QUAD International
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Partner with Technical Excellence

Ready to Discuss Your Industrial Scope?

From mechanical erection and plant commissioning to high-yield solar PV installations, our senior engineering leads are ready to mobilize.

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QUAD International Logo

Engineering, construction, and trading company based in Dhaka, delivering dependable mechanical, EPC, commissioning, and sustainable solar energy solutions across Bangladesh.

ASME & API Compliant Documented QA/QC

Core Services

  • Mechanical Construction
  • EPC Services
  • Project Erection & Commissioning
  • Solar Energy – Supply & Installation
  • Industrial AC Service & Supply
  • Material Import & Export
  • Project Management & O&M Support

Pages

  • About Company
  • Services Directory
  • Field Track Record
  • Contact & Location

Headquarters

415 Faydabad Dokkhin Para, Faydabad Madrasha, Dokkhinkhan, Dhaka-1230, Bangladesh
+880 1673 789551+880 1828 080970
quadint.bd@gmail.com

Mohammad Saiful Islam

Co-founder & Project Coordinator

© 2026 QUAD International. Dhaka-1230, Bangladesh. All rights reserved.

Industrial photography under Unsplash Editorial License.

Industrial Contracting · ASME / API / NFPA Standards

Industrial EPC, Mechanical Piping & Power Plant Execution

QUAD International provides accountable turnkey engineering, equipment erection, high-pressure gas RMS, and industrial solar PV across Bangladesh. Led by senior engineers with proven refinery turnaround credentials.

Core Disciplines:Mechanical ConstructionEPCErection & CommissioningSolarIndustrial ACImport & Export
View Engineering Services+880 1673 789551
Leadership Track Record
Field-Verified Project Delivery
VERIFIED
300 MMSCFD Gas RMS Skid365 MW CCPP

Ghorashal 4th Unit Repowering — High-pressure gas filtration, regulation & metering.

Petroleum Oil Refinery2,500 BPD

Aqua Refinery Ltd. — Mechanical erection, column integration & plant commissioning.

Industrial Solar PV SystemsNet-Metered

Rooftop industrial solar arrays, inverter sync, tier-1 PV modules & long-term O&M.

QA/QC Documentation HSE Zero-Harm Target
1,000+MW
Combined Plant Capacity Experience
Gas RMS, CCPP repowering, and refinery installations
300MMSCFD
Peak Gas RMS Station Scale
Tender engineering, commissioning & operations
100%HSE
Zero-Compromise Safety Culture
Approved method statements & permit-to-work protocols
7Disciplines
Single-Point Accountability
From design & procurement to start-up & O&M
Disciplines
All Specs
About QUAD International

Dependable Engineering and Process-Plant Solutions for Bangladesh

QUAD International is an engineering, construction and trading company based in Bangladesh, founded to deliver dependable industrial solutions to the nation’s growing energy, process and infrastructure sectors.

We combine hands-on field experience in refinery and process-plant environments with disciplined project management, so that every project is completed safely, on schedule and to specification.

Although QUAD International is an agile and modern company, it is led by professionals with extensive hands-on experience in oil refinery maintenance, shutdown work, and engineering documentation across Bangladesh’s major power stations and industrial facilities.

Our core business is mechanical construction, EPC services, and project erection and commissioning. Alongside these, we supply and install high-yield solar energy systems, provide industrial air-conditioning service and supply, and handle international material import and export, giving our clients a single, accountable partner from engineering and procurement through to start-up and long-term support.

Operating Principles:
Safety FirstZero-compromise approach to HSE on every site and in every task. Strict adherence to Permit-to-Work, Job Safety Analysis (JSA), and PPE standards.
QualityRight-first-time workmanship backed by rigorous inspection and documented QA/QC according to ASME, API, and client specifications.
IntegrityHonest communication, ethical dealings, and total accountability for project milestones, engineering calculations, and results.
CommitmentDelivering on schedule and within budget, with an agile, solution-focused team that stays on-site through commissioning and handover.
Read Full Company Profile & Leadership Dossier
QUAD International Site Engineers and Project Leads
Our Vision

To be a trusted national partner in industrial construction and sustainable energy, recognised for technical excellence, safety and integrity.

