Estate Service Asset - PDO

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Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update - Building maintenance - Air-conditioning maintenance - Electrical power supply - Potable water supply - Catering and laundering - Recreational facilities maintenance - Sewage treatment and disposal - Solid waste collection and disposal - Roads and parks maintenance - Miscellaneous services These activities are discussed in the following sections. 3.3.2 Building Maintenance On behalf of the estate services asset, approved contractors provide all the building maintenance services, which include the following: - General building inspection and repair - Furniture inspection and repair - Painting - Pest control - Thermal insulation inspection and replacement Building repairs are limited to minor civil works such as plastering, plumbing, reflooring etc. Furniture repairs comprise of minor restoration works off-site. Painting involves white washing and the application of synthetic paints on walls, roofs, roads etc. Pest control includes the spraying and injection of pesticides and insecticides. Thermal insulation involves the covering of air conditioning ducts and ceilings with glass fibre mats. 3.3.3 Air-conditioning Maintenance Estate services asset is responsible for providing the maintenance requirements for all air conditioning and refrigeration units throughout PDO’s coastal operation. All the buildings (domestic, commercial and industrial) maintained by the estate services asset are air-conditioned. Several types of air conditioning units are used. Table 3.1 provides a brief summary of the different types of air conditioning units used. ©HMR Environmental Engineering Consultants C 3- 6 Oman’s Environmental Consultancy HMR\1501\Estate Services
Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update Table 3.1: Inventory of Air Conditioning Units Used Type of System Areas Tonnage Refrigerants Used Chilled water units Large buildings 80 – 310 R-134A, R-407C and R-411B Central spilt ducted system All 5 – 15 R-411B Package unit Mainly industrial area 5 – 15 R-411B Room split unit All 1 – 2.5 R-411B Window mounted units All 1 – 2 R-22 Notes: 1. R-134A and R-407C are hydro-fluoro-carbon based refrigerants with zero ozone depletion potential. 2. R-411B is a hydro-chloro-fluoro-carbon blend refrigerant with 0.05 ozone depletion potential, but more energy efficient than R-22. 3. R-22 is also a hydro-chloro-fluoro-carbon blend refrigerant with 0.045 ozone depletion potential, but less energy efficient than R-411B. 4. In comparison, R-12, a chloro-fluoro-carbon based refrigerant has 4.0 ozone depletion potential. Consequent to PDO’s corporate policy of phasing out of ozone depleting substances (ODS), the chloro-fluoro-carbon (CFC) based refrigerants have been progressively replaced by ozone friendly refrigerants such as hydro-chloro-fluoro-carbon (HCFC) and hydro-fluoro-carbon (HFC). Estate Services are responsible for the provision and maintenance of refrigeration units used throughout the MAF and RAH areas. This includes both large refrigeration units used for the restaurant kitchens and smaller units used in residential dwellings. Once air conditioning and refrigeration units become redundant, Estate Services transfer the units to PDO’s internal supply department who auction the working units to external businesses. In this respect Estate Services are not responsible for the final disposal of these units and the corresponding ozone depleting gases. If, for maintenance purposes, a particular unit requires degassing, recycle/recovery kits, equipment, apparatus are used which transfer the refrigerant gases to a waste cylinder. 3.3.4 Electrical Power Supply The electrical power for PDO is supplied by the Ministry of Housing, Electricity and Water’s (MHEW) from the Al Falaj Power Station. The power is supplied to the main intake sub-station in MAF at 33 kV, and stepped down to 11 kV. From there, the power is distributed throughout PDO’s MAF operations, RAH residential areas and several third party operations (including BP, Shell, ORC and other small commercial operatives) via secondary transformers, where the voltage further stepped down to 415 V for utilities and 220 V for residential use. Estate Services are responsible for managing the maintenance of all electrical distribution equipment including cabling, transformers, switchgear etc. Of particular concern with respect to the environment is the use of transformer oils that contain ©HMR Environmental Engineering Consultants C 3- 7 Oman’s Environmental Consultancy HMR\1501\Estate Services
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Estate Service Asset - PDO

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