API RP 2L-2006 pdf free download

API RP 2L-2006 pdf free download.Recommended Practice for Planning, Designing, and Constructing Heliports for Fixed Offshore Platforms.
3.3 fixed offshore platform: A platform extending above and supported by the sea bed by means of piling, spread footings, or other means with the intended purpose of remaining stationary over an extended period. 3.4 flight deck: Flight deck area is the portion of a heli- port surface provided for helicopter takeoff and landing. 3.5 gross weight: Gross weight is defined as the certi- fied maximum takeoff weight of the helicopter for which the heliport is designed to accommodate. 3.6 ground cushion: An improvement in flight capabil- ity that develops whenever the helicopter flies or hovers near the heliport or other surface. It results from the cushion of denser air built up between the surface and helicopter by the air displaced downward by the rotor. 3.7 ground cushion area: Ground cushion area is the solid portion of a heliport surface provided for proper ground cushion effect. This area may be only the flight deck or the flight deck plus its perimeter safety shelf. 3.8 helicopter: A rotary wing aircraft which depends principally for its support and motion in the air upon the lift generated by one or more power-driven rotors, rotating on substantially vertical axes. 3.9 heliport: An area on a structure used for the landing and takeoff of helicopters and which includes some or all of the various facilities useful to helicopter operation, such as parking, tiedown, fueling, maintenance, and so forth. 3.10 hover: A flight characteristic peculiar to helicopters which enables them to remain stationary above a fixed point. 3.11 multi-helicopter heliport: A heliport designed for use by more than one helicopter at any one time. 3.12 overall helicopter length: The overall length of a helicopter is the distance from the tip of the main rotor blade to the tip of the tail rotor when the rotor blades are aligned along the longitudinal axis of the helicopter. 4 Planning 4.1 GENERAL 4.1.1 This section serves as a guide for the design and construction of heliports on offshore platforms. Adequate planning should be performed before actual design is started in order to obtain a safe and practical heliport with which to accomplish the design objective. Initial planning should include all criteria pertaining to the design of the heliport. The safety departments of the helicopter companies can provide valuable assistance during the planning phase. 4.1.2 In planning the heliport, consideration should be given to the helicopter’s gross weight, landing load distribu- tion, rotor diameter, overall length, and landing gear config- uration, as well as ground cushion area and the number of helicopters to be accommodated by the heliport. 4.1.3 Design criteria presented herein include operational requirements, safety considerations, and environmental aspects which could affect the design of the heliport. 4.2 HELICOPTER SELECTION Considerations for selecting the helicopter for heliport design are: a. Distance from onshore staging areas or helicopter bases. b. Proximity to other offshore heliports, on either satellite structures or adjacent field structures. c. Status as to whether the platform is manned or unmanned and with or without living quarters. d. Helicopter transportation requirement for the platform. e. Crew change requirements. f. Night helicopter needs, whether routine service, medical removal, or emergency evacuation. g. Environmental conditions. 4.3 OPERATIONAL CONSIDERATIONS The following are the operational considerations: 4.3.1 Function The function of the heliport should be classified as either single-helicopter or multi-helicopter operation although a heliport designed for one large helicopter may accommo- date two smaller helicopters if the minimum clearance requirements are met.