OISD 244 — Retail Outlet Design OISD 118 — Depot & Terminal Engineering OISD 117 — Fire Safety Systems NACE SP0169 — Cathodic Protection API 650 — Storage Tank Design ASME B31.4 — Pipeline Engineering IEC 61511 — Functional Safety & SIL NFPA 11/13/15 — Fire Suppression ISA 5.1 — P&ID Documentation IEC 61131 — PLC / SCADA Automation OISD 244 — Retail Outlet Design OISD 118 — Depot & Terminal Engineering OISD 117 — Fire Safety Systems NACE SP0169 — Cathodic Protection API 650 — Storage Tank Design ASME B31.4 — Pipeline Engineering IEC 61511 — Functional Safety & SIL NFPA 11/13/15 — Fire Suppression ISA 5.1 — P&ID Documentation IEC 61131 — PLC / SCADA Automation
India's Multi-Discipline Petroleum Engineering Consultancy

Integrated. Petroleum. Engineers.

38 years of hands-on petroleum engineering. From a single retail outlet drawing to a complete 50,000 KL depot — we deliver every discipline under one roof. OISD · API · NFPA · ASME · NACE · IEC. Concept to Commissioning.

0Years Experience
0Core Disciplines
0Codes & Standards
C2CConcept to Commissioning
Established Expertise

Who We Are

India's most complete petroleum engineering consultancy — built on three decades of ground-level project execution across every segment of the petroleum industry.

38Years
Principal Consultant
Integrated Petroleum Engineers (IPE)
  • B.E. (Mechanical Engineering) — University Gold Medalist
  • Chartered Engineer — The Institution of Engineers (India)
  • NACE CP Specialist — Level 2 Cathodic Protection
  • NEBOSH IGC — International General Certificate in Safety
  • Lead Auditor — ISO 9001 / ISO 14001 / ISO 45001
  • Competent Person — Petroleum Act & PESO notified
  • Worked with BPCL, HPCL, IOCL, CPCL, ONGC, Private EPCs
  • Executed 2000+ retail outlets, 50+ oil storage terminals with 250+ tanks, 4 cross-country pipelines, 1 lube plant concept to commissioning

Ground Truth From 38 Years

IPE was founded on a simple principle: petroleum infrastructure is too critical to be designed by generalists. Every pipeline, every tank, every fire system demands deep specialist knowledge — not just textbook theory, but the kind of understanding that only comes from decades of field execution.

Our principal consultant has personally designed, reviewed, and commissioned petroleum facilities from simple 3-nozzle retail outlets to 50,000 KL tank farms with full SCADA integration. That experience is what clients buy when they engage IPE.

We are deliberately lean and senior-led. Every drawing that leaves our office has been reviewed by an engineer with decades of relevant experience — not delegated to a junior and rubber-stamped. Our clients tell us this is rare, and we keep it that way.

Every deliverable we produce is constructable on site, compliant to the relevant code, and built to survive the scrutiny of a PESO/statutory inspection.

01 · Philosophy
Safety Above All
Every design decision begins with OISD/NFPA safety requirements — never compromised for convenience or cost.
02 · Philosophy
Code-First Design
We design to the applicable code from line one — not retrofit compliance after the drawing is complete.
03 · Philosophy
Constructable Drawings
Designs are checked for buildability — dimensions verified, clearances confirmed, contractor-ready.
04 · Philosophy
Fast Turnaround
Lean practice means no project queues. Your drawings get senior attention from day one.
Who We Serve

Our Clients

OMCs
BPCL · HPCL · IOCL · CPCL
Retail & depot expansions, upgrades, compliance drawings
🏗️
EPC Contractors
Larsen & Toubro · Punj Lloyd · SPML
Specialist sub-consultant for fire, CP, I&A, automation
🏪
Retail Dealers
DODO / COCO / CODO operators
New outlet design, LOI drawings, PESO approvals
🛢️
Private Petroleum Cos.
Nayara · Jio-BP · Shell · Rosneft
Full facility design, compliance, commissioning
🏭
Lube & Chemical Plants
Blending plants, ETP, process design
From concept to statutory approval
Complete Capability

Our Services

Ten fully integrated engineering disciplines. Each one backed by deep hands-on experience, specific codes, and complete deliverables. Click any service to see exactly what we do and what you receive.

WHY ONE FIRM?

When fire safety, cathodic protection, instrumentation and civil drawings come from one firm — they are coordinated by design. No interface clashes. No blame gaps. No revision loops between consultants. That saves 4–6 weeks on every project.