Our Mission
  • •Deliver quality-assured mechanical, EPC and commissioning services that meet international codes and client requirements.
  • •Protect people, assets and the environment through a strong safety-first culture.
  • •Support Bangladesh’s transition to cleaner energy through well-engineered solar solutions.
  • •Build long-term client relationships founded on transparency, reliability and responsiveness.
Engineering Capabilities

Turnkey Industrial & Mechanical Solutions

From high-pressure piping alignment and CCPP repowering to turnkey rooftop solar installations, we deliver single-point engineering accountability across Bangladesh.

Complete Engineering Directory
Mechanical Construction
01Mechanical
Mechanical Construction

Complete mechanical works for refineries, power plants, process facilities, and heavy industrial plants.

Key Capabilities:
Fabrication and installation of piping systems, pipe racks and supports
Installation of static equipment: vessels, columns, heat exchangers, storage tanks
Rotating equipment installation and precision alignment: pumps, compressors, turbines
Technical Scope
EPC Services
02Turnkey
EPC Services

Engineering, Procurement and Construction delivered under a single point of responsibility.

Key Capabilities:
Basic and detailed engineering support, design review and documentation
Vendor selection, global procurement, expediting and quality surveillance
Construction management, planning, scheduling and cost control
Technical Scope
Project Erection & Commissioning
03Commissioning
Project Erection & Commissioning

Safe, systematic transition from mechanical completion to an energized, commercial running plant.

Key Capabilities:
Pre-commissioning: instrument loop checks, chemical cleaning, leak and pressure testing
Commissioning support, performance testing and start-up assistance
Punch-list categorization, resolution tracking and closeout management
Technical Scope
Solar Energy – Supply & Installation
04Renewable
Solar Energy – Supply & Installation
High-Yield Rooftop PV & Net-Metering

High-efficiency rooftop & industrial solar PV systems, from engineering survey to grid connection.

Key Capabilities:
Supply of tier-1 solar panels, grid-tie inverters, battery storage, and mounting structures
Site survey, shadow simulation, system sizing and customized electrical design
Professional installation, net-metering support, testing and grid synchronization
Technical Scope
Industrial AC Service & Supply
05HVAC
Industrial AC Service & Supply

Reliable HVAC cooling solutions for industrial plants, control rooms, and commercial facilities.

Key Capabilities:
Supply and installation of VRF/VRV systems, chillers, and package units
Complete AC servicing, chemical coil cleaning, filter decontamination and washing
Pipe insulation, vapor barrier wrapping, valves, fittings and installation materials
Technical Scope
Material Import & Export
06Trading
Material Import & Export

Reliable international sourcing and expedited supply of specialized industrial materials and spares.

Key Capabilities:
Piping materials: seamless carbon/alloy pipes, flanges, fittings (CS, SS, Alloy)
Valves: gate, globe, check, ball, and control valves with full certification
Electrical & instrumentation items, transmitters, sensors, and spare parts
Technical Scope
Project Management & O&M Support
07Management
Project Management & O&M Support

Comprehensive lifecycle oversight, shutdown assistance, and plant maintenance engineering.

Key Capabilities:
Project coordination, schedule tracking, progress reporting and stakeholder management
Operation and maintenance (O&M) contracts, shutdown and turnaround manpower
Engineering consultancy documentation, P&ID updates, and technical audit reporting
Technical Scope
Custom Fabrication & Turnaround Logistics
Need custom piping spools, ASME code compliance, or specialized valve sourcing?

Our lead engineers develop custom method statements, weld procedure specifications (WPS), and BOQs matching your exact tender package.

Field Experience Matrix

Major Power, Gas RMS & Refinery Projects

Directly executed by members of our technical leadership across Bangladesh’s critical energy infrastructure. From 300 MMSCFD gas regulation stations to 2,500 BPD petroleum refineries.

