NMX‑AVM‑30 / Rev 00 / marine shore-side equipment / reach · seal · hold 2026 · Product Page

NMX-AVM-30 · ENGINEERED TO ORDER — AUTOMATED VACUUM MOORING SYSTEMS

A mooring line is a spring with a ship on the end of it.

Name: Automated Vacuum Mooring System
Brand: Neometrix

Under tension it holds an enormous amount of energy, and when one parts it does not fall slack — it whips back through a zone dock crews are trained to stand well clear of. Lines also need constant tending, because the tide rises and cargo work changes a vessel's draft by metres, and every one of those changes has to be answered by hand at the bollard. This machine takes the rope out of the equation: arms on the berth reach out, land pads on the hull, hold the ship against the quay and let go on command. The hard parts are that the hull is wet, curved and never twice in the same place; that the reach must suit every vessel across the whole tide and draft range, not the average one; and that holding is a control problem, not a clamping one — limit the motion within an envelope, never lock the ship rigid, and above all fail safe, still holding. Equipment of this class has been quoted against a multi-berth automated vacuum mooring system requirement for a major port authority; no delivered automated vacuum mooring system is claimed — the class is engineered to order.

Enquire — vacuum mooring Capability sheet (PDF)

Illustrative of the class — a shore-side vacuum mooring machine on a concrete quay edge: a heavy dark-grey painted steel unit on a broad base plate bolted to the quay, carrying two long articulated arms reaching out horizontally over the water, each ending in a large flat rectangular pad head faced with thick black rubber, bright chrome hydraulic cylinder rods angled between frame and arms, a safety-yellow guard rail along the quay edge, a compact grey control cabinet with a blank dark door and galvanised cable tray, and flat empty open water beyond under an overcast sky, no vessel, no people and no readable markings

Fig · 01 The unit — bolted to the berth, arms reaching out over the water, and nobody required at the bollard

Replaces

the ropeand its snap-back zone

Holds within

an envelopenever rigidly

Fails

still holdingfail-safe by design

Lives on

a salt quay24/7, never closed

Status

engineered to orderquoted class

ISO 9001 / 14001 Engineered to order Marine shore-side equipment Quayside structures Noida · India

Overview

The ship is not the problem. The rope is.

Mooring has been done with lines for as long as there have been ships, and the method has two costs that never go away: it is dangerous, and it needs people standing there to keep answering the tide.

Illustrative of the class — close view of the business end of one arm of a quayside mooring machine: a large flat rectangular vacuum pad head faced with thick moulded black rubber, carried on a bright machined stainless gimbal joint allowing tilt in two axes, a heavy reinforced black vacuum hose curving away from the back of the head into the arm, a small bright cylindrical load cell mounted inline behind the gimbal, dark-grey painted steel arm structure below and open water softly out of focus behind, no vessel, no people and no readable markings

Fig · 02 The pad — a seal face on a gimbal, so it can conform to a hull that is curved, wet and moving

A parted line is not a slack line. A mooring rope under load is a spring holding a very large amount of stored energy. When it fails, that energy has to go somewhere, and it goes into the recoil — the rope snaps back along its own axis at enormous speed, through an area that is marked out and taught as a place not to stand. The industry's answer for a century has been training and discipline, which works until it doesn't. Removing the rope removes the hazard outright, and that is the first reason these machines exist.

The second is that lines never stop needing attention. A berthed ship does not stay still. The tide moves it up and down; loading and discharging change its draft by metres over a working shift; wind, swell and the wash of passing traffic push it about. Every one of those changes alters the tension in each line, so lines are tended, slackened and heaved throughout the stay — work that has to happen at exactly the place nobody should be. A vacuum system follows the ship automatically, which is why it is as much a manning and productivity machine as a safety one.

What makes it hard is the target. A vacuum pad is easy to demonstrate on a clean, flat, dry steel plate in a workshop. A hull is none of those things — it is curved in two directions, wet, painted, sometimes fouled, and it is moving. So the pad has to be able to reach a surface whose exact position is not known in advance, conform to it through a gimbal rather than demanding it be square, seal against it well enough to pull down, and then keep sealing while the arm follows the ship for hours. That is why vacuum generation is sized with a reserve for an imperfect seal rather than for the ideal case.

Equipment of this class has been quoted against a multi-berth automated vacuum mooring system requirement for a major port authority. No delivered automated vacuum mooring system is claimed: the class is engineered to order, and the record is stated as it stands.

Safer

No rope, no snap-back zone

The hazard is removed rather than managed — and nobody has to stand at the bollard.

