IGEM UP/1B Ed 4 – Tightness Test Calculator

Inputs

35mm copper length (m)

28mm copper length (m)

22mm copper length (m)

15mm copper length (m)

Meter type

This mirrors the Excel workbook’s logic: each pipe length is multiplied by a fixed factor, total IV is summed, purge volume is IV × 1.5, and permissible drop is determined from IV using a threshold table.

Results

Installation Volume (IV)

0.008 m³

Purge Volume

0.012 m³

Natural Gas permissible drop

4 mbar

Scope check

In scope (≤ 0.035 m³)

Breakdown (IV contributions)

Component	Input	IV (m³)
35mm copper	—	0
28mm copper	—	0
22mm copper	—	0
15mm copper	—	0
Meter volume	G4/U6	0.008

Safety note: this page mirrors the spreadsheet calculations only; always apply the official standard and site procedures.