6.15-drains-system-design-philosophy.pdf

KCP-GNS-PCD-DPR-0007 Rev.: 02

Project Title: Kingsnorth Carbon Capture & Storage Project Page 1 of 5

Document Title: Drains System Design Philosophy

Kingsnorth CCS Demonstration Projec t The information contained in this document (the Information) is provided in good fai th. E.ON UK plc, i ts subcontractors, subsidiaries, affi l iates, employees, advisers, and the Department of Energy and Cl imate Chan ge (DECC) make no representation or war ranty as to the accuracy, rel iabil i ty or completeness of the Information and neither E.ON UK plc nor any of i ts subcontractors, subsidiaries, affi l iates, employees, advisers or DECC shal l have any l iabil i ty whatsoever for any direct or indirect loss howsoever arising from the use of the Information by any party.

Drains System Design Philosophy

Table of Contents 1.0 Scope and Functional Requirements ............................................................ 2

2.0 Assumptions ...................................................................................................... 2

3.0 Design Requirements ...................................................................................... 3 3.1 Helideck Drains ............................................................................................. 3 3.2 Other Drainage Systems ............................................................................. 4 3.3 Dense Phase Operation Drainage Requirements ................................... 5

4.0 Mandatory References .................................................................................... 5

5.0 Supporting References .................................................................................... 5





1.0 Scope and Functional Requirements

This philosophy defines the Drains System infrastructure for the Kingsnorth offshore facility for the Gaseous Phase period of operation. The conceptual requirements for the Dense Phase period of operation are given in outline form only. Outline design requirements for the helideck drainage are covered, as are the facilities grey and black water design requirements. Black water is the discharge from WCs or urinals. Grey water is all other waste waters.

2.0 Assumptions

2.1 No fuel gas will be routed to the facility during the Gaseous Phase of operation and diesel or lube oil will be the only sources of hydrocarbon on the facility.

2.2 However, areas on the facility that contain carbon dioxide must

be adequately segregated from enclosed areas due to the risk of asphyxiation from carbon dioxide.

2.3 There will be no requirement for any Closed Drains System on

the facility. 2.4 It is assumed that a grated deck will be used for the facility and

that rainwater will be unable to collect on any of the deck areas. 2.5 It is assumed that the consumers of lube oil will only be relatively

small pumps; as a result, any leaks from these leak sources will be very small and would be accommodated by drip trays.

2.6 It is to be assumed that the drainage facilities are for a Normally

Unmanned Installation. 2.7 Accommodation facilities on the asset will be for emergency stay

only. 2.8 It is assumed that the black and grey waters from the

accommodation will be adequately segregated and that these





will be separately discharged overboard without any pre-treatment.

2.9 It is to be assumed that rainwater will be collected from roof

areas (e.g. temporary refuge, equipment room etc.) and will be discharged overboard directly.

2.10 The hydrocarbon and water dewpoint specification for any

hydrocarbon gas, possibly used during the Dense Phase mode of operation, will be such that liquids will not be formed in any offshore fuel gas conditioning equipment that is required for any offshore CO2 heating system. If necessary, additional fuel gas conditioning will be carried out onshore.

3.0 Design Requirements

3.1 Helideck Drains

3.1.1 Helidecks should be designed to remain free from standing water and fuel accumulations at all times

3.1.2 The Safedeck concept, which ensures minimum surface water

retention due to perforated surface design, is to be utilised. Safedeck is a concept which utilises a tight meshed (porous) aluminium deck that ensures that liquids are inherently drained away from the helideck surface.

3.1.3 The drainage system is to discharge directly to sea in a manner

that provides adequate protection to the installation. 3.1.4 The helideck is to have adequate containment (within the

confines of the helideck) of burning aviation fuel. 3.1.5 The design of the helideck is to ensure rapid and safe disposal

of any liquids (rainwater and/or helifuel) flowing onto the landing surface.

3.1.6 The potential for drain blockages is to be minimised using an

adequate number of debris traps. These traps are to be removable to facilitate cleaning and maintenance.





3.2 Other Drainage Systems

3.2.1 Small rain shelters will minimise water falling into any local drip pans for those drip pans that are in outside areas. This would be used to minimise the possibility of lube oil overflowing from these drip pans.

3.2.2 The volume available in the local drip pan will be at least twice

the volume of any lube oil inventories that could accidentally drain/leak into them.

3.2.3 A separate drains collection system will not be necessary and

that any small drips will accumulate in the drip pan and will then be either mopped up when the opportunity arises or will be drained into a separate container via a drain plug situated in the base of the drip pan.

3.2.4 During the detailed design of the layout and sizing of the

drainage system for the Gaseous Phase mode of operation, adequate consideration is to be given to the operational and drainage requirements of the Dense Phase mode of operation.





3.3 Dense Phase Operation Drainage Requirements

3.3.1 In the Dense Phase mode of operation, there is the possibility that hydrocarbon gases could be brought onto the facility for powering direct fired heaters etc. This could mean that areas that were once defined as Safe could be re-designated as Hazardous Zones i.e. any area where an explosive mixture could possibly occur.

3.3.2 It is not anticipated that there will be any hydrocarbon drainage

requirements from the areas designated as Hazardous Zones, however, their drainage systems must be totally segregated from drainage from Safe areas.

3.3.3 Rainwater drainage from the areas designated as Hazardous

Zones must be totally segregated from drainage from Safe areas.

3.3.4 A closed drains system will not be required as pressurised

hydrocarbon liquids will be in very small quantities (refer to assumption 2.10 above).

4.0 Mandatory References

5.0 Supporting References

CAP 437, Offshore Landing Areas Guidance on Standards

6.15-drains-system-design-philosophy.pdf

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