This standard recommended practice details acceptable practices for the design, fabrication,
installation, and maintenance of steel-cased metallic pipelines. It is intended for use by personnel
in the pipeline industry.
The use of cased carrier pipe for pipelines crossing under highways and railroads is common
practice in the industry. The first cased crossings were made using large-diameter pipe. The
carrier pipe was mechanically coupled and pushed through the casing, and the coupling or collars
were in direct contact with it. When coatings came into general use, isolating spacers were made
of hemp rope saturated with pipe-coating enamel. End seals consisting of either concrete or pipe-coating
enamel were poured into each end of the casing. The current practice of installing cased
carrier pipe has changed only slightly since the beginning of its use. External loading of the
carrier pipe has now been eliminated by the installation of heavy-wall casing pipe, and isolating
spacers are used to prevent electrical contact between the casing and the carrier pipe. End seals
are used to keep mud and water out of the annular space between the carrier pipe and casing.
| File Size : | 1
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| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 23 |
| Published : | 03/20/2008 |