01 · Core Service
Petroleum Retail Outlet Design
Complete engineering for petrol stations — from site feasibility to PESO/statutory submission package. Highway, city, CNG+EV, integrated formats.
OISD 244PESOUSTATGCNGEV
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What We Do

  • Site feasibility & land assessment — frontage, setbacks, traffic flow, highway driveway approval geometry
  • Site layout plan — forecourt, canopy, UST area, buildings, parking, green belt as per OISD 244
  • Underground Storage Tank (UST) engineering — tank sizing, FRP double-wall design, fill points, vent pipes, leak detection, sump design
  • Dispenser island layout — LMV, HCV, CNG, DEF islands with electrical and earthing design
  • Canopy structural design — MS portal frame, column positions, foundation design, wind load analysis
  • ATG system design — automatic tank gauging, leak detection alarm, console integration
  • CNG / EV integration — cascade storage, dispenser layout, PESO licence documentation, EV charging infrastructure
  • PESO submission drawings — complete statutory approval package for Chief Controller of Explosives

Deliverables You Receive

Site Layout Plan (OISD 244)
UST Engineering Drawing
Canopy GA & Structural
Electrical Layout & SLD
PESO Submission Package
ATG System Schematic
Fire Safety Drawing
BOQ & Cost Estimate
🏭
02 · Core Service
Depot & Terminal Layout Engineering
Complete engineering for petroleum storage depots — from master layout to tank farm, loading gantry, fire protection, utilities and automation.
OISD 118API 650IS 803Dyke DesignGantry
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What We Do

  • Depot master layout — tank farm, pump house, loading/unloading gantry, administrative block, fire station, truck weighbridge, all per OISD 118
  • Storage tank design — API 650 fixed-roof and floating-roof tanks, cone-roof MS tanks to IS 803, capacity design, hydraulic loading
  • Dyke / bund design — volumetric calculation (110% of largest tank), dyke wall height, drainage sump, impervious lining
  • Tank farm piping — suction/delivery manifolds, pump sizing, line hydraulics, pig launching/receiving, OISD spacing compliance
  • Loading/Unloading gantry — bottom/top loading arms, vapour recovery unit (VRU), overfill protection, earthing/bonding
  • Truck handling facility — weigh bridge, driver facilities, emergency shutdown
  • Utilities — compressed air, nitrogen blanketing, instrument air, potable water, wastewater

Deliverables You Receive

Depot Master Layout
Tank Farm GA Drawing
Dyke Calculation Report
API 650 Tank Datasheet
Gantry Arrangement Drawing
Piping & Hydraulic Calc
Statutory Drawing Set
BOQ & Tender Package
🔥
03 · Core Service
Fire Safety System Design
Hydraulically calculated fire water systems — fixed foam systems, deluge, sprinklers, hydrant networks for petroleum facilities. OISD + NFPA compliant.
OISD 117NFPA 11NFPA 15HydraulicsFoam
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What We Do

  • Fire hazard classification — petroleum product classification, zone classification per API RP 505 / IS 5572
  • Fire water demand calculation — simultaneous demand as per OISD 117, tank cooling + foam application + supplementary streams
  • Fixed foam systems — NFPA 11 foam chambers for floating roof tanks, fixed system design, foam concentrate sizing, foam inlet pipe hydraulics
  • Water spray / deluge systems — NFPA 15 medium velocity sprays for bullet tanks, LPG bullets, transformer protection
  • Fire hydrant network — ring main design, hydrant post layout, hose reel sizing, pressure/flow hydraulic calculation
  • Fire pump selection — main electric pump + diesel standby + jockey pump, auto-start panel, NFPA 20 compliance
  • Fire detection & alarm — flame detector, heat detector, gas detector layout, FACP panel, NFPA 72 compliant
  • Portable & first-aid equipment — DCP, CO2, sand bucket locations as per OISD 244/117/118

Deliverables You Receive

Fire Water Demand Calc
Hydrant Network Drawing
Foam System Schematic
Fire Pump Datasheet
Hydraulic Calculation Report
FD&A System Layout
OISD 117 Checklist
BOQ — Fire Systems
04 · Specialist Service
Cathodic Protection
ICCP and SACP systems for buried pipelines, storage tank bottoms, and jetty structures. NACE certified design and commissioning support.
API 651NACE SP0169ICCPSACPSP0193
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What We Do

