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Numaligarh · Air Separation Units (ASU)

Valves for Air Separation Units (ASU) — Numaligarh

Numaligarh Refinery Limited (NRL) — co-owned by Bharat Petroleum, Oil India Limited, and the Government of Assam — operates a 3 Mtpa refinery currently undergoing a major expansion to 9 Mtpa with integrated petrochemical units including a wax and bio-bitumen plant; NRL's greenfield expansion projects require API 6D ball valves, API 600 gate and globe valves, and check valves across all ISBL and OSBL units; Vajra Industrial Solutions supplies IBR-certified steam valves, API 6D Class 300–600 valves, and full API 598 test-certified valves for NRL expansion procurement, with delivery to Assam via road and rail from Vadodara within 7–10 business days.

ASTM G93 oxygen-cleaned cryogenic extended-bonnet SS316L ball and gate valves for ASU liquid oxygen (LOX), liquid nitrogen (LIN), and liquid argon (LAR) production columns.

ASTM G93 (Oxygen Cleaning)EIGA Doc 13 (Oxygen Safety)BS 6364 (Cryogenic Valves)ASME B16.34ISO 21011 (Cryogenic Valves)
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ASME B16.34
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Air Separation Units (ASU) Valves — Available in Numaligarh

Cryogenic Ball Valve (LOX Service)

Class 150 / 300

LOX pump suction, LOX column draw, LOX product loading — extended bonnet for −183°C; ASTM G93 oxygen-cleaned

Materials: A182 F316L forged body; SS316L ball; PCTFE seats (oxygen-compatible); SS316L extended bonnet (350+ mm)  ·  Standards: BS 6364, ASTM G93, EIGA Doc 13, API 607 (fire-safe, oxygen-critical)
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Cryogenic Gate Valve (LIN/LAR)

Class 150 / 300

Liquid nitrogen and argon column isolation, product draw, and storage tank isolation; extended bonnet required

Materials: A182 F316L body and stem; SS316L gate and seats; extended bonnet per BS 6364  ·  Standards: BS 6364, ASME B16.34, ISO 21011
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Globe Valve (Control, Cryogenic)

Class 150 / 300

Oxygen pressure letdown and LIN flow control — precision control; SS316L body; no elastomer seats in oxygen service

Materials: A182 F316L body; SS316L trim; PCTFE or SS316 seat; oxygen-cleaned  ·  Standards: BS 6364, ASTM G93, ASME B16.34
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Check Valve (Cryogenic)

Class 150 / 300

LOX pump discharge check, back-flow prevention on product filling headers

Materials: A182 F316L body; SS316L disc and hinge pin; PCTFE seat ring; oxygen-cleaned  ·  Standards: BS 6364, API 594, ASTM G93
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Air Separation Units (ASU) Industry in Numaligarh

Numaligarh Refinery Limited (NRL) — co-owned by Bharat Petroleum, Oil India Limited, and the Government of Assam — operates a 3 Mtpa refinery currently undergoing a major expansion to 9 Mtpa with integrated petrochemical units including a wax and bio-bitumen plant; NRL's greenfield expansion projects require API 6D ball valves, API 600 gate and globe valves, and check valves across all ISBL and OSBL units; Vajra Industrial Solutions supplies IBR-certified steam valves, API 6D Class 300–600 valves, and full API 598 test-certified valves for NRL expansion procurement, with delivery to Assam via road and rail from Vadodara within 7–10 business days.

Oil RefiningPetrochemicalNatural Gas PipelineCrude Oil Exploration

Critical Valve Requirements

ASTM G93 / CGA G-4.1 oxygen cleaning — all valves for LOX/GOX service must be degreased with approved solvents, then passivated; verified by UV light and/or white glove test; sealed in nitrogen-purged bags until installation
EIGA Doc 13 (European Industrial Gases Association) — comprehensive oxygen safety standard; defines material compatibility, ignition mechanisms, and design requirements for oxygen valves
No PTFE in high-pressure oxygen service (> 30 bar GOX) — PTFE can ignite in high-velocity O₂; use PCTFE or metal-to-metal seats instead; PTFE acceptable for low-pressure (<30 bar) LOX
No brass, bronze, or copper alloys — acceptable for low-pressure oxygen, but ASU practice avoids them entirely due to particle contamination risk
Extended bonnet per BS 6364 — minimum 350 mm bonnet extension for valves below −29°C to keep packing above cryogenic zone
Impact testing — all cryogenic valve components must pass Charpy V-notch impact test at −196°C per ASTM A370

