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Highland Tank HT-2050 User Manual

Underground cylindrical oil/water separators
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Built on Tradition
Underground Cylindrical
Oil/Water Separators
User Manual
Installation, Operation & Maintenance
Carefully read and follow the instructions in this manual.
HT, HTC, UL-SU2215
Single-wall & Double-wall
Series G, J & TF
Models with EZ-Access Option
MADE IN
U. S. A.
814 • 893 • 5701 | highlandtank.com
HT-2050

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  • Page 1 Built on Tradition Underground Cylindrical HT-2050 Oil/Water Separators User Manual Installation, Operation & Maintenance Carefully read and follow the instructions in this manual. HT, HTC, UL-SU2215 Single-wall & Double-wall Series G, J & TF Models with EZ-Access Option MADE IN U.
  • Page 2 Highland Tank disclaims all liability related to any misuse of the oil/water separator or failure to follow all guidance and instruction provided by Highland Tank.

  • Page 3: Table Of Contents

    OWS Reference Drawing Appendix - A - Sample Inspection and Maintenance Log Introduction Thank you for purchasing a Highland Tank Oil/Water Separator - the leading high-performance separator in the industry. The purpose of this manual is to provide detailed information on the installation, venting, startup, operation, maintenance and trouble-shooting of Highland Tank’s Oil/Water Separator.
  • Page 4 Important points to consider prior to installation, operation and maintenance of the OWS: Carefully read and follow instructions in this manual. Local codes and ordinances may apply. Check with local AHJ prior to installation of OWS. • Ensure adequate site space - almost all products are delivered on a 75 foot long tractor-trailer. Allow space for unloading, positioning and temporary storage if applicable. Contact Highland Tank if special delivery considerations are needed. • Ensure the crane has adequate lifting capacity and clearance - have operator check site for clearances (overhead, turning, etc.). Spreader bars may be required for larger OWSs. • Ensure that installation staff have knowledge proper procedures and inherent dangers associated with OWS installation for the storage of flammable and combustible liquids. Reliance on skilled, professional staff, can help avoid system failures and accidents. • OWSs that are 10 foot diameter and larger are typically shipped rotated to minimize over-the- road height. They must be lifted from the hauling trailer by the supplied lifting lugs on the heads of the OWS. They must then be rotated before final lifting into the excavation. Spreader bars and/or adequate lifting straps/chains must be available to maintain recommended safe lifting capacity.
  • Page 5 Important points to consider continued: • IMPORTANT: DO NOT modify OWS structure in any way. DO NOT weld on OWS. • Wastewater containing high concentrations of dissolved solids (such as untreated sanitary sewage) must be excluded due to its emulsifying tendency. Wastewater, which exhibits high Biological Oxygen Demand, Chemical Oxygen Demand, and Total Suspended Solids may require additional treatment after the OWS. • The OWS will not remove chemical or physical emulsions, dissolved hydrocarbons, solvents or Volatile Organic Compounds. Installation of an appropriately sized Advanced Hydrocarbon Filtration System (brochure HT-2502) is recommended for treatment of wastewater contaminated with these pollutants.
  • Page 6 Standard OWS Highland Tank’s OWS is a wastewater treatment tank used to Description intercept and collect free-oil, raw petroleum hydrocarbons, grease and oily-coated solids from a wastewater stream. They are typically required in all facilities that conduct washing, servicing, repairing, maintenance or storage of motor vehicles including car washes, commercial vehicle garages, repair facilities, service stations and similar sites where oil or flammable liquids may be introduced into a sewer system.
  • Page 7 Model HTC Oil/Water Separator with EZ Access option shown. *Optional equipment available from Highland Tank. **Installer supplied equipment www.highlandtank.com • 7...

