[Responsibilities and Qualifications] The installation contractor is required to secure an advance agreement that concerns all the installation details from the:

According to API Standard 936, the installation contractor holds the primary responsibility for the satisfactory installation of the refractory lining. This responsibility is defined by the owner's specifications and drawings. To ensure alignment and prevent disputes, the standard explicitly mandates that the contractor must obtain an "advance agreement" from the owner that covers all details of the installation process. This agreement forms the contractual basis for the work and the benchmark against which the inspector will verify compliance. The owner is the ultimate client and authority for the project.

A. Engineering company: The engineering company typically provides the design and specifications, but the contractual agreement for execution is between the contractor and the owner.
B. Inspector: The inspector's role is to verify that the installation conforms to the pre-agreed details, not to establish or approve those details.
D. Manufacturer: The manufacturer provides the refractory materials and application procedures, but they are not the party with whom the contractor finalizes the overall installation agreement.

1. API Standard 936

Refractory Installation Quality Control—Inspection and Testing Monolithic Refractory Linings and Materials

4th Edition

December 2014.

Section 6.1.1: "The contractor shall secure advance agreement from the owner concerning all installation details."

Section 4.2.1: "The contractor shall be responsible for the satisfactory installation of the refractory in accordance with the requirements of the owner’s specification and drawings."