Orifice Flow Calculator

The problem

Facility engineers need defensible orifice flow numbers for production allocation, custody transfer, and flowline sizing — and the math has to be reproducible if a partner audits the allocation statement. Vendor sizing tools live behind logins, hand calcs miss the Reynolds and density corrections, and a 2% allocation error on a 50 MMscf/d gathering system is $40K/month in mis-allocated revenue. When the JIB statement gets challenged, "I used a spreadsheet" is not a defense.

What you get

• →Solve any of Q, orifice diameter, or ΔP from the other two — one tool covers sizing, allocation, and verification.
• →ISO 5167 / AGA-3 discharge coefficient from your beta ratio, with the Reynolds check built in.
• →Density correction at flowing T and P — no more 1% drift from assuming standard conditions.
• →Downloadable workbook + plot you can attach to an allocation memo or custody-transfer file.
• →Multi-meter batch mode for screening a gathering system or LACT bank.

Who uses this

• →Facility engineers sizing meter runs for new gathering and processing systems.
• →Production accountants verifying allocation statements before the monthly JIB closes.
• →Operators auditing custody-transfer meters during contract renegotiation.

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