Technical Foundation
What Is a Bulkhead Tank Fitting?
A bulkhead fitting passes through a hole cut in a tank wall, clamping the wall between a gasket-sealed flange on each side (inside and outside) and drawing tight with a locknut, so the seal is maintained by compression against the tank wall itself rather than by threading directly into the tank material. This makes bulkhead fittings compatible with thin-walled plastic, FRP and metal tanks that couldn't reliably hold a directly-tapped thread under pressure or vibration.
Material compatibility with the contained media is critical on both the fitting body and the gasket — a fitting body rated for the chemical may still fail from a gasket material incompatible with the same fluid, so gasket elastomer (EPDM, Viton, PTFE-encapsulated) is selected independently against the chemical resistance chart for the specific media. Fitting size must also account for tank wall thickness, since the clamping range needs to fully engage a wall within its rated thickness tolerance to seal properly.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Port Size/Thread | NPT, BSP, or flanged connection, sized to piping | Must match the piping or hose connection being made on both sides of the tank wall |
| Body Material | PVC, CPVC, polypropylene, stainless steel | Must resist chemical attack from the contained media at the operating temperature |
| Gasket Material | EPDM, Viton, PTFE-encapsulated | Must independently resist the contained media — a compatible fitting body doesn't guarantee gasket compatibility |
| Wall Thickness Range | Clamping range the fitting accommodates | Must fully engage the actual tank wall thickness within its rated tolerance to seal properly |
| Pressure Rating | Rated working pressure at a given temperature | Must exceed the tank's maximum internal pressure with adequate safety margin |
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Applications
Where Bulkhead Tank Fittings Get Used
Bulkhead fittings are used anywhere a sealed pipe, hose or sensor connection needs to pass through a tank wall without threading directly into the tank material.
Chemical Storage Tank Fittings
Bulkhead fittings in chemically compatible materials providing drain, fill and sensor penetrations on storage and process tanks.
Water & Wastewater Treatment
PVC and stainless bulkhead fittings on treatment and holding tanks for piping and instrumentation connections.
Agricultural Spray & Fertilizer Tanks
Polypropylene bulkhead fittings resistant to fertilizer and pesticide chemistry on tank-mounted spray equipment.
Aquaculture & Aquarium Systems
Bulkhead fittings providing sealed penetrations for filtration and drain plumbing on tanks and sumps.
Industrial Process Tanks
Stainless and high-temperature bulkhead fittings on process tanks requiring sensor and instrumentation access points.
FAQ
Bulkhead Tank Fittings Questions, Answered
Why use a bulkhead fitting instead of just tapping the tank wall?
Many tank materials — thin-walled plastic, FRP, or thin sheet metal — can't reliably hold a directly-tapped thread under pressure or vibration without cracking or stripping. A bulkhead fitting seals by clamping a gasket against the tank wall from both sides, distributing the sealing force across a much larger area than a direct thread would provide.
What wall thickness range does a bulkhead fitting support?
Each fitting has a rated clamping range it can accommodate while still fully compressing the gasket seal — check the manufacturer's specification against your actual tank wall thickness, since a wall too thick or too thin for the fitting's range won't seal reliably even if the fitting physically fits through the hole.
Does the gasket material need to match the fitting body material?
Not necessarily the same material, but it must independently be chemically compatible with the contained media — a fitting body rated for a specific chemical can still fail if paired with an incompatible gasket elastomer, so check chemical compatibility separately for both the body and the gasket.
Can bulkhead fittings be used above or only below the liquid level?
They can be used at any point on the tank wall, above or below the liquid level, provided the fitting's pressure rating covers the hydrostatic pressure at that point (higher near the bottom of a tall tank) — sizing and material selection should account for the actual pressure at the specific mounting height.
What's the difference between threaded and flanged bulkhead fittings?
Threaded bulkhead fittings connect directly to threaded pipe or fittings on each side, suited to smaller port sizes and lower-pressure connections. Flanged bulkhead fittings use a bolted flange connection, common on larger port sizes or where the connecting pipe is also flanged, offering a more robust seal for higher pressure or larger diameter connections.
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