  • Page 8: Installation

    Under no circumstance should chains or slings be used around Max. 30º the OWS shell. Always use two lifting lugs to lift OWS. Highland Tank ® www.highlandtank.com Installation & Maintenance Instructions are available at www.highlandtank.com Use spreader bar Max. 30º when necessary Highland Tank ®...
  • Page 9 Any damage that could result in leakage or corrosion must be repaired in a manner approved by Highland Tank. Please refer to coating repair instructions below. If an OWS is not buried within 90 days, the OWS should be covered to protect the exterior coating from the effects of ultraviolet light damage.
  • Page 10 Coating Repair Fig. 2 continued As part of Highland Tank’s quality control program, all HighGuard, and ACT-100-U coated OWS receive a holiday detection test at the ® factory to ensure coatings are uniform and without holidays. After repairs have been completed, all repaired areas of the HighGuard and ACT-100-U protection system coatings shall be ®...
  • Page 11 Pre-installation Tightness An appropriate pneumatic or hydrostatic test may need to be Testing Procedures performed prior to placing OWS into service, as outlined below. Factory-applied vacuum test may be substituted for on-site testing. Check with AHJ for approval. Take all necessary safety precautions during air tests. IMPORTANT: DO NOT leave OWS unattended. DO NOT apply a vacuum to a single-wall OWS or to the primary tank of a double-wall OWS.
  • Page 12 Pre-installation Tightness Testing Procedures continued Double-Wall OWS Double-wall OWSs require different air pressure testing procedures. Air Test DO NOT connect a high-pressure air supply line directly to the interstitial monitoring port. A double-wall OWS shipped with a vacuum on the interstice need not be subjected to an air/soap test, if approved by AHJ and provided the OWS arrives at the installation site with the vacuum level within designated limits.
  • Page 13 OWS arrives at the installation site with if Required by AHJ the vacuum level within limits designated by Highland Tank. If the OWS did not ship with a vacuum on the interstice or vacuum has decayed, proceed with the vacuum test as described for Consult Highland Tank if OWS does not hold vacuum.
  • Page 14 3 - Wait for gauge to read 12-15 in. Hg. 4 -Close Valve A completely. 5 - Remove air supply line Monitor gauge for one hour or as prescribed by AHJ. Gauge MUST NOT fluctuate more than 2 in. Hg for the duration of the vacuum test. If leak is detected, contact Highland Tank. After successful vacuum test, open Valve A to release vacuum. Remove test apparatus and proceed with installation. Refer to PEI/RP200 for additional testing guidelines. Fig. 5 Air Outlet...
  • Page 15 Excavation and Bedding The excavation should provide adequate space for the OWS(s) piping and associated equipment. It must also be free of any hard or sharp material that could cause damage to OWS coating. Be certain that foreign matter is not introduced into the excavation or backfill. The total depth of the excavation is determined by the OWSs diameter, bedding thickness, hold-down pad (if required) depth of cover (including any effects of vehicular traffic) and slope and length of piping. Consult AHJ for additional requirements related to existing structures. CAUTION: DO NOT exceed maximum burial depth predetermined by manufacturer.
  • Page 16 Remove all large and sharp rocks/debris from excavation prior to lowering OWS into position. 24" Minimum Slope of excavation determined by soil type and/or code. Consult AHJ. Highland Tank ® www.highlandtank.com Installation & Maintenance Instructions are available at www.highlandtank.com Placement of the OWS The OWS must be installed in a level and plumb position.
  • Page 17 OWS shell by an oversized separating pad made of inert insulating dielectric material. Several hold-down methods are available for anchoring the OWS in the excavation. Consult AHJ and choose the method that completely satisfies all requirements for the installation location. Highland Tank’s Deadman Anchoring System employs concrete deadman anchors and polyester hold-down straps. When using deadman anchors, the bottom of the excavation (native earth) shall be covered with a minimum of 12 inches of bedding material suitably graded and leveled. Bedding and backfill shall surround the OWS to a width and depth of 24 inches minimum all around the OWS. Position deadman anchors as shown in Fig. 8,...
  • Page 18 Anchoring When anchoring by means of a concrete pad is required, the OWS continued must not be placed directly on the pad. See Fig. 9. A layer of bedding material, 6 inches deep must be spread evenly over the dimensions of pad to separate the OWS from the pad. Bedding deeper than 12 inches require specially designed hold- down straps. Contact Highland Tank if 12 inch or deeper bedding is to be used. The OWS must not be placed on any other hard or sharp material, which might cause deformation of the OWS or damage to the coating.
  • Page 19 In areas where there is the presence of ground water or a high water table, ballasting may be necessary for additional downward force on the OWS. If required, fill OWS with clean water. After ballasting is complete, check elevations for proper tolerances. Note: Highland Tank recommends maintaining the excavation dewatering process until installation is complete. www.highlandtank.com • 19...

