" Good Engineering Practices & Analysis "

[ About Us ]

GEPA Grup is a joint venture of two experienced commissioning companies (EON GRUP and DECOM). It is founded in 2018 and is providing building commissioning and consultancy services through relevant standards in Turkey and other countries.

GEPA Grup has been providing building commissioning services in terms of Mechanical, Electrical, Plumbing, Automation, Low Current Systems, Life Safety Systems, Special Systems (Medical Gas, Nurse Call, Pneumatic Transport System, Queue-Matic system, Helipad System, IPTV, etc..) as well as BMS, Fire & Life Safety design and consultancy services through international standards ensuring interdisciplinary coordination.

GEPA Grup is a specialized company which provides accurate and high-quality services through its expert professionals and offers solutions complying to national and international standards.

[ Mission & Vision ]

Energy Efficiency


Integrated Design and GEP



International Standards & Codes

Up-to-date Information & Technology

Quality and Environmental Awareness

[ Business Associates ]

North America

Mailing Address
16192 Coastal Hwy
Lewes, DE 19958 USA

Turkey, Europe, Asia and MENA

EON Grup Mühendislik Müşavirlik ve Tasarım Ltd. Şti.
Gülbahar Sok. 13/21 Kozyatağı Kadıköy 34742 İstanbul
Tel: +90 (216) 456 74 06 Faks: +90 (216) 455 37 92

DECOM Danışmanlık Mühendislik Ltd. Şti.
Eğitim mah. Eylül Sk. No:5-7/17 Kadıköy 34722 İstanbul
Tel: +90 (216) 450 13 13 Faks: +90 (216) 450 13 13

[ Services ]


1.1. What is Building Commissioning?
Commissioning is a systematic process of ensuring that all building systems perform interactively according to the contract documents, the design intent and the owner’s operational needs. This is achieved ideally by beginning in the pre-design phase with design intent development and documentation, and continuing through design, construction and the warranty period with actual verification through review, testing and documentation of performance. The commissioning process integrates and enhances the traditionally separate functions of design peer review, equipment startup, control system calibration, testing, adjusting and balancing, equipment documentation and facility staff training and adds the activities of documented functional testing and verification.

1.2. Building Commissioning Guidelines
Building commissioning typically involves four distinct “phases” in which specific tasks are performed by the various team members throughout the construction process. The four phases are pre-design, design, construction, and warranty. As part of the construction phase, commissioning involves functional testing to determine how well mechanical and electrical systems meet the operational goals established during the design process. Although commissioning can begin during the construction phase, owners receive the most cost-effective benefits when the process begins during the pre-design phase at the time the project team is assembled.
A properly commissioned facility can result in fewer change orders during the construction process, fewer call-backs, long-term tenant satisfaction, lower energy bills, avoided equipment replacement costs, and an improved profit margin for building owners once the building is occupied. Commissioning also assures that the building’s operational staff is properly trained and that the operations and maintenance manuals are compiled correctly at project turn-over.

1.3. The Commissioning Stage
1.3.1. Stage 1: Preparation
Will be mainly handled by the Client Cx Team.
After being selected, T&C company Cx will review;
• with the client and the project manager the outline project budget for the T&C Works.
• the outline scope of Works for the commissioning process.

1.3.2. Stage 2: Design
All design drawings and documents in relation to the project should be reviewed by T&C company Cx Team in order to verify that the design includes HSH design standards and complies with all relevant codes and regulations. T&C company shall also verify that the design allows all tests and surveys to be performed for Test and Commissioning

1.3.3. Stage 3: Pre-Construction
Field inspection verification test forms shall be prepared by T&C Company Cx team. The test forms shall be filled in by contractors Cx team under supervision of T&C company Cx team. For that purpose, T&C Company Cx team (authorized engineers) shall visit the site on monthly basis and manage the process and report to the client Cx team.

