Custody-Transfer Metering Stations in Alberta: ABSA Piping Registration and Drawing Packages

By Kopfkino Consulting Corp. · Published September 14, 2026 · Updated October 17, 2026 · 7 min read

ABSA registers custody-transfer metering station piping through an AB-96 application with P&IDs, line lists, GA drawings, fitting CRNs and Alberta P.Eng. authentication. What the package needs.

For metering station piping registration, ABSA requires an AB-96 application with P&IDs, a complete line list, GA/isometric drawings, a BOM citing fitting CRNs, a pressure relief device list, and stress analysis where applicable, sealed by an Alberta P.Eng.

Custody-transfer metering stations sit at an awkward regulatory seam: pipeline-regulated CSA Z662 piping on one side, facility pressure piping under CSA B51 on the other, and vessels, fittings, and instruments in between. EPCs and packagers routinely discover late that Alberta's Pressure Equipment Safety Regulation (PESR, AR 49/2006) requires ABSA design registration for the station piping before fabrication, and that an incomplete AB-96 package is the biggest schedule risk.

Where Alberta law hooks a metering station

Alberta's Safety Codes Act and the Pressure Equipment Safety Regulation (AR 49/2006) govern pressure piping design registration (administered by ABSA under the Boilers Delegated Administration Regulation, AR 32/2002). Three hooks matter:

  • Out-of-province fabrication. All pressure piping fabricated outside Alberta must be registered regardless of volume, a skid built in Texas, Korea, or Ontario needs an AB-96 even at trivial internal volume.
  • The 0.5 m³ system-aggregation threshold. PESR s. 14(6)(a) exempts an in-province piping system with aggregate internal volume ≤ 500 L, system volume, not per-skid volume. Splitting a station into sub-500 L skids to evade registration is explicitly not permitted; registered components (vessels, fittings, PRDs) are still required even where the piping design is exempt.
  • Small-assembly path. A compact instrument/metering assembly meeting CSA B51 Table 1 Note 2(b) (no component over 152 mm, total volume ≤ 42.5 L) may register as a single Category H fitting, useful for small prover or sample packages.

Alberta also has no categorical fitting exemptions: Category A, B, C, and G fittings exempt in BC, Saskatchewan, or Manitoba still need Alberta-accepted CRNs ("2" or "C" after the decimal).

The Z662/B51 boundary: what ABSA registers and what it does not

Pipeline-regulated piping (Alberta's Pipeline Act / AER oversight) is excluded from provincial BPV registration (PEEO s. 2(1)(e)): but boilers, pressure vessels, and pressure plants inside pipeline installations remain BPV-jurisdictional. In practice, the Z662/B51 boundary is drawn at the first and last station block valves (the delineation referenced in AER Directive 077; confirm the current treatment with the AHJ). Everything between those valves (vessels, meter runs, prover connections, station piping, fittings, pressure relief devices) is ABSA's design-registration scope.

The AB-96 drawing package: what ABSA expects

The piping design registration application is ABSA Form AB-96 (P.Eng.-authenticated). The supporting package (aligned with the general line-list and drawing content pressure-piping regulators require) includes:

  • P&IDs covering all pressure-retaining equipment and piping, with the Z662/B51 boundary clearly identified, PRD locations and settings, and registered-component callouts.
  • Line list: the review core. For every line: NPS/size, material specification, schedule/wall thickness, maximum design pressure and temperature, MDMT (minimum design metal temperature), corrosion allowance, radiography (RT) extent, test medium and pressure, and PWHT.
  • GA and piping isometric drawings sufficient to verify routing, flexibility, nozzle loads, and code of construction and edition (ASME B31.3 is the norm).
  • Bill of materials listing every pressure-boundary component with its fitting CRN (or documented exemption path). Reviewers cross-check that valves (C), flanges (B), strainers/filters/separators treated as fittings (E), and instruments (F) carry valid, non-expired CRNs, fitting CRNs expire 10 years after first acceptance.
  • Pressure relief device (PRD) list with set pressures, capacities, and relieving scenarios (API 520/521 basis); Alberta also recognizes overpressure protection by system design (ABSA AB-525, OPPSD) where applicable.
  • Stress/flexibility analysis where applicable: high-temperature service, large-bore runs, rotating-equipment nozzle connections, or any configuration the reviewer questions.
  • Vessel registrations for separators, filter vessels, and prover sumps (registered separately under AB-31, but referenced in the piping package).

P.Eng. authentication: what the rules actually say

ABSA's boiler/pressure-vessel new-design page states drawings need not be stamped by a Professional Engineer unless the code or the Safety Codes Officer requires it, no blanket P.Eng. authentication requirement for BPV drawings. For pressure piping designs, APEGA's guidance on how APEGA and ABSA legislation interact states that designs submitted to ABSA do require authentication by an Alberta Professional Engineer, including fabrication drawings and design calculations. Budget for an Alberta P.Eng. (APEGA member) to seal the AB-96 package.

Submission mechanics and fees

Submissions go through the ABSA CRN Portal (apps.crnonline.ca). Design survey work is billed hourly under the Schedule of Fees for Delegated Functions (Schedule A): as of the November 1, 2025 schedule, the general hourly rate is $163.50/hr ($81.75 per additional half hour); priority service (survey within two weeks) adds 30% with a $490.50 minimum; design revisions bill at a $137.70 minimum. Fitting registrations for station components are $163.50 per size, type, and pressure. Fees change on ABSA's schedule: confirm current amounts before budgeting.

