HomeApplicationsCompressed Gas & CNG Systems

Application Guide

Valves for Compressed Gas & CNG Systems

Compressed Natural Gas (CNG) distribution and city gas distribution (CGD) networks in India operate under PNGRB (Petroleum and Natural Gas Regulatory Board) regulation — all valves on CGD networks must be PNGRB-approved type and comply with IS 15901 (Indian standard for natural gas valves). CNG stations serving vehicles operate at 200–250 bar, demanding Class 2500 (PN 420) forged steel ball valves with fire-safe and anti-static design. Vajra Industrial Solutions supplies PNGRB-approved CNG ball valves, IS 15901-compliant isolation valves for gas distribution mains, and high-pressure gate and ball valves for industrial compressed gas systems.

IS 15901 (CNG/CGD Valves)PNGRB RegulationsAPI 6DClass 2500 (ASME B16.34)API 607 (Fire-Safe)API 6FAISO 15848-1 (Fugitive Emissions)
Get a Quote +91 9979774557

Recommended Valve Types for Compressed Gas & CNG Systems

CNG Ball Valve (Class 2500)

Class 1500 / 2500 (PN 250 / PN 420)

Why: CNG station dispenser isolation and cascade storage — 200–250 bar natural gas; fire-safe, anti-static, full-bore; PNGRB approved

Materials: A182 F316 or F316L forged body; SS316 ball; reinforced PTFE seats; stainless stem with anti-static spring

Standards: IS 15901, API 6D, API 607, PNGRB Type Approval

View CNG Ball Valve (Class 2500) products →

Gate Valve (City Gas Distribution)

Class 150 / 300 (ASME); PN 16 / PN 40 (EN)

Why: Sectional valve on medium and low-pressure gas distribution mains — IS 15901 compliance; PNGRB authorization

Materials: A216 WCB with SS316 trim for medium pressure (4–19 bar); ductile iron with NBR seats for LP (<0.1 bar)

Standards: IS 15901, API 600, PNGRB Regulations

View Gate Valve (City Gas Distribution) products →

Safety Relief Valve (CNG)

Class 2500

Why: CNG storage cascade and mother station overpressure protection — set pressure up to 250 bar

Materials: A351 CF8M SS316 with Stellite trim for high-cycle gas service

Standards: API 526, API 527, IS 2825, PNGRB type approval

View Safety Relief Valve (CNG) products →

Ball Valve (Industrial Compressed Air/N₂)

Class 150 / 300 / 600

Why: Compressed air systems (7–14 bar) and nitrogen bottles/manifolds (150–200 bar) — economy grade for inert gas

Materials: A216 WCB with SS316 trim for utility air; A182 F316L for nitrogen and food-grade CO₂

Standards: ASME B16.34, API 598

View Ball Valve (Industrial Compressed Air/N₂) products →

Critical Requirements

PNGRB Type Approval — all valves used on City Gas Distribution networks in India require PNGRB approval; Vajra supplies PNGRB-approved CNG ball valves
IS 15901 compliance — Indian Standard for natural gas valves covering material, design, testing, and marking requirements specific to gas distribution
Fire-safe design per API 607 — mandatory for all CNG station valves in compressed gas service; metal seat backup prevents external fire leakage
Anti-static design — mandatory for natural gas service; conductive path between ball/stem and body to prevent electrostatic sparking
Fugitive emissions — ISO 15848-1 Class B or better for all valves on gas distribution mains; PNGRB requires zero-leak certification
Full-bore design for metering bypass and pigging — all trunk main isolation valves on CGD networks must be full-bore per PNGRB network code

Fluid & Service Challenges

⚠Natural gas at 200–250 bar (CNG station) — pressure well above standard pipeline; adiabatic compression heating on fast filling; fire-safe metal seat required
⚠Natural gas at 4–19 bar (CGD MRS outlet) — lean dry gas; minimal corrosion risk; fire-safe and anti-static design required by PNGRB
⚠City gas with odorant (mercaptan) — attacks NBR seats; PTFE preferred in gas service
⚠Compressed air (7–14 bar plant utility) — moisture and oil carry-over; standard WCB ball valves; filter/separator upstream recommended
⚠CO₂ (carbonated beverage industry, 60–80 bar) — dry CO₂ is not corrosive; SS316L ball valves for food-grade CO₂

Material Selection Guidance

CNG station (200–250 bar, natural gas): A182 F316 or F316L forged body with Class 2500 rating; reinforced PTFE seats (full-bore design); IS 15901 and PNGRB type approval. CGD medium pressure (4–19 bar): A216 WCB with SS316 trim; IS 15901 compliance; PNGRB authorization. Utility compressed air (7–14 bar): WCB ball valves Class 150 — no special requirements. Industrial nitrogen (150–200 bar): A182 F316L Class 1500; no special treatment needed (inert gas).