  • Soil resistivity survey interpretation — Wenner 4-pin method, soil model, corrosivity classification
  • CP design for buried pipelines — NACE SP0169, current requirement calculation, anode bed design (deep well / surface), transformer-rectifier sizing
  • Tank bottom CP — API 651, NACE SP0193, distributed anode system, impressed current or sacrificial anode selection
  • CP for UST systems — sacrificial anode CP for FRP/steel USTs per NACE SP0285, bonding and monitoring system
  • Interference / stray current assessment — AC/DC interference from adjacent structures, mitigation design
  • CP monitoring system — reference electrodes, test stations, remote monitoring, SCADA integration
  • CP commissioning support — polarisation testing, current adjustment, acceptance criteria per NACE SP0169 (-850mV criterion)
  • Holiday detection — coating defect survey, Pearson survey methodology for pipeline coatings

Deliverables You Receive

CP Design Report
Anode Bed Layout Drawing
T/R Unit Specification
Current Requirement Calc
Test Station Schedule
CP Monitoring Schematic
Commissioning Protocol
NACE Compliance Report
📊
05 · Core Service
Instrumentation & P&IDs
Complete instrumentation engineering — P&IDs, instrument index, cause & effect, hook-up drawings, MTO. ISA 5.1 and IEC 61511 compliant.
ISA 5.1IEC 61511OISD 113P&IDSIL
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What We Do

  • P&ID development — ISA 5.1/5.4 compliant piping & instrumentation diagrams from concept through IFC, with ATEX/IECEx area classification
  • Instrument index — complete instrument tag list with service, range, material, connection, signal, fail position, alarm setpoints
  • Cause & effect matrix — ESD trip logic, HIPPS design, interlocking matrix per IEC 61511
  • Control valve sizing — Cv calculation, noise prediction, cavitation check, material selection
  • Safety Instrumented System (SIS) — SIL determination (LOPA), SIS architecture, SIL verification calculation
  • Instrument hook-up drawings — pressure tapping, thermowell installation, transmitter manifolds, impulse lines
  • Instrument data sheets — complete technical data sheets for all field instruments per vendor RFQ
  • MTO / BOQ — complete material take-off for instrumentation, cable, junction boxes, instrument air manifolds

Deliverables You Receive

P&IDs — ISA 5.1
Instrument Index (Excel)
Cause & Effect Matrix
Instrument Datasheets
SIL Assessment Report
Hook-up Drawing Set
Cable Schedule
Procurement BOQ
🖥️
06 · Advanced Service
Automation & SCADA
PLC/DCS and SCADA system design for petroleum facilities — pipeline automation, depot management, ESD systems. IEC 61131-3 compliant.
PLC/DCSSCADAESD/SILIEC 61131HMI
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What We Do

  • Control system architecture — PLC vs DCS selection, redundancy design, network topology, cybersecurity zoning
  • I/O schedule & marshalling — complete I/O list, marshalling panel layout, field junction box design, cable routing philosophy
  • PLC/DCS specification — functional specification, hardware specification, FAT/SAT test procedures
  • SCADA design — HMI screen layouts, alarm management philosophy, historian configuration, OPC connectivity
  • Depot automation — tank farm management, gantry automation, truck receipt/dispatch, meter skid integration
  • Emergency Shutdown (ESD) — safety architecture, ESD logic, valve fail-safe positions, fire & gas integration
  • Communication systems — MODBUS, PROFIBUS, HART, OPC-UA, remote terminal units (RTU) for pipeline SCADA
  • Commissioning & testing support — loop testing, integrated system testing, pre-startup safety review (PSSR)

Deliverables You Receive

Control System Architecture
I/O Schedule
PLC/SCADA Specification
HMI Screen Layouts
ESD Logic Diagram
Alarm Management Doc
FAT/SAT Test Procedure
As-Built Dossier
🛢️
07 · Core Service
Pipeline Engineering
Cross-country and facility petroleum pipeline design — hydraulic analysis, stress analysis, route survey, crossings, CP, SCADA integration. ASME B31.4 / OISD 141 compliant.
ASME B31.4OISD 141HDDPigging
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What We Do

  • Route selection & alignment sheets — desktop survey, ROW assessment, crossing identification, kilometre post schedule
  • Hydraulic design — pipeline sizing, pressure gradient, pump/compressor selection, surge analysis, pig launcher/receiver sizing
  • Wall thickness design — ASME B31.4 hoop stress calculation, location class, design factor, corrosion allowance
  • Stress analysis — pipe stress analysis (CAESAR II), thermal expansion, upheaval buckling check, anchor/support design
  • Road / railway / river crossings — HDD design, sleeve design, cased crossing, open-cut crossing drawings, statutory approvals
  • CP system for pipeline — NACE SP0169, deep well anode bed, test station schedule, interference survey
  • Hydro-test procedure — test sections, fill/vent points, pressure hold duration, acceptance criteria
  • OISD 141 compliance package — complete statutory drawing and document set for cross-country petroleum pipelines

