Bulk Filling Losses Reduction topics in trucks for cryogenic liquids in horizontal tanks

EasyChair Preprint 3382, version 2

Abstract

Abstract– This study was made in order to identify the significant process variables in cryogenic liquids trucks filling with the intention to avoid product losses caused by a high vent valve flow to depressurize the truck tank during the cryogenic liquid filling process. The analyzed variables were an incorrect filling operation process including a high flow rate in purge vent valve, the initial truck pressure as well as the quantity of product loaded. The study begins by solving the initial problem that is to have an incorrect measurement caused by a not adequate method to calculate the level in cryogenic storage tanks. The results of this work were a measurement reliability improvement for the levels in horizontal cryogenic tanks of two plants, a reduction of 50% of the losses in trucks filling with liquid argon as well a total reduction for liquids of nitrogen and oxygen wasted (30 tons / month for each product). The total reduction for N₂ and O₂ liquids allows to avoid hazardous atmospheres (Levels below 19.5% are considered oxygen-deficient) for the operators and people on site due to avoid a complete reduction from venting valve flow to the atmosphere. After different statistical analysis, It can be concluded with 95% certainty that the amount of cryogenic liquid loaded is a significant variable in the waste of the loading process.

Keyphrases: Cryogenic liquid, DMAIC methodology, Horizontal tanks, NPSH, Road tanker filling

@booklet{EasyChair:3382,
  author    = {Alan Alberto Ramírez Guevara},
  title     = {Bulk Filling Losses Reduction topics in trucks for cryogenic liquids in horizontal tanks},
  howpublished = {EasyChair Preprint 3382},
  year      = {EasyChair, 2020}}