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Valves for Nuclear Power Plants — Tinsukia

Tinsukia is the operations gateway for upper Assam's century-old upstream oil patch — ONGC's Duliajan field (18 km) produces 2.5 million metric tonnes of crude annually from 1,300+ wells and requires wellhead gate valves per API 6A, choke manifold valves, NACE MR0175-certified ball valves for H2S sour-gas service, and erosion-resistant trim for production separator duty; Digboi Refinery (IOC, 1901 vintage, 37 km), India's oldest operating refinery, requires API 600 bolted-bonnet gate valves and API 602 forged ball valves for distillation and visbreaking units; AGCL's gas distribution grid and the under-construction Indradhanush Gas Grid (Numaligarh–Tinsukia–Silapathar) add ASME Class 600 natural-gas ball valves to the regional procurement pipeline.

ASME Section III Class 2/3 gate, globe, and check valves with N-stamp traceability for nuclear power plant balance-of-plant, auxiliary, and spent-fuel cooling systems.

ASME Section III (Class 2/3)ASME B16.34IEEE 382 (MOV)IEEE 344 (Seismic)10 CFR 50 Appendix B
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Nuclear Power Plants Valves — Available in Tinsukia

Gate Valve (ASME Sec. III Cl.2)

Class 150 / 300 / 600 (ASME B16.34 ratings)

Main isolation on auxiliary cooling, emergency core cooling (ECCS) suction, and spent fuel pool cooling

Materials: A351 CF8M (SS316 cast), A182 F316 forged (Class 2); WCB with SS316 trim (Class 3)  ·  Standards: ASME Section III NB/NC/ND, ASME B16.34, ASME B16.10
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Globe Valve

Class 150 / 300

Throttling and control on reactor auxiliary cooling, chemical dosing, and letdown systems

Materials: A351 CF8M SS316, A182 F316L for radioactive waste service  ·  Standards: ASME Section III Class 2/3, IEEE 382 for motor-operated versions
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Check Valve

Class 150 / 300 / 600

Back-flow prevention on ECCS injection lines, charging pump outlets, and feedwater systems

Materials: A351 CF8M (SS316), A182 F316 lift or swing check  ·  Standards: ASME Section III Class 2/3, API 594
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Butterfly Valve

Class 150

Large-bore isolation on service water, component cooling water, and turbine building HVAC

Materials: A216 WCB with SS316 disc and EPDM seat; rubber-lined for raw water service  ·  Standards: ASME Section III Class 3, AWWA C504, IEEE 382
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Nuclear Power Plants Industry in Tinsukia

Tinsukia is the operations gateway for upper Assam's century-old upstream oil patch — ONGC's Duliajan field (18 km) produces 2.5 million metric tonnes of crude annually from 1,300+ wells and requires wellhead gate valves per API 6A, choke manifold valves, NACE MR0175-certified ball valves for H2S sour-gas service, and erosion-resistant trim for production separator duty; Digboi Refinery (IOC, 1901 vintage, 37 km), India's oldest operating refinery, requires API 600 bolted-bonnet gate valves and API 602 forged ball valves for distillation and visbreaking units; AGCL's gas distribution grid and the under-construction Indradhanush Gas Grid (Numaligarh–Tinsukia–Silapathar) add ASME Class 600 natural-gas ball valves to the regional procurement pipeline.

Crude Oil Production (ONGC Duliajan)Natural Gas ProcessingTea Cultivation & ProcessingCoal Mining (Margherita-Ledo)Timber & Plywood

Critical Valve Requirements

ASME Section III Class 2/3 design: complete material traceability (Certified Material Test Reports — CMTRs) for all pressure-boundary components
N-stamp or NA-stamp: third-party ASME Nuclear Inspector oversight for Class 2 and above
Seismic qualification per IEEE 344 — valves on safety-related systems must withstand Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE)
Motor-operated valves (MOVs) qualified per IEEE 382 — torque, voltage variation, and harsh-environment performance testing
QA programme per 10 CFR 50 Appendix B (USA) or AERB Safety Guide (India) — design control, procurement document control, inspection, and test records
No substitution of materials without NCR (Non-Conformance Report) and AERB/NRC approval — traceability is mandatory

Why Tinsukia's Crude Oil Production (ONGC Duliajan) Sector Needs Nuclear Power Plants Valves