Compliant

It follows the ship

Tide and draft change answered automatically, through a gimbal and a controlled arm rather than by hand.

Fail-safe

Loss of power still holds

Release happens on deliberate command only — never as a consequence of a fault.

Architecture

Reach, seal, hold, release.

The schematic follows the duty — reaching a hull across the full tide and draft range, sealing on a surface that is wet and curved, holding within an envelope rather than rigidly, and releasing only when told — then the machine: mounting, pad and vacuum, motion control, and the safety layer.

FIG · 03VACUUM MOORING ARCHITECTURE · MOUNTING + REACH / PAD + VACUUM / MOTION CONTROL + DAMPING / CONTROL, SAFETY + RELEASE

Fig · 03 A vessel held inside its envelope, with nobody standing beside a rope

Arc · 01

Mounting & Reach

Quay frame or traversing rails, arm geometry sized to the fleet — across the full tide and draft range, not for the average ship.

Arc · 02

Pad & Vacuum

Seal face on a gimbal, vacuum generation with a receiver reserve — sized to tolerate an imperfect seal on a real hull.

Arc · 03

Motion Control & Damping

Force measured at the pads, compliant following, surge and sway damped — the vessel kept inside its envelope, not clamped.

Arc · 04

Control, Safety & Release

Interlocks, monitoring, fail-safe hold, deliberate release — local and remote, with the failure direction fixed by design.

Planning a berth upgrade or a new quay? Send the vessel population, the tide and draft range, the berth layout and the holding criteria — a clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference units, built to the berth.

The parameters below describe reference units. Holding force, unit count and spacing, arm reach and travel, pad size and vacuum capacity all follow from three givens: the vessel population the berth must serve, the tide and draft range to be covered, and the holding criteria the port has to defend in wind, swell and passing-vessel disturbance.

Illustrative of the class — a weatherproof equipment skid on a concrete quay with its hinged access door standing open: a horizontal vacuum pump driven by an electric motor on machined mounting pads, a large horizontal cylindrical steel receiver vessel above it, a compact manifold of valves with black handles, brushed stainless pipework in tidy parallel runs held by clips, and a plain grey control cabinet with a blank dark panel at one end, the skid sitting on a galvanised base frame, no vessel, no people and no readable markings

Fig · 04 The vacuum skid — pump, receiver and control, where the reserve that tolerates an imperfect seal actually lives

Where quayside mooring goes wrong

Reach sized for the average vessel — and then the outlier arrives, sits higher or lower than the design case, and the pads cannot land. Vacuum sized for clean plate — no reserve for a leaky seal on a fouled or heavily coated hull, so the system holds beautifully in commissioning and marginally in service. Rigid holding — a machine that tries to lock the ship instead of limiting it, fighting the tide until something yields. The failure direction not thought through — the single most serious error, where a power or vacuum loss releases the vessel rather than holding it. Corrosion treated as paint — on a structure that lives permanently in salt spray. And maintenance that needs the berth closed — which means, in practice, that it never happens.

So the discipline runs the other way. Reach and travel are sized against the whole vessel population and the full tide and draft range, with the awkward cases named explicitly. Vacuum capacity carries a reserve for an imperfect seal, and the receiver is sized so a momentary leak is not an event. Holding is compliant, with force measured at the pads and surge and sway damped, so the vessel stays inside an agreed envelope while tide and cargo work proceed. The fail-safe direction is fixed at the first drawing and demonstrated at acceptance, not assumed. Corrosion protection is specified as a system — materials, coatings, sealed enclosures, drainage — and every serviceable item is reachable with the berth working.

