Your subcontractors are your liability. Schedule G explicitly states that prime contractors must impose the exact same SHE requirements on all subs. Require your subs to sign a "Schedule G Acknowledgment" form. If a welder from a small sub falls 20 feet, you pay the $50k fine.
Many vendors assume standard industrial materials only need a generic CoC. Aramco requires Material Test Certificates (MTC) as per EN 10204 3.1 or 3.2 for almost all Schedule G metallic items. Ensure your mill certificates are traceable to the heat number. saudi aramco schedule g
Do not wait for an Aramco tender. Pre-screen subcontractors for: Your subcontractors are your liability
You cannot simply read Schedule G. You have to buy or access the referenced standards. For example: saudi aramco schedule g