Client Project Title Location Project No. Document No. : : : : : Inner Mongolia China Coal Mengda New Energy Chemical Co., Ltd. 500 KTA Engineering Plastic Project PP Plant Ordos City, Inner Mongolia Autonomous Region 1115120 1115120-00-IA343-1 Rev.: 0 14 of 22 PIC-5236-4 uses/indicates a 6 minute rolling average of the Vent Recovery Surge Tank pressure. PIC-5236-4 inputs the rolling average to logic 52-1-4 when the output of PIC-5236-4 to PV-5214-3B is less than or equal to the low setting, the logic will load the compressor. Likewise, when the output of PIC-5236-4 to PV-5214-3B is greater than or equal to the high setting, the logic will unload the compressor. The high and low settings are to be operator adjustable and are typically 30% and 0%.
PIC-5236-4使用/指示排放气回收缓冲罐6分钟的平均波动压力。当PIC-5236-4去PV-5214-3B的输出低于或等于低设定值时， PIC-5236-4将平均波动输入到逻辑52-1-4。同样地，当PIC-5236-4去PV-5214-3B 的输出高于或等于高设定值时，逻辑将卸载压缩机。高和低设定值是由操作员调整的并且典型的数值为30% 和 0%。
13.0
VENT RECOVERY COMPRESSOR K-5214 SUCTION PRESSURE
CONTROLLER (CONTROL LOOP DIAGRAM SHEET 16)排放气回收压缩机 K-5214 入口压力控制器 (控制回路图 16)
The first stage suction pressure is controlled by using two control room mounted pressure controllers (PIC-5214-2A and PIC-5214-2B) and two pressure valves (PV- 5214-2A and PV-5214-2B).
第一级的入口压力通过使用两个控制室安装的压力控制器(PIC-5214-2A 和 PIC-5214-2B)和两个压力阀(PV-5214-2A 和 PV-5214-2B)来控制。
PIC-5214-2A/PV-5214-2A throttles the vent recovery surge tank, C-5236, pressure swings and limits the maximum pressure on the downstream side to prevent the compressor suction pressure from going high. This controller/valve combination maintains a constant suction pressure to the compressor. PIC-5214-2A is to be tuned “fast.”
PIC-5214-2A/PV-5214-2A阻止排放气回收缓冲罐，C-5236的压力波动和限制下游侧的最大压力来防止压缩机入口压力变高。这个控制器/阀联合起来维持压缩机入口压力的恒定。PIC-5214-2A 应调为 “fast.”
PIC-5214-2B/PV-5214-2B controls the pop-back flow from vent recovery compressor 3rd stage discharge back to 1st stage suction in order to prevent the suction pressure from going low-low. The set-point for PIC-5214-2B is to be set lower than PIC-5214-2A in order to minimize the amount of pop-back. PIC-5214-2B is to be tuned \5214-2B share the same pressure transmitter.
PIC-5214-2B/PV-5214-2B控制排放气压缩机第三段出口去第一段入口的返回量，这是为了防止入口压力变为低-低。PIC-5214-2B的设定值设定低于PIC-5214-2A是为了最小化返回的量。PIC-5214-2B被调为\。PIC-5214-2A 和 PIC-5214-2B 共同使用一个压力变送器。
Client Project Title Location Project No. Document No.
: : : : : Inner Mongolia China Coal Mengda New Energy Chemical Co., Ltd. 500 KTA Engineering Plastic Project PP Plant Ordos City, Inner Mongolia Autonomous Region 1115120 1115120-00-IA343-1 Rev.: 0 15 of 22 14.0
RECYCLE LIGHTS HEADER PRESSURE CONTROLLER (CONTROL LOOP DIAGRAM SHEET 17)循环轻组分总管压力控制器（控制回路图表，表17）
Controllers PIC-5229-4 and PIC-5229-7 provide back up nitrogen to the conveying assist gas and lights sweep system when the pressure in the Lights Recycle Surge Tank, C-5229, drops below preset levels.
