Crane access

Equipment-handling faciUties include any device used to convey or temporarily support equipment, or provide access for plant maintenance, eg, portable ladders, davits, A-frames, monorails, forklift vehicles, and cranes. 

Layout considerations include avoiding crane lifts over operating equipment, especially equipment that contains hazardous materials, and, in particular, hazardous materials held under pressure or high temperature. Allow space for maintenance access without damage to other equipment. Apply risk management concepts to the layout and siting. 

Floor type or cahhv. The floors of these booths are at or very near to the facility flo >r level. They are often very large to accommodate very large workpieces. In some cases, these booths may have flexible or hydraulically movable walls or roof to ensure access to the booth bv a crane (see Fig, 10.41. ... 

The potential for interference with the normal operation and maintenance of a process vessel is high. A major design effort is required to overcome this disadvantage. All aspects of the process vessel operation must be considered. Lines of sight for process vessel and crane operators, access for crane-held ladles and buckets, process vessel movements, and maintenance access must be accommodated by the enclosure design. This is more easily achieved in a new installation. 

Air Curtain and Exhaust Off-Take Air curtain design and exhaust offtake location are very important considerations. The air curtain is applied on roof openings that are typically 2 to 3 m wide and used for crane rope access. The opening may extend over the length of the enclosure and should, therefore, be served by two sets of independently operated doors— one for tapping and one for charging. This feature minimizes the pen area when one of the two events occurs. 

Access for initial construction and maintenance is a necessary part of planning. Space should be provided for repair and replacement equipment such as cranes and forked trucks, and specialized items such as snow removal equipment, as well as access ways around doors and underground hatches. 

Maintenance considerations associated with each building, process area and equipment. Consider (a) access for cranes and trucks (b) work space for local repairs (c) operating conditions of adjacent parts of process to allow local repairs. 

With the basic rig layout defined, the ancillary equipment may be determined and laid out adjacent to the structures in place. Usually the access is determined where casing, mud and other equipment may be delivered without disturbance of the infrastructure. In the case where a crane (or forklift) is used, this may... 

Because of maintenance of flare tip on elevated flares (and even some open ground and enclosed ground flares), crane or helicopter required possibly for access. Connection often needed for backup flare system, i.e., portable trailer flare or other temporary flare. 

Drainage areas can be defined by the process fire area, which has been established by the spacing, segregation and arrangement provisions for the facility. Open drainage channels should be used where they will not interfere with the use of the area, i.e., crane access, maintenance activities, etc. They should be designed to minimize erosion, and if excessive velocities are encountered they should be paved. No more than 5 m/s (15 ft/s) velocity should be allowed in paved surface runoff channels or troughs. 

Hydrants should be considered as a backup water supply source to monitors and fixed fire suppression systems. Hydrants should be located on the ring main at intervals to suitably direct water on the fire hazard with a fire hose. Hydrants monitors and hose reels should be placed a minimum of 15 meters (50 ft.) from the hazard they protect for onshore facilities. Hydrants in process areas should be located so that any portion of a process unit can be reached from at least two opposite directions with the use of 76 meters (250 ft), hose lines if the approach is made from the upwind side of the fire. Offshore hydrants are located at the main accessways at the edge of the platform for each module. Normal access into a location should not be impeded by the placement of monitors or hydrants. This is especially important for heavy crane access during maintenance and turnaround activities. 

Crane Co. Chlorine. Available online. URL http //www. resistoflex.com/chlorine graphs.htm. Accessed on July 2, 2007. 

All equipment should be accessible by either crane or lift truck. 

Expense can rise rapidly with poor access to equipment or difficult-to-erect piping. Available crane and construction clearances, access width and location requirements and difficult construction points must be checked for each plant arrangement. In some arrangements, increased structural and piping cost for simpler construction is more than offset by the saving in construction cost. 

Road access is essential for exchanger bundle removal, for tower tray removal, to pumps, for catalyst loading and removal, for crane access to compressors, etc. It is advisable to study the piping layout from this standpoint. Remember that roads... 

Plant layout studies are made by template and model methods, as explained in Chap. 5. Ample space is provided for access by crane or fork truck to heavy equipment requiring repair or replacement and for snow- and ice-removal equipment. Shelters of some kind must be provided for equipment requiring protection from rainfall and snow and/or frequent maintenance and operating attention. Examples of equipment of this nature are centrifuges, compressors, and pumps. A relatively cheap shelter of structural steel, designed for overhead crane and monorail support, with corrugated sheet-metal roof and partially open sides suffices. An example of an indoor-outdoor plant with equipment shelters is shown in Fig. 5-6. 

The incident concerns an item of plant temporarily fitted on the reactor building polar crane carriage with a view to dismantling the access gangway to the crane arch. The gangway is a structure fixed on one of the polar crane beams which it was decided to replace by a simple hooped access ladder in 1988. 

Machinery, including cranes, hoists, and forklifts Public access and perimeter fencing Adjacent facilities Buried cables Overhead cables... 

All piping and pumps are shielded with about 1 ft of concrete, and the valve control handles are extended through the shielding. All instrumentation and controls for maintaining proper process-water temperatures and flows are centralized in the Process Water Building instrument room. Overhead cranes and removable floor slabs provide accessibility- to shielded pipes, valves, pumps, etc. Each pump cubicle is shielded from it neighboring cubicle so that repairs can be made during reactor operation. 

While the manipulator inspection pod was accessible at pile cap level the mandatory pre-entry calibrations were made by clamping the test block to the probe chamber at the three positions necessary for comprehensive response checks of the v iole probe eirray. After calibration the manipulator, with the probe assotibly retracted, was lowered by the pile cap crane into the standpipe. Once seated and... 

Initiating event alternatives 1 and 2 are really the same, possibly differing only in impact velocity when striking a fixed object. Alternative 3 represents a less defined crash of the forklift/cask, which may produce less stress on the cask due to the yielding of the other vehicle. In addition, such an other-vehicle crash is unlikely since access to the transfer route is required to be limited during the actual transfer operation. The cask is not elevated while on the forklift in transit from the ACRR to the HCF. The cask is raised and lowered by crane and positioned for transport in a special carrier basket, previously attached to the forklift tines. In conclusion, the initiating event is chosen to be Forklift strikes a fixed object due to operator inattention or mechanical failure."... 

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