The construction window for the oil, gas and pipeline works is usually tight, but the piping and equipment support how to deal with cryogenic ice still requires a full operational cycle analysis. In the case of piping for steel pipes, valves, compressors modules and site equipment, this is concerned with “how the piping and equipment support will respond to cryogenic ice” and the conditions of control are not the same when the vehicle is empty, fully loaded or when the equipment is parked for long periods. The site should first locate the temporary change in the construction route, which would allow the vehicle to enter the area of potential occurrence in the unprotected area, and then decide on the use of pavements, stubs or approved combinations.
The procurement staff shall submit the site map, vehicle watch and crane model, maximum retroactivity of the legs, spacing of the legs, suspension radius, ground-based allowance for pressure, distance of the gutter from the edge, underground pipeline and post-rainfall status to the request for quotation, and indicate where a temporary change in the construction route may result in the vehicle entering the unprotected area. The programme can be based on the calculation of the straight-line segment, the turning area, the docking position and the surface, respectively. For the whole container procurement, the quantity of the container, the pallet or bundle, the offloading equipment, the destination port and the conditions of storage at the site should also be confirmed in advance. The information review should also limit long-term static, in situ wheeling and unplanned queuing of vehicles and include missing information as items to be identified for quotations and construction programmes.
Figure: Pipe-stuffing of steel pipes, valves, compressors modules and site equipment, with a focus on “How the pipe-stuffing and equipment support respond to cryogenic ice”
The drainage direction, soft spots and support under the plate should be compared before and after the rainfall, and the water should not be enclosed under the plate. The area of the leg pads is determined by the retroactivity of the equipment and the confirmed base load, and no pavement board automatically replaces the approved hanger operating platform. In the event that a temporary change in the construction route has caused the vehicle to enter an unprotected area, the area should be sealed, the floor must be lifted and the drainage should be re-connected; the reason cannot normally be eliminated by cleaning the surface or adding a single sheet. Test-painted records for “plugging and equipment to support how to respond to cryogenic ice” should indicate the starting and ending position, vehicle condition and release conclusions to facilitate review as construction conditions change.
The inspection cycle can be shortened at an early stage of use and then stabilized before adjusting to vehicle cycles and weather. The maintenance staff focused on the mid-legged, full exposure, de-loading, mat deformation, deposition, horizontality, fragmentation of the edges and separation of personnel, as well as on the driver ' s compliance with speed limits and diversion requirements. Any unconfirmed sub-board support, edge instability or foot contact should first be disabled. The inspection form, which revolves around “how the piping and equipment support will respond to cold-temperature ice,” contains a separate list of temporary changes in the construction route to allow vehicles to enter unprotected areas, with an indication of the inspector and the time of return.
The impact assessment cannot be based solely on the movement of vehicles on the same day. The project compares vehicle waiting, trapping, maintenance hours, cleaning time, loss of connection, site restoration area and evacuation cycle, and records weather and traffic simultaneously. The establishment of data around temporary changes in the construction route that would allow vehicles to enter the unprotected area would make it possible to determine the suitability of this option for replication at the next hydrocarbon project. It should also answer whether the “plugging and equipment support how to deal with cryogenic ice” has been improved by calculating the straight-line segment, the turning area, the docking position and the operating surface separately, avoiding a subjective description of the final item.
If the conditions on the ground are different from the assumptions in this paper, the application of the conclusions should be suspended and reassessed. Fuel and gas transport, suspension, recovery and repair are subject to the project programme, equipment manual and statutory requirements. The supplier may assist in matching the product, but the final placement, commissioning and release shall be approved by the responsible party for the project.
The following special verifications should be carried out with regard to the “how the piping and equipment support can respond to cryogenic ice” in conjunction with the piping operation of steel pipes, valves, compressors modules and site equipment: cryogenic management is accompanied by an examination of plate ice, snow pressure, the state of the connector, tyre conditions and changes at the grass-roots level after the freeze. Ice should be cleared in such a way as to avoid fire and sharp shocks, and in the event of an increase in water content after melting, the speed limit and decommissioning thresholds should be reassessed.
On-site implementation of the recommendations: The winter road must not only look for snow, but also identify transparent thin ice and freeze at night after daytime melting. The applicability of salts or melters should be determined in conjunction with material compatibility, environmental requirements and on-site approval procedures.
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