This fluid will represent the feed to the low temperature separator, so change its name to "lts" and give it a temperature of 0 C.
The LTS feed is the vapour off of the inlet separator (our feed fluid vapour phase), after passing through two heat exchangers. Let's assume a 50 kPa pressure drop on each exchanger. We could just type in 3900 kPa, since we know the feed fluid pressure, but a better approach is to include the feed pressure in a simple formula.
@feed - 100
The 'at sign' means retrieve the value from the fluid whose name follows the @. In this case we want the pressure of the feed fluid and since this formula is for a pressure variable, all we have to enter is the feed name. It would also be correct to enter the formula as:
@feed.P - 100
but the specific variable type is not required in this case.
iPad When you are in a formula field on the iPad, you can tap on an icon on the background diagram to have that object's name appended to the end of the formula. You can pan and zoom the diagram to bring the desired object into view, without closing the overlying window.
Continue down to the flow field.