Pressure Vessel Compliance in India: Complete Guide to PESO Rules, Approval & Safety 

• Pressure Vessel Compliance in India covers the design, fabrication, inspection, testing, installation, licensing and safe operation of applicable pressure vessels.
• For pressure vessels covered by the Static and Mobile Pressure Vessels (Unfired) Rules, 2016, PESO regulates the storage and transportation of specified compressed gases and cryogenic liquids.
• Compliance is not limited to obtaining a licence. Pressure-vessel design, safety fittings, relief valves, testing, premises, periodic inspection and operational controls must remain aligned with the applicable requirements.

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Introduction

A pressure vessel can look like a straightforward fabricated tank from outside. In reality, it is a safety-critical piece of equipment designed to contain gas or other material under pressure.

A few years ago, an industrial project could treat the pressure vessel as one item on the equipment procurement list. Today, that approach creates problems. Design approval, fabrication, inspection, safety fittings, site installation and statutory licensing need to be considered together.

Pressure Vessel Compliance refers to meeting the applicable legal, technical and safety requirements governing a pressure vessel throughout its lifecycle.

For pressure vessels covered by the Static and Mobile Pressure Vessels (Unfired) Rules, 2016 (SMPV(U) Rules, 2016), PESO is the principal regulatory authority. PESO’s current SOP states that the framework covers storage and transportation of compressed gases, including cryogenic liquids, in static and mobile pressure vessels.

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Why Is Pressure Vessel Compliance Important

Pressure vessels store energy in compressed gas or pressurised contents. If the vessel, fittings or protection systems fail, that stored energy can be released rapidly.

The result can range from a process interruption to a serious industrial accident.

Good Pressure Vessel Compliance therefore serves two purposes:

1. It satisfies statutory requirements.
2. It creates a documented safety framework for the equipment.

PESO’s SMPV(U) framework addresses pressure-vessel design, fabrication, inspection, testing, licensing, safety fittings and periodic compliance. Its current SOP specifically identifies activities such as stage-wise fabrication inspection, safety relief valve and fittings testing, periodic pressure-vessel testing, and certificates of safety for premises and vehicles.

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Which Rules Govern Pressure Vessel Compliance in India

The principal regulation for applicable static and mobile unfired pressure vessels is the Static and Mobile Pressure Vessels (Unfired) Rules, 2016.

PESO maintains the current SMPV(U) Rules on its official website.

The framework applies to specified compressed gases and cryogenic liquids. PESO’s 2024 SOP identifies categories including:

• Corrosive, toxic and permanent flammable gases
• Non-corrosive, non-toxic and non-flammable gases
• Liquefied flammable gases
• LPG
• LPG for automotive purposes
• LNG
• Cryogenic liquids, including liquid nitrous oxide
• Liquid carbon dioxide

Other laws, rules, Indian Standards and engineering codes may also become relevant depending on the equipment and activity.

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What Types of Pressure Vessels Are Covered

Pressure vessels encountered in Indian industry can be broadly divided into static and mobile applications.

Static Pressure Vessels

Static pressure vessels remain installed at a fixed premises.

Typical examples can include vessels used for:

• LPG storage
• LNG storage
• Industrial gases
• Carbon dioxide
• Ammonia
• Chlorine
• Other compressed gases
• Liquefied gases
• Cryogenic liquids

PESO’s SMPV(U) framework specifically regulates static pressure vessels used for storage of applicable compressed gases and related substances.

Mobile Pressure Vessels

Mobile pressure vessels are designed for transportation.

Examples can include:

• Gas tankers
• Road tankers
• Mobile cryogenic vessels
• Certain transport containers
• Other regulated mobile pressure vessels

The compliance requirements for a mobile vessel are not simply the static-vessel requirements placed on wheels.

Vehicle arrangement, mounting, transport safety, registration, inspection and the specific gas being carried must be considered.

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Documents Required for Pressure Vessel Compliance

The exact checklist depends on the application, but a typical compliance file can contain several groups of documents.

