Approved Supplier Process

Matrix NAC utilizes an Approved Supplier/Vendor List (AVL) process for material suppliers and subcontractors.  In order to be placed on the AVL, suppliers and subcontractors are required to complete the following:

Major Material/Fabrication Suppliers:

  • Submittal and approval by Matrix NAC of a completed Supplier Prequalification Questionnaire.
  • Third Party Accreditation (ASME, ISO, AISI, SISAP) based on receipt of accreditation certificate and registrar listings.
  • Acceptable shop survey by way of on-site assessment of supplier’s capabilities.



  • As a union construction company to the North American energy, power and industrial markets, Matrix NAC requires our subcontractors to be union subcontractors in accordance with collective bargaining requirements.
  • Due to the complexity and risk associated with the work performed by its Subcontractors, Matrix NAC follows a rigorous process to admit Subcontractors to the Approved Supplier (Vendor) List:
    • Subcontractor’s that fall into the Tier I Medium/High Risk exposure category (see chart below) are required to complete their prequalification process through ISNetworld. Matrix NAC requires an A or B rating in accordance with our ISNetworld requirements.
    • If the Subcontractor falls into the Tier II Low Risk exposure category, inclusion in ISNetworld is not mandatory, but the Subcontractor must complete a manual prequalification process to be reviewed by Procurement and other departments as needed.


Matrix Subcontractor Risk Exposure Criteria
High Risk

ISNetworld subscription required

Work, activity or service that:
Examples in this category include, but aren’t limited to:
  • Has a high potential for causing catastrophic operational incident.
  • Is performed on-site or is off-site where client has responsibility and is liable for work performed.
  • May impact a process or site operations.
  • Requires confined space entry, elevated work, work on operating systems involving hazardous energy, and most work requiring a general work permit, hot work permit, or confined space permit.
  • Has access to operations and/or a direct role in site operations or maintenance, where failure could result in serious harm to employee or public well-being, company assets or the environment.
  • Any contractor personnel’s job function which has no direct or very limited supervision for operational checks.
  • Chemical and process cleaning
  • Electricians and instrumentation technicians
  • Environmental investigation, remediation, monitoring activities
  • Equipment and process maintenance and/or inspection
  • Excavation
  • Facilities Maintenance (HVAC, roofing, etc)
  • NDT Testing
  • Hazardous waste handling and/or transport
  • Heavy Equipment Operations
  • Maintenance, construction and demolition contractors
  • On-site sampling/gauging activities
  • Painters
  • Welding
Low Risk

ISNetworld subscription not required

Work that does not meet the definition of high risk exposure includes, but isn’t limited to:
Examples in this category include, but aren’t limited to:
  • Consultants that do not perform work or activities as described in the high risk exposure category
  • Off-site services
  • Minor on-call, on-site vendor pick-up/delivery and repair services
  • Work performed by public or private utilities
  • On-site with visitor status (escorted)
  • Work having an indirect role and limited access to operations or maintenance, where failure could no result in serious harm to employee or public well-being, company assets or the environment
  • Auditors
  • Janitorial services and sanitary waste removal services
  • Waste pick up and recycling pick up
  • Vendors that stage and leave trucks/trailers on client sites
  • Carriers/transportation companies inventory management services (Grainger, Motion Ind.)
  • Delivery/supply services (vending machine, bottled water, laundry)
  • Laboratory apparatus servicing
  • Mail/package/parts delivery or pick up (UPS, FedEx)
  • Municipal waste pick up
  • Office support and repairs (computers, printers)
  • Offsite repair/fabrication shops
  • Landscaping services
  • Regulatory representatives
  • Sample pick up by laboratory/courier
  • Technical representation • Telephone, local municipal utilities
  • Training services
  • Food service and handling
  • Engineering services