Deliverables You Receive

Alignment Sheet Set
Hydraulic Calc Report
Wall Thickness Calc
Crossing Drawing Set
Stress Analysis Report
CP Design Report
Hydro-test Procedure
OISD 141 Approval Pack
🔍
08 · Safety Service
Safety Studies — HAZOP / QRA / SIL
Formal hazard studies for petroleum facilities — HAZOP facilitation, Quantitative Risk Assessment, SIL determination and verification. IEC 61882 / IEC 61511.
HAZOPQRASILLOPAIEC 61882
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What We Do

  • HAZOP study facilitation — structured guideword study per IEC 61882, node-by-node P&ID review, deviation analysis, safeguard assessment, action register
  • HAZID (Hazard Identification) — early-stage risk screening, checklist-based hazard identification, risk ranking matrix
  • Quantitative Risk Assessment (QRA) — frequency analysis, consequence modelling (PHAST/SAFETI), risk contours, F-N curves, ALARP demonstration
  • Layer of Protection Analysis (LOPA) — IPL identification, PFD/RRF calculation, SIL requirement determination
  • SIL verification — SIL architecture selection, PFD calculation (IEC 61511), proof test interval optimisation
  • Fire & explosion consequence modelling — pool fire, jet fire, BLEVE, vapour cloud explosion scenarios, radiation/overpressure contours
  • Emergency Response Plan (ERP) — scenario-based response planning, evacuation layout, emergency resource list

Deliverables You Receive

HAZOP Report
Action Tracking Register
QRA Report with Contours
LOPA Worksheets
SIL Determination Report
SIL Verification Calc
Consequence Models
Emergency Response Plan
🧪
09 · Process Service
Lube Blending & Process Plants
Complete process engineering for lubricant blending plants, additive mixing, filling lines, ETP and utilities. From PFD to commissioning.
PFDP&IDETPUtilities
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What We Do

  • Process design — blending recipe engineering, base oil and additive storage, mixing vessel design, temperature control
  • Plant layout — equipment arrangement, maintenance access, OISD/NFPA zone classification, explosion proof equipment zoning
  • PFD and P&ID development — complete process flow diagrams and instrumented P&IDs
  • Filling & packaging line — tin/canister/drum filling automation, conveyor integration, packing hall layout
  • Effluent Treatment Plant — oil-water separator, biological treatment, PCB discharge compliance
  • Utilities design — steam/thermal oil heating, compressed air, nitrogen blanketing, potable water
  • Factory layout & civil brief — production floor plan, column grid, overhead crane layout, material flow

Deliverables You Receive

Process Design Basis
PFD with Heat/Mass Balance
P&IDs — Complete Set
Equipment Datasheet Set
Plant Layout Drawing
ETP Design Report
Utilities Sizing Calc
BOQ & Cost Estimate
🏗️
10 · Full Package
Construction & Commissioning Support
Engineering support through build — site visits, RFI responses, as-built documentation, pre-commissioning checks, commissioning punch-list management.
Site SupervisionAs-BuiltCommissioningPSSR
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What We Do

  • Construction drawing support — contractor RFI response, design clarifications, sketch issuance, drawing revision control
  • Periodic site visits — design intent verification, critical installation checks, photo documentation, site progress review
  • Material inspection support — FAT/ITP review, vendor document review, material test certificates
  • Pre-commissioning checks — hydrostatic testing, electrical continuity, instrument loop checks, commissioning punch-list development
  • Commissioning assistance — present during first fill, first fire, first product transfer — experience-backed problem solving
  • Pre-Startup Safety Review (PSSR) — structured pre-startup walkdown, safety checklist, sign-off report
  • As-built drawing production — contractor mark-up incorporation, as-built CAD drawing set, final dossier compilation
  • Statutory inspection support — liaison with PESO / Fire department / PCB, drawing responses, compliance checklist

Deliverables You Receive

Site Visit Reports
RFI Response Register
Pre-commissioning Checklist
Loop Test Records
PSSR Report
As-Built Drawing Set
Final Engineering Dossier
Statutory Clearance Pack

Need a Custom Scope?

