Document YDEap2ODOvnZ9bjokqZ8e3wNk

Ethanolamines/Glycol Ethers In Plant Training (IPT) Section Number issue Number Origination Date Revision Date Section Test 4B 1.2 08-05-91 12-09-94 :4B Author: Keith Bonanno Ethanolamines - Ammonia System D-210 -E-210- P-210 A/B Answers: 1. Physically locate. A. P-210 recirculation control loop B. Anhydrous ammonia recirculation control loop C. T-220 overhead line to E-210 D. D-210 ammonia control valve 2. Explain the operation of D-210 and E-210. E-210 is a cooling tower water exchanger which cools down T-220 and D-218 overheads and removes the heat released when ammonia vapors are absorbed by water. Anhydrous ammonia is fed into D-210 to replace the ammonia used in the reactor. The P-210's pump D210 bottoms back to the top of E-210 as recirculation. It is this flow which will absorb the vapors from T-220 and D-218 overheads. The P-210's also pump to the suction of the P-212's which pump aqua ammonia to the reactor, R-201. The level is controlled in D-210 by T-211 bottoms which joins in with D-210 bottoms recirculation to E-210. A vent is taken on D-210 to remove inerts, mainly nitrogen. This vent goes to E-211 or T-211 to and control the pressure in T-211. 3. State what flows go into D-210 and E-210. Into D-210. A. Anhydrous ammonia from DS-205 B. P-212 recirculation C. Hot condensate is piped up but only used at shutdowns Into E-210. A. T-220 and D-218 overheads (mostly ammonia) B. Cooling tower water C. Recirculation from D-210 and T-211 bottoms 4. Explain why an exchanger is needed to mix ammonia and water. When ammonia goes into solution with water, heat is released. E-210 removes this heat and helps keep the pressure low. Date Printed: April 18,1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File. T:\ORIGINAL\IPT\EAFRONT\NH3SYSTM\AD210.DOC Page 1 of 2 DO A 05878? CONFIDENTIAL 5. State to where the P-210 pumps. P-210 pumps to the top of E-210 as recirculation and to the suction of the P-212's. 6. Explain what happens when the p-210 shuts down. P-210 shuts down - there is no more flow to the top of E-210 which would pressure up D-210 because the ammonia vapor from T-220 and D-218 overheads would not be going into solution. Also, the P-212's would cavitate because the flow into their suction would be drastically reduced. The reactor would shut down and the P-212's would go on total recirculation, but would not shut down. 7. Explain why we take a vent off D-210 and what the vent is made up of. The vent on D-210 is made up of ammonia and nitrogen vapors. We try too remove all the nitrogen from D-210 so that we won't get a false ammonia concentration reading. The nitrogen would cause D-210 to pressure up and give the appearance of more ammonia present than actual. 8. State where the vent from D-210 goes. The vent from D-210 can go to E-211 or to T-211 or both and is used to maintain T-211 pressure as well as remove nitrogen from the system. 9. flow Explain how the level in D-210 is controlled. The flow from T-211 bottoms controls the level in D-210. Since we are always taking out a through the P-212's to the reactor, we need to have a flow constantly making up to D-210. As the level in D-210 rises the flow from T-211 drops off. As the level in D-210 falls the flow from T-211 bottoms picks up. 10. State what type seals are used on P-210. Tandem mechanical seals. Revisions: Revision No. 1 06-09-93 Yearly review Revision No. 2___________ 12-09-94__________ Yearly review Date Printed: April 18,1998 Paper Copies Of This Document Are Uncontrolled & Not Subject To Update. The Controlled Document Resides In File: T:\ORIGINAL\IPT\EAFRONT\NH3SYSTM\AD210.DOC Page 2 of 2 [50 A 058783 CONFIDENTIAL