The Industrial Vendor inspection or shop inspection article provides you with information about the second party and third party inspection process in the manufacturing shop. This content also provides lots of other articles for shop inspection practices for each equipment type.
Assume a chemical company order for the manufacturing of several compressors to a compressor vendor.
So there will be a proforma invoice (PI) and a purchase order (PO). The PI is issued by the compressor vendor with a detailed compressor specification and prices, and at the same time, a PO, will be issued by the chemical company which states their agreement with the specifications, and prices and ordering for the manufacturing of compressors.
PI and PO are important commercial documents.
Before the start of the manufacturing process, the chemical company will discuss and agree with the compressor manufacturer for inspection details. Normally, this process will be done through the inspection and test plan.
For more details, review the Inspection and Test Plan article.
In this important document, the inspection's “hold” and “witness” points will be determined and the compressor vendor will notify the oil company inspector for such inspections in advance.
Assume that the “inspection and test plan” determines 5 inspection points in the manufacturing process, such as material certificate review and identification, casing hydro-static testing, rotor balancing, performance test and run-out test.
So when the vendor reaches these points, it must notify the vendor inspector company (in advance) to attend the inspection and testing. Finally, if the result of the inspection visits were satisfactory, then the inspector will issue the inspection release note.
This chemical company has several options to designate an inspector as follows:
It might be that there is not a direct contract between the chemical company and the vendor, and the contract is between the oil company and the engineering company.
So the engineering company can make a contract with the compressor vendor, and then the engineering company is responsible for inspection. If the engineering company uses its own inspector, it will be similar to the second party inspector, and if they hire the inspection agency, it will be a third party inspector.
Please note that most of the clients such as this chemical company mandate the engineering companies to hire a third party inspection agency.
Using the “inspector” wording for the engineering company's personnel is not correct. They must be called a quality control engineer or technician, and similarly, their department is the quality control department, not the inspection department.
Inspector wording can be used only for someone who is the purchaser's employee or the purchaser's designated person working in the inspection agency.
When the inspection is carried out in the vendor shop, it is called a vendor inspection.
For more supplementary information on this subject, you may review the Vendor Inspection Services article.
You may review TPI Inspection Services page to submit your Vendor/Shop Inspection Enquiry.
For more detail about vendor inspections and referenced codes and standards, described separately for each equipment type, please see the following articles:
Vendor Inspection for Fix Equipment
Vendor Inspection for Rotary Equipment
Reciprocating Compressor, Centrifugal Pump, Gas Turbine, Steam Turbine, Fan and Blower, Centrifugal Compressor, Screw Compressor Testing, Centrifugal Pump Performance Test, Centrifugal Compressor Testing, Reciprocating Compressor Testing, Fan Mechanical Running test, Fan Performance Test
Vendor Inspection for Electrical Equipment
Third Party Inspection, Industrial Inspection, Pre-Shipment Inspection, Goods Inspection, Factory Acceptance Test, Goods Inspection Services, Commodity Inspection Services, Preshipment Inspection Services, 3rd Party Shop Inspection, Quality Control Plan, Quality Control Manual, Industrial Quality Control, Contractor Quality Control Plan, Quality Control Manual for Contractors, Quality Control Forms, Approved Vendor List