Santa Fe Pacific Pipeline Partners L.P., which operates an independent refined petroleum products pipeline, reported net income of $52.3 million, or $2.64 a unit, for 1996, compared with $40.4 million, or $2.04 a unit, in 1995. The figures include $23 million last year and $34 million in 1995 for environmental and litigation costs. Revenue gained 3% to $240.1 million from $233.7 million. Net income for the fourth quarter totaled $5.4 million, or 27 cents a unit, contrasted with a net loss of $4.3 million, or 21 cents a unit, a year ago. Revenue rose 4% to $60.4 million from $58.1 million.