  • Page 20: Piping & Venting

    Piping & Venting Inlet piping installation should be straight and true with as few turns as possible to limit turbulence. (When dielectric isolation is required, consult Steel Tank Institute ACT-100-U Installation Instructions, ® R971 or STI-P3 Installation Instructions, R821 and Petroleum ® Equipment Institute PEI/RP100 for further instructions.) Attach inlet/outlet piping (contractor supplied) to inlet/outlet pipes on the OWS. Inlet and outlet inverts were established during manufacturing. Do not modify without first consulting Highland Tank.
  • Page 21 OWS Venting Guidelines Note: Inlet pipe DOES NOT need to be vented when influent is being continued pumped into the separator. Likewise, if the effluent is being pumped, the outlet pipe does not need to be vented. As shown, the manway vents can be manifolded together to one common vent line. The inlet and outlet vents must each have their own separate, dedicated vent line for the following reasons: • OWS inlet is vented to prevent hazardous gases from building up in inlet pipe draining the catch basin or trench drain (which...
  • Page 22 After testing has established tightness, apply coating to the OWS fittings and allow to cure prior to backfill. Coating must include the entire plug on unused fittings. After all coating touch-up applications, the installer must verify that all of the coating has cured (adequate material hardness and solidification) prior to final backfill that will completely cover the OWS. IMPORTANT Cure time will vary depending on temperature and conditions. Contact Highland Tank if additional touch-up coating is needed. 22 • www.highlandtank.com...
  • Page 23 Final Backfilling Deposit homogeneous backfill carefully around OWS to a depth of at least one foot over OWS to avoid damage to coating especially where tamping is required. Refer to the National Fire Protection Association’s Regulation NFPA 30 and state or local codes for minimum depth of cover required. Finally, carefully deposit backfill over the OWS up to the elevation needed to complete grade level finishing. See Fig. 13 for minimum burial depth. Consult approval drawing for maximum burial depth. Use grade level covers and street boxes to access the manways, sensors, or pump-out pipes. The grade level covers above the access manways must be of a greater diameter (i.e. 36 inch grade level cover over a 24 inch access manway). Fig.
  • Page 24 OWS. All panels include audible/ visual signals to alert the operator of system changes and system test buttons. Highland Tank’s typical standard panels are listed here for quick reference. HTAP-1 Single-channel panel. Performs High-Oil Level sensing OR for Liquid Only Leak Detection with non-specific alarm.
  • Page 25 Oil Level If your OWS has a control panel and sensors installed, locate the Controls diagram for your panel from the five selections and then refer to (Optional) the button/light function listing for operation and required action. continued Please consult the job specific project information should you need detailed information regarding a specific alarm/control panel. Contact Highland Tank if you still need assistance. HTAP-1 - 1-Channel HTAP-2 - 2-Channel High-Oil or Leak Detection High-Oil and Leak Detection or High-Oil and High-High-Oil ALARM #1 SILENCE ALARM #1...

  • Page 26: Description / Function

    Oil Level HT-A2-LDFW - 4-Channel High-Oil, High-High-Oil Controls HTA2LDFW and discriminating (Optional) Fuel/WaterLeak Detection continued NORMAL ALARM HORN HIGH-HIGH OIL FUEL LEAK WATER LEAK HIGH OIL FUEL LEAK TEST WATER LEAK TEST ALARM TEST ALARM SILENCE Below is a listing of Highland Tank’s control panel features. Refer to the previous diagrams to help understand the function of your particular panel.
  • Page 27 Oil Level HIGH-OIL Alerts operator of High-Oil level. Oil has reached a predetermined Controls level and must be pumped out as soon as possible. (Optional) RESPONSE: Stop OWS operation. Pump out oil. Refill OWS with continued water to reset sensors. Resume OWS operation. HIGH-HIGH-OIL Alerts operator of High-High-Oil level. Oil has reached a critical predetermined level and must be pumped out immediately.
  • Page 28 Leak Detection Leak Detection Procedure for fuel or water in the OWS interstice. System Procedure (Optional) For easy and efficient monitoring of the interstitial space, the OWS Double-wall OWS Only may be equipped with a Liquid Leak Detection Sensor to activate warning alarms if the interstitial space becomes filled with hydrocarbons or water during operation. If the audible alarm is activated during operation, it can be silenced by momentarily depressing the SILENCE push-button. The interstitial space can be checked by: Stopping OWS operation. After flow has stopped, remove leak detection sensor from monitoring pipe being careful not to damage...

