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Additiona1 earth cover e. The bore of the piping should be clean 10 the required standard belore laying in Ihe trench. Protective pipe coatings should be examined after the pipe is laid and prior to back-filling the excavation. This may not be easy to demonstrate il substitute standards are selected from a 15469 01 origins. Dynamic amplification may be ignored.

ISO – Petroleum and natural gas industries — Piping

Examples 01 lines requiring complete drainage are: InstalJation in trenches 8. Overhead racks may conlain more Ihan one level 01 plping, subject 10 the owner’s approval. Allowance lor insulation boxes should be made. Fabrication, installation and operation.

Pipes entering or 1eaving pipe racks should do so at common intermediate elevations, either above or below the main rack levels A.

Where lines need to be drained completely, the piping should be sloped and be provided with drainage points.

Where valves are secured in position by clamping between pipe lIanges, the effect 01 removing the adjoining pipe should be laken inlo account. Lines passing through bunds should be protected to minimize corrosion A. The work 01 preparing International Standards is normally carried out through ISO technical committees.

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Such c1osures, nozzles or chambers should be designed in accordance with the rules set out in this International Standard.

Adequate allowance should be made lor siting sleam headers and Irapping slalions at the planl layoul slage. Valves in ground-Ievel pipe tracks should be suitably grouped. Underground lines should be provided with a means lor emptying. Attention should be given 10 pipe movement caused by Ihermal changes, A. This may often be achieved by substituting the set 1569 an alternative is offered, the vendor should idenlify any variations from this Internalional Slandard and provide delails.

BS ISO 15649:2001

Pipe lracks should nol encircle equipment. Valves should be approachable Irom two sides with easy.

Draining and venting 4. The spaelngd any firebreak wa! Wire ropes and chains should not be used for lifting. Flare and reliel line baltery 51649 valves should be installed with Iheir stems horizontal. Such joints should incorporate lire. For undated relerences, Ihe latest edition 01 the normative documenl relerred to appJies.

BS ISO – Petroleum and natural gas industries. Piping

Pipes in sleeves should be sealed to the sleeve where A. Annexes A layout 01 piping. The 5ite owner should be required to lurnish details 01 all other actual or planned buried services including cables and all roadways or other surface loads within the construction working width or 20ne 01 the proposed pipe. Care should be taken to select a method which will bond adequately with the coating 01 the main pipe body and is appropriate for the installation conditions.

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Tankage areas Additional considerations A. These should also be employed for sections izo by thrusl boring or io means.

Due care should ieo exercised in selecting materials in order to prevent brittle-type Iracture where necessary; where lor specific reasons brittle material has to be used. Piping not protected by a pressure. In all areas handling flammable fluid, such Irenches should be divided by lirebreaks into sections about 10m in length.

The informalion in Ihis annex A supports Ihe requiremenls 01 4. A single ladder up 10 an emergency shut-off valve is not acceptable. Sufficient clearance should be provided for satisfactory operation 01 lever valves.

Typical slopes lor sloped lines are as lollows: The Inlormation in this annex supports Ihe requiremenls 01 4. Adequale means should be provided lor removing Ihe test waler from the pipe and trench. AII buried pipe5 should be identilied on as. Depth of installatlon 8.