Products

R.W. Fernstrum & Company

GRIDCOOLER Keel Cooler – 90/10 Copper-Nickel

Keel cooler (external hull-mounted) · GRIDCOOLER (CuNi, enhanced or smooth interior tubing)

GRIDCOOLER Keel Cooler – 90/10 Copper-Nickel
GRIDCOOLER Keel Cooler – 90/10 Copper-Nickel
GRIDCOOLER Keel Cooler – 90/10 Copper-Nickel
GRIDCOOLER Keel Cooler – 90/10 Copper-Nickel

Hull-mounted rectangular-tube keel cooler in heavy-walled 90/10 CuNi with one-piece header, silver-brazed; enhanced interior tubing optional.

Fernstrum's core product is a closed-circuit cooler fitted outside the hull below the waterline. Engine coolant flows through heavy-walled rectangular 90/10 copper-nickel tubes, which resist fouling naturally. The one-piece rectangular header keeps joints to a minimum. The whole unit is torch-brazed in one operation with 56% silver braze wire, and critical joints are checked ultrasonically. The exclusive enhanced interior wall, with a truncated-cone pattern and offered since 1998, raises heat transfer by up to 30%, the company says. A smooth-wall option is also available. The copper-nickel must be electrically isolated from the hull to keep its anti-fouling properties.

Specifications

Material
90/10 copper-nickel
Header
one-piece rectangular header
Brazing
torch brazed, 56% silver braze wire
Joint inspection
ultrasonic (critical brazed joints)
Enhanced tubing heat transfer gain pct max
30
Enhanced tubing since year
1,998
Interior wall options
enhanced (truncated cone), smooth
Max field pressure test psi
35
Max field pressure test bar
2.41
Anodes
zinc or aluminium anode kit (2 anodes per set, typically 1 set per cooler)
Mounting
recessed, external, side-mounted

Listed under

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