Complete Project Log
#Project & LocationFacility & CapacityScope of WorkSector
01
Bhola Power Station – NBBL 220 MW CCPP
Bhola, Bangladesh
Gas Regulator Station
48 MMSCFD

TA 956 SSV, FC and MFO maintenance and commissioning

Combined Cycle Power PlantTA 956 SSV ValvesFuel Conditioning Unit
Power Plant
02
Aqua Refinery
Ghorashal, Narsingdi, Bangladesh
Petroleum Oil Refinery
2,500 BPD

Plant installation and commissioning; installation documentation; mechanical maintenance of rotating and static equipment

Continuous Process PlantDistillation ColumnsStatic & Rotating Assets
Refinery
03
Regent 108 MW Power Plant
Ghorashal, Dhaka, Bangladesh
Gas RMS Station
20 MMSCFD

Installation, hydrotesting, and turnkey commissioning

Regulating & Metering StationHigh-Pressure Gas LineFlow Computers
Gas RMS
04
Summit Meghnaghat 337 MW Dual Fuel CCPP
Meghnaghat, Dhaka, Bangladesh
Gas RMS Station
60 MMSCFD

Mechanical installation, line filtration setup, and commissioning

Major Independent Power Producer (IPP)Dual Fuel CCPPGas Filtration Skids
Power Plant
05
Sahjibazar 330 MW CCPP
Sahjibazar, Hobigonj, Bangladesh
Gas RMS Station
65 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

Combined Cycle FacilityFull Lifecycle ExecutionOperational Support
Gas RMS
06
Sahjibazar Power Plant 50 & 70 MW
Sahjibazar, Hobigonj, Bangladesh
Gas RMS Station
35 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

Multi-Unit StationTender Engineering SupportPressure Reduction Trains
Gas RMS
07
Ghorashal 4th Unit Repowering Power Plant 365 MW
Ghorashal, Palash, Bangladesh
Gas RMS Station
300 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

Highest Capacity Station (300 MMSCFD)Repowering ProjectCritical Grid Node
Gas RMS
PROJECT 01Power Plant
Bhola Power Station – NBBL 220 MW CCPP
Bhola, Bangladesh
Facility & Capacity

Gas Regulator Station

48 MMSCFD

TA 956 SSV, FC and MFO maintenance and commissioning

PROJECT 02Refinery
Aqua Refinery
Ghorashal, Narsingdi, Bangladesh
Facility & Capacity

Petroleum Oil Refinery

2,500 BPD

Plant installation and commissioning; installation documentation; mechanical maintenance of rotating and static equipment

PROJECT 03Gas RMS
Regent 108 MW Power Plant
Ghorashal, Dhaka, Bangladesh
Facility & Capacity

Gas RMS Station

20 MMSCFD

Installation, hydrotesting, and turnkey commissioning

PROJECT 04Power Plant
Summit Meghnaghat 337 MW Dual Fuel CCPP
Meghnaghat, Dhaka, Bangladesh
Facility & Capacity

Gas RMS Station

60 MMSCFD

Mechanical installation, line filtration setup, and commissioning

PROJECT 05Gas RMS
Sahjibazar 330 MW CCPP
Sahjibazar, Hobigonj, Bangladesh
Facility & Capacity

Gas RMS Station

65 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

PROJECT 06Gas RMS
Sahjibazar Power Plant 50 & 70 MW
Sahjibazar, Hobigonj, Bangladesh
Facility & Capacity

Gas RMS Station

35 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

PROJECT 07Gas RMS
Ghorashal 4th Unit Repowering Power Plant 365 MW
Ghorashal, Palash, Bangladesh
Facility & Capacity

Gas RMS Station

300 MMSCFD

Tender documentation, detail engineering, installation, commissioning and operation

Tender & Turnaround Preparation
Do you have an upcoming tender, turnaround, or gas RMS expansion?

Our engineering team reviews your isometric drawings, P&IDs, and equipment schedules to deliver verified BOQs and execution methodologies.

Submit Project Scope
Founders' Engineering Core

Technical Experience in Critical Plant Environments

QUAD International is built on the practical field experience of its founders in high-pressure refinery, power plant, and petrochemical units. Our team brings deep technical capabilities covering rotating machinery, code-compliant engineering documentation, and complex heavy lifting.