Worked scenario: a bi-directional custody-transfer station

An EPC delivers a two-stream custody-transfer station for an Alberta gas plant: a 24-in separator/filter vessel, two parallel 8-in meter runs, and a common prover connection between the first and last station block valves. Skids are fabricated in Oklahoma; the vessel in Ontario.

  • The Ontario-built separator needs an ASME VIII design registered with ABSA (Form AB-31, National Registration path). Alberta is not an RCT reconciliation party, so the Ontario CRN does not carry over.
  • The US-fabricated piping triggers mandatory ABSA registration regardless of volume (out-of-province rule); even built in Alberta, the aggregate system volume would be assessed as one system.
  • The AB-96 package: P&IDs, full line list (MDMT critical for Alberta winter design), isometrics, BOM with CRNs for every valve, flange, strainer, and instrument, PRD list, B31.3 flexibility analysis, is sealed by an Alberta P.Eng. and filed through the CRN Portal.
  • Shop inspection of the US fabrication goes through an ABSA-accepted inspection agency engaged before fabrication starts; AB-83 owner records (retained ≥ 5 years) and the AB-81 completion report close the file.

Common ABSA review comments on metering station packages

  • Z662/B51 boundary not drawn on the P&IDs: show where pipeline-regulated piping ends and station piping begins.
  • Fitting CRN problems, missing or expired CRNs, numbers lacking the Alberta "2"/"C" designator (no A/B/C/G exemptions in Alberta), and overlooked Category H items (condensate pots, sample bottles, filter housings).
  • Line list gaps: blank MDMT, corrosion allowance, RT, test, or PWHT columns; wrong or unstated code edition.
  • Volume-splitting: skids presented as separate sub-500 L systems to avoid registration.
  • P.Eng. authentication missing, or late engagement of the ABSA-accepted inspection agency for out-of-country fabrication.

Best practices

These are engineering recommendations (not regulatory requirements) unless tied to a cited provision:

  • Freeze the Z662/B51 boundary first and state it on the P&ID; scope every registration against it.
  • Build the BOM from the CRN side: specify only fittings with valid Alberta-accepted CRNs, and verify 10-year expiry dates at procurement.
  • Aggregate volumes honestly across all skids and interconnecting piping (PESR s. 14(6)(a)).
  • Engage the Alberta P.Eng. and the ABSA-accepted inspection agency early (before out-of-province fabrication), and run the vessel (AB-31) and piping (AB-96) registrations in parallel.

Frequently Asked Questions

Does my metering station piping need ABSA registration if it is fabricated outside Alberta?

Yes: regardless of volume. Only in-province piping at aggregate system volume ≤ 0.5 m³ is exempt (PESR s. 14(6)(a)).

Can I split my metering station into small skids to stay under the 0.5 m³ threshold?

No. The exemption applies to aggregate system volume; splitting into sub-500 L skids is explicitly not permitted, and registered components (vessels, fittings, PRDs) are required regardless.

Do I need an Alberta P.Eng. to seal the piping design?

Yes for piping: APEGA guidance requires authentication by an Alberta Professional Engineer. BPV drawings carry no blanket P.Eng. authentication requirement unless the code or a Safety Codes Officer requires it.

How much does ABSA charge for a piping design review?

As of November 1, 2025: design surveys $163.50 per hour; priority (two-week) service +30% with a $490.50 minimum; fitting registrations $163.50 per size, type, and pressure. Confirm current fees with ABSA.

Do the fittings in my metering station need CRNs even if they are standard ASME B16 components?

Yes: Alberta has no categorical exemption for Category A, B, C, or G fittings; each needs an Alberta-accepted CRN ("2" or "C" after the decimal) within its 10-year expiry.

Key Takeaways

  • Metering station piping in Alberta is registered via ABSA Form AB-96 through the CRN Portal: P&IDs, line list, GA/isometrics, BOM with fitting CRNs, PRD list, and stress analysis where applicable.
  • All out-of-province-fabricated piping must be registered regardless of volume; the 0.5 m³ exemption is system-aggregate with a no-splitting rule (PESR s. 14(6)(a)).
  • The Z662/B51 boundary is drawn at the first and last station valves; everything between them is ABSA scope.
  • Piping designs require Alberta P.Eng. authentication per APEGA guidance; BPV drawings carry no blanket stamp requirement.
  • Alberta has no A/B/C/G fitting exemptions and is not an RCT reconciliation party; a separate ABSA review is always required.
  • Budget ABSA hourly review fees ($163.50/hr as of November 1, 2025); engage the inspection agency before out-of-country fabrication.

Related Guides

Sources

Assembling an AB-96 package that survives ABSA review without comment cycles takes experience with both the technical content and Alberta's specific practices. Kopfkino Consulting supports EPCs and metering packagers with CRN applicability assessments, registration strategy across ABSA's piping, vessel, and fitting streams, design review before fabrication, design and stress calculations, complete submission-package preparation (P&IDs, line lists, BOMs with verified fitting CRNs), Alberta P.Eng. coordination, multi-province registration planning, resolution of regulator review comments, and dedicated support for international OEMs fabricating metering stations for Alberta sites. Contact us to discuss your station scope and submission timeline.

Topics: CRN Registration, Alberta, ABSA, Metering Stations, Piping Registration

Need Help With CRN Registration?

Kopfkino Consulting provides end-to-end CRN registration services across all 13 Canadian provinces and territories. Phone: 647-458-5536 | Email: info@kopfkino.ca

Request a Quote