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Valves for Desalination & High-Purity Water - Nghi Son

Nghi Son in Thanh Hoa province hosts the Nghi Son Refinery and Petrochemical (NSRP) complex, a ~200,000 bpd refinery with aromatics, polypropylene, and benzene units and one of Vietnam's largest FDI projects, served by a deep-water crude jetty and the surrounding Nghi Son Economic Zone; refining, aromatics, and polypropylene service drives demand for API 6D ball and gate valves in A216 WCB and alloy grades for crude, reformer, and hydrocracker units, NACE MR0175 sour-service valves for sulphur and crude streams, high-temperature globe and check valves for furnace loops, control valves for distillation and cracking, and API 526 relief valves; ASME B16.34, API 600/602, and international EPC standards apply with full traceability and PMI; Vajra Industrial Solutions supplies Nghi Son refinery, petrochemical, and Vietnamese EPC contractors with refinery-grade valve packages and Southeast Asia logistics.

Duplex stainless and SS 316 butterfly valves, ball valves, check valves, and diaphragm valves for SWRO, BWRO, MSF, and MED desalination plants and industrial high-purity water systems.

ASME B16.34ISO 9001:2015AWWA C504 (Butterfly valves for water)AWWA C516 (Large diameter rubber-seated butterfly valves)NSF 61 / NSF 372 (Drinking water materials)
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API 6D Certified
ASME B16.34
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Desalination & High-Purity Water Valves - Available in Nghi Son

Butterfly Valve (Duplex / Super Duplex)

PN 10 / PN 16 / Class 150

Seawater intake, brine reject, and concentrate disposal lines - high-chloride environment requires duplex minimum

Materials: Duplex UNS S31803 body and disc, or Super Duplex UNS S32750 for high-temperature or severe service, EPDM seat  ·  Standards: AWWA C504, EN 593, ISO 9001
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High-Pressure Ball Valve (SWRO Membrane Train)

Class 300 / 600

RO membrane train isolation and pressure control at 55–80 bar seawater service - SS 316 or duplex required

Materials: SS 316 (A351 CF8M) or Duplex F51 body and trim, PTFE seats  ·  Standards: ASME B16.34, API 608, ISO 9001
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Check Valve (Pump Discharge, Duplex)

PN 10 / PN 16 / Class 150 / 300

Seawater lift pump and high-pressure pump discharge non-return protection in SWRO and MSF plants

Materials: Duplex UNS S31803 or SS 316, EPDM or PTFE seat  ·  Standards: ASME B16.34, EN 12334, API 594
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Diaphragm Valve (Chemical Dosing & Permeate)

PN 10 / PN 16

Chemical dosing (antiscalant, chlorine, coagulant) and permeate quality control - zero leakage, non-contaminating

Materials: SS 316L or PVDF body, EPDM or PTFE diaphragm, NSF 61 approved elastomers  ·  Standards: ASME B16.34, NSF 61, EN 13397
View Diaphragm Valve (Chemical Dosing & Permeate) options for Nghi Son →

Desalination & High-Purity Water Industry in Nghi Son

Nghi Son in Thanh Hoa province hosts the Nghi Son Refinery and Petrochemical (NSRP) complex, a ~200,000 bpd refinery with aromatics, polypropylene, and benzene units and one of Vietnam's largest FDI projects, served by a deep-water crude jetty and the surrounding Nghi Son Economic Zone; refining, aromatics, and polypropylene service drives demand for API 6D ball and gate valves in A216 WCB and alloy grades for crude, reformer, and hydrocracker units, NACE MR0175 sour-service valves for sulphur and crude streams, high-temperature globe and check valves for furnace loops, control valves for distillation and cracking, and API 526 relief valves; ASME B16.34, API 600/602, and international EPC standards apply with full traceability and PMI; Vajra Industrial Solutions supplies Nghi Son refinery, petrochemical, and Vietnamese EPC contractors with refinery-grade valve packages and Southeast Asia logistics.

Oil RefiningPetrochemicalAromatics & PolypropyleneDeep-Water PortPower Generation

Critical Valve Requirements

Duplex (UNS S31803) or Super Duplex (UNS S32750) for all seawater-wetted valve components - PREN ≥35 minimum
NSF 61 / NSF 372 compliance for all materials in contact with potable water (permeate side)
High-pressure rating (Class 300–600) for SWRO membrane inlet and inter-stage boost pumping
Oxygen-compatible materials for media containing dissolved oxygen (DO) - relevant for permeate remineralisation and aeration
AWWA C504/C516 compliance for large-diameter butterfly valves (DN 200–DN 2400) on intake and discharge
Actuation for automated operation - SWRO plants require pneumatic or electric actuators for rapid membrane protection on pump trip

