case report offshore >
Contractor: Lamprell Owner: Single Buoy Moorings
Flash Gas Compressor Barges (FGCB) 3,4 and 16
OUTSIDE 35 C HUMIDITY 90%
22ยบ C
Inside
PROVIDED BY HEINEN & HOPMAN
Heating
Ventilation
Air Conditioning
Refrigeration
DESCRIPTION OF THE PROJECT AKCO awarded a letter of intent to the consortium of Single Buoy Moorings Inc. (SBM) and Siemens on 29th July 2004, followed by a contract award on 30th September 2004 for the Design, Engineering, Procurement and Fabrication (EPF) of three Flash Gas
KEY FEATURES Length: 95.0 m Breadth: 16.0 m Height: 33.5 m Weight: 3,085t Design Life: 40 years Maximum ambient/ Design Temperature: 35°C / 65%RH Minimum ambient Design Temperature: -23°C H2S Containment: 23% Handle the associated gas relevant to a Plant capacity of 225,000 BOPD
CHALLENGES SBM needed a well-known HVAC specialist in the field. Heinen & Hopman was invited into the project by Lamprell to re-evaluate the basic engineering and ultimately come up with a fixed design. The main criteria the HVAC had to meet were: 1. Safety (Zone-1 operation, pressurized rooms, blast resistance and H2S filtering). 2. Reliable and easy use. 3. Easy maintenance due to unmanned operation. 4. A 40-year lifespan. 5. GOSH
Compressor Barges (FGCB) 3, 4 and 16 to be used for the Kashagan Field Development in the northern part of the Caspian Sea offshore Kazakhstan.
SOLUTIONS As requested, special attention was given to electrical rooms in relation to H2S filtering. The goal was to make sure that no H2S or other toxic sour gas mixtures can enter these spaces, ensuring the safety of maintenance crews and extending the lifespan of the equipment. Heinen & Hopman was also asked to focus on the electrical rooms related to blast-proof 2-bar static. All main intakes and outlets were executed with SS316L blast-proof dampers. Special attention was also given to any components that might fly around during an explosion/blast. Items such as ducting, air handling units, condensing units and filter units required special engineered supports and framework to ensure that components would not spread all over a barge in case of an explosion. The main consideration was that, while deformation and damage could be allowed to occur, equipment had to stay in its mounted position. All components were to be suitable for Zone-1 classification and have been certified as such. All materials have been selected for this harsh environment or have been protected to guarantee the same by means of special coating methods. All electrical rooms are pressurized at a
Contractor: Lamprell Owner: Single Buoy Moorings
minimum positive pressure of +50 Pa with respect to the outside atmosphere so as to ensure that no contaminated outside air can enter. Sufficient redundancy is foreseen for all essential HVAC systems, cooling, heating, mechanical ventilation, filtering, control, etc. Normal ventilation ducting would not have fitted in the compressor hall if common practice design criteria for ducting had been used. This is why Heinen & Hopman proposed, delivered and installed a directional flow ventilation system, which allowed for considerably smaller dimensions of the ducting system. This was needed to ensure that cooling air would also reach dead spots inside the compressor hall so that no uncontrolled heat loads would occur.
SCOPE OF SUPPLY Compressor hall & LER Air intake systems for HVAC Air Handling Units 3x Refrigeration equipment 3x H2S filtering units 2x Centrifugal fans 2x Axial fans 6x Air filters Dampers Sound attenuators Supply & extract ornaments HVAC control systems HVAC instrumentation
All Zone-1 Eexde-IIB-T3 Total air volume approx. 123,000m3/h Total cooling capacity approx. 325 kW Dirivent system Total air volume approx. 150,000m3/h Including blast dampers
SCOPE OF WORK Consultancy Design & Engineering Project management Custom built production Supervision Commissioning
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