曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
The non-slip requirement for helidecks also includes all the helideck markings. Therefore, these should be applied using a specification similar to the helideck surface.
9.7.4 Helideck Landing Nets
9.7.4.1 General Requirements
Generally, helideck landing nets should be fitted on all helidecks on offshore installations and vessels operating on the UKCS. Exceptions can be made, subject to BHAB Helidecks acceptance, for some fixed installation landing nets to be removed where the helideck meets the ongoing friction requirements specified in CAP 437.
The removal of helideck nets is covered in detail in Section 9.7.6.
9.7.4.2 Main References
CAP 437, Section 3.8.
9.7.4.3 Helideck Net Specification
The helideck net should be manufactured from sisal rope (not nylon) and tautly stretched with knotted or locked splice joints. Rope and mesh dimensions are specified in CAP 437. It should be noted that, generally, helideck nets are initially manufactured as a square assembly.
Sometimes it may be found that the helideck is of hexagonal shape and the position of markings prevents the setting down of a square net in a manner that allows proper positioning, fixing and the use of tensioning devices. Where this is the case, the shape of the net should be altered. To ensure that only proper modifications are made to the basic net construction, the supplier should make any changes to the shape of the net.
9.7.4.4 Fitting and Routine Maintenance
The net should be maintained in good condition, adequately tensioned, and positioned to cover the aiming circle completely, while leaving the name identification, helideck size and allowable mass markings outside the netted area.
As a general guide, it should not be possible to raise any part of the net more than approximately 250 mm above deck level when applying a vigorous vertical lift by hand. The importance of maintaining adequate net tension, despite regular changes that occur due to water saturation and drying–out cannot be over-emphasised. It is essential to ensure that it is never possible for the helicopter’s undercarriage to become trapped.
9.7.5 Helideck Net Fixings
When a helideck landing net is fitted, fixings should be installed to secure the net properly and an adequate net tensioning system provided. The fixings should be designed and dimensioned so that the tension strops lay flat on the helideck surface. The sole use of ropes is considered an inadequate means for tensioning the net.
It is preferable for the helideck net fixings to be fixed equidistant around the perimeter of the helideck, except where they would present trip hazards at the head of access stairways onto the helideck.
Examples of different types of fixings are shown in Figures 9.3 to 9.6. They may be:
.
Simple ‘loop’ or ‘hook’ bar fixings welded between the deck surface and upstand, or
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(55)
