WORK INSTRUCTION FOR ABOVEGROUND PIPING DESIGN

Index
GENERAL

Scope and Field of Application
Plant block identification
Measurement Units
References
Abbreviations

ACTIVITIES TO BE PERFORMED

Piping layout
Isometrics
Erection Drawings

PIPING INSTALLATION

Pipe Racks
Pipe Ways
Columns
Vessels and Reactors
Storage Tanks - Atmospheric and/or Low Pressure
High Pressure Storage Vessels
Heat Exchangers
Pumps
Compressors
Steam Turbines
Heaters
Loading Arms
Air Coolers

PIPING COMPONENT INSTALLATION

Manually actuated operation/shut-off valves
Check Valves
Control Valves
Motorized Valves
Actuated Valves with/without Fire Proofing Protection
Actuated Valves with emergency air storage vessels
Safety Valves
Orifice flanges and Annubars
Steam Traps
Service Hoses
Sample connections
Instrument accessibility
Levels
Miscellaneous

Piping Layout
This activity consists to define the layout of the piping present on the Plant. Normally it is
developed using the following operating methods, either singly or combined:

Studies on paper;
3D model.

Studies on paper are generally utilized for the revamping of existing Plants, where only the erection drawings are available, or for the interconnecting or Off-site areas. The performance of this activity involves the solution of problems that are jointed to constraints as safety, cost-effectiveness, functionality and accessibility and dealt (see Paragraph 3).
Normally, Plant process and utilities pipes are installed aboveground, gathering them, as far as possible, in orderly bundles on appropriate support structures, which are called Piperack's. Exceptions are the sewer system sea cooling water, potable water and fire-fighting pipes which are installed below the Plant grade level. For the design of these type of pipes see 3034.00.ED.PI.DCR.50001 ‘Technical Specification for sewer e underground piping network’. The aboveground piping layout shall have a simple and well-organized arrangement, the network configuration shall be in according to Mechanized P&I diagrams, moreover suitable access for operability and maintenance and economic supports shall be provided . The following activities are developed at the same time as the piping layout activities: