TERPS sets the guidelines for drawing up a procedure. Captain Prop is right that ATC can not vector you on to final with more than a 30 degree intercept (unless you are in a helicopter) or if the feeder route takes you to the FAF, it must align with the final approach course within 30 degrees no course reversal is required. If the feeder route takes you to the imtermediate fix to start the intermediate segment of the approach, the max intercept is 120 degrees without a course reversal. If the intercept is more than 90 degrees, there has to be a lead in radial giving you 2 miles heads up. This might be where MarcK is getting his numbers.
Those are maximum numbers, there could be something locally that limits the intercept more. But 140 degrees, you're going to have to do a PT/racetrack/teardrop/something on the protected side to get turned around.