Why Numaligarh's Oil Refining Sector Needs Air Separation Units (ASU) Valves

Numaligarh Refinery Limited (NRL) — co-owned by Bharat Petroleum, Oil India Limited, and the Government of Assam — operates a 3 Mtpa refinery currently undergoing a major expansion to 9 Mtpa with integrated petrochemical units including a wax and bio-bitumen plant; NRL's greenfield expansion projects require API 6D ball valves, API 600 gate and globe valves, and check valves across all ISBL and OSBL units; Vajra Industrial Solutions supplies IBR-certified steam valves, API 6D Class 300–600 valves, and full API 598 test-certified valves for NRL expansion procurement, with delivery to Assam via road and rail from Vadodara within 7–10 business days. Key facilities in the Numaligarh area — including Numaligarh Refinery Limited (NRL) — 3 Mtpa expanding to 9 Mtpa, OIL (Oil India Limited) Duliajan fields, IGGL Indradhanush Gas Grid (northeast India) — rely on Cryogenic Ball Valve (LOX Service) for their oil refining operations. Vajra Industrial Solutions supplies Cryogenic Ball Valve (LOX Service), Cryogenic Gate Valve (LIN/LAR), Globe Valve (Control, Cryogenic), Check Valve (Cryogenic) for air separation units (asu) projects across Assam, with full ASTM G93 (Oxygen Cleaning) and EIGA Doc 13 (Oxygen Safety) 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 Numaligarh

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

Also serving: Numaligarh Refinery Limited (NRL) — 3 Mtpa expanding to 9 Mtpa, OIL (Oil India Limited) Duliajan fields, IGGL Indradhanush Gas Grid (northeast India), Paradip–Numaligarh pipeline (HPCL-Assam Accord), BPCL–BRPL Guwahati Refinery supply chain

FAQ — Air Separation Units (ASU) Valves in Numaligarh

Do you supply air separation units (asu) valves in Numaligarh?
Yes. Vajra Industrial Solutions supplies Cryogenic Ball Valve (LOX Service), Cryogenic Gate Valve (LIN/LAR), Globe Valve (Control, Cryogenic), Check Valve (Cryogenic) for air separation units (asu) applications in Numaligarh, Assam. Numaligarh Refinery Limited (NRL) — co-owned by Bharat Petroleum, Oil India Limited, and the Government of Assam — operates a 3 Mtpa refinery currently undergoing a major expansion to 9 Mtpa with integrated petrochemical units including a wax and bio-bitumen plant; NRL's greenfield expansion projects require API 6D ball valves, API 600 gate and globe valves, and check valves across all ISBL and OSBL units; Vajra Industrial Solutions supplies IBR-certified steam valves, API 6D Class 300–600 valves, and full API 598 test-certified valves for NRL expansion procurement, with delivery to Assam via road and rail from Vadodara within 7–10 business days. We offer delivery to Numaligarh in 3–7 business days with full documentation and third-party inspection.
What certifications are required for air separation units (asu) valves in Numaligarh?
For air separation units (asu) in Numaligarh, the applicable standards are: ASTM G93 (Oxygen Cleaning), EIGA Doc 13 (Oxygen Safety), BS 6364 (Cryogenic Valves), ASME B16.34, ISO 21011 (Cryogenic Valves), CGA G-4.1 (O₂ Cleaning USA), API 598. 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 air separation units (asu) valves to Numaligarh?
Standard stock sizes: delivery to Numaligarh 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 ASTM G93 oxygen cleaning and is it mandatory for all ASU valves?
ASTM G93 (Standard Practice for Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environments) defines the degreasing, rinsing, and verification process for components that will be in contact with oxygen. For LOX and GOX service in ASUs, ASTM G93 cleaning is mandatory — trace hydrocarbons or particles can ignite in an oxygen-rich environment. The process involves solvent degreasing (usually with non-flammable chlorinated solvents or approved alternatives), hot DI water rinse, oven drying, UV light inspection, white-glove testing, and sealing in nitrogen-purged polyethylene bags for shipment.
Why can't I use PTFE seats in high-pressure oxygen valves?
PTFE (polytetrafluoroethylene) is generally oxygen-compatible at low pressures and low flow velocities. However, above approximately 30 bar GOX, PTFE can ignite through frictional heating from high-velocity gas impingement or particle impact ignition — a mechanism unique to oxygen service. EIGA Doc 13 and CGA G-4.1 restrict PTFE in high-pressure oxygen to specific designs with defined velocity limits. PCTFE (polychlorotrifluoroethylene) is the standard alternative — it has a higher ignition temperature than PTFE and is the seat material of choice for high-pressure LOX and GOX valves above 30 bar.

Other Application Guides for Numaligarh

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Air Separation Units (ASU) Valves — Numaligarh

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Standards

ASTM G93 (Oxygen Cleaning)
EIGA Doc 13 (Oxygen Safety)
BS 6364 (Cryogenic Valves)
ASME B16.34
ISO 21011 (Cryogenic Valves)
CGA G-4.1 (O₂ Cleaning USA)
API 598

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