Pipe Schedule Quick Reference - Cached NPS 1/2" to 12" Rows

How It Works

1. Select Nominal Pipe Size

   Choose one of the cached NPS 1/2" through 12" rows. NPS is a designator, not the actual OD or ID, and current standards/project documents still control final dimensions.

2. Choose Implemented Schedule

   Select Schedule 10, 40, 80, or 160. Schedule 5, S-schedules, STD, XS, XXH, nonstandard wall, and NPS above 12 require direct source review outside this app.

3. Review Dimensional Data

   See cached OD, wall thickness, computed ID, computed flow area, and conventional steel weight per foot. Metric values are display conversions from the cached inch rows.

4. Resolve Source Gaps

   Verify ASME table row, pipe material, wall tolerance, corrosion/mechanical allowance, manufacturer data, pressure-temperature design code, fittings, flanges, inspection, and qualified piping review before use.

Built For

• Pipefitters and plumbers screening common cached dimensions before checking the project spec
• Mechanical teams comparing first-pass ID and wall prompts before pressure-design review
• Estimators using conventional weight prompts before supplier takeoff and procurement checks
• Maintenance teams recording UT follow-up items without treating the app as inspection acceptance
• Drafters and designers using cached NPS prompts before current table and product validation
• Inspectors flagging pipe-marking questions for the applicable standard and specification

Features & Capabilities

Limited Cached Row Set

Implements NPS 1/2" through 12" Schedule 10, 40, 80, and 160 rows only. Licensed ASME tables, stainless S-schedules, STD/XS/XXH, and specialty walls remain source gaps.

Inside Diameter & Flow Area

Computes inside diameter as OD minus two wall thicknesses and flow area as pi/4 times ID squared from the cached rows. These are screening values, not inspection or design approval.

Conventional Weight Prompt

Uses the common steel shortcut 10.69 x (OD - wall) x wall for lb/ft. Actual weight depends on material, tolerance, coatings, lining, corrosion allowance, scale, and supplier data.

Pressure Rating Gap

Does not calculate allowable pressure. Pressure-temperature suitability needs material allowable stress, minimum wall, corrosion allowance, joint efficiency, code edition, fittings, flanges, valves, and qualified review.

Source-Aware Export

Report and PDF output include the cached row, formulas, ASME/NIST source pointers, and the unresolved gaps that must be checked before field or engineering use.

Comparison

Assumptions

• Cached rows are limited to NPS 1/2 through 12 and Schedule 10, 40, 80, and 160.
• ID is computed as OD minus two wall thicknesses; area is computed as pi/4 times ID squared.
• Weight per foot uses the conventional carbon-steel shortcut 10.69 x (OD - wall) x wall.
• Metric values are display conversions from cached inch rows.

Limitations

• Does not reproduce or certify licensed ASME B36.10/B36.19 table rows.
• Does not include Schedule 5, 5S, 10S, 40S, 80S, STD, XS, XXH, NPS above 12, or non-standard wall thicknesses.
• Does not calculate pressure rating, code compliance, material suitability, corrosion allowance, or inspection acceptance.
• Does not validate pipe markings, mill certificates, product data, wall tolerance, coatings, linings, scale, corrosion, or field condition.
• Fittings, flanges, valves, branch connections, supports, and system weakest-component rating remain outside the app.

References

1. ASME B36.10M source pointer for welded and seamless wrought steel pipe dimensions.
2. ASME B36.19M source pointer for stainless pipe dimensions not implemented as local rows.
3. ASME B31.1/B31.3 source pointers for pressure-design context outside this app.
4. NIST SP 811 Appendix B.8 for unit conversion context.

Frequently Asked Questions