Estate Service Asset - PDO
Estate Service Asset - PDO
Estate Service Asset - PDO
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Petroleum Development Oman<br />
<strong>Estate</strong> <strong>Service</strong>s <strong>Asset</strong><br />
Environmental Assessment<br />
2002 Review and Update<br />
Table 3.1: Inventory of Air Conditioning Units Used<br />
Type of System Areas Tonnage Refrigerants Used<br />
Chilled water units Large buildings 80 – 310 R-134A, R-407C and R-411B<br />
Central spilt ducted system All 5 – 15 R-411B<br />
Package unit Mainly industrial area 5 – 15 R-411B<br />
Room split unit All 1 – 2.5 R-411B<br />
Window mounted units All 1 – 2 R-22<br />
Notes:<br />
1. R-134A and R-407C are hydro-fluoro-carbon based refrigerants with zero ozone depletion potential.<br />
2. R-411B is a hydro-chloro-fluoro-carbon blend refrigerant with 0.05 ozone depletion potential, but more energy<br />
efficient than R-22.<br />
3. R-22 is also a hydro-chloro-fluoro-carbon blend refrigerant with 0.045 ozone depletion potential, but less<br />
energy efficient than R-411B.<br />
4. In comparison, R-12, a chloro-fluoro-carbon based refrigerant has 4.0 ozone depletion potential.<br />
Consequent to <strong>PDO</strong>’s corporate policy of phasing out of ozone depleting substances<br />
(ODS), the chloro-fluoro-carbon (CFC) based refrigerants have been progressively<br />
replaced by ozone friendly refrigerants such as hydro-chloro-fluoro-carbon (HCFC)<br />
and hydro-fluoro-carbon (HFC).<br />
<strong>Estate</strong> <strong>Service</strong>s are responsible for the provision and maintenance of refrigeration<br />
units used throughout the MAF and RAH areas. This includes both large refrigeration<br />
units used for the restaurant kitchens and smaller units used in residential dwellings.<br />
Once air conditioning and refrigeration units become redundant, <strong>Estate</strong> <strong>Service</strong>s<br />
transfer the units to <strong>PDO</strong>’s internal supply department who auction the working units<br />
to external businesses. In this respect <strong>Estate</strong> <strong>Service</strong>s are not responsible for the final<br />
disposal of these units and the corresponding ozone depleting gases. If, for<br />
maintenance purposes, a particular unit requires degassing, recycle/recovery kits,<br />
equipment, apparatus are used which transfer the refrigerant gases to a waste cylinder.<br />
3.3.4 Electrical Power Supply<br />
The electrical power for <strong>PDO</strong> is supplied by the Ministry of Housing, Electricity and<br />
Water’s (MHEW) from the Al Falaj Power Station. The power is supplied to the main<br />
intake sub-station in MAF at 33 kV, and stepped down to 11 kV. From there, the<br />
power is distributed throughout <strong>PDO</strong>’s MAF operations, RAH residential areas and<br />
several third party operations (including BP, Shell, ORC and other small commercial<br />
operatives) via secondary transformers, where the voltage further stepped down to<br />
415 V for utilities and 220 V for residential use.<br />
<strong>Estate</strong> <strong>Service</strong>s are responsible for managing the maintenance of all electrical<br />
distribution equipment including cabling, transformers, switchgear etc. Of particular<br />
concern with respect to the environment is the use of transformer oils that contain<br />
©HMR Environmental Engineering Consultants C 3- 7<br />
Oman’s Environmental Consultancy<br />
HMR\1501\<strong>Estate</strong> <strong>Service</strong>s