  • Page 29: Start-Up

    OWS Start-Up IMPORTANT: The OWS must be full of water as described below to operate. CAUTION: Separated liquid oil and vapors are flammable and/or combustible. Service personnel must comply with all established OSHA reg- ulations governing the facility and services. These include, but are not limited to, the use of approved breathing equipment, protective clothing, safety equipment and other requirements.
  • Page 30 OWS Start-Up continued Prior to Oil Level Sensor Oil Level Controls (optional) Installation Check sensor with a continuity meter. Both switches are normally closed in a low position (dry condition). And/Or Connect the sensor to proper panel wiring. Refer to specific panel wiring diagram supplied. Switch on the panel. Move the bottom float up and down on the probe stem. As the bottom float approaches the lower grip ring, the High-High Oil Level Warning Alarm (light and audible alarm) should activate. Move the top float up and down on the probe stem. As the top float approaches the lower grip ring, the High Oil Level warning alarm (light and audible alarm) should activate.
  • Page 31 OWS Start-Up continued Skimmer Adjustment Ensure that OWS is completely full of water, and that water level is at the top of or flowing from effluent transfer pipe. Initiate expected rated flow to oil/water separator. Maximum liquid operating level is established when water surface in separation chamber has stabilized. Make a permanent, waterproof mark, at water level, on the inside wall of the OWS for reference. Stop flow to OWS. Bucket Style Skimmer Adjust the Oil Skimmer’s rubber fitting up or down so that top of fitting is approximately 1/8" above the maximum operating level. Sawtooth Style Skimmer Adjust the Sawtooth Skimmer by rotating the skimmer pipe so that the skimming level (bottom of V-notch) is approximately 1/8" above the maximum operating level mark.

  • Page 32: Operation

    Highland Tank OWSs will not remove oils with a specific gravity greater than designed for, chemical or physical emulsions, dissolved hydrocarbons, solvents, or volatile organic compounds (VOC). Highland Tank has specialty systems that have been designed for treatment of wastewater contaminated with these pollutants. During operation, the wastewater flows into the OWS through the inlet pipe and is directed over the Velocity Head Diffusion Baffle, a reinforced steel plate inclined at a 45 degree angle.
  • Page 33 Petro-Screen The Petro-Screen coalescer intercepts oil droplets too minute to Coalescer be removed by the Corella Coalescer. This bundle of oil-attracting polypropylene fibers traps oil particles down to 20 microns in size. These small particles coalesce into larger globules that eventually break free and rise to the surface. www.highlandtank.com • 33...
  • Page 34 Model HTC Oil/Water Separator with EZ Access option shown. *Optional equipment available from Highland Tank **Installer supplied equipment Outlet Vent Piping** Flanged Monitoring Pipe Manways & Covers Flanged Outlet Piping OUTLET Isolation Spool Piece Manway Vent Piping** (where required) Outlet...

  • Page 35: Maintenance

    Maintenance Separated liquid oil and vapors are flammable CAUTION: and/or combustible. Never enter an OWS or enclosed space, under any condition, WARNING: without proper training and OSHA approved equipment. See OSHA, Regulations for Permit-Required Confined Spaces 29 C.F.R. § 1910.146. All enclosed spaces must be properly vented prior to entry to avoid ignition of flammable materials or vapors. Atmosphere must be properly tested for combustible vapors and oxygen prior to entry.
  • Page 36 Maintenance OWSs with oil level sensors require oil removal when the alarm is continued activated. Stop OWS operation, remove the oil and then refill OWS with clean water (see Start-Up Instructions, page 29). OWSs without oil level sensors require level checking by use of a sampling device or a gauge stick with water finding paste. The OWS must be checked at regular intervals to monitor oil levels. When the oil/water interface level surpasses the high-oil level or 20% of the OWS’s working volume, oil should be removed and the OWS refilled with clean water. At the 43% or high-high-oil level OWS performance will decline. Oil must be removed and the OWS refilled with clean water. Use a gauge stick and water finding paste to check the oil/water interface level.
  • Page 37 Maintenance If the OWS has been cleaned within the year and only bottom sludge continued has built up while the effluent water is contaminant free, it may be sufficient to vacuum the sludge from the sediment chamber and refill OWS with clean water. (See Start-Up Instructions, page 29.) Oil Removal Procedures IMPORTANT: Oil should only be removed during non-flow conditions to ensure pure oil draw off. Note: The procedures outlined here are guidelines. Pure oil, water or sludge draw-off will depend on conditions and operator control.
  • Page 38 Major Oil Spill Response Procedures A major oil spill is a spill that exceeds the normal oil storage IMPORTANT: capacity of the OWS. In the event of a major spill, notify proper authorities as required by federal, state and local laws. After a major oil spill, the OWS should always be emptied, cleaned and refilled with clean water.
  • Page 39 Sludge Removal Determine exactly where the sludge/water interface is located using Procedures a sampling device or a gauge stick. Open the Gauge Port or Chamber Manway. If used, insert gauge stick into the OWS through either the Gauge Port or Manway. Alternately, a sampling device enables taking accurate readings on settled solids to any depth in the OWS.
  • Page 40 General OWS If not properly maintained, the OWS may malfunction. Cleaning Procedures NOTE: Over a period of time sediment, oil and grease will build up on the walls and floors of the OWS. Dirt and heavy oil may also build up on the Corella coalescer, reducing the unit’s efficiency. In ® addition, the Petro-Screen removes some suspended solids along with the small oil droplets in the wastewater. Periodic cleaning of the Petro-Screen is also required. IMPORTANT: It is recommended that the OWS be cleaned as needed or at least once a year.
  • Page 41 Cleaning OWS Disconnect all Oil Level Sensor wiring. Carefully remove the Sensors Oil Level Sensor. Carefully check the Oil Level Sensor floats. If the floats do not slide easily on the stem or have sludge on them, clean the Oil Level Sensor. Use a parts washer and mineral spirits to remove accumulated oil, grease or sludge. Check the Oil Level Sensor with a continuity meter to assure proper operation. Place the Oil Level Sensor in a safe area to prevent damage. Cleaning OWS Remove manway covers over the manways to expose the OWS Chambers...
  • Page 42 Petro-Screen Coalescer Coalescer packs can be removed through the manways for IMPORTANT: cleaning. Mechanical lifting equipment may be required to remove oil-filled packs and coalescer packs in larger units. Note: The coalescer packs should be placed in a convenient location upstream of the OWS. Place coalescer packs on oil-absorbent blanket or sheet plastic for cleaning.

