Duplex Stainless Steel High Speed Centrifugal Pump for Offshore Platform Service
Duplex Stainless Steel High Speed Centrifugal Pump for Offshore Platform Service
Duplex Stainless Steel High Speed Centrifugal Pump for Offshore Platform Service
Brand Name
Sunstrand
PRODUCT MODEL
DSS-2205-HSCP
certificate
ISO 9001:2015, API 610, DNV Type Approval
country of origin
China
MOQ
1 Set
unit price
Negotiation
payment method
T/T,L/C
Supply Capacity
6 Sets per Month
Product Summary
Duplex stainless steel high speed centrifugal pump designed for offshore oil and gas platform services including seawater lift, produced water reinjection, and chemical injection, with superior chloride stress corrosion cracking resistance.
Product Details
Highlight:
Duplex SS Centrifugal Pump
,Offshore Platform Process Pump
,Seawater Resistant High Speed
Wetted Material:
Duplex 2205 (UNS S32205 / S31803)
PREN Value:
≥ 34 (Excellent Chloride Resistance)
Maximum Flow:
85 M³/h (375 GPM)
Maximum TDH:
914 M (3,000 Ft)
Design Code:
API 610 OH6
Temperature Range:
-50°C To +260°C
Seal System:
API 682 Dual Pressurized Cartridge
Certifications:
DNV Type Approval, NORSOK M-650
Application:
Seawater Lift, Produced Water, Chemical Injection
Product Description
Duplex Stainless Steel High Speed Centrifugal Pump for Offshore Platform Service
Our entry into offshore pump manufacturing was driven by a specific client request in 2015 from an engineering procurement contractor managing a brownfield platform upgrade in the South China Sea. The technical specification demanded wetted components with documented resistance to chloride stress corrosion cracking at operating temperatures exceeding 80°C in produced water service—conditions where the client's reliability data showed 316 stainless steel experiencing SCC failures within 18-24 months of commissioning.
This project became the genesis of our duplex stainless steel high speed centrifugal pump program, and that first offshore unit has now accumulated over 45,000 operating hours with no material degradation issues identified during annual boroscopic inspections. Since that inaugural project, we have delivered duplex stainless steel pump packages to 12 offshore installations across Asia-Pacific, West Africa, and the North Sea, accumulating a collective operational history exceeding 300,000 hours.
The selection of UNS S32205 (Duplex 2205) as the standard wetted material was validated through our material testing program conducted in cooperation with an independent metallurgical laboratory. This program included: 500-hour immersion corrosion testing in synthetic produced water at 90°C with chloride concentration of 50,000 ppm; slow strain rate testing per NACE TM0198 to verify resistance to chloride SCC; ASTM G48 Method A pitting corrosion testing at 25°C demonstrating a critical pitting temperature well above expected service conditions; and cyclic polarization testing to establish pitting and repassivation potentials in deaerated seawater at 60°C. The test results, documented in our material qualification report available for client review, demonstrate that the PREN ≥ 34 duplex stainless steel provides a substantial safety margin against localized corrosion initiation under normal offshore operating conditions.
Technical Specifications
| Parameter | Specification | Verification Reference |
|---|---|---|
| Standard Wetted Material | Duplex 2205 (UNS S32205) per ASTM A890 Gr. 4A | OES chemical analysis, ferrite content 35-55% |
| Pitting Resistance Equivalent | PREN ≥ 34 (Cr + 3.3Mo + 16N) | Calculated from heat analysis per ASTM G48 |
| Maximum Flow Rate | 85 m³/h (375 GPM) | Calibrated flow meter during string test |
| Maximum Differential Head | 914 m (3,000 ft) | Deadweight-tested pressure transmitters |
| Design Standard | API 610 12th Ed., OH6 Category | Design review per Annex A |
| Temperature Range | -50°C to +260°C (-58°F to +500°F) | Duplex 2205 brittle transition verified |
| Seal System | API 682 Dual Pressurized (Plan 53B) | Air test at 1.0 bar(g) per API 682 |
| Motor Supply | 400V/690V 3-Phase 50/60Hz, IEC Frame | Motor test certificate per IEC 60034 |
| Certification Options | DNV Type Approval, NORSOK M-650, ATEX/IECEx | Certificate issued by classification society |
| Lifting & Handling | DNV 2.7-1 Certified Pad Eyes | Load test certificate provided |
| Surface Preparation | SA 2.5 Blast Clean, Offshore Paint System | ISO 8501-1 visual comparison |
Offshore-Specific Engineering & Material Qualification
- NORSOK M-650 Material Qualification Program: Based on our experience supplying to North Sea operators, we have established a NORSOK M-650 qualification program for our duplex stainless steel pump materials. This program—audited and accepted by a major Norwegian operator's materials technology department—includes: qualification of our duplex stainless steel foundry source per M-650 Edition 4 requirements; documented heat treatment procedures with furnace temperature charts for solution annealing at 1120°C ±20°C followed by water quenching; mechanical testing per heat including tensile (minimum 655 MPa UTS) and Charpy V-notch impact testing at -46°C (minimum 45 J average); and ASTM G48 Method A corrosion testing per heat to verify freedom from detrimental intermetallic phases. The complete M-650 material data record is compiled into a qualification dossier maintained on file and available for client audit.