Every project is different. Tell us what you need and we will send you a focused, no-obligation scope and fee within 24 hours.

Get a Custom Quote →
How We Work

Our Process

A structured, transparent process — so you always know where your project stands.

01
📋
Brief & Scope
We understand your site, product, standards, timeline. Define scope and fee in 24 hrs.
02
📐
Design Basis
Establish design parameters, applicable codes, design philosophy document — no ambiguity.
03
✏️
Engineering
Senior-led calculations, drawings, specifications. Discipline-coordinated from day one.
04
🔎
Internal QC
All deliverables reviewed against code checklist before client issue. Zero IFC errors.
05
📤
Delivery & Review
Issued for comment. Client review incorporated. Issued for construction with revision log.
06
🏁
Site Support
Construction queries answered. As-built drawings. Commissioning support. Final dossier.
Industry Coverage

Sectors We Serve

Petroleum infrastructure spans many facility types. IPE has deep hands-on experience in every one of these sectors — not just theoretical knowledge.

Petroleum Retail Outlets
Highway stations, city outlets, DODO/COCO/CODO formats. Simple 3-nozzle LMV-only to complex integrated stations with CNG, EV, DEF, car wash and convenience store.
  • New site design — layout to PESO submission
  • Expansion / upgrades — additional product, HCV lane
  • CNG retrofit — cascade design, OISD 179, PESO licence
  • EV integration — IS 17017, dedicated feeder design
  • ATG installation — Automatic Tank Gauge system design
🏭
Depots & Terminals
Petroleum storage depots from 5,000 KL to 200,000 KL. Tank farm engineering, loading gantry, fire protection, weigh bridge, automation — complete OISD 118 compliant design.
  • New depot design — master layout to commissioning
  • Tank farm expansion — new tanks, dyke augmentation
  • Gantry automation — loading arm, VRU, overfill
  • Fire system upgrade — foam system, ring main
  • Regulatory compliance audit — OISD gap assessment
🛢️
Pipelines
Cross-country petroleum/product pipelines. New construction, route survey, hydraulic design, stress analysis, HDD crossings, cathodic protection and full OISD 141 compliance package.
  • New pipeline design — feasibility to IFC drawings
  • Pipeline rehabilitation — integrity assessment, repair design
  • Inline inspection (ILI) — pig design, tool selection support
  • SCADA upgrade — RTU replacement, communication
  • CP survey & upgrade — coating survey, ICCP redesign
🧪
Lube & Speciality Plants
Lubricant blending plants, additive storage, filling halls, special fluid manufacturing. Process design, layout, P&IDs, ETP, utilities and statutory approvals.
  • New lube blending plant — concept to commissioning
  • Filling line upgrade — tin, canister, drum automation
  • ETP design — OWS, biological treatment, PCB compliance
  • Explosion proof zoning — IECEx/ATEX area classification
  • Factory expansion — civil brief, equipment layout
🚢
Jetties & Marine Terminals
Petroleum jetty and marine terminal facilities — loading arm design, marine fire protection, ship-shore safety interface, vapour recovery, mooring systems.
  • Jetty fire protection — NFPA 11/15, deluge design
  • Loading arm specification — API 1004 / EN 12972
  • Ship-shore safety — SIGTTO interlock design
  • Vapour recovery — VRU design, VOC compliance
  • Marine CP — NACE SP0176, cathodic protection
⚗️
Refineries & Process Plants
Brownfield engineering support for refinery units — P&ID review, HAZOP facilitation, instrument upgrade, fire & gas system design, SIL studies and compliance audits.
  • HAZOP facilitation — IEC 61882 certified process
  • SIL assessment & verification — IEC 61511
  • Brownfield P&ID update — redline to as-built
  • F&G system design — NFPA 72, gas detector placement
  • Instrumentation upgrade — analogue to HART/smart
Technical Insights

Knowledge Hub

We share what we know. These are real engineering rules and insights from 38 years of petroleum facility design — the kind of knowledge that prevents costly mistakes.

