â¢ Surname is the family name or the last name of a person, whereas first name is the unique name given to a person at birth, also referred to as his Christian name. â¢ Surname is passed down generations, whereas first names are unique depending upon physical attributes or circumstances at birth of a kid.
PVC pipe is available in a wide range of wall thicknesses and strengths (pipe. stiffness). PVC pipe is routinely perforated (slotted) and used as well screen. This same slotted pipe can also be used for toe drains. Slotting is done at the. factory, and slots are available in a wide range of slot widths and POA.
Pipe materials and specifications. The pipes used in a building must not contaminate potable water supply, and must be suitable for the water pressure, flow rate and temperature of water they will be carrying. This will be influenced by the materials used and also by other factors such as the wall thickness.