For many years, GTT has developed an active policy to provide technical assistance all over the world for the maintenance and repair of membrane containment systems through specific agreements for repair shipyards and repair works subcontractors. The GTT approved partners are:

Country Approved Repair Yards Approved repair works subcontractors
China (P.R.) ▪ Yiu Lian Dockyards (Shekou)
▪ Huarun Dadong Dockyard Co.,Ltd (HRDD)                     
▪ Guangzhou Wenchong Dockyard Co., Ltd (GWD)
▪ Cosco Shipping Heavy Industry (Zhoushan) Co., Ltd                         
▪ COSCO Shipping Heavy Industry (Shanghai) Co., Ltd
▪ Zhoushan Xinya Shipyard
 
Denmark ▪ Fayard A/S  
France ▪ Damen Brest ▪ Marchani
Germany   ▪ Turbo Technik
Indonesia ▪ PaxOcean  
Japan ▪ Mitsubishi H. I. Yokohama  
Korea   ▪ DSEC T&S
Malaysia ▪ Malaysia Marine and Heavy Engineering  
Oman ▪ Oman Drydock Company  
Philippines ▪ Keppel Subic Shipyard  
Portugal ▪ Lisnave  
Qatar ▪ Nakilat Keppel Offshore Marine (NKOM)  
Singapore ▪ Sembcorp Marine Integrated Yard (Admiralty Yard)
▪ Sembcorp Marine MegaYard (Tuas Boulevard Yard)
▪ Keppel Benoi Shipyard
▪ Keppel Tuas Shipyard                                 
 
Spain ▪ Navantia Ferrol
▪ Navantia Cadiz
▪ Gabadi
Turkey  ▪ Besiktas Shipyard                                          ▪ Kuzey Star Shipyard   
United Arab Emirates ▪ Dubaï DryDocks World