OISD 244 · Retail Outlet
UST Vent Pipe — Why 4.5 Metres Matters
OISD 244 mandates a minimum vent pipe height of 4.0 metres above finished grade for underground storage tanks. IPE always designs for 4.5m minimum — because the 0.5m allowance accounts for local grade variation and ensures the flame arrestor stays above the hydrocarbon vapour accumulation zone near grade level.
Rule: Vent pipe height ≥ 4.0m (OISD 244 Cl.9.3)
IPE Standard: 4.5m — Flame arrestor at top — min 1.5m from boundary
OISD 117 · Fire Protection
Fire Water Demand — The Simultaneous Rule
Many designers calculate fire water for only one scenario. OISD 117 requires simultaneous demand — the largest single risk item PLUS the cooling streams for adjacent tanks PLUS one hydrant stream, all running at the same time.
Rule: FW demand = Tank cooling (9 lpm/m²) + Foam (6.5 lpm/m²) + Hydrant (900 lpm)
Storage: Minimum 30 minutes autonomy at full simultaneous demand
NACE SP0169 · Cathodic Protection
The –850 mV Criterion — What It Really Means
The NACE –850 mV (vs CSE) protection criterion is a polarised potential, not an instant-off potential. Many CP systems are incorrectly set to achieve –850 mV on/instant — this over-protects and disbonds high-strength coatings. IPE designs CP systems to achieve –850 mV polarised (100 mV polarisation shift).
Criterion 1: E(polarised) ≤ –850 mV vs CSE
Criterion 2: 100 mV minimum polarisation shift (IP curve method)
API 650 · Storage Tanks
Dyke Volume — The 110% Rule
OISD 118 / IS 803 requires that the dyke (bund) enclosing a petroleum storage tank farm must contain 110% of the volume of the largest tank within the dyke. This accounts for the full tank volume PLUS 10% for fire fighting foam and water accumulation. IPE calculates net dyke volume after deducting the volume occupied by other tanks and foundations.
Net Dyke Vol ≥ 1.1 × V_largest tank
Net vol = Gross dyke vol − Vol of other tanks − Vol of foundations
ISA 5.1 · Instrumentation
P&ID — The First Line of Defence
A poorly drawn P&ID costs 10x more to fix in construction than on paper. IPE follows ISA 5.1 strictly — every instrument gets a unique tag, every safety instrument is in a separate loop, every bypass is shown. We document the design intent in a P&ID design basis so HAZOP teams and contractors have no ambiguity.
IPE P&ID Standard: ISA 5.1 symbols · IEC 61511 SIS separation · ATEX zone overlay
All safety loops on separate drawing sheet — clearly marked SIL level
ASME B31.4 · Pipeline
Location Class — The Forgotten Variable
ASME B31.4 pipeline wall thickness is controlled by location class (1–4), determined by population density within 200m of the pipeline centreline. Many pipeline designers use Location Class 1 throughout — but an urban area bypass at Class 3 requires significantly heavier wall (design factor 0.46 vs 0.72). IPE walks the route and classifies each section correctly.
Location Class 4 (F=0.40): Buildings with ≥46 occupied units per km
Wall thickness ∝ 1/F — Class 4 requires 1.8x the wall of Class 1
0
Years Experience
0
2000+ Retail Outlets
0
50+ Oil Storage Terminals
0
250+ Storage Tanks
0
Codes Covered
1
Lube Plant — Concept to Commissioning
Complete Code Coverage

Standards & Codes

IPE designs to 25+ Indian and international codes. Hover over any standard to see what we use it for. Our compliance is not checkbox — it is design practice from day one.

