Racking platform

These single satellites are commonly used to develop small reservoirs near to a large field. They are also used to provide additional production from, or peripheral water injection support to, a field which could not adequately be covered by drilling extended reach wells from the platform.  [c.268]

The location of the pipe in the rack is selected to minimize the congestion and eliminate line crossing. If a process line connects two nozzles which are elevated higher than the piperack, then the upper level of the rack is used. Similarly, if the nozzles are both below the piperack, then the lower level rack is used. Other cases in which one nozzle is below and the other above use the least congested part of the piperack. Lines with valves are more easily accessed from the upper level, but require an access platform.  [c.80]

Inherently safer principles also apply to mechanical integrity requirements. Design plant modifications for ease and reduced risk in inspections, code compliance, and maintenance. For example, if one can check the pipe thickness from a platform, it is more likely to be done than if a crane is required.  [c.86]

Jack-up rigs. For drilling in water depths of up to 400 ft (122 m), the legs are cranked downward until they reach the sea floor and then jacked up so that the platform is 15 to 30 ft (4.6 m to 9.1 m) above the surface. Workers often reach the rig by helicopter (left).  [c.912]

Tender Assisted Drilling. In some cases oil and gas fields are developed from a number of platforms. Some platforms will accommodate production and processing facilities as well as living quarters. Alternatively these functions may be performed on separate platforms, typically in shallow and calm water. On all offshore structures however, the installation of additional weight or spaoe is costly. Drilling is only carried out during short periods of time if eompared to the overall field life span and it is desirable to have a rig installed only when needed. This is the concept of tender assisted drilling operations. A derrick is assembled from a number of segments transported to the platform by a barge. All the supporting functions such as storage, mud tanks and living quarters are located on the tender, which is a specially built spacious barge anchored alongside. It is thus possible to service a whole field or even several fields using only one or two tender assisted derrick sets. In rough weather, barge type tenders quickly become inoperable  [c.34]

Safe sampling faciUties are needed at railroad tank car and tank tmck unloading areas to avoid falls, particularly in winter or wet weather. Installation of a weU-designed loading rack with an adjustable platform reduces this ha2ard. Care should be taken so that the car is not jolted by a switching engine or other vehicle during sampling. The same precaution should be taken with tank tmcks the driver should be aware that the sampler is on the tmck and be sure not to move it.  [c.100]

Rake-lifting devices can be manual for small-diameter thickeners or motorized for larger ones. Manual rake-lifting devices consist of a handwheel and a worm to raise or lower the rake mechanism by a distance usually ranging from 30 to 60 cm (1 to 2 ft). Motorized rake-lifting devices typicafly are designed to allow for a vertical lift of the rake mechanism of up to 90 cm (3 ft). A platform-type lifting device lifts the entire drive and rake mechanism up to 2.5 m (8 ft) and is used for applications in which excessive torque is most probable or when storage of sohds in the thickener is desired.  [c.1686]

For drilling in shallow water Arctic environments, there is an added risk from the hazard of drifting ice. Artificial islands need to be constructed to protect the platform and equipment. Because of permafrost, drilling onshore in Arctic regions also necessitates building artificial islands. These usually are built from rock and gravel so that the ground does not become too unstable from permafrost melting around the drill site. To leave less of an environmental footprint, these artificial islands are increasingly being built from ice pads rather than gravel. Because the ice pads are insulated to prevent thawing, the drilling season in some Aixtic areas has been extended to 205 days, and well operations to as long as 160 days. This heightens the chances of single-season  [c.912]

The jack-up platform, which is most prevalent, is towed to the site and the rack-and-piiiion geared legs are cranked downward toward the bottom. Once the legs are stabilized on the bottom with pilings, the platform is raised 30 to 60 ft (9.2 to 18.5 ni) above the surface. Another common fixed rig rests on rigid steel or concrete bases that are constructed onshore to the correct height. The rig is then towed to the drilling site, where the flotation tanks, built into the base, are flooded to sink the base to the ocean floor. For drilling in mild seas, a popular choice is a tender-assisted rig, where an anchored barge or tender is positioned alongside the rig to help with support.  [c.913]

As more offshore exploratoiy operations move into deeper water—in 1997 there were thircy-one deep water rigs drilling in water depths greater than 1,000 ft (305 m) as opposed to only nine in 1990— there is sure to be more growth in the use of senii-submersible rigs and drill ships. In rough seas, semi-submersible drilling rigs are the preferred option since the hull is entirely underwater, giving the rig much more stability. The operational platform is held above the surface by masts extended upward from the deck. Cables are moored to the sea floor, with the buoyancy of the platform creating a tension in the cables that holds it in place.  [c.913]

Another method to increase efficiency is to launch a rocket eastward close to Earth s equatorial plane. It would be additionally accelerated by Earth s rotation, achieving greater payload capability without any extra energy consumption. Small rockets could be launched from an airplane, which makes building expensive launching facilities unnecessary. This concept is currently utilized by the American Pegasus launch system. Larger rockets could take off from floating launchers, such as the San Marco platform, which had been used by Italy for the American Scout rockets in the 1960s. The end of the Cold War allowed the use of existiirg military technology for this purpose. For example, the Russian Navy successfully launched a small satellite by a ballistic missile from a submerged strategic submarine in 1998. The largest floating launch platform was built in 1998 in Norway for the Sea Launch international consortium. It operates from the United States, making commercial launches of heavy rockets jointly built by Russia and Ukr aine.  [c.1074]

A semisubmersible rig (Figure 4-495) can be used in water up to 6,000 ft deep, and provides a drilling platform generally more stable than does a drillship. As on a drillship, a semisubmersible rig is stabilized by a complex mooring and positioning system. Since a major portion of the vessel is submerged, wave action can be minimized. Mooring systems are specifically designed to resist surface forces, and ballast can be preferentially shifted within the vessel to provide stability during rough weather.  [c.1363]

Larger evaporators (see Figure 15.9) will also be mounted at high level if possible, to save ueful floor space. Owing to the weight, they must be supported from the outer structural roof by tie-rods passing through the insulation. Access gangways are needed in the roof void to facilitate maintenance and inspection of piping, valves and insulation. Some stores have the coolers mounted in a recess above the loading bay, providing a maintenance platform. This can only be done where the fans can cover the full length or width of the chamber.  [c.185]

See pages that mention the term Racking platform : [c.20]   
Standard Handbook of Petroleum and Natural Gas Engineering Volume 1 (1996) -- [ c.501 ]