If RB 110.29 is closed during unloading arms drain, because D-101 is isolated, sudden LNG flow to the D-101 can cause the vacuum condition in D-101.To prevent the vacuum condition, RB 110.29 needs to be open normally. In this case, because D-101 is connected with BOG header, the vacuum condition inD-101 is not expected.
Thus, "normally open' condition applies to RB 110.29.
For Manzanillo LNG Terminal project, schedule is most important andthe tank cool-down is the one of major factors for schedule. Because cool-down of unloading line is most significant process for tank cool-down, it willbe carefully operated. Thus, cool-down procedure for unloading line is developed.
Attachment 3. PR-PC-201, Detailed Cool-down Procedure forReceiving Part
There is a request for reviewing whether pump is able to operate during filling LNG in tank. Response of Whessoe is as shown below:Guidelines for the permissible proximity of pump columns (M1, M2) may be found in ANSI 9.8-1998 (American National Standard for Pump Intake Design). Section126.96.36.199.4 of this code specifies that where partition walls between pumps are not required, the pumps should be no closer than 4 diameters. Thespecification is applicable to design flows less than 315 ltrs/s.
In this instance the design flow rate of the pumps is approximately 155 ltrs/s each. Thespacing of the pumps on the drawing is approximately 4.5m, equating to approximately 5.9 diameters. As such it is concluded that pump spacing is adequate.
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