OISD — Oil Industry Safety Directorate (India)
OISD 117
Fire Protection of Petroleum Depots & Terminals
OISD 118
Layout of Petroleum Installations — Spacing & Zoning
OISD 244
Safety Standard for Petroleum Retail Outlets
OISD 113
Classification of Areas for Petroleum — Zone Classification
OISD 116
Fire Protection for Petroleum Refineries
OISD 141
Design & Construction of Cross-Country Petroleum Pipelines
OISD 144
Liquefied Petroleum Gas — Storage at Bulk Installations
OISD 150
Safety Requirements at Petroleum Depots & Terminals
OISD 156
Safety of Electrical Installations
OISD 179
CNG Stations for Automotive Sector
API — American Petroleum Institute
API 650
Welded Tanks for Oil Storage — Design, Fabrication, Inspection
API 620
Design and Construction of Large, Low-Pressure Storage Tanks
API 651
Cathodic Protection for Aboveground Petroleum Storage Tanks
API 652
Lining of Aboveground Petroleum Storage Tank Bottoms
API 653
Tank Inspection, Repair, Alteration and Reconstruction
API 2000
Venting Atmospheric and Low-Pressure Storage Tanks
API 2021
Management of Atmospheric Storage Tank Fires
API 2350
Overfill Protection for Storage Tanks in Petroleum Facilities
API MPMS
Manual of Petroleum Measurement Standards — Tank Gauging
API RP 505
Recommended Practice for Classification of Locations for Petroleum
NFPA — National Fire Protection Association
NFPA 11
Low-, Medium-, and High-Expansion Foam Systems
NFPA 13
Installation of Sprinkler Systems
NFPA 15
Water Spray Fixed Systems for Fire Protection
NFPA 16
Deluge Foam-Water Sprinkler and Spray Systems
NFPA 20
Installation of Stationary Pumps for Fire Protection
NFPA 24
Installation of Private Fire Service Mains
NFPA 30
Flammable and Combustible Liquids Code
NFPA 30A
Code for Motor Fuel Dispensing Facilities
NFPA 72
National Fire Alarm and Signaling Code
ASME · NACE · ISA · IEC · IS · BS EN
ASME B31.4
Pipeline Transportation Systems for Liquids and Slurries
ASME B31.8
Gas Transmission and Distribution Piping Systems
NACE SP0169
Control of External Corrosion on Underground Metallic Pipelines
NACE SP0193
External Cathodic Protection of On-Grade Carbon Steel Tank Bottoms
NACE SP0285
External Corrosion Control of UST — FRP & Steel Tanks
ISA 5.1
Instrumentation Symbols and Identification — P&ID symbols
ISA 5.4
Instrument Loop Diagrams
IEC 61511
Functional Safety — SIS for Process Industry
IEC 61882
Hazard and Operability Studies — HAZOP Application Guide
IEC 61131-3
Programmable Controllers — Programming Languages
IEC 60079
Explosive Atmospheres — Equipment & Protection
IS 803
Code of Practice for Storage of Petroleum Products in MS Tanks
IS 5572
Classification of Hazardous Areas for Electrical Installations
BS EN 12954
Cathodic Protection of Buried or Immersed Metallic Structures
Our Differentiators

Why Choose IPE

There are many engineering consultants. Here is why petroleum projects specifically benefit from IPE's approach — and why our clients come back project after project.

01 · Core Strength
38 Years of Ground Truth
Every calculation, every layout decision, every pipe size is informed by what actually works on site — not just what satisfies the code on paper. 38 years of commissioning, construction issues and field experience is built into every deliverable.
02 · Core Strength
Every Discipline. One Firm.
Fire safety, CP, instrumentation, automation and layout are designed together — not by 4 separate consultants with no coordination. This eliminates the interface clashes and revision loops that kill project schedules and budgets. One point of contact. One version of truth.
03 · Core Strength
Indian + International Standards
We are equally fluent in OISD (mandatory in India) and international codes — API, NFPA, ASME, NACE, IEC. Projects with foreign collaborators or international financiers get designs that satisfy both statutory Indian requirements and global best practice.
04 · Core Strength
Designs That Actually Get Built
We have personally supervised construction. We know what contractors struggle with. Our drawings include construction notes, installation sequences, and tolerances — not just design intent. The result: fewer RFIs, fewer NCRs, fewer surprises.
05 · Core Strength
Complete, Sealed Calculations
Every drawing is backed by a calculation — fire water demand, hydraulic gradient, dyke volume, wall thickness, SIL PFD. All calculations are reviewed, signed, and issued as part of the deliverable. Clients and PESO inspectors get full traceability from requirement to design.
06 · Core Strength
Fast, Lean, Cost-Effective
As a senior-led lean practice, there are no project queues. Your project gets principal-level attention from day one. No overhead of a large firm. No junior engineers learning on your project. Typical turnaround: 7–10 working days for a retail outlet package.
Common Questions

Frequently Asked Questions

Answers to the most common questions from new clients — covering scope, process, standards, fees and timelines.

