| |
Why Jensen Vari Angle Side Entry Tank Mixers
Should Be Used On Crude Oil Tanks:
|
| 1). Increase storage capacity by elimination B.S.&
W. |
| 2). Remove risk of water/sludge breaking free and
entering de salter causing de salter loads considerably above normal. |
| 3). Avoid extended loss of tank use by traditional
mucking out routines. |
| 4). Avoid cost of traditional tank cleaning operations. |
| 5). Have tank readily available for emergency repairs. |
| 6). Avoid stratification, uniformly blended crude
cargo to refinery. |
| 7). Solids represent at best a few % (1-2% according
to Shell Oil Co.) of tank bottom sludge. Most sludge is re finable
oil. Tank bottom sludge represents an inventory not being used.
A 286' ø tank contains 11,437 bbls/ft. So 2-3 ft. of sludge
represents 22,874 - 34,312 bbls of "lost" cargo/tank. At $15.00/barrel
that is $434,000 - $514,680 recovered per tank. |
| 8). Jensen is the only mixer with propellers individually
pitched to draw 90% available motor HP for the given application.
All others are a compromise - sometimes severe. |
| |
| Initial Solids Suspension Control: |
| Run mixers while filling tank & shut-off 1-2 hours
after tank is full. |
| re-start mixers 4-6 hours prior to pumping out &
initially check for solids content every hour until solids reach
maximum allowable. |
| Repeat this operating procedure until pattern can
be established allowing a determination of number of hours of mixer
operation that yields maximum allowable solids concentration. |
| Once the tank bottom is clean the incoming solids
should be sufficiently low in concentration to pump them back out
ensuring that the tank bottom remains clean. |
| |
| References: |
| A). "Source Control Pays Off for Chevron" -
Oil & Gas
Journal, 8/7/78 |
| B). "Tank Mixing of Crude Oil" - Pipeline
Technology, 11/8/54 |
| C). "Jet Mixing of Two Liquids" - A comparison
showing the distinct advantage of mixers over Jet Nozzles. |
| D). "A Discussion of Refinery Tank Cleaning" -
H.E. Knowlton, 5/10/83 |
| E). Excerpts from Royal Dutch / Shell Group Tech
Spec for Side Entry Mixers - Source: DEP-31.51.10.31 Gen.PG12 & 13
(special note: This data was adopted directly from Jensen's Recommended
Practice). |
| |
| Experience: |
| Jensen has more than 12,000 Vari-Angle Tank Mixers
in service worldwide on crude oil, No. 6 F.O. & Bunker Tanks. Major
users are Shell Oil Co., Sunoco, Coastal, Valero, Aramco, Mitsubishi,
Caltex, Pemex, Petrobras, Statia, TransCanada Pipeline, Lagoven,
Chevron Texaco, Exxon Mobil, Conoco Phillips, Rayong, Yukone &
Irving Oil. |
| |
| Previous Page |
