A suction line accumulators is designed with a bend pipe to prevent internal splashing and in the collection of refrigerant.  The bend pipe should be installed as close to the compressor as possible.

A suction accumulator is used to prevent liquid refrigerant flood-back to the compressor.  Accumulators are commonly used on heat pumps, transport refrigeration systems, low-temperature supermarket refrigeration systems, and in any situation where liquid refrigerant is a concern.