Blast & Plate Freezers


Hatch Mount Blast "Drop-in" Freezer)


Aluminum Extruded Evaporator Plates

Blast freezing is an extremely cold, extremely fast freezing process. Rapid freezing creates small ice crystals and the smaller the crystals, the less damage to the food.

Blast freezer temperatures typically range from -20 degrees to -40 degrees Fahrenheit and air is circulated to further speed the process. Extreme cold inhibits bacterial growth, which needs to be avoided to ensure food safety. For tenders and fishermen who blast freeze product like tuna, shrimp, salmon, crab, squid, mackerel, cod, pollock and scallops aboard their boats, Integrated Marine Systems has engineered proven-successful solutions.

Hatch Mount Blast Freezer

Hatch Mount Blast Freezers are designed for vessels that convert from a wet hold (filled with water – “tanked”) to a dry freezing hold. These vessels would typically fish for crab during that season and convert to freezing albacore during the tuna season. The system is designed to literally drop in the hatch cover, plug into a receptacle, connect two condenser water lines and be ready to freeze product. You can freeze onboard fast, get paid more for your catch and stay out longer. With a per-day freezing capacity ranging from 1000 to 8000 lbs., this small unit is a big producer of exceedingly cold temperatures. The Wilson family from Oregon provided us with step-by-step photos of their Hatch Mount Blast freezer installation.

Low Temperature Freezing Onboard

These systems are designed for full-time freezer boats such as off-shore albacore, salmon or shrimp producers. Self-contained condensing units are usually mounted in a machine space and matched with an evaporator or plate system in the vessel’s processing area or in the insulated hold.

Aluminum Extruded Evaporator Plates

IMS owns a special aluminum extrusion die used for plate freezing of boxed product or individual fish. These systems are usually matched with low-temperature condensing units and are primarily used for boxed shrimp, individual salmon, albacore and other products. The design of these plates incorporates a flat surface on top of a heavy aluminum bed with a finned bottom surface for maximum heat exchange. The size can range from 8″ wide to 32″ wide in 8″ increments with lengths up to 12′. Longer plates are generally more economical since much of the manufacturing cost is in finishing the ends. It is necessary to have 8″ of space between each bank of freezer plates. The plates can be built into racks or delivered separately to be easily installed into the available space in the fish hold onboard.

Blast & Plate Freezing for Seafood and Food Processors

IMS has designed two specialized portable units for blast freezing applications for land-based processors that are available in a wide range of capacities. The FastFreeze production tunnel freezer and blast-freezing cell packages are both manufactured as free-standing systems; built into shipping containers that fit well into processing operations since their placement is flexible. IMS also supplies the commercial refrigeration industry with freezer plates. See our Production Freezers page for more information.

From Happy Customers

The first trip that I unloaded frozen salmon using IMS blast-freezing equipment, a friend of mine from another boat in the fleet (who had been freezing for several years) asked me what the temperature was on my salmon. I told him that the coldest fish were 37 below, he said 'It looks like we've got a new record low in the fleet!' Often, the temperature in my fish hold has reached 47 below!"

George Eliason, Owner, F/V Tammy Lin - Sitka