Following are a few of the companies that have already approved GRP as an installer of glass reinforced piping

• ADCO                                       
• ADNOC
• ALSTOM POWER SERVICE (ARABIA) FZE
• AL HASOUN SEJONG ELECTRO MECHANICAL EST
• AL JABER ENERGY SERVICE QATAR
• ARAB HEAVY INDUSTRIES
• ARCHIRODON CONSTRUCTION (OVERSEASE)
• ADGAS
• ASUT FIBERGLASS
• AMMICO CONTRACTING COMPANY
• BOROUGE
• BLACK CAT CONSTRUCTION
• BABCOCK BORSIG SERVICES
• CONSOLIDATED CONTRACTORS GROUP QATAR
• DOOSAN HEAVY INDUSTRIES
• DOLPHIN (DEL)
• DOHA PETROLEUM CONSTRUCTION
• DEUTSCHE BABCOCK ENERGY
• DESCON
• DOHA PETROLEUM CONSTRUCTION
• ENELPOWER
• FIVES SOLIOS
• FUTURE PIPE INDUSTRIES
• FLUOR MIDEAST LIMITED
• JGC CORPORATION
• IMECO
• KENTECH QATAR TECHNICAL SERVICES
• LARSEN AND TOUBRO
• MADINA GROUP
• MAERSK OIL QATAR
• OMAN PROMAN CONTRACTING AND TRADING LLC
• ONDEO DEGREMONT
• OTV
• OXY OCCIDENTAL PETROLEUM OF QATAR
• QAFCO
• QAPCO
• QATOFIN
• QATAR GAS (FOR ORYX GTL)
• QATAR VINYL COMPANY LTD.
• QATAR ENGINEERING CONSTRUCTION
• Q POWER (Qatar)
• QATAR PETROLEUM
• SEG-QATAR
• SIEMENS
• SAIPEM
• TOTAL
• TAKREER
• TECHNIP
• UNION WATER AND ELECTRICITY COMPANY (UWEC)
• VAN OORD GULF FZE
• VEOLIA WATER
• ZADCO
• SABIC