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Оригинальные примечания на английском языке.
Source-specific specification: VMAN 2026 gas/methanol catalogue, HND CHG620/622 section, PDF p50 (printed p49): vman-engine.com · PDF .
Rated mechanical engine output 2100 kW at 1500 rpm; associated electrical output 2000 kWe is distinct.
Source does not establish PRP/ESP duty, so all prime/standby fields remain unset.
Natural-gas test basis includes methane >=95%; do not apply unchanged to low-calorific gases.
Bore/stroke 170/215 mm.
Oil capacity 330 L; cooling-water capacity 220 L; listed mass is dry engine weight.
These specifications are verified against the supplier-published table, not a newly obtained HND factory datasheet.
PDF p50 heading says CHG620V20, but its model row and adjacent section pages identify CHG622V20.
Header inconsistency flagged; no separate CHG620V20 created.
HND parent-group confirmation of engine identity/application: csic.com.cn · источник .
Current factory production status is unconfirmed.
Discontinued is the owner-approved catalogue classification for unknown production status, not a manufacturer-confirmed discontinuation.
Additional source-specific supplier specifications, VMAN 2026 catalogue PDF p51 (printed p50), visually verified: exhaust temperature <=580 C; separately listed maximum exhaust temperature 620 C; exhaust mass flow including H2O 9943 kg/h; exhaust pipe DN400; combustion-air mass flow 9578 kg/h.
Natural-gas requirements: CH4 >=80%, methane number >=80; gas valve-group inlet pressure 30-50 kPa; engine inlet gas pressure 6-10 kPa; heating-value change <=2%/min; H2S <=20 mg/Nm3; total sulfur <=200 mg/Nm3.
Lubricating-oil pressure >300 kPa at idle and 460-520 kPa at rated speed; maximum permissible oil temperature <=90 C.
The >=80% methane gas requirement is distinct from the >=95% methane performance-test basis and does not establish full rated power on all qualifying gases.
Exhaust-back-pressure conflict remains unresolved: this technical table lists maximum 2.5 kPa, while the overview test conditions state <5 kPa; no single installation limit is asserted.
Additional rating discrepancy flagged: PDF p52 (printed p51), headed CHG620V20, lists 2105 kW in its torsional-vibration table, versus 2100 kW in the CHG622V20 overview.
No rating change is made; the differently headed page is not used to add cooling specifications pending clarification.
