![]() ![]() If lines with different numbers and piping classifications join at a valve, the block valve should be given the higher class.The higher piping class should be carried through the control valve up to the outlet of the downstream block valve and downstream of the bypass valve. ![]() ![]() If the specification of a line changes downstream of a control valve or control station, a new line number with a lower piping class should be assigned downstream of the valve.Whenever the piping class changes, a new line number will be assigned. One line number may indicate more than one line size but not more than one class. This would not be applicable if the piping class does not change. The line number should be continuous from one piece of equipment to the next. This section has general information related to numbering lines. Each company follows its own set of rules when assigning line numbers and line designation.Other examples might be ET for electrical tracing. This example shows steam tracing as the type of heat tracing. This is an optional item and is typically left off if there are no entries on it. Some coatings might be C for cement lined pipe, F for fiberglass, G for galvanized, P for plastic. Other examples might be CC for cold conservation, FP for fire protection or PS for personnel safety. This example shows 2" insulation for the purpose of heat conservation. Once all the primary lines are numbered, secondary lines should be numbered with the same methodology.Ī typical line number or line designation would be as follows:Ģ"HC = Coating or Insulation thickness and function. Assign numbers up to each piece of equipment. If there is no in house process to number the lines, start at the upper left line (on the P&ID) and use that as the lowest number. Typically, a line number will be assigned to a primary flow line and then incremented as it branches. Most companies have their own method of numbering lines. Flow lines should be labeled to show pipe size, line service identification, line number, line material, piping class and the line pressure rating. ![]()
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