1.3.4. Stage 4: Construction
Operational test forms shall be prepared by T&C Company Cx team. All tests shall be done by contractors Cx team. T&C company authorized engineers shall accompany and control the process for each equipment / system on a full time manner. T&C company Cx team shall manage the issue log document and report to the client Cx team.

1.3.5. Stage 5: Commissioning of Engineering Services
Functional performance test forms shall be prepared by T&C Company Cx team. All tests shall be done by contractors Cx team. T&C company authorized engineers shall accompany and control the process for each equipment / system on a full time manner. T&C company Cx team shall manage the issue log document and advise the remedial actions and report to the client. Interim commissioning report (subject to post-seasonal checks) shall be prepapred by the T&C company Cx team.

1.3.6. Stage 6: Pre-handover
Contractors Cx team shall prepare and submit the O&M documents, training documents and records, as built projects, commissioning documents to the client. T&C Company Cx team shall control and review the O&M documents, training documents and records, as built projects, commissioning documents.
T&C company Cx team also follows the training program and activities planned by the contractor Cx team and records the activities.

1.3.7. Stage 7: Initial Occupation
Client Cx team shall carry out a survey logging occupant feedback and help new occupants. T&C company Cx team shall advice for fine tuning the building systems and controls to satisfy the actual building load

1.3.8. Stage 8: Post – Occupancy Aftercare
After the initial occupation, the contractor Cx team shall perform the performance tests which could not be performed because of the seasonal reasons and lack of internal load. Those performance tests shall be accompanied, supervised and documented by T&C Company Cx team. Those testing activities shall be performed in two different months. After the post commissioning session, T&C company Cx team shall review post-occupancy, seasonal performance test results and all the necessary fine tuning activities shall be achieved. Final commissioning report shall be prepared by the T&C company Cx team. All Cx teams shall attend lessons learned meetings/workshops and T&C company Cx team shall prepare lessons learned report

1.4. The Commissioning Scope
1.4.1. Mechanical System
• Air Curtains.
• Air Handling Units.
• Boiler Chimney.
• Boilers and Burners.
• Booster Set
• Chillers
• Circulation Pumps.
• Cooling Towers.
• Domestic Water Storage Tanks.
• Expansion Tanks.
• Fan Coil Units.
• Fans.
• Fire Dampers with Fusible Link.
• Fire Hose Cabinets and Fire Department Connections.
• Fire Pumps.
• Flushing & Dosing of Heating and Cooling System Pipelines.
• Flushing of Domestic Water Supply Pipelines.
• Flushing of Firefighting System Pipelines.
• Garden Irrigation System.
• Grease Separator.
• Heat Exchangers.
• Hydrant System.
• Motorized Fire and Smoke Dampers.
• Package Units.
• pH Neutralization.
• Pre-Action Sprinkler Systems & Dry System & Air Compressors.
• Solar Heating System.
• Split AC Units.
• Testing, Adjusting and Balancing.
• Vitreous China Plumbing Fixtures.
• VRF System.
• Waste Water/Drainage Pumps.
• Water Softening and Filtration.

1.4.2. Electrical System
• Busbars.
• Diesel Generators.
• Distribution Boards (inc. Main Distribution Panels, Compensation Panels, ATS Panels MCC Panels, Operation Theatre Panels).
• Earthing Systems.
• Exit&Emergency Lighting System.
• Lighting System.
• Lightning Protection.
• LV Cabling and Power Socket System.
• MV Cabling.
• MV Cubicles.
• MV&LV Selectivity.
• Power Transformators.
• UPS.

