lls-b manual - no sensor - anchorage tank...7 cleaning the plate packs 8 troubleshooting 9 tank...

1LLS-B Oil Water Separator Manual

Anchorage Tank &

Welding Inc.

Oil WaterSeparatorLLS-B

• Operation

• Maintenance

FacetInternational

2 LLS-B Oil Water Separator Manual

Table of Contents2 Introduction3 Internal Configuration4 Safety4 System Installation5 System Operation5 Initial Start-Up5 Normal Operation5 Maintenance6 Re-installation of Plate7 Cleaning the Plate Packs8 Troubleshooting9 Tank Coating11 Drawing


IntroductionYour Anchorage Tank & Welding, Inc. oilwater separator is an enhanced gravitypassive system for the removal of oil andsolids from waste water. Oil droplets,being lighter (lower specific gravity) thanwater, tend to rise and separate from thewaste water. In a similar manner, thehigher specific gravity (heavier) solid par-ticles fall to the bottom of the separator.

To enhance this separation, the Anchor-age Tank & Welding, Inc. separator utilizesthe Facet International MPak® system. TheMPak® is an assembly of special patentedcoalescing plates (U.S. Patent No.

4,897,206) to remove droplets much more ef-ficiently than simple gravity separators.Please note that this system is designed forthe removal of free oil from water. It will not,however, remove dissolved hydrocarbons orbreak emulsifications.

The coalescing plates are made of calciumcarbonate-fillet polypropylene, stacked andbound together with sturdy rods and supportsinto modular plate packs known as MPaks®.MPaks® are available in either 1/4" or 1/2”nominal plate spacing, although 1/2" spacingis preferred in underground separtators..


Internal Configuration

merge to form larger droplets what will risethrough the holes located at the peaks. Theoil droplets will continue to rise to the top ofthe separator to form an oil layer which canbe removed periodically from the separatorby means of a vacuum truck. Frequency ofoil removal from the separator will dependupon the amount of oil entering the unit.

Most of the solids drop to the bottom nearthe inlet pipe. Some additional solids enterthe plate packs and are separated there. Solidparticles that are captured by the plate packsfall to the bottom of the plate area throughholes in the valleys of the plates. Space hasbeen provided under the plate packs for thesesolids.

The processed water flows out of the coa-lescing plates and upward into the outletchute. The pipe inside this chute has an ad-justable coupling to set the liquid level in theseparator. The water flows over this couplingand out the separator and into the plumbing(sanitary or storm drain) system.

The Anchorage Tank & Welding, Inc. LLS-B ba-sic oil water separator is for either abovegroundor underground installation on the floor slab of abuilding, in a single wall configuration.

A cross sectional flow schematic and basicshop drawings of your separator are includedwith this manual. These drawings reveal the in-ternal configuration that includes an inlet pipe,pre-separation chamber, MPak® coalescingplates, exit pipe, and any additional optional fea-tures.

The oil/water mixture enters the separator downthrough an inlet pipe then turns up toward thetop of the tank so that the incoming fluid mo-mentum can be dissipated. Oil already separatedin this upward moving liquid will rise directly tothe top of the tank, and the remainder of the mix-ture will flow into the coalescing plates.

As the oil/water mixture passes horizontallythrough the plates, the oil droplets rise to meetthe bottom of the plate above them, where theyare collected. From this point the oil droplets

UndergroundModel

AbovegroundModel


a) Normal fire prevention measures andsafety precautions must be exercised in ar-eas where free hydrocarbon products exist.

b) Care shall be taken in keeping the areacleansed as oil/water mixtures can produce slickareas and hazardous footing for personnel.

Safety

System InstallationFlow into the separator should not exceedthe recommended flow rate for your particu-lar application. The maximum allowable flowrate may be found on the Plate Pack Analy-sis provided with this manual. The tank mustbe vented to the atmosphere. The flowthrough the separator is normally gravity flow.

The separator tank should be level to within1/16" per foot.

It is recommended that the water effluentpipe (in addition to the inlet pipe) be gravityflow. The outlet pipe must be arranged so asto be free flowing. If the outlet pipe is toosmall or has a high pressure drop, water willback up into the separator, causing prob-lems. External piping should be supportedseparately with back fill, not supported fromthe separator.

To install the separator, follow these steps:

1) Since your system is an underground model, refer to the STI-P3® installation instructions included herein. Note: To minimize mainte-

nance intervals it is recommended that a grit trap be installed upstream of the separator.

2) Connect the oil/water inlet piping to the separator inlet connection.

3) Connect vent plumbing.

4) Connect the water outlet piping to the wateroutlet connection.

5) Install wiring and control panel for level sen- sors and tank leak sensor. Detailed instruc tions are included in this manual.

6) Place grade ring manholes or optional custom manhole. The skirts of these manholes

(or any other metallic objects) must not comein contact with the tank, as the Steel Tank

Institute warranty will be void.


System Operation

Initial Start-Up

The following procedure shall be followed afterthe installation of the separator or after the sepa-rator has been drained or pumped out, and isready to be restarted. This procedure assumesthat the separator is delivered with plate packsinstalled. If the plates are to be field installed,follow the procedure provided in the Maintenancesection below.

1) Ensure there are no obstructions in the inlet or water outlet pipes.

2) Remove covers to reveal tank interior.

3) Fill the tank with clean water (to avoid contaminating the separator outlet area with oil) until it flows through the outlet pipe.

4) After 15 minutes of run time, take a sample of the effluent for testing, if required.

5) The liquid level in the separator will dropan inch or two when the flow is reducedor shut off. This is due to normal backpressure in the unit.

