what is the difference between the PE pipe and HDPE pipe.
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There is no difference. Both are usually round, both some times are open top, a silo is a tank. PE API650 Tank Engineer 2007
from : Engineeringtoolbox.comPolyethylene pipes are also classified by the type of material used:PE 32 - low pressure piping systemsPE 40 - low pressure piping systemsPE 63 - medium pressure piping systems - irrigation system - drinking water connectionsPE 80 - gas pipe for natural gas distribution network with pressure rate up to 4 bars - drinking water pipe with pressure rate up to 16 bar - sewers, outfall pipes, industrial pipesPE 100 - high demands piping applicationsThe Minimum Required Strength - MRS - according ISO 4427 for the different materials are:Designation of materialMRS at 50 years and 20oCMpa (bar)PE 10010 (100)PE 808 (80)PE 636.3 (63)PE 404 (40)PE 323.2 (32)
US NEC: The neutral conductor is an insulated grounded conductor used as the current return in a circuit. The color designation for neutral is white. The protective ground (PE, protective - earth) is a non-insultated grounding conductor used to shunt fault current to ground, tripping the protective device. The color designation for PE ground is green. Neutral and PE ground are tied together at the distribution panel. PE ground is also connected to a solid earth ground, such as grounding rods driven into the earth. Downstream of the distribution panel, PE ground is never used to carry operational current. Any current flow on PE Ground, other than parasitic current, is considered a ground fault, which must be corrected. In fact, GFCI (Ground Fault Current Interrupting) breakers will trip when neutral current does not match hot current, an indication of PE ground current flow.
PE stands for Professional Engineer.
Professional engineer requires an exam and is open to anyone with a degree that does not have to be a a Master's. Successful pass of the exam gives youa license to stamp drawings and such that is required in special professions but most not. A Master's degree gives you advance knowledge and courses.