Why Nghi Son's Oil Refining Sector Needs Desalination & High-Purity Water Valves

Nghi Son in Thanh Hoa province hosts the Nghi Son Refinery and Petrochemical (NSRP) complex, a ~200,000 bpd refinery with aromatics, polypropylene, and benzene units and one of Vietnam's largest FDI projects, served by a deep-water crude jetty and the surrounding Nghi Son Economic Zone; refining, aromatics, and polypropylene service drives demand for API 6D ball and gate valves in A216 WCB and alloy grades for crude, reformer, and hydrocracker units, NACE MR0175 sour-service valves for sulphur and crude streams, high-temperature globe and check valves for furnace loops, control valves for distillation and cracking, and API 526 relief valves; ASME B16.34, API 600/602, and international EPC standards apply with full traceability and PMI; Vajra Industrial Solutions supplies Nghi Son refinery, petrochemical, and Vietnamese EPC contractors with refinery-grade valve packages and Southeast Asia logistics. Key facilities in the Nghi Son area - including Nghi Son Refinery & Petrochemical (NSRP), Nghi Son Economic Zone, Nghi Son deep-water port - rely on Butterfly Valve (Duplex / Super Duplex) for their oil refining operations. Vajra Industrial Solutions supplies Butterfly Valve (Duplex / Super Duplex), High-Pressure Ball Valve (SWRO Membrane Train), Check Valve (Pump Discharge, Duplex), Diaphragm Valve (Chemical Dosing & Permeate) for desalination & high-purity water projects across Thanh Hoa, with full ASME B16.34 and ISO 9001:2015 compliance documentation - EN 10204 3.1 material test certificates, API 598 pressure test reports, and third-party inspection co-ordination available for every order.

Delivery to Nghi Son

Vajra Industrial Solutions offers export documentation and delivery to Nghi Son in 7–14 business days. Emergency dispatch available for plant shutdowns and critical site requirements.

Also serving: Nghi Son Refinery & Petrochemical (NSRP), Nghi Son Economic Zone, Nghi Son deep-water port, Thanh Hoa industrial corridor

FAQ - Desalination & High-Purity Water Valves in Nghi Son

Do you supply desalination & high-purity water valves in Nghi Son?
Yes. Vajra Industrial Solutions supplies Butterfly Valve (Duplex / Super Duplex), High-Pressure Ball Valve (SWRO Membrane Train), Check Valve (Pump Discharge, Duplex), Diaphragm Valve (Chemical Dosing & Permeate) for desalination & high-purity water applications in Nghi Son, Thanh Hoa. Nghi Son in Thanh Hoa province hosts the Nghi Son Refinery and Petrochemical (NSRP) complex, a ~200,000 bpd refinery with aromatics, polypropylene, and benzene units and one of Vietnam's largest FDI projects, served by a deep-water crude jetty and the surrounding Nghi Son Economic Zone; refining, aromatics, and polypropylene service drives demand for API 6D ball and gate valves in A216 WCB and alloy grades for crude, reformer, and hydrocracker units, NACE MR0175 sour-service valves for sulphur and crude streams, high-temperature globe and check valves for furnace loops, control valves for distillation and cracking, and API 526 relief valves; ASME B16.34, API 600/602, and international EPC standards apply with full traceability and PMI; Vajra Industrial Solutions supplies Nghi Son refinery, petrochemical, and Vietnamese EPC contractors with refinery-grade valve packages and Southeast Asia logistics. We offer export documentation and delivery to Nghi Son in 7–14 business days with full documentation and third-party inspection.
What certifications are required for desalination & high-purity water valves in Nghi Son?
For desalination & high-purity water in Nghi Son, the applicable standards are: ASME B16.34, ISO 9001:2015, AWWA C504 (Butterfly valves for water), AWWA C516 (Large diameter rubber-seated butterfly valves), NSF 61 / NSF 372 (Drinking water materials), EN 593 (Butterfly valves), NACE MR0175 (Sour service - for associated oil & gas desal). All valves are supplied with full documentation including material test reports (EN 10204 3.1/3.2), pressure test certificates, and dimensional inspection reports. Third-party inspection (TPI) by EIL, Bureau Veritas, Lloyd's Register, or the client's nominated inspector can be arranged.
What is the delivery time for desalination & high-purity water valves to Nghi Son?
Standard stock sizes: export documentation and delivery to Nghi Son in 7–14 business days. Custom sizes and special materials (Duplex, Hastelloy, P91): 4–8 weeks manufacturing lead time. Express dispatch available for urgent site requirements. Contact us at +91-9979774557 or sales@vajravyuh.com with your specification and required delivery date.
What valve materials are required for seawater reverse osmosis (SWRO) plants?
SWRO plants require careful material selection due to seawater's high chloride content (28,000–38,000 ppm Cl⁻ in typical seawater). For seawater-wetted components: Duplex stainless UNS S31803 (PREN ~35) is the standard minimum for body, disc, and trim; Super Duplex UNS S32750 (PREN ~42) is preferred for warm seawater (above 30°C) and brine concentrate. SS 316 (PREN ~25) is insufficient for long-term seawater service and will develop pitting corrosion. On the permeate side (pure water): SS 316L is suitable, or PVDF/CPVC thermoplastics for aggressive pure water service.
What pressure class is required for SWRO membrane train valves?
SWRO (Seawater Reverse Osmosis) systems typically operate at 55–80 bar feed pressure (depending on seawater salinity and temperature). This corresponds to ASME Class 300 (approximately 51 bar at ambient temperature in SS 316) to Class 600 (approximately 103 bar). Most SWRO designers specify Class 600 rated valves (in SS 316 or Duplex) for membrane train isolation to provide an adequate safety margin above the 80 bar maximum operating pressure. High-pressure booster pump stages may require Class 900 in some ultra-high recovery designs.

Other Application Guides for Nghi Son

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Desalination & High-Purity Water Valves - Nghi Son

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Standards

ASME B16.34
ISO 9001:2015
AWWA C504 (Butterfly valves for water)
AWWA C516 (Large diameter rubber-seated butterfly valves)
NSF 61 / NSF 372 (Drinking water materials)
EN 593 (Butterfly valves)
NACE MR0175 (Sour service - for associated oil & gas desal)

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