procedure

Sampling is a technique in which samples are drawn at random (without any favor or bias). For this, suitable measures or procedures may be laid down and adopted according to the nature and configuration of parts under inspection for ensuring complete randomness in sample selection. The term sample implies a subset chosen from the population. […]

Prior to placing newly installed natural gas piping and valves in service, systems must be properly cleaned to remove potentially damaging foreign material that is inherently left behind during construction