services : visual inspection

Visual inspection is a key element of our sucker rod inspection program at Permian Rod Operations. We rely heavily on visual inspection to identify and evaluate rejectable conditions during preliminary inspections in the receiving area, investigate and prove-up flaws detected by electromagnetic inspection, and verify product condition during final inspection.

All product is thoroughly cleaned prior to inspection to remove any foreign material that may hinder the inspection process. Threaded areas are cleaned with solvent bath and rotary wire brush assemblies.

Adequate lighting is provided during all phases of the visual inspection process. Light intensity levels are monitored and verified regularly with a certified light meter to ensure that the appropriate lighting requirements are met.

Extreme care is exercised throughout all phases of the cleaning and visual inspection process to prevent handling damage.

The magnitude of imperfections detected during visual inspection is evaluated using such instruments as depth gages, micrometers, dial calipers, and gap gages.

Rods are checked for straightness by rolling 360 degrees on adequately spaced rack supports. Bending is further investigated with a total indicated runout (TIR) gage which indicates the precise degree of measured bend which is then compared to the acceptable tolerance limits of the applicable specifications.

Stretching, or out of tolerance length, is detected by a go/not go length measurement configuration which has been incorporated into our shot-blaster entry rack. Actual length measurements are taken and compared to allowable values, and rods culled by the rack device are classified accordingly.

Rod body diameter is checked at five foot intervals throughout the entire length. Calibrated dial calipers and gap gages are utilized for this inspection, which confirms dimensional compliance on new rods and detects wear and abrasion on used rods.

Rods and couplings are visually inspected for evidence of corrosion, handling and mechanical damage such as tool cuts, elevator peels, twisted wrench flats, hammer marks, etc. and classified accordingly. Areas with mechanical damage are scrutinized during EMI inspection for detection of hardness variations and fatigue cracking.

Rod grade is verified by interpreting the wrench flat codes and are color coded and segregated according to grade prior to EMI inspection.

Rod threads are visually examined by slowly rolling individual lengths and inspecting for imperfections. Immediately upon identification, all injurious imperfections are marked and categorized. The stress relief undercut area on new rods is checked with a micro-finish comparator. Surface finish tolerances are taken from API Spec. 11B.

Pin shoulders, wrench squares, and upsets are inspected for corrosion, mechanical damage, and diameter tolerance. Contact faces of pin shoulders and couplings are checked for parallelism.

9009 N. County Rd. West • Odessa, TX 79764 • Tel: (432) 367-4149 • Fax: (432) 367-7015
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