Typical Service Points

CNG mother station — primary high-pressure isolation (200–250 bar, IS 15901, Class 2500 ball valves)
CNG dispenser unit — inlet and outlet isolation (200 bar, forged SS316 ball valves, fire-safe)
CGD steel main — sectional isolation (4–19 bar, WCB gate or ball valve, PNGRB approved)
CGD MDPE pipeline — service line isolation (PE ball valves — not steel; Vajra supplies the steel MDPE transition fittings)
Compressed air plant — utility header and instrument air (7–14 bar, WCB ball and butterfly valves)
Industrial nitrogen bulk storage — filling station and user header (150–200 bar, SS316L ball valves)

FAQ — Valve Selection for Compressed Gas & CNG Systems

What is PNGRB approval and which CNG valves require it?
The Petroleum and Natural Gas Regulatory Board (PNGRB) under the Indian Ministry of Petroleum regulates city gas distribution (CGD) networks. All equipment used on PNGRB-licensed CGD networks must be PNGRB type-approved, which involves testing to IS 15901 (for valves) and other Indian standards, followed by PNGRB listing. This applies to isolation valves on steel gas mains, service isolation valves, and CNG station valves. Valves at industrial consumers not connected to the CGD network (e.g., CNG used for industrial gas cylinders) may use standard API 6D or API 607 compliant valves without specific PNGRB approval.
What pressure class do I need for CNG station ball valves?
CNG is stored and dispensed at 200–250 bar (approximately 3,000–3,600 psi). ASME Class 2500 (PN 420) has a working pressure of approximately 414 bar at ambient temperature for WCB material — making it the standard pressure class for CNG station isolation valves. For cascade storage working at exactly 250 bar, Class 2500 provides adequate design margin. Use forged A182 F316 or F316L body (not cast WCB) for Class 2500 CNG service — forged bodies have better toughness and are the industry standard for high-pressure gas service.

Related Application Guides

Valves for Oil & Gas Pipelines

API 6D trunnion ball valves, slab gate, and dual-plate check valves for crude oi…

Valves for LNG & Cryogenic Service

Extended-bonnet ball, gate, and globe valves for LNG, liquid nitrogen, liquid ox…

Valves for Power Generation (Thermal, Gas, Hydro)

Gate, globe, check, and safety valves for steam and condensate service in therma…

Get a Quote

Compressed Gas & CNG Systems

Send your process conditions or P&ID — we'll recommend and quote the correct valve specification within 24 hours.

Request a Quotesales@vajravyuh.com+91 9979774557WhatsApp for Quick Quote →

Key Standards

IS 15901 (CNG/CGD Valves)
PNGRB Regulations
API 6D
Class 2500 (ASME B16.34)
API 607 (Fire-Safe)
API 6FA
ISO 15848-1 (Fugitive Emissions)

Products for This Application

Ball ValvesGate ValvesSafety & Relief Valves

All Application Guides

Oil & Gas PipelinesPharmaceutical & Biotech (Cleanroom / Hygienic)LNG & Cryogenic ServiceWater Treatment & DesalinationRefinery & Petrochemical ProcessPower Generation (Thermal, Gas, Hydro)Marine & Offshore ServiceMining & Mineral ProcessingHVAC & Building ServicesChemical & Petrochemical ProcessingHygienic Food & Beverage ProcessingHydrogen & Clean Energy ServiceDesalination & High-Purity WaterPulp & Paper IndustryAmmonia & Fertiliser PlantsNuclear Power PlantsOffshore & Subsea ApplicationsCoke Oven & Steel PlantsEthylene Crackers & Olefin PlantsChlor-Alkali PlantsSugar & Ethanol PlantsGeothermal Power PlantsAir Separation Units (ASU)Compressed Gas & CNG SystemsBiogas & Biomass PlantsCarbon Capture & Storage (CCS)Fire Protection SystemsShipbuilding & Marine RepairDistrict Heating & Cooling SystemsPharmaceutical & Biotechnology PlantsGlass, Ceramics & Refractory IndustriesTextile & Dyeing Plants