A
ABB
Agip Petroli
ALBA
Alstom
AMEC
AMOC Egypt
Amoco
Ancap
Atofina
B
Bapco
Bechtel
Black & Veatch
Borgas
BP
C
Caltex
Ceska
Cepsa
Chevron
Conoco
Cyprus Petroleum
D
DKV
E
Ecopetrol
Elf
Emtrol
Engen
ENI
Engineers India
Esso
Essar Refinery
ExxonMobil
F
Fina
Formosa Petroleum
Foster Wheeler
H
HAR
Hindustan Petroleum
Holborn Refining

I
IAG
ICI
IFP
INA
Indian Oil Co Ltd
Irving Oil
J
Jacobs Engineering
JGC
K
KBC
KBR
Kellogg
Khartoum Refining
Koa Oil
KTI
Kuwait Petroleum
Kvaerner
L
Litwin
Lurgi
M
Marathon Ashland
Maraven
Mider
Mobil
Motor Oil Helas
N
Natref
Nigerian Petroleum
Norsk Hydro
O
Oil Refineries Ltd
P
Paz Refining
Petromar
Polimeri
Pertamina
Petroplus
Preemraf
Q
Qatar Petroleum

R
Raytheon
Reliance Petroleum
S
Sadaf
Samref
Saras
Sassol
Scanraf
Shell
Snamprogetti
Sofregas
Sohar Refinery Corp
Ssang Yong Oil
Statoil
Stone + Webster
T
Tamoil
Technip
Technipetrol
Tema Oil
Texaco
Thames Water
Total
Tupras Izmit
Turkmenbasi Oil
U
UOP
V
Van Tongeren
Veba Oil
WXYZ