code: protected function getLongestPipeLength()
  	{
  		if(empty($this->pipes)) return 0;
  
  		return array_reduce($this->pipes, function($carry, $pipe)
  		{
  			return strlen($pipe) > $carry ? strlen($pipe) : $carry;
  
  		}, static::MIN_PIPE_LENGTH);
  	}
docs: Calculate the length of the longest pipe name.
  
  @author	Andrea Marco Sartori
  @return	integer