What drawings do I need for a new petrol station PESO approval? +
For PESO (Chief Controller of Explosives) approval of a new retail outlet, you need: Site layout plan (OISD 244 compliance), Underground Storage Tank drawing (capacity, spacing, vent pipe), Electrical area classification drawing (OISD 113), Earthing and bonding schematic, Fire safety arrangement drawing (OISD 117), and a covering letter from a Competent Person. IPE prepares the entire statutory submission package — drawings, calculations and covering documentation — in one go. Our principal consultant is a notified Competent Person, so the submission carries the required professional authority.
How long does a retail outlet design take? +
A standard retail outlet design (site layout, UST drawing, fire safety, electrical layout, PESO package) takes 7–10 working days from receipt of site survey data and brief. Complex sites with CNG, EV and HCV lanes take 12–15 working days. We confirm the exact timeline at the time of scope confirmation — and we keep to it. Urgent submissions can be discussed on a case-by-case basis.
Do you design for private petroleum companies (non-OMC)? +
Yes. IPE works with all categories — BPCL, HPCL, IOCL authorised dealers, private petroleum retailers (Nayara, Jio-BP, Shell, Rosneft), EPC contractors, and private industrial clients. The same OISD standards apply regardless of the oil company — so our design process and quality are identical across all clients.
What information do you need to start a project? +
To start a retail outlet design we need: (1) Site survey drawing (or land dimensions), (2) Product range (MS/HSD/CNG/EV/DEF), (3) Number of dispensing nozzles planned, (4) OMC norms document if applicable, (5) Soil test report for UST design (or we design conservatively). For depot projects we additionally need: product list, throughput, truck/rail/pipeline receipt/dispatch modes, and local fire department requirements. We send you a simple one-page questionnaire to collect all this efficiently.
What is the difference between OISD 117, 118 and 244? +
These are three different OISD standards covering different facility types: OISD 117 is about fire protection systems design — fire water demand, hydrant network, foam systems, fire pumps — applicable to all petroleum installations. OISD 118 covers layout and spacing requirements for petroleum depots, terminals and large storage facilities — tank-to-tank distances, dyke design, road widths. OISD 244 is specific to retail outlets (petrol stations) — canopy heights, dispenser setbacks, UST locations, entry/exit widths, fire equipment. For a retail outlet, all three typically apply: 244 for layout, 117 for fire systems, and 118 if the outlet has bulk storage exceeding certain quantities.
Can you do designs for remote / rural sites across India? +
Yes — IPE works remotely for the full engineering scope. We need good survey data (which can be done locally) and we coordinate everything digitally. We have successfully delivered projects in remote locations in Rajasthan, Assam, Andaman and remote North-East states. For construction supervision visits, travel can be arranged at actuals. The engineering quality is identical regardless of location.
Do you provide designs compliant with international standards for export-financed projects? +
Yes. IPE is equally fluent in API, NFPA, ASME, NACE, IEC and ISO standards. Projects financed by World Bank, ADB, international oil majors or foreign EPCs often require designs that meet both Indian statutory requirements (OISD, PESO) and international standards simultaneously. We have experience delivering designs that satisfy both — which requires understanding where the codes align and where they diverge. We will confirm the applicable code matrix at the design basis stage for any such project.
What is your fee structure? +
Fees depend on scope and complexity. A simple retail outlet design (layout + PESO package) starts from ₹1.5 Lakhs. A full depot engineering package (layout to IFC) typically ranges from ₹8–25 Lakhs depending on tank farm size and discipline scope. Safety studies (HAZOP, QRA) are quoted per day-rate or lump sum per study. We provide a detailed scope and fixed-fee quotation for every project before commencing — so there are no surprises. Contact us for a no-obligation quotation.
Do you provide drawings in AutoCAD format? +
Yes. All drawings are prepared in AutoCAD (.dwg format) and issued as PDF for review/approval and DWG for contractor use. Drawings follow a consistent layered drawing standard with title block, revision control, and north arrow. We can also provide DXF format, and for BIM-enabled projects, coordination with 3D modelling platforms can be discussed. Drawing register and revision log are maintained throughout the project.
Can you review and certify drawings prepared by others? +
Yes — third-party drawing review and certification is a service we offer. We check against the applicable OISD/API/NFPA/ASME code, issue a detailed review comment sheet, and once issues are resolved, provide a certification letter from our principal consultant (Chartered Engineer). This is commonly required when a contractor's in-house drawings need certification by a registered professional before PESO/statutory submission.
Client Feedback

What Clients Say

Relationships built on technical credibility and delivery — not just proposals.

"The fire water hydraulic calculations were the most thorough we have seen on any retail project. PESO approved first submission — no queries. IPE's drawings speak for themselves."
SR
Sr. Regional Manager
Major OMC — West Zone
"We engaged IPE for the cathodic protection design on our 80km cross-country pipeline. The NACE-certified design and commissioning support was exactly what our international lender required. Delivered on time."
PK
Project Director
EPC Contractor — Pipeline Division
"IPE did what three separate firms could not — coordinated the fire, CP and instrumentation drawings for our depot expansion so the contractor had zero interface conflicts. Saved us 6 weeks of revision cycles."
AM
Terminal Manager
Private Petroleum Terminal — East India
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