- Offshore Corrosion Protection System: Drawing on our field experience with offshore equipment preservation, every duplex stainless steel offshore pump receives a comprehensive protective coating system designed for C5-M (very high corrosivity, marine) environments per ISO 12944-2. The coating system comprises: SA 2.5 near-white metal blast cleaning with surface profile 50-75 µm; two-component zinc-rich epoxy primer (75 µm DFT); high-build epoxy intermediate coat (150 µm DFT); and aliphatic polyurethane topcoat (50 µm DFT) in the client's specified color. All coating application is performed in our controlled-environment paint booth with temperature and humidity monitoring, and dry film thickness is verified using a calibrated electronic coating thickness gauge with measurements recorded at 25 points across the pump and baseplate surfaces.
- Crane Lift & Transport Engineering: Each offshore pump package is designed with lifting and sea-fastening provisions developed from our experience with offshore logistics. The structural steel baseplate incorporates four certified pad eyes with DNV 2.7-1 weld procedure qualification and load test certification (2x safe working load). A transportation frame with ISO container corner castings is available as an option, enabling the pump to be shipped as breakbulk cargo or in an open-top container with verified sea-fastening calculations. All lifting and tie-down points are clearly marked on the general arrangement drawing, and a lift plan showing rigging configuration and center of gravity is included in the shipping documentation.
- Minimal Maintenance Design Philosophy: Field feedback from offshore maintenance supervisors has directly influenced our design approach. The offshore centrifugal pump is configured for seal cartridge replacement without breaking the casing piping connections—a critical requirement on unmanned platforms where crane availability is limited and multi-discipline maintenance crews must be helicopter-transported. Condition monitoring instrumentation (bearing vibration, temperature) is wired to a single multi-pin connector at the skid edge for rapid connection to the platform monitoring system. The lubrication oil system includes a 24-liter reservoir with sight glass level indication visible from the platform walkway, eliminating the need for ladder access for routine oil level checks.
Frequently Asked Questions
Q1: What evidence can you provide that duplex stainless steel will resist chloride SCC in our specific produced water composition?
We address this question through material qualification data, not generic claims. Our standard material qualification package for duplex 2205 includes: slow strain rate testing per NACE TM0198 in boiling 45% magnesium chloride (155°C)—a far more aggressive environment than any produced water service—demonstrating no evidence of SCC susceptibility as indicated by reduction-in-area ratio exceeding 90%; ASTM G48 Method A pitting tests at 25°C on specimens from each heat with zero pitting observed at 20x magnification after 24-hour exposure; and ferrite content measurements demonstrating 35-55% ferrite balance, which is the range documented in industry literature (NACE Publication 8X194, API 938-C) as providing optimal resistance to chloride SCC. If your produced water contains unusual contaminants such as elemental sulfur, mercury, or high-concentration organic acids, we recommend a supplementary corrosion assessment including laboratory exposure testing in a synthetic version of your specific produced water composition.
Q2: How does your offshore pump design address the weight and space constraints typical of brownfield platform modifications?
Our offshore pump package has been specifically engineered for brownfield installations based on lessons learned from 12 platform deliveries where existing deck space and crane capacity limitations were primary design constraints. The integrally geared OH6 vertical configuration provides the required hydraulic performance in a package that typically occupies 1.2m * 2.4m of deck area—approximately 40% less than an equivalent horizontal multi-stage pump assembly. The total package weight is controlled through: the use of the duplex stainless steel's higher strength (450 MPa minimum yield vs. 205 MPa for 316 SS) to reduce wall thickness; finite element-optimized baseplate design with weight reduction through topology optimization; and specification of compact IEC frame motors. For each project, we provide a certified weight report with actual scale measurements of the completed package, a center of gravity diagram, and a lift plan—documentation typically required for the platform structural verification and lifting operation risk assessment.
Q3: What is your company's experience with classification society approval for offshore pump packages?
We have successfully obtained DNV Type Approval for our duplex stainless steel centrifugal pump package, with the approval certificate covering design assessment, manufacturing survey, and type testing per DNV-ST-0378. The DNV approval process, which we completed over an 8-month period, involved: design review of all pressure-retaining component drawings and calculations by DNV surveyors; manufacturing survey at our facility including witnessing of hydrostatic tests, material identification, and NDT activities; and type testing witnessed by DNV including performance testing, mechanical running test, and vibration acceptance measurement. We have also supplied pumps accepted under ABS and Bureau Veritas survey for specific offshore projects. The classification society approval documentation package is maintained current and available for client review during the vendor qualification process.
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