INTRODUCTION
- Pipe-Rack Considered as Main Artery of a process plant. Basically Overhead piping supported on steel or concrete bents.
- Located in the central part with branches to the sides.
- To be Designed, Layed out & Erected first along with electrical cable trays, drainage trenches, sewers, & roads. After which the equipment are to be placed.
- Pipe racks carry process & utility piping and may include instruments & cable trays also.
- Pipe rack structure is a major item and is often fire proofed. It is also an important cost factor.
- Lot of care, planning & coordination with other groups needed as mistakes can be very costly.
- Pipe racks are tailor-made to a particular plant.
- Process lines are usually on a lower level, while utility lines are on the top level.
- Instrument & electrical trays are either with utility level or on a separate topmost level.
- Many times made of concrete or steel.
- Pipe ways are classified by their relative elevation to grade.
TYPES
- Pipe Racks are Above ground piping supported on concrete sleepers at grade level. (Off site areas where equipment is well spaced out)
- Trenched Piping are Below ground piping laid in connection trenches.
- Costly and usually undesirable; unless trenches are wide, shallow and well vented, heavy gases may settle and create a fire hazard through the length of the trench.
- For these reasons, only pump out lines, chemical sewers or chemical drain collection systems are sometimes placed in trenches and routed to a pit or underground collection tank.
- Underground Piping : Piping direct buried below ground level. Due to costly maintenance and the usually corrosive nature of soil, this method of routing is generally reserved for sewer and drain lines.
- In some plants, especially in cold climates, cooling water lines are buried below the frost line. This should be determined at the beginning of a job, is generally a Client request.
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