These types of processes, more often than not, mean aggressive and super-aggressive operating conditions – high pressure and temperature that result in specific requirements for main process equipment.Since the cost of such equipment constitutes up to 40% of the total cost of the project, and the manufacturing time for some items can be over 20 months, the importance of the correct and timely placement of orders and proper quality control over the course of production is essential.
Role of independent quality control
Unfortunately, in some cases, customers underestimate the role of independent quality control during manufacturing. This oversight can lead to some risks and dangers such as deviation from the specifications in terms of dimensions; issues with the finished product characteristics; non-compliance with material and design specifications; incompleteness (constructive components, spare parts, final documentation, certificates, etc.) upon shipment; careless preparation for shipment (no flange plugs, violation, or absence of protective packaging, etc.); and the inability to ensure the normal operation of the equipment after installation.
A systematic and logical approach to the quality control of equipment manufacturing can significantly reduce these risks and their negative effect. A prime example is an EPC (engineering, procurement and construction) contractor’s typical approach to equipment manufacturing control. EPC contractors, who are financially responsible both for project budget and schedule, and for the quality of supplied equipment, fully control all stages of items manufacturing.
In this case, participation of the EPC contractor’s representatives starts with pre-inspection meeting organised by the supplier, and then finalised through the Inspection and Test Plan containing the full list of inspections, and also determined involvement of each controlling party in every inspection.
Degrees of criticality in equipment inspection
There are three main generally accepted degrees of criticality in equipment inspection: R (Review) – documentation control (certificates, test reports, etc.); W (Witness) – witnessing of tests conducted by the manufacturer’s personnel, in the case of unsatisfactory results of which production continues; and H (Hold) – witnessing of tests conducted by the manufacturer's personnel, in the case of unsatisfactory results of which production is suspended.
The degree of criticality for each party is different. For instance, for representatives of the supplier’s quality department, all inspections and tests are H-critical. Representatives of the EPC contractor also participate in all inspections specified in the Inspection and Test Plan for critical equipment, but H-criticality is assigned only for the most critical inspections, for example, hydraulic tests of tanks and vessels.
Representatives of the end-customer often take part only in the most critical inspections usually carried out at the end of the manufacturing cycle of a machine, or equipment, for example, running tests of the pump unit assembly. At these stages, the degree of criticality for the final customer is W, and in rare cases H. In all other inspections of the critical equipment supplied by the EPC contractor, the end-customer either does not fully participate, or only checks the test reports, which corresponds to the criticality R.
Robust and reliable approach to quality control
When it comes to refining and petrochemical complexes, the quality of all equipment, components, structures and materials is subject to many regulations and standards. Clearly defined and fully implemented quality assurance and quality control help ensure compliance with all contractual specifications, mandatory regulations and quality standards.
This is especially true with critical equipment in severe operating conditions. We have seen that these pieces of equipment make up a significant slice of the total cost of the project, and therefore it is essential to implement a robust and reliable approach to quality control through all stages of manufacturing and implementing. The overall success of the project may depend on it. This should be considered as a key component of project risk management.
For the latest refining and petrochemical industry related videos, subscribe to our YouTube page.