Rotating Machinery & Compression
Precision Reciprocating & Centrifugal Asset Overhaul

Expert overhaul, valve reassembly, and thermal diagnostics for refinery process compressors and continuous production units.

Overhaul of LPG reciprocating compressors: valve reassembly (concentric ring and HOERBIGER-type valves), piston ring and liner replacement, rod packing blow-by investigation
Performance diagnostics of two-stage reformer recycle hydrogen compressors: mass flow, compression ratio, and inter-stage pressure analysis
Structured troubleshooting using valve-cap temperature surveys and isentropic discharge temperature checks
Maintenance of HDS (Hydrodesulfurization) and CRU (Continuous Reforming Unit) process units: rotating, static, and fired equipment
Codes:API 618API 610API 670
Engineering & Metallurgical Compliance
Rigorous Process Engineering & Metallurgy Documentation

Full-discipline engineering packages conforming to ASME, API, and NACE codes for severe refinery and chemical services.

P&ID and Basic Engineering Document for a 50 TPD used lubricating oil (ULO) recycling plant
Technical reference for post-weld heat treatment (PWHT) of 1.25Cr–0.5Mo filler wire (ER 80S-B2) in refinery service
Cost estimation workbooks, fee quotations, and consultancy documentation for national refinery projects
Storage-tank volume calculation charts, strapping tables, and painting surface-area estimation for cost planning
Shutdown maintenance assessment forms and standardized plant maintenance checklists for HDS and CRU operations
Codes:ASME BPVCASME B31.3API RP 582NACE MR0175
Lifting & Rigging Engineering
Rigging Calculations & Heavy Lifting Safety

Safe execution of complex overhead lifts within congested plant environments with certified mechanical advantage systems.

Design and specification of block-and-tackle lifting arrangements (3:1 mechanical advantage) for heavy overhead equipment
Rigging study development including center-of-gravity (COG) calculations, sling tension, and crane load radius
Tandem crane lift coordination for tall distillation columns and heavy heat exchangers
Daily lift plan authorization and site safety exclusion zone enforcement
Codes:ASME B30OSHA 1926 Rigging
Refinery & Process Rigor
Hydrocarbon Safety & ASME B31.3 Pressure Piping Qualification

All weldments, flange torqueing sequences, and hydrostatic pressure testing comply with ASME B31.3, API 1104, and ASME Section IX certified welder qualification procedures.

Zero LTI Target
Methodical Execution

Our Approach to Project Execution

A disciplined 6-stage delivery model ensuring transparency, zero safety lapses, and on-time commissioning.

01
Understand

Detailed review of scope, specifications, international codes, and site conditions.

Key Deliverable:Scope matrix, site hazard assessment, code compliance roadmap
02
Plan

Work breakdown structure, resource loading, CPM schedule, procurement, and risk planning.

Key Deliverable:Level-3 baseline schedule, procurement schedule, risk register
03
Execute

Skilled crews, certified welders, and dedicated supervisors working to approved procedures.

Key Deliverable:Daily progress logs, weld traceability logs, HSE tool-box talks
04
Verify

Inspection and test plans (ITP), non-destructive testing (NDT), punch-listing, and QA/QC.

Key Deliverable:NDT reports (RT/UT/MPT), hydrotest charts, QA/QC punch lists
05
Commission

Systematic pre-commissioning, cold loops, hot commissioning, and start-up support.

Key Deliverable:Loop sign-offs, line flushing certificates, performance run logs
06
Hand Over

Complete as-built dossier, client team training, and post-handover warranty support.

Key Deliverable:As-built redlines, O&M manuals, warranty dossiers, final completion certificate
The QUAD Advantage

Why Choose QUAD International

Proven technical leadership, integrated single-source capability, and unwavering integrity.

Up to 300 MMSCFD Track Record
Field-Proven Expertise

Hands-on leadership experience across major gas RMS stations (up to 300 MMSCFD), power plants, and oil refineries across Bangladesh.

