I need to go in and out of Thailand in sept 2014 to activate my second entry tourist visa..I plan to fly to vietnam and back into bangkok to be safe..I'm safe?..

How many months out of, say, the last 2 years have you spent in Thailand?

I cannot predict anything for September. My crystal ball is a bit foggy. But at the moment I would suggest planning an overnight stay out of the country.

How many months out of, say, the last 2 years have you spent in Thailand?

been on a non b for the past 15 months.

I would love to tell you that 2x tourist visas would be ok but until immigration defines these rules more clearly so that people understand exactly were they stand nobady can answer your question with certainty

My own feeling on the matter is that if you spend less than say 6 months in Thailand in any one year and can show an exit flight booking then you are not going to have any problems with tourist visas, I could be wrong and it may be as above but only 1x tourist visa allowed

It is a complex issue and one that even immigration might have difficulty defining exactly

Here is what I think they would consider no matter what

Your previous lengths of stay in Thailand in any 12 months period - so if you visit Thailand over the winter every year for 5-6 months and leave for 6 months then you are never going to have a problem

If you work offshore and your pattern is 1 month 2 month duration (either way) then you most likely will never have a problem

If you stay here 10 months or more out of 12 months doing constant visa runs on tourist visas year on year then you are likely going to be scrutinised and have a problem

anything in the grey area between the above is in the lap of the gods

immigration should publish a formula and say something like that if you stay here on tourist visa for 2 months then you must leave for at least 1 month or 6 months and 6 months in any 12 or VOA must leave after 1 month for at least 1 month or get an extension for up to 1 months = 2 months total stay issued at local immigration upon interview, I think they need to come up with a formula but it is by no means easy

the standard tourist visa can be increased to 90 days from of 60 for a fee at local immigration, so all the above is not far away - it just needs clarification and a bit of thought