the entire pipeline． Determine control and monitoring requirement of each pump station and corresponding control configuration and remend if conventional control equipment is necessary for back up and standby operation． Determine control flow diagram for pump station and provide control diagram and its mimic in the central control center． Determine method of providing mimic display， Or all alternate method of showing overall pipeline operation in the central control center .Select proper modes of operation of automatic control system through the microware system based On the requirements of the automatic control system． Determine scanning period， and the basis for the scanning period， if a scanning mode of operation is to be utilized by the automatic control system． Determine operational and alarm parameters to be supervised by automatic control system at each pump station． Determine regulating， monitoring and control 100ps necessary to provide this operation． Determine method of providing manual backup mode 0f operation during times of failure of automatic control system at each pump station． Determine method of monitoring station power source． UPS operation and voltage regulation at each pump station． Determine protective measures for total pipeline． And individual station in the event of power failure． The design CO． will determine type and configuration and operating mode for puter operating system for whole line． The design co. will provide the performance specification and the description of the puter program used． Make reliability analysis calculation for entire puter control system． Design whole puter system using optimum technology． Determine methods to be used， both hardware and software， to prevent damaging effects of surge upon pipeline． Design the dynamic operational software for entire pipeline system and frumpish program block diagram and functions of software to enable optimization of the pipeline system． Select programmable logic controller(PLC)， or other programmable control unit for implementing the pump station control function。 43 Communication Equipment The digit microwave equipment shall be provided for the munication transmission equipment of long distance oil transmission pipeline． The munication of the oil transmission pipeline is featured by the functions with the dispatching phone， phone between stations， meeting phone， administration phone， patrol and emergency munication， telegram，facsimile and data munication ． Determine munication channel utilization of microwave system， such as operation， data transmission rate and code error rate for automatic control system. The work will include remendation of number of mobile radio units． Determine munication hardware and software for interfacing automatic control system through the munication system． The software must be patible with one of the following： SDLC， BSC，etc． The design CO． will develop a concept for a VHF／ or UHF and a HF munication system． Design method of providing VHF(or UHF)mobile radio munication for use by patrol people along pipeline fight—ofway． Investigation of microware must include error coding， channel number, drop mode etc． based on data to be provided by owner． Comparison will be made and remendation furnished of VHF versus UHF for munication with patrol personnel． block valve control and where necessary local microwave system drops． Power Supply and Electric Design Contractor is to determine if Sufficient and reliable electric power is available at site． Contractor shall be aware of wide span voltage variation of the mercial gild． The main power supply shall be obtained by the contractor from the mercial gild． The power feeder shall run from the mercial gild to the power distribution board(PDB)． The battery system capacity shall be sized from min． 8 hours of backup power． The UPS system shall be sized according to load． UPS .Input power to the UPS shall be fed from the motor control center or PDB． Motor winding insulation shall be type required by IEC． Motor shall be furnished with space heater． The facility design shall maximize the use of metal clad(MC)cables。 7 1． During the electrical engineering the” consumer list／electrical power Balance Matrix” shall be drawn up． Assign motors and all other electrical load to the proper motor control center(MCC)and bus． Develop an accurate count of starter and breaker sizes for each MCC． Design the generator synchronization and regulation system along with the vendor． Confirm UPS 44 power requirement with instrument engineer and revise UPS size． Confirm the switchgear control power requirement and， calculate battery size． Size the power cables for facilities． Develop the design for welding and single． Phase power receptacles throughout facility． Review and approve all electrical vendor data． Inspect fabrication and witness testing of electrical equipments． Catholic Protection The catholic protection system shall provide external corrosion control for the buried piping and tanks． The catholic protection consists of an impressed current catholic protection system． A feeder from the motor control center Or D0we distribution in the control building provides power to the catholic protection transformer／ rectifier. The catholic protection shall be designed to maintain a rain． potential of 850 mV relative to a saturated co