Turnkey Simplicity
Integrated Delivery

Engineering, international procurement, mechanical construction, and final commissioning under one single accountable roof.

Zero-Harm Culture
Safety & Quality

Documented HSE management and rigorous QA/QC inspection regimes applied systematically on every site without compromise.

Dedicated Point of Contact
Transparent Management

Clear daily/weekly communication, transparent cost accounting, milestone reporting, and an assigned senior project coordinator.

Clean Energy & HVAC
Future-Ready Solutions

Integrated capabilities spanning clean solar energy, smart industrial HVAC, and international material sourcing for modern facility needs.

Sector Coverage

Industries We Serve Across Bangladesh

Engineered compliance, uptime, and execution efficiency across heavy process plants, energy infrastructure, and commercial facilities.

Oil, Gas & Refining

Refinery process units (HDS, CRU), storage tankage, high-pressure gas regulating stations, and plant piping.

Key Applications:
Crude Distillation
Gas RMS Stations
Piping & Tank Farms
Refinery Turnarounds
Power & Energy

Combined Cycle Power Plants (CCPP), captive power units, gas metering trains, and utility-scale rooftop solar PV.

Key Applications:
CCPP Turbines & Generators
Fuel Gas Skid Conditioning
Solar Rooftops
BESS Storage
Industrial & Manufacturing

Heavy manufacturing facilities, fertilizer factories, cement plants, steel mills, and chemical processing facilities.

Key Applications:
Process Piping & Skids
Cooling & Industrial HVAC
Material Import
Heavy Machinery Erection
Commercial & Institutional

Engineered solar PV installations, VRF air conditioning, and ventilation for corporate offices, shops, and institutions.

Key Applications:
Corporate Headquarters
Commercial Solar Net-Metering
VRF Climate Systems
PPM Maintenance
Zero-Compromise Standards

HSE & Quality Commitment

QUAD International is firmly committed to safe work practices, environmental stewardship, and consistent, auditable quality across every project. Our teams operate under approved Method Statements, Job Safety Analyses (JSA), Permit-to-Work (PTW) protocols, and Inspection & Test Plans (ITP) aligned with ASME, API, and national statutory requirements.

Health & Safety Excellence

Strict daily toolbox talks, comprehensive PPE enforcement, certified rigging gear, and zero tolerance for unsafe acts on active industrial sites.

Compliance Protocols:
Permit to Work (PTW)
Hazard Identification (HAZID)
PPE Compliance
Incident-Free Target
Documented QA/QC Assurance

Every weld, hydrotest, and alignment is documented with full traceability, calibration certificates, and third-party NDT verification.

Compliance Protocols:
ASME BPVC Code Compliance
ASME B31.3 Piping Protocols
API RP 582 Guidelines
NACE MR0175 Sour Service
Environmental Responsibility

Responsible containment of fuels, waste lubricants (ULO recycling expertise), leak minimization, and advancing clean rooftop solar adoption.

Compliance Protocols:
Chemical Spill Protocols
Clean Energy Transition
Energy Efficiency Optimization
Waste Minimization
Direct Engineering Consultation

Contact Technical Leadership & Submit Project Scope

Consult directly with our leadership for turnaround mobilization, ASME code welding feasibility, high-pressure gas RMS skids, or turnkey solar PV proposals.

MS
Mohammad Saiful Islam

Co-founder & Project Coordinator

Mobile & Technical Line:
+880 1673 789551+880 1828 080970
Official Email:quadint.bd@gmail.com
Headquarters:

415 Faydabad Dokkhin Para, Faydabad Madrasha, Dokkhinkhan, Dhaka-1230, Bangladesh

Operating Hours:

Saturday – Thursday: 9:00 AM – 6:00 PM (GMT+6)

24/7 Rapid Emergency Breakdown & Turnaround Support

Direct WhatsApp Channel
Confidential Engineering Review

Tender drawings, specifications, and scope descriptions are handled under non-disclosure protocols.

Submit Request for Quotation (RFQ)

Specify your project parameters. Our engineering leads will review and respond with a formal method statement and cost estimate.