1.4.3. Automation and Life Safety Systems
• Building Management System.
• Fire Alarm and Smoke Detection System.
• Fire Alarm and Cause & Effect Matrix.
• Public Address and Emergency Announcement System.
• CO Alarm and Detection System.
• CCTV System.
• Security Access System.
• SCADA Control.
• Jet Fan Automation
• Lighting Automation System.
• HVAC Automation System

1.4.4. Special System
• A/V System.
• Automatic Doors and Barriers.
• Baby Kidnapping System. • Car Park Fans, Jet Fans and CO System.
• Elevators (Report Review).
• Escalators (Report Review).
• Fire Curtains.
• FM200 & Gaseous Fire Protection System.
• Fuel Supply System.
• Helipad System.
• Hood Fire Suppression System.
• Kitchen & Cold Rooms.
• Laundry.
• Master Clock system.
• Medical Gas System.
• Medical Waste Disposal.
• Natural Gas Supply System.
• Natural Gas Leakage Detection System.
• Nurse Call System.
• Photovoltaic Panels.
• Pneumatic Tube Transport System.
• Quematic.
• Reverse Osmosis (Hemodialysis and Steam Sterilization).
• SMATV System.
• Steam Generator.
• Telemedicine System.
• Telephone and Data System (Report Review).
• Trigeneration.


2.1. Fire and Life Safety Consultancy Services
Fire protection services for buildings need to be designed with special and traditional solutions during the project phase. The approach is to fully fulfill the requirements of the project according to international standards (NFPA, EN, BS). Fire protection, life and property safety of buildings are examined through constructional, architectural, electrical and mechanical systems.

2.1.1. Fire and Life Safety Consultancy Scope Passive Protection Systems: Fire Extinguishing Systems with Human Means Automatic Fire Extinguishing Systems Fire Detection and Warning System Auxiliary Protection Systems

2.1.2. Construction Stages of Fire and Life Safety Works Architectural Design Review and Fire and Life Safety (FLS) Consulting Service Interdisciplinary Coordination of Design Groups Consultancy Service: Fire Safety Planning Works Consulting Services of Field Application Projects and Material Inspection Site Application Audit


3.1. Commissioning
• Work Schedule
• Review Owner’s Project Requirements (OPR)
• Architecture Projects Review reports and drawings.
• Mechanical Projects Review reports and drawings.
• Electrical Projects Review reports and drawings.
• Review of Technical Calculations.
• Cx Plan
• Risk Matrix
• Responsibility Matrix
• Documentation Matrix
• Tests Method of Statement
• Issues and Resolution Log
• Operation and Maintenance Manuals Log
• Training Log
• Warranty Log
• Consents and Licenses Log
• Test Result Report
• Mountly Progress Report
• Legionella Report
• Final Commissioning Report.

3.2. Fire & Life Safety Consultancy
• Fire safety Groups Design Report
• Field Application Reports.
• Fire Evacuation plans, Building Fire Resistance and Zoning Drawings.
• Fire Matrix.

3.3. Automation and Low Current Systems Consultancy
• BOQ Lists for Field Equipment
• Point List
• Valve Sizing Table
• Calculations and Tables
• Technical Specification Document
• Sample Templates of Factory AcceptanceTest for Panels
• Installation Details (Do and Dont)
• System Topology
• Principle of Operation Schematics
• Operational Sequences Document
• Performance Test Templates

[ Our Quality Policy ]

Our main philosophy is to provide accurate, effective commissioning and consultancy services through international standards. The consciousness of being effective, responsive, productive and creative for continuous development is the essential principal for all employees. Using the necessary tools, equipment; our expert staff perform through innovative approaches in accordance with quality standards and customer requirements, to keep the standards of our services at maximum level and to be able to give that kind of service continuously.

Conclusively, our goals are:
• To increase the quality of services and to increase our work performance continuously by using our resources the most effective way,
• To improve the employees' development continuously through supervising their satisfaction and training needs
• To aim the development of our projects in accordance with national and international quality standards and customer requirements,
• To maintain a systematic, customer-oriented management style which is continuously innovative and developing with proactive approach
• To associate GEPA Grup and its employees with "Reliability" and "Superior Quality" by the customers,
• To obtain the continuity of our services in accordance with the customer requirements, these goals and principles through effective communications
• To make intensive efforts for the preservation and continuity of reliability and prestige that have been developed through our work with all institutions and organizations will continue to be our main philosophy.

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