Business Documents

• Certificate of incorporation or business registration
• PAN
• GST details
• Authorisation letter
• Ownership or lease documents
• Applicant details

Technical Documents

• Pressure-vessel design drawing
• General arrangement drawing
• Design calculations
• Material specifications
• Design-code details
• Nozzle details
• Safety-relief system details
• Technical specifications

Process and Installation Documents

• Process Flow Diagram
• Piping and Instrumentation Diagram
• Site layout
• Foundation details
• Piping arrangement
• Safety-distance drawings
• Fire-safety arrangements
• Emergency systems

Manufacturing and Quality Documents

• Material Test Certificates
• Welding Procedure Specifications
• Welder qualification records
• NDT reports
• Inspection reports
• Calibration certificates
• Hydrostatic/pneumatic test records

Regulatory Documents

• Application forms
• PESO approvals
• Inspection certificates
• Safety certificates
• Safety relief valve test certificates
• Previous licence, where applicable
• Renewal or amendment documents

PESO’s statutory forms also illustrate the type of technical information expected in pressure-vessel applications, including vessel specifications, manufacturer, inspection/testing details, safety-valve specifications and set pressure.

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Pressure Vessel Compliance Process in India

A practical compliance workflow looks like this.

Step 1: Determine Applicability

Identify the vessel type, contents, capacity, pressure and intended activity.

Step 2: Select the Regulatory Route

Establish whether the equipment is covered by SMPV(U), Gas Cylinders Rules, Petroleum Rules or another framework.

Step 3: Freeze the Design

Complete the engineering basis before fabrication begins.

Step 4: Prepare Drawings and Calculations

Ensure that design drawings, calculations and specifications correspond.

Step 5: Obtain Required Design Review/Approval

Where applicable, submit the technical documents through the prescribed PESO process.

Step 6: Fabricate Under Controlled Inspection

Follow the applicable fabrication and inspection stages.

Step 7: Complete Testing

Perform the prescribed pressure, NDT and safety-device testing.

Step 8: Prepare the Installation

Ensure the site, foundation, piping, safety distances and protective systems correspond with the approved arrangement.

Step 9: Apply for the Applicable Licence

Submit the required documents and application through the PESO online system.

PESO provides an online application login for Petroleum, Gas Cylinders and SMPV(U) Rules on its official quick-links page.

Step 10: Attend Inspection

The site or vehicle may be inspected to verify compliance.

Step 11: Obtain Licence/Approval

Once the authority is satisfied with the compliance position, the applicable licence or approval can be granted and endorsed according to the rules.

Step 12: Maintain Ongoing Compliance

Continue periodic testing, inspections, renewals and controlled modifications.

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Common Pressure Vessel Compliance Mistakes

Starting Fabrication Before Regulatory Review

This can create expensive redesign work.

Selecting the Vessel Code Too Late

The design code affects calculations, materials, fabrication and inspection.

Inconsistent Technical Documents

Drawings, calculations, certificates and test reports must describe the same equipment.

Ignoring Safety Fittings

A vessel is not compliant merely because the shell is satisfactory. Safety relief and measurement devices are part of the protection system.

Poor Modification Control

Changes in vessel location, gas service, piping or safety equipment should be assessed before implementation.

Missing Periodic Testing Dates

A valid initial approval does not remove ongoing testing responsibilities.

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How Diligence Certifications Helps With Pressure Vessel Compliance

Pressure-vessel projects often involve several parties: the manufacturer, design consultant, EPC contractor, plant owner, inspection agency and regulatory authority.

Diligence Certifications helps coordinate the compliance side so that these moving parts remain aligned.

Our support can include:

• Regulatory applicability assessment
• SMPV(U) compliance review
• Document checklist preparation
• Technical-document coordination
• PESO application assistance
• Drawing and layout coordination
• Inspection preparation
• Testing coordination
• Safety relief valve compliance support
• PESO query response assistance
• Licence renewal support
• Amendment and modification assistance
• Ongoing compliance guidance

For businesses dealing specifically with fixed installations, our Static Pressure Vessel License guide provides additional information on licensing, documentation, testing and inspection.

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Conclusion

Pressure Vessel Compliance is not a single certificate that can be obtained at the end of a project. It is a lifecycle requirement covering design, material selection, fabrication, inspection, testing, safety fittings, installation, licensing and continued operation.

For pressure vessels covered by the SMPV(U) Rules, 2016, PESO’s framework provides a structured regulatory system for static and mobile vessels used with specified compressed gases and cryogenic liquids. The current PESO SOP also makes clear that fabrication inspection, safety relief valve testing, periodic vessel testing and safety certification form part of the wider compliance framework.

The most effective approach is to involve compliance specialists before fabrication or installation begins. When the design, drawings, testing programme, site layout and regulatory documents are prepared together, businesses can avoid many of the costly corrections that appear during inspection.

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Frequently Asked Questions