  • Page 43: Troubleshooting Guide

    Troubleshooting Problems which occur during OWS operation can be the result of Guide many factors. The following list identifies the most common problems, their possible causes and suggested remedies. Problem Possible Cause Remedy Excessive oil concentrated Wastewater pumped into the OWS Adjust pump, change in OWS effluent water causing emulsification of oil droplets to different pump or in the clean water change to gravity flow. Add additional treatment Flow rates exceeding rated capacity Decrease flow. causing emulsification of oil droplets in the clean water Presence of detergents or surfactants Detect and remove causing emulsification of oil droplets in...
  • Page 44 Troubleshooting Guide continued Problem Possible Cause Remedy Storm water back-up in Excessive sludge or debris build-up Clean out OWS. drainage area Closed inlet or effluent piping valves Open piping valves completely. Inlet piping vapor lock Check to ensure inlet vent is operating properly. Debris Clean catch basin, trench drains and/or OWS. High suspended solids Excessive sludge or debris build-up Clean out OWS. content in clean water effluent Excessive solids in storm water Install Highland drainage area Collection Catch Basin in front of OWS and clean OWS.
  • Page 45 Series TF Series TF oil water separators have modifications to the standard OWS clear well, or a separate, additional chamber for installation of this oil removal media. The Trickle Filter media consist of small pieces of absorbent filter media that are chemically treated to cause molecular cohesion of hydrocarbons. This media is contained in mesh bags and can be incorporated into any of Highland Tank’s HTC or R-HTC designs. www.highlandtank.com • 45...
  • Page 46 Special Model Media Replacement Cycle - The Trickle Filter media does require Maintenance continued monitoring to determine the need for media bag change-out. Media Series TF replacement should be carried out as needed, but at a maximum recommended period of every 18 months. Monitoring Possible scenarios that will require attention to the media. Oil Breakthrough – The primary purpose of the TF media is for removal of mechanically emulsified oils or high specific gravity oils that were able to make it past the primary coalescers of the HTC / R-HTC separator and / or to remove additional free oils to reduce oil discharge levels from the OWS. Once the TF media reaches its capacity for oil removal, oil discharge levels from the OWS will begin to increase.

  • Page 47: Bag Replacement

    Bag Replacement The Trickle Filter media is typically installed at the factory. To install new media, a portion of the top grating must be removed as needed by unbolting it. After flow to the OWS has been suspended, remove top grating. Remove and properly dispose of the used media bags. Continue with the removal of any residual oils or water that may have drained from the media. Place new media bags on top of the lower grate.
  • Page 48 48 • www.highlandtank.com...
  • Page 51 Stoystown, PA 15563 Manheim, PA 17545 Watervliet, NY 12189 Greensboro, NC 27407 Friedens, PA 15541 Clarkston, MI 48346 Mancelona, MI 49659 (814) 893-5701 (717) 664-0600 (518) 273-0801 (336) 218-0801 (814) 443-6800 (248) 625-8700 (231) 587-8412 © Highland Tank HT-2050 – 12/2023...

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