How to Manage Technical Deviations and NCRs in Tower Packing Procurement
Not every tower packing project proceeds exactly according to the original specification.
During manufacturing or inspection, a supplier may discover that:
- a dimension differs;
- a material document is incomplete;
- a product characteristic is outside tolerance;
- a requested construction cannot be manufactured exactly as drawn.
The wrong response is to hide the difference.
The correct response is to classify and resolve it before shipment.
Deviation and Nonconformance Are Not Identical
A technical deviation request generally asks for approval to depart from a specified requirement.
An NCR, or Non-Conformance Report, normally records that a requirement has not been met.
The project’s own QA terminology governs the final classification.
The essential principle is:
A supplier should not unilaterally redefine the customer’s specification after discovering a problem.
State the Requirement First
A useful deviation document begins with:
Specified requirement
For example:
Sheet thickness: 0.20 mm
Then state:
Actual or proposed condition
Actual measured thickness: 0.18 mm
Without both values, the purchaser cannot evaluate the issue objectively.
Explain the Technical Consequence
The supplier should address whether the difference affects:
- geometry;
- mechanical strength;
- weight;
- corrosion allowance;
- hydraulic behavior;
- installation;
- documentation.
Do not simply state:
No impact.
Explain why the impact is considered acceptable.
Offer a Corrective Option
Possible actions include:
- remake the affected product;
- sort the lot;
- perform additional inspection;
- submit the condition for technical acceptance;
- modify the drawing;
- replace the material.
The customer should be able to compare:
accepting the deviation
with
correcting the product.
Do Not Hide Commercial Pressure
A common bad practice is delaying disclosure because:
- shipment date is close;
- remanufacturing is expensive;
- freight has been booked.
These facts may affect schedule decisions, but they do not change the technical requirement.
Deviation approval should remain explicit.
One Accepted Deviation Does Not Rewrite the Whole Specification
If the customer accepts one specific condition for one production lot, that does not automatically mean:
- the specification is permanently changed;
- future lots can use the same deviation;
- another project accepts the same condition.
Scope the approval clearly.
Photographs and Measurements Help
For dimensional or workmanship issues, include:
- measured data;
- photographs;
- drawing references;
- inspection records.
A clear evidence package allows faster engineering review.
NCR Closure Should Be Traceable
If a nonconforming product is repaired or replaced, record:
- original issue;
- corrective action;
- reinspection result;
- final status.
The final quality dossier should not leave unresolved NCRs without disposition.
Minor Cosmetic Issues and Functional Deviations Are Different
A superficial mark may have no process consequence.
A change affecting:
- material grade;
- sheet thickness;
- packing geometry;
- element fit
may be much more significant.
Deviation review should therefore consider function, not appearance alone.
Do Not Use Deviation Approval to Replace Engineering Design
A supplier should not repeatedly propose major design changes through isolated deviations.
If the original technical basis needs substantial revision, issue:
- revised datasheet;
- revised drawing;
- revised technical agreement.
Document control should remain clear.
Engineering Takeaway
A good deviation process follows:
Requirement→ Actual Difference→ Technical Impact→ Proposed Disposition→ Customer Review→ Approval / Rejection→ Corrective Action→ Final Record
The objective is not to eliminate every deviation.
It is to ensure that no unapproved deviation reaches the installed tower.