当轻组分循环罐C-5229 压力低于预设值时，控制器PIC-5229-4和PIC-5229-7提供补充氮气去输送援助气和轻组分吹扫系统。
Controller PIC-5229-4 is a control room mounted pressure controller which controls the pressure of the gas entering the downstream headers by allowing purified nitrogen to supplement or back up the lights recycle flow. PV-5229-4 is normally closed and opens when the downstream pressure drops. PV-5229-4 is interlocked to close on low differential pressure. See Logic 52-3. PIC-5229-4 uses the same pressure transmitter as PIC-5229-7.
控制器PIC-5229-4是一个安装在控制室的压力控制器，它通过让精制氮气供给或补充轻组分循环流量来控制着进入下游总管的压力。PV-5229-4正常时是关闭的，当下游压力降低时打开。在低差压时PV-5229-4是联锁关闭的。看逻辑52-3。PIC-5229-4与PIC-5229-7使用相同的压力传送器。
PIC-5229-7 is the primary downstream pressure controller. PIC-5229-4 is the secondary downstream pressure controller (PV-5229-4 normally closed). Switch HS-5229-4 is a two position control room mounted handswitch with “AUTO”/”CLOSE” both maintained. The handswitch is provided to close KV-5229-4A and PV-5229-4 and opens KV-5229-4B. When PV-5229-4 is given the open signal, pressure controller PIC-5229-4 takes over and controls the movement of the valve. This requirement is initiated by the “AUTO” position of the switch. When the “CLOSE” position is selected, valves KV-5229-4A and PV-5229-4 close and KV-5229-4B opens.
PIC-5229-7是主要下游压力控制器。PIC-5229-4是次要的下游压力控制器（通常PIC-5229-4 是关闭的）。开关PIC-5229-4 是一个安装在控制室的带有AUTO”/”CLOSE（维持的）的两位手动开关。此手动开关关闭KV-5229-4A 和 PV-5229-4 并且打开 KV-5229-4B。当PV-5229-4给出打开信号时，压力控制器KV-5229-4B接收信号并控制此阀的动作。此开关的AUTO位置启动此必要条件。当选择CLOSE位置时，阀KV-5229-4A 和PV-5229-4关闭并且 KV-5229-4B打开。
15.0
REFRIGERATION INTERCHANGER E-5231 TEMPERATURE CONTROLLER (CONTROL LOOP DIAGRAM SHEET 18)制冷中间换热器 E-5231 温度控制器 (控制回路图表，表18)
TIC-5204-2 is a control room mounted temperature controller, equipped with a low and high temperature alarm, to control the temperature of the interchanger cold-end outlet. TV-5204-2 is used to throttle recovered liquid to the interchanger E-5231 by receiving a signal from low-select TY-5204-2. TY-5204-2 compares output signals from TIC-5204-2 and TIC-5231-4. The low signal is chosen to control TV-5204-2. TIC-5204-2 will control TV-5204-2 during normal operation. Valve TV-5204-2 is interlocked to close when compressor (K-5214) is not running. See Logic 52-1 for details.
TIC-5204-2是一个安装在控制室的温度控制器，配有低温和高温报警，来控制中间换热器冷端出口的温度。通过从低选TY-5204-2来的信号，TV-5204-2阻止回收的液体去中间换热器E-5231 。 TY-5204-2比较TIC-5204-2 和 TIC-5231-4的信号，选择低信号来控制TV-5204-2。正常操作期间TIC-5204-2控制TV-5204-2。当压缩机(K-5214)不运行时，阀TV-5204-2联锁关闭。详细请看逻辑52-1。
16.0
RECOVERY COLUMN C-5260 LEVEL CONTROLLER (CONTROL LOOP DIAGRAM SHEET 19)回收塔 C-5260 液位控制器 （控制回路图表，表19）
Controller LIC-5260-1 controls the column level by sending the signal to a comparison element (LY-5260-1). This signal is compared to the signal from LIC-5260-6 (column liquid leg) and the lesser of the two signals controls LV-5260-1.
