30. Covered pots. If necessary, one may put a pot with fleishigs and a pot with milchigs on a [gas] stove at the same time if they are covered and there is no fear anything will splatter from one to the other. They may not touch each other, even if they are completely dry (רמ"א סי' צ"ב ס"ח ). If they did, they are not ossur even if there is a bit of moisture present between them (חוו"ד סי' צ"ב סק"כ ).
31. Uncovered pots. Uncovered pots must be far enough from each other that there is no concern droplets will splatter from one into the other or that the rising steam from the pots will intermingle. If they are steaming, something must act as a divider between them, e.g., a standing sheet of aluminum foil.
32. Fleishige, parve pots. Similarly, if a fleishige or milchige pot is on the stove along with a parve pot, care must be taken to ensure that nothing from the fleishige/milchige pot splatters into the parve pot.
33. Fleishige sauce splashed onto parve pot. If one saw fleishige sauce splash onto a parve pot, he must kasher the parve pot to remove the fleishige bliyos. Unless one saw something splash, he does not need to worry that something might have splashed.
34. Even if the sauce splashed onto the food in the parve pot, the food is usually at least sixty times the volume of the drops, thus the food remains parve. If, while the parve pot was on the fire, the sauce splashed onto the outside of the pot, one must kasher the pot by putting the side that got splashed into boiling water. If the parve pot was off the fire and cool, it is enough to pour boiling water from a kettle onto the area that got splashed.
