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Enron Mail |
FYI
---------------------- Forwarded by Todd Peterson/ENRON_DEVELOPMENT on 02/14/2001 10:31 AM --------------------------- Larry Snyder@EES 02/13/2001 09:57 AM To: Rick Sierra/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT cc: Victor Vega/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Todd Peterson/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Wayne Perry/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Jaime Banchs/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT Subject: Methane Artic Discharge 2/12-13 The discharge of the LNG cargo was sucessfully completed this morning at approximately 5:30 AM. The ship sailed at around 9 AM today. Below are the highlights of discharge. At around 1:20 AM the UPS system (Uninterruptible Power Supply system) failed causing loss of power to alarm and control system. This activated ESD and unloading was safely shutdown with no problems. It took approximately 2 hours to identify the UPS system as the problem, bypass the UPS so power was supplied directly from line (not through UPS) and restart pumps to full rate unloading. Bypassing UPS only required throwing switch to line setting as system is set up to accommodate problems with UPS. Eco will investigation the UPS system to correct the problem. Eco had planned on loading liquid nitrogen (LN2) to the ship before cargo discharge started. Eco had a preliminary procedure they had prepared for LN2 loading. Coast Guard had not reviewed a procedure for LN2 loading so wanted staff to review the document before LN2 loading. It was agreed LNG unloading would proceed and LN2 loading would occur after cargo discharge was completed. A copy of procedure was sent to Coast Guard's San Juan office for staff review. Within 2 hours the Coast Guard had approved loading the liquid nitrogen after the cargo discharge was completed. Eco will prepare an official procedure and submit it to the Coast Guard as an addition to the procedures previously submitted. Eco had pre-cooled the LN2 line in preparation for loading onto the ship. The line was allowed to warm up and cooldown occurred the next morning (13th) during the cargo ratedown. Once the last cargo pump was shutdown the loading of LN2 began. The LN2 transfer went very slowly. The Methane Artic used a 1 and 1/2 inch stainless hose to connect Eco's loading line to ship's manifold. Eco's line is a 3". It was obvious the ship was in a hurry so they decided that after increasing the level in one of its' two tanks by approx. 11% that they had enough LN2 and ceased the loading operation. Disconnection of the vapor and LN2 lines were completed and the ship sailed shortly thereafter. The ship loaded very little LN2 and obviously didn't really need much although they were low (only 29% in one tank). There were several minor leaks at flanges in the LN2 loading system. Leaks were small and nitrogen safe so loading was not stopped for warming up line and tightening the bolts. These leaks were identified and flanges will be tightened during the next week. With the problems of the UPS failure the operators forgot to shutdown the sample collection system. This will probably result in a bad composite sample. I have already discussed with Victor Vega the need to have a person only follow the LNG sample collection and analysis during the entire period of the cargo discharge. They would have no other responsibility. I had previous had discussion with the Eco chemist Luz regarding a testing program to take place after this discharge to give additional support to prove the sample system works. I will follow up this week to ensure test takes place within the next week. I will need Eco's management support with scheduling this. ---------------------- Forwarded by Todd Peterson/ENRON_DEVELOPMENT on 02/14/2001 10:31 AM --------------------------- Larry Snyder@EES 02/13/2001 11:10 AM To: Rick Sierra/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT cc: Victor Vega/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Todd Peterson/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Wayne Perry/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT, Jaime Banchs/ENRON_DEVELOPMENT@ENRON_DEVELOPMENT Subject: Methane Aritc Discharge 2/12-12 One item I forgot to mention was that there was high winds for approx. 45 minutes during the early part of the cargo discharge (around 3-4 PM) on the 12th. Wind speed gusted to 38 knots. The guidelines given to the coast guard for wind speeds was a sustained wind speed of 30.8 knots for stopping cargo discharge. When the winds came up to the 30.8 Eco started discussions with ship's chief mate and contacted local weather agency to get an idea of weather forcast. Winds were not expected to remain at the extremely high level for very long and ship maintained itself alongside, so the discharge continued with constant monitoring of the situation.. If it had been a Moss-Rosenburg design ship, I would have recommended that Eco shut down the unloading until the winds subsided. The Coast Guard rep. was aware of the conversations which took place between the ship and shore and was pleased with how Eco handled the situation.
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