控制器LIC-5260-1通过送信号去一个比较元件(LY-5260-1)来控制着塔的液位。这个信号与LIC-5260-6来的信号比较，两个信号之中较小的控制LV-5260-1。
Client Project Title Location Project No. Document No. : : : : : Inner Mongolia China Coal Mengda New Energy Chemical Co., Ltd. 500 KTA Engineering Plastic Project PP Plant Ordos City, Inner Mongolia Autonomous Region 1115120 1115120-00-IA343-1 Rev.: 0 16 of 22 17.0
MIXER HOPPER Y-6211 ADDITIVE DOSING CONTROLLERS (CONTROL LOOP DIAGRAM SHEET 20)混合器料斗 Y-6211 添加剂定量给料控制器 （控制回路图表，表20）
FFICA-6241-1….FFICA-6247-1 indicate and control mass flow rate through Mastermix Feeders, S-6241…..S-6247. The mass flow rate is ratio controlled to the Product Purge Bin Rotary Feeder, S-5015.
FFICA-6241-1?.FFICA-6247-1显示并控制质量流量直到主混合器进料器S-6241?..S-6247。此质量流量由产品净化仓旋转进料器S-5015比值控制。
FFIC-6214-3 indicates and controls liquid additive feed rate to mixer, Y-7001. Indication and alarms located in control room. Flow rate signal to go to process computer. The ratio controller is to have two modes: “Auto” and “Cascade”. When in “Auto” mode, the controller functions as a flow controller for liquid additive. When in “Cascade” mode, it controls the liquid additive flow rate as a ratio to the speed of the Rader feeder. The change from “Auto” to “Cascade” mode should be seamless, with the “Auto” mode setpoint automatically converting to the “Cascade” mode ratio setpoint that gives the same flow rate.
FFIC-6214-3显示并控制液体添加剂进料速率去混合器Y-7001。显示和报警位于控制室内。流量信号去工艺计算机。此比值控制器有两个模式：AUTO和CASCADE。当处于AUTO模式时，控制器的作用是作为液体添加剂的流量控制器。当处于CASCADE模式时，它作为一个与旋转下料器的速度的比来控制液添加剂流量。从AUTO到CASCADE模式的切换不应有波动，即AUTO模式设定点自动的切换到CASCADE模式的相同流量的比值设定点。
SICA-5015-2 is a Control Room Rotary Feeder speed indicator-controller, with alarm. Speed of Rotary Feeder to be manually inputted by operator.
SICA-5015-2是一个控制室旋转下料器速度显示器-控制器，带有报警。
The control loop is comprised of the following elements:旋转下料器的速度由操作员手动输入。
- SC-5015-2 Control Room controller, which provides a signal to Vendor’s hydraulic flow valve.
- SIA- 5015-2 Control Room indication of feeder speed and alarm.
- SC-5015-2，控制室控制器，提供信号到供货商的液压流量阀。 - SIA-5015-2，控制室显示下料器速度和报警。
18.0
CONDENSATE FLASH TANK C-9001 LEVEL CONTROLLER (CONTROL LOOP DIAGRAM SHEET 21)冷凝闪蒸罐 C-9001 液位控制器（控制回路图表，表21）
LIC-9001-4 is a split range level controller that controls LV-9001-4B to add demin water to Condensate Flash Tank C-9001 or LV-9001-4A to release low pressure condensate from the tank, depending upon deviation from setpoint.
LIC-9001-4是一个分程液位控制器，控制LV-9001-4B补脱盐水到冷凝闪蒸罐C-9001， 或控制LV-9001-4A来排出凝液罐的液体，这依赖于偏离的设定点。
19.0
CONDENSATE FLASH TANK C-9001 PRESSURE CONTROLLER
(CONTROL LOOP DIAGRAM SHEET 22)冷凝闪蒸罐 C-9001 压力控制器（控制回路图表，表22）
PIC-9001-8 is a split range pressure controller that controls PV-9001-8B to add nitrogen to Condensate Flash Tank C-9001 or PV-9001-8A to vent low pressure steam from the tank, depending upon deviation from setpoint.
PIC-9001-8是一个分程压力控制器，控制PV-9001-8B来增加氮气到冷凝闪蒸罐C-9001，或控制PV-9001-8A来排放罐内的低压蒸气，这依赖于偏离的设定点。