Scope
This inspection program covers the normal fabrication operations of Aboveground and Underground Storage Tanks.
Shell
Proprety
Frequency
Responsibility
Test Method
1.
Mandrel OD
One per machine set-up
Q.C. Inspector
QW 12
2.
Wall thickness
- Minimum average
- Any 2 adjacent points
- Minimum single point
Q.C. Machine
Inspector
Micrometer
3.
Length
Each Shell
Tape
4.
Loss on Ignition
Once per day
Q.C. Lab Insp.
QW04
5.
Barcol Hardness
ASTM D-2583
QW13
6.
Axial Flexural Strength and Modulus
Once per day's production
Q.C. Mechanical
Properties Insp.
QW 16
RIB
Property
Rib spacing
Audit on each shell
Rib stiffness and moment.
One per month production
Q.C. Mechanical Properties Inspector
QW17
Rib Crown Ends
-ditto-
Q.C. Mechanical Properties Inspector or Q.C. Lab Inspector
Endcap
Thickness
Each endcap.
Q.C. fitting Insp.
QW 18
Visual
Visual.
Assembly
Fitting alignment and position
Each endcap
Q.C. Fitting
Tape level bar
% Of grinding for endcaps and shell and cleanliness of lay-up areas.
Each grinded area
Overall length
Each Tank
Final Inspection
Stability & tightness
Q.C. Fittings Inspector
Pressure & Vacuum test
Marking
Visually
