pressure loss due to friction\nis zero when there is no water flowing\ncannot exceed 20 psi\nis independent…

pressure loss due to friction\nis zero when there is no water flowing\ncannot exceed 20 psi\nis independent of pipe length\nis independent of pipe diameter\nis independent of pipe wall smoothness\nquestion 26\nto meet common standards, we have to inspect all of the following except\nfoundation irrigation systems\nwater heating equipment\nnormal operating controls for water heaters\nautomatic safety controls for water heaters\nchimneys and flues and vents for water heaters

pressure loss due to friction\nis zero when there is no water flowing\ncannot exceed 20 psi\nis independent of pipe length\nis independent of pipe diameter\nis independent of pipe wall smoothness\nquestion 26\nto meet common standards, we have to inspect all of the following except\nfoundation irrigation systems\nwater heating equipment\nnormal operating controls for water heaters\nautomatic safety controls for water heaters\nchimneys and flues and vents for water heaters

Answer

Brief Explanations:

  1. For the first question about pressure - loss due to friction: Friction in a pipe occurs when there is relative motion between the fluid (water) and the pipe walls. When there is no water flowing, there is no relative motion, so friction is zero. Pressure loss due to friction is related to pipe length, diameter, and wall smoothness, and there is no fixed upper - limit of 20 psi.
  2. For the second question about inspections: Foundation irrigation systems are not directly related to the common standards for water - heater inspections. Water - heater inspections typically involve checking the water - heating equipment, its operating and safety controls, and related ventilation components.

Answer:

  1. is zero when there is no water flowing
  2. foundation irrigation systems