Tinsukia is the operations gateway for upper Assam's century-old upstream oil patch — ONGC's Duliajan field (18 km) produces 2.5 million metric tonnes of crude annually from 1,300+ wells and requires wellhead gate valves per API 6A, choke manifold valves, NACE MR0175-certified ball valves for H2S sour-gas service, and erosion-resistant trim for production separator duty; Digboi Refinery (IOC, 1901 vintage, 37 km), India's oldest operating refinery, requires API 600 bolted-bonnet gate valves and API 602 forged ball valves for distillation and visbreaking units; AGCL's gas distribution grid and the under-construction Indradhanush Gas Grid (Numaligarh–Tinsukia–Silapathar) add ASME Class 600 natural-gas ball valves to the regional procurement pipeline. Key facilities in the Tinsukia area — including ONGC Duliajan Oil Fields (18 km), Digboi Refinery — India's Oldest (37 km), Margherita-Ledo Coal Mines (Assam Co.) — rely on Gate Valve (ASME Sec. III Cl.2) for their tea cultivation & processing operations. Vajra Industrial Solutions supplies Gate Valve (ASME Sec. III Cl.2), Globe Valve, Check Valve, Butterfly Valve for nuclear power plants projects across Assam, with full ASME Section III (Class 2/3) and ASME B16.34 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 Tinsukia

Vajra Industrial Solutions offers delivery to Tinsukia in 3–7 business days. Emergency dispatch available for plant shutdowns and critical site requirements.

Also serving: ONGC Duliajan Oil Fields (18 km), Digboi Refinery — India's Oldest (37 km), Margherita-Ledo Coal Mines (Assam Co.), Indradhanush Gas Grid Hub — Numaligarh Corridor

FAQ — Nuclear Power Plants Valves in Tinsukia

Do you supply nuclear power plants valves in Tinsukia?
Yes. Vajra Industrial Solutions supplies Gate Valve (ASME Sec. III Cl.2), Globe Valve, Check Valve, Butterfly Valve for nuclear power plants applications in Tinsukia, Assam. Tinsukia is the operations gateway for upper Assam's century-old upstream oil patch — ONGC's Duliajan field (18 km) produces 2.5 million metric tonnes of crude annually from 1,300+ wells and requires wellhead gate valves per API 6A, choke manifold valves, NACE MR0175-certified ball valves for H2S sour-gas service, and erosion-resistant trim for production separator duty; Digboi Refinery (IOC, 1901 vintage, 37 km), India's oldest operating refinery, requires API 600 bolted-bonnet gate valves and API 602 forged ball valves for distillation and visbreaking units; AGCL's gas distribution grid and the under-construction Indradhanush Gas Grid (Numaligarh–Tinsukia–Silapathar) add ASME Class 600 natural-gas ball valves to the regional procurement pipeline. We offer delivery to Tinsukia in 3–7 business days with full documentation and third-party inspection.
What certifications are required for nuclear power plants valves in Tinsukia?
For nuclear power plants in Tinsukia, the applicable standards are: ASME Section III (Class 2/3), ASME B16.34, IEEE 382 (MOV), IEEE 344 (Seismic), 10 CFR 50 Appendix B, AERB (India), NRC Regulatory Guides. 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 nuclear power plants valves to Tinsukia?
Standard stock sizes: delivery to Tinsukia in 3–7 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 is ASME Section III and why does nuclear require it?
ASME Section III is the Boiler and Pressure Vessel Code for Nuclear Facility Components. Unlike ASME B16.34 (industrial valves), Section III imposes full design analysis, material traceability to mill certificates (CMTRs), N-stamp third-party oversight during manufacturing, and complete quality records. Class 1 covers the primary pressure boundary (reactor coolant), Class 2 covers safety-related secondary systems (ECCS, spent fuel cooling), and Class 3 covers other safety-related systems (service water). Vajra supplies Class 2 and 3 components for balance-of-plant applications.
What is the difference between nuclear Class 2 and Class 3 valves?
ASME Section III Class 2 applies to systems that could affect the safety function of the reactor coolant boundary — e.g., emergency core cooling, spent fuel pool cooling. Class 3 applies to systems important to safety but with a lower direct interface — service water, fire protection, component cooling water. Class 2 requires more rigorous design documentation, full material traceability, and N-stamp inspection. Class 3 has slightly relaxed requirements but still demands CMTRs and a documented QA programme.

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Nuclear Power Plants Valves — Tinsukia

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Standards

ASME Section III (Class 2/3)
ASME B16.34
IEEE 382 (MOV)
IEEE 344 (Seismic)
10 CFR 50 Appendix B
AERB (India)
NRC Regulatory Guides

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