- Air Products & Chemicals Inc, PA
- Altairstrickland, La Porte, TX
- Bauer & Sons Construction
- Big West Oil Llc, UT
- Blackburn Construction
- BP Amoco Chemical, Tulsa, OK
- BP Products, Toledo, OH
- Catspec, Ltd, La Porte, TX
- B&I Engineering, The Woodlands, TX
- Century Plastics
- Cherne Contracting, Roxana, IL
- Chevron Phillips, Border, TX
- Chevron Phillips, Sweeny, TX
- Chevron, UT
- CHS Laurel Energy Ops, Laurel, MT
- Coffeyville Resources, Coffeyville, KS
- Conoco Phillips Bell Chase, LA
- Conoco Phillips, Billings, MT
- Conoco Phillips, Kuparuk, AK
- Conoco Phillips, Linden, NJ
- Conoco Phillips, Ponca City, OK
- Conoco Phillips, Rodeo, CA
- Conoco Phillips, West Lake, LA (shipped to Saudi)
- Conoco Phillips, Wilmington, CA
- Convent Refinery, LA
- DMS
- DuPont, TX
- Eastman Chemical Co, Kingsport, TN
- Equistar Chemicals, Houston, TX
- Exxon Mobile, Baton Rouge, LA
- Exxon Mobile, MT
- Federal Steel & Erection Co
- Flint Hills Resources, Corpus Christi, TX
- Flint Hills Resources, North Pole, AK
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- Flint Hills Resources, St. Paul, MN
- Flying J, UT
- Frontier El Dorado Refining, El Dorado, KS
- Global Crane, LA
- Gross Mechanical Contractors
- Hanna Heating and Air, Wichita, KS
- Hertz Equipment Rental, LA
- Hess Oil, NJ
- Hovensa, St. Croix Refinery, Christiansted, VI
- Inserv, Tulsa, OK
- Invista, TX
- J.F. Electric
- JH Kelly Inc, MT
- Jones-Blythe Construction
- JV Industrial, La Porte, TX
- Key Construction, Wichita, KS
- Koch Nitrogen, NE
- Koch Nitrogen, IA
- Koch Nitrogen, KS
- Koch Nitrogen, OK
- LG Constructors
- Lion Oil Company, El Dorado, AR
- Lyondell Chemical
- M A Mortenson Co
- Marathon Oil, LA
- Marathon Petroleum Catlettsburg Refinery, Tulsa, OK
- Marathon Petroleum, St. Paul Park, MN
- MMR Constructors, INC.
- Murphy Oil, LA
- National Cooperative Refinery Association, McPherson, KS
- Oneok Partners, OK
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- Pierce Leasing Inc, MT
- Placid Refining, LA
- Process Systems, Inc
- Public Service Company of New Mexico, NM
- Repcon, Corpus Christi, TX
- Satellite Shelter, MN
- Satellite Shelters, KS
- Satellite Shelters, LA
- Satellite Shelters, MO
- Shaw Group, Baton Rouge, LA
- Shell Lubricants
- Shelley Electric, Wichita, KS
- Sprint Safety, Baytown TX
- Sunoco, Toledo, OH
- Central Mechanical Construction
- Tecon Services Inc., OK
- Tesoro, ND
- Total Petrochemicals, Deer Park, TX
- Total Safety, La Porte, TX
- Triad Electric & Controls, Deer Park, TX
- Triplex Air Breathing Services, LA
- Valero Refining LP, San Antonio, TX
- Valero, LA
- Veolia, LA
- Wal-Mart
- Wegman Electric Co.
- Westar Energy/Gordon Evan Ctr.
- Wichita Country Club, Wichita, KS
- Williams Field Service, Tulsa, OK
- WRB Refining, LLC Woodriver, IL
- WRB Refining, LLC, Borger, TX
- Wynnewood Refining, Wynnewood, OK
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