I think with regard to short term trade 30-50 pipes tend to be enough to safe with regard to SL however upabout lengthy term Usually just about almost most tend to be not used SL however if any kind of one trade and need to established SL after that i think 100-150 pipes minimal safe with regard to SL. this really is just my opinion. u ought to trade and established u personal strategy and plan. this depend upon u personal business strategy.