Normal Operation.

During normal operation the separated oil will rise to the surface and displace the water. Even-tually, the oil level will be thick enough that it will reach the designated level sensor which willsend a signal to the control panel indicating that it is time to pump out the contained oil. Asecond level switch, located lower in the tank, will send another signal that means the separa-tor has reached a very high level of oil holding capacity and needs to be pumped out soon.Ignoring this signal could result in oil being released from the tank.

MaintenanceNote: When hosing your facility floor andequipment, use only recommendeddegreasers such as AMEROID OWS QuickSeparating Degreaser. Commercial soaps anddetergents will cause unbreakable emulsifica-tions in the separator, causing the separatorto cease functioning.

1) After the initial 1000 hours of operation, theseparator tank should be inspected andcleaned out if necessary as follows:

a) Remove covers.b) Remove water from the tank. Plate

It is recommended that the separator beclosely monitored during the first several

weeks of operation.

6) Replace covers


packs may be cleaned in place with the MagicWand (See Section 5.5). However, if it isdetermined that the plate packs must be re-moved, then proceed.

c) Locate the pull-out cords on the coa-lescing plate pack(s), and with a fork-lift (orother equipment) lift straight up and out ofthe unit.

Note: The quantity of sludge found in the tankshould be used as a basis for determining thenext interval before cleaning. If sludge is imping-ing on the plate pack(s), then the maintenanceschedule should be shortened, otherwise, it canbe lengthened.

2) Should it become necessary to clean the platepack(s), lift the plate pack assembly as detailedin Maintenance 1),c), however, do not removethe assembly from the tank. Lift the assemblyto a point where the plate pack(s) are acces-sible to clean.

The Facet MPak® plates are designed to becleaned in place using a special cleaning wand(Facet part number 60517464) and city waterpressure. The wand has a connection just likean ordinary garden hose and is equipped with asmall conical strainer in the connection so thatsolids in the inlet water will not clog the cleaningholes. (See drawing number 6051764) The platepack(s) can also be cleaned using a 1½" firehose at 10-15 PSI or a standard garden hose atnormal house pressure (30-35 PSI). In a similarmanner, steam can also be used to flush theplate pack(s).

Re-installation of Plate Packs Note:

DO NOT disassemble the plate pack assembly.

The coalescing plates do not need tobe cleaned until they are white. A thincoating of oil does not deteriorate the per-formance.

Caution should be taken that thecleaning process does not result in a pol-lution problem.

Replace plates in reverse order of removal,please note the following:

a) The plate pack(s) are designed to fitsnuggly within its housing.

b) Install plate pack assemblies one at a time.

c) Be sure that the plate pack assembly is resting on its seat.

d) Check to see that no possibility of fluid by-passing can occur around the plates and sidewalls of the tank, as well as be tween plate pack assemblies, since this could deteriorate the efficiency of the separator.

e) Replace the retaining angles, if applicable.

f) Restart the separator as outlined in sec tion Initial Start-Up.

d) Hose down the tank interior and sweepor vacuum all sediment out of the inlet andcoalescing chambers.

e) Examine tank interior for damage tointernal coating. Contact Anchorage Tank &Welding, Inc. for touch-up paint.

f) Replace plate pack(s) in the reverseorder of removal, item c.

g) To restart, follow the steps in InitialStart-Up.


Cleaning the Plate Packs

Facet International MPak™ oil water separatorplate packs are self-cleaning, but even self-clean-ing packs can become clogged with solids un-der adverse conditions. For this reason, theyare designed so that they can be cleaned in placeto remove accumulations of solid particles.

Plate type separators that are provided in largemodules must be lifted out of the separator by acrane when contaminated with dirt. This is in-convenient and expensive, and it is possible todamage the packs during removal or reinstalla-tion.

Facet MPak™ plates are designed to be cleanedin place using a special cleaning wand (Facetpart number 6051764) and city water pressure.The wand has a connection just like an ordinarygarden hose and is equipped with a small conialstrainer in the connection so that solids in theFacet MPak® plates may either be cleaned inplace or removed and cleaned. To clean thepacks, first stop the flow to the unit, remove theoil, and drain the water.

For cleaning in place, connect a pressure waterhose (at least 60 psig) to the special cleaningwand. Provide a vacuum truck or other meansof disposing the sludge and dirt in the tank. Turnon the water to provide a spray from the wandandinsert the tip of the wand slowly into eachhole of the plate pack, starting at the upstream

CAUTION: The spray wand produces a vigorous spray. Operators should

wear waterproof clothing and goggles or face mask.

end. As the water flushes the dirt out of theplate packs, it should be removed by thevacuum hose or directed to an oily watersewer if one is available.

For cleaning outside the tank, remove platepacks and other internals. Flush with hoseand cleaning wand to an oily water drain.


Troubleshooting

TROUBLE POSSIBLE CAUSEDIAGNOSTICTECHNIQUE

CORRECTIVEACTION

PROCESSEDWATER HAS OIL IN

IT

FLOW TOO GREATFOR APPLICATION

CHECK FLOWSLOW THE FLOW

RATE

LEAKAGE AROUNDOIL DAM

REMOVE COVERAND INSPECT

SLOW THE FLOWRATE

PLATES BLOCKEDREMOVE PLATES

AND INSPECTCLEAN AND

REASSEMBLE

TANK ISOVERFLOWING

OUTPUT LINERESTRICTED

CHECK FLOWREMOVE

RESTRICTION

lls-b manual - no sensor - anchorage tank...7 cleaning the plate packs 8 troubleshooting 9 tank...

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