Is a stainless hinge enough for an equipment protection case at sea?

Answer: No. 304 pits at about hour 210 in 480 hours of spray, so specify passivated 316.

Will an equipment protection case form condensation as the deck cools?

Answer: Yes. The shell falls from 62 to 20 °C at night and trapped air hits dew point. Fit a valve and a 20 g desiccant sachet.

Does a stacked equipment protection case need a pallet?

Answer: Not on a flat shelf. On slats add a 12 mm plywood pad so the 96 kg spreads.

One cut foam block or divided compartments?

Answer: Follow the opening rate. Daily use favours compartments; one opening per trip favours a block that hugs the part.

Do latches break at -35 °C?

Answer: Nylon 66 splits at the hook root. Choose glass-filled nylon or metal, and warm the latch first.

Deck Inspection Equipment Protection Case: Salt Fog and Stacking

Quick answer: On a wind farm service vessel an inspection kit meets salt fog, a 62 °C deck and three-high stacking. Size the equipment protection case from those three: 316 hardware, silicone gasket, ribbed base, with 480 hours, -35 °C and 96 kg on the sheet.

Working Conditions for a Deck Inspection Equipment Protection Case
Salt Fog, Humidity and the Parts That Corrode First
At Minus 35 the Gasket Fails Before the Shell
Three High Stacking: Load Lands on the Lid Corners
Opening and Resetting in Four Steps
Six Numbers to Hand the Factory
FAQ

1. Working Conditions for a Deck Inspection Equipment Protection Case

The kit rides in the deck store and sails fourteen days at a time, arriving by quay crane, deck forklift and hand carry.

Tenders say salt fog resistant and stop there. Add fog hours, stack height and the coldest night, and quotes for the same box spread 30 percent.

Condition	On site	What the case must do
Sunlit shell	62 °C	No softening, no collapsed foam
Store humidity	95%	Valve plus desiccant
Neutral salt spray	480 hours	No pitting on hardware
Coldest night	-35 °C	Gasket still compresses
Stacking	3 high, 32 kg each	96 kg on the bottom unit
Moves per trip	1 crane, 2 forklift, 1 carry	Handle roots survive knocks

The last row is the one dropped: cranes damage handle roots and corners, not shells.

2. Salt Fog, Humidity and the Parts That Corrode First

Salt fog arrives where hardware meets shell, not through the broad faces.

Equipment Protection Case: closed olive green case flat on a rusty grey rack shelf, two side latches and folding handle facing the camera, scuffed corners

A sample run to 480 hours pitted its 304 hinge pin at hour 210 and showed white rust on the zinc latch at hour 96. Passivated 316 and a nylon over-moulded latch came through dulled. Crevices at pins and hooks hold two metals, so the couple eats inward: hardware is no place to save on an equipment protection case.

EPDM takes a compression set and leaves a gap on the second closing; silicone costs 40 percent more and holds rebound from -55 to 200 °C.

A breather valve routes pressure through an ePTFE membrane, fitted face down.

3. At Minus 35 the Gasket Fails Before the Shell

Shell impact strength drops, but four parts decide whether the box opens.

Gasket: silicone recovers a 3 mm compression in 2 seconds at -35 °C, EPDM in 9.
Latches: nylon 66 embrittles near -40 °C and splits at the hook root.
Foam: EVA stiffens and loses contact; cross-linked PE stays soft.
Handle: an unribbed PC root fails on the first drop.

These grades set the cold limit of an equipment protection case, not shell thickness.

4. Three High Stacking: Load Lands on the Lid Corners

Each unit carries the two above it. At 32 kg the bottom takes 96 kg, landing on the lid because upper corners rest on lower lid corners.

Position	Load above	Part taking it	Limit
Top	0	Lid ribs	Two empty units, no collapse
Middle	32 kg	Lid corners	Deflection under 1.5 mm
Bottom	96 kg	Base and corner feet	Deflection under 2 mm

Lashing is 25 mm polyester webbing in a four-point cross; at 15 degrees of roll the case slides under 5 mm.

5. Opening and Resetting in Four Steps

Gloved hands on a moving deck cause most errors here.

Equipment Protection Case: translucent white case upright on a white studio floor, oval opening in the lid, two red latches clamped on the edges

Crack the valve half a turn first: sun heats the interior and a forced latch drags the gasket lip. Release four latches diagonally, away from the hinges. Stop the lid at 95 degrees or the case tips back. Press the foam home, since a lifted corner frees the instrument.

Light bays use a translucent white case with an oval opening and two red latches: sealed by one lip, fine for clean rooms. Deck use keeps four latches and a valve.

Check the lip for grit; a 0.5 mm grain cuts a permanent groove.

6. Six Numbers to Hand the Factory

Internal length from the longest item plus 15 mm of foam per side; loaded weight, which sets base ribs and handle mounts; stack height; a low and high temperature; salt spray hours; opening frequency, which sets latch grade.

Six numbers and a factory can quote shell, hardware and foam in one pass.

Conclusion

A deck store presses on an equipment protection case from three sides: salt fog eats hardware, cold stiffens the gasket, stacking loads the lid corners. Fix hardware and gasket first, base and corners next, opening sequence last. With 480 hours, -35 °C and 96 kg on the sheet, an equipment protection case survives its second voyage.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.