Chongqing, China · Marine
Chongqing Chuandong marine nitrogen project
The project record lists two STD1400/95 marine nitrogen units with a combined design capacity of 2,800 Nm³/h.
01 / CONTEXT
Project overview
The project record lists two STD1400/95 marine nitrogen units with a combined design capacity of 2,800 Nm³/h.
02 / PROBLEM
Operational challenge
Restricted vessel space, vibration, inclination, salt exposure and continuous duty require layout, maintenance access and class documentation to advance together.
Marine footprint, safety, vibration, continuous supply and class-rule compliance.
03 / ENGINEERING
Engineered solution
Two STD1400/95 units provide redundancy, with interfaces, vibration isolation, ventilation and safety interlocks engineered to the vessel and controlled project documents.
Engineering, manufacturing and acceptance documents follow vessel, class and project requirements.
04 / VALUE
Project value
The vessel receives continuous, switchable nitrogen capacity, reducing shore-supply dependence and improving autonomous support for inerting or process demand.
PROJECT RECORD
A project record from system configuration to operational handover.
The record follows three evidence lines: configuration, manufacturing and integration, then installation and commissioning. Images come from existing equipment, integration or commissioning records; text is tied to the confirmed location, industry, model and quantity.
Engineering record
System configuration and scope
The model, quantity and duty define the nitrogen unit, buffer storage, online analysis, controls and safety protection as one complete system.
Two STD1400/95 units provide redundancy, with interfaces, vibration isolation, ventilation and safety interlocks engineered to the vessel and controlled project documents.
Engineering record
Manufacturing, integration and factory checks
Assembly, piping, electrical inspection and system testing follow controlled drawings. Packing, lifting, logistics and interfaces are reviewed for remote projects.
Engineering, manufacturing and acceptance documents follow vessel, class and project requirements.
Engineering record
Commissioning and operational handover
Site work proceeds through hook-up, energisation, individual checks, integrated start-up, purity and flow verification, operator training and handover.
The vessel receives continuous, switchable nitrogen capacity, reducing shore-supply dependence and improving autonomous support for inerting or process demand.
PROJECT DELIVERY
From duty confirmation to stable production
Technical boundaries, delivery responsibilities and acceptance criteria are defined early to prevent interface rework on site.
- 01
Duty analysis
Confirm flow, purity, pressure, dew point, operating hours, peaks and current gas cost.
- 02
Engineering and tender
Define scope, select equipment, model energy use and support technical tender documents.
- 03
Detailed design
Confirm utilities, interfaces, controls, safety interlocks, civil works and piping.
- 04
Manufacturing and inspection
Build to controlled drawings and inspect key components, assembly, leakage, electrical and performance.
- 05
Logistics and installation
Coordinate packing, transport, lifting, piping, power and site readiness.
- 06
Commissioning and acceptance
Complete checks, integrated start-up, purity and flow verification, training and acceptance records.
- 07
Production and warranty
Track operating data and maintenance, with one-year contractual warranty and remote support.
ECONOMICS
Return-on-investment model
Model, quantity and design capacity come from the project record. The table uses only the provided RMB 0.35/m³ on-site cost and RMB 0.90–1.20/m³ delivered price to calculate an auditable annual cost spread.
| Delivered unit price | Annual delivered cost | Annual on-site cost | Annual cost spread |
|---|---|---|---|
| RMB 0.90 / m³ | RMB 11,466,000 | RMB 4,459,000 | RMB 7,007,000 |
| RMB 1.05 / m³Midpoint scenario | RMB 13,377,000 | RMB 4,459,000 | RMB 8,918,000 |
| RMB 1.20 / m³ | RMB 15,288,000 | RMB 4,459,000 | RMB 10,829,000 |
FORMULA
Full calculation
- Annual volume = design capacity × planned load × annual operating hours
- Annual delivered cost = annual volume × delivered nitrogen price
- Annual on-site cost = annual volume × RMB 0.35/m³
- Annual cost spread = delivered cost − on-site cost
- Annual net saving = cost spread − electricity adjustment − maintenance − finance and tax
- Simple payback = total tax-inclusive investment ÷ annual net saving; 5-year ROI = [5 × annual net saving − total investment] ÷ total investment × 100%
Contract value and actual customer gas bills are not public, so this page does not invent investment, payback or ROI. Provide total investment, local power price, operating hours and maintenance budget for a formal calculation.