Full specification — expand

System	Automated vacuum mooring system — quay mounting & arms, pad & vacuum, motion control & damping, control, safety & release
Governing Idea	The rope is the hazard — a mooring line stores enormous energy and recoils through a snap-back zone when it parts; removing the rope removes the hazard rather than managing it
The Difficulty	The hull is a moving, imperfect target — wet, curved, coated, sometimes fouled, never twice in the same place, and moving with swell, wind and passing traffic
The Control Rule	Limit the motion, do not lock the ship — hold within an agreed envelope while the tide and the metres of draft change from cargo work continue freely
Failure Direction	Fail-safe hold — loss of power or of vacuum must never release the vessel; release occurs only on deliberate command, and this is demonstrated at acceptance
Reach & Travel	Arm geometry and any rail traverse sized for the whole vessel population across the complete tide and draft range, with the awkward cases named rather than averaged away
Pad & Seal	Moulded seal face on a gimbal that lets the pad conform to a doubly curved hull instead of demanding a square approach
Vacuum	Generation with a receiver reserve sized to tolerate an imperfect seal and a momentary leak — not sized for clean flat plate
Motion Control	Force measurement at the pads, compliant following, and damping of surge and sway; envelope limits agreed with the port and monitored
Control & Interface	Local and remote control, status monitoring, interlocks, alarms, and an emergency release that is deliberate, quick and reliable when it is genuinely needed
Environment	Permanent salt-spray exposure and continuous duty on a berth that cannot be closed — corrosion protection as a system, sealed enclosures, drainage, and servicing possible while the berth works
The Split	The site's marine and naval hydraulic deck equipment covers shipboard machinery — winches, capstans and windlasses that belong to the ship and are worked by its crew. This machine belongs to the berth: different owner, different installation, different duty. The marine gangway and accommodation ladder is the other shore-to-ship interface, for people rather than for restraint, and the boat davit and launch and recovery system applies the same marine-structures discipline at a smaller scale
Scope Boundary	Ours: quay mounting & arm structure, pad & seal design, vacuum generation & reserve, force measurement & damping, control, interlocks & fail-safe logic, corrosion protection, installation, commissioning, documentation, training, spares & AMC — including build to the customer's specification. Bought-in certified: pumps, cylinders, sensors, control hardware. The customer's: the berth, its vessel population and the holding criteria
Status	Engineered to order — equipment of this class quoted against a multi-berth automated vacuum mooring system requirement for a major port authority; no delivered automated vacuum mooring system is claimed

PDF · 1 page

Automated Vacuum Mooring System — Capability Sheet

Tender Response

Send vessel population, tide & draft range — compliance matrix in two working days

Variants

One principle, four installations.

What changes is how the unit is carried and how much of the berth already exists.

Var · 01

Fixed Quay-Mounted Units

Bolted to the berth at set positions — the simplest and stiffest arrangement where the vessel population is consistent.

Var · 02

Rail-Traversing Units

Units that move along the quay — so pad positions suit very different ship lengths and parallel-body locations.

Var · 03

Floating & Pontoon Berths

Mounted on a structure that moves with the tide — which changes the reach problem, and the mounting design with it.

Var · 04

Retrofit & Control Integration

Fitting an existing berth — foundations, services and integration with the port's existing control and monitoring.

Applications

Wherever a ship has to be held safely.

The berths where line handling is most dangerous, most frequent, or most disruptive.

A · 01Container & bulk cargo berths

A · 02Ro-Ro & ferry terminals

A · 03Naval & coast guard jetties

A · 04Liquid cargo & product berths

A · 05Ship-to-shore transfer operations

A · 06Berths exposed to swell & passing traffic

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Can a vacuum really hold a ship?

Yes, and the reason is area rather than cleverness. Atmospheric pressure pushes on every square metre of a surface with roughly ten tonnes of force; a vacuum pad does not "suck" so much as remove the air from behind itself and let the atmosphere do the holding. That means the achievable force scales directly with pad area and with how good a vacuum can be maintained, and a set of pads of modest size adds up to a very large restraining force. It also explains where the engineering effort actually goes, which is not into the pump. Two things dominate. First, seal quality on a real hull: a pad against clean flat plate will hold far more than the same pad against a curved, coated, slightly fouled hull, and since it is the hull that decides, the system must be sized for the poor case and carry a reserve for it. Second, the direction of loading: the useful force is normal to the pad face, while much of what a moored ship does — surging fore and aft, sliding along the quay — loads the pad in shear, resisted by friction at the seal face rather than by the vacuum directly. So pad material, face pressure and the structure carrying the pad all matter as much as the vacuum level. The honest summary is that the physics is simple and generous; the difficulty lies entirely in maintaining it against a surface that was never designed to be sealed against.

Q · 02 What happens if the power fails?

Nothing should happen — and designing for that is the single most important decision in the system. A mooring machine that released its vessel on a power cut would be far more dangerous than the ropes it replaced, because the failure would arrive without warning and with nobody standing by to take a line. So the failure direction is fixed at the very first drawing: the machine holds. In practice that is achieved in layers rather than by one trick. The vacuum circuit is arranged so that holding does not depend on the pump running continuously — a receiver reserve retains sufficient vacuum to ride through an interruption, and valving is selected so that a de-energised valve isolates and preserves the vacuum rather than venting it. The arm and its actuation are arranged so a loss of hydraulic or electrical power leaves the geometry where it is instead of allowing the arms to fall away. Monitoring is continuous, so a developing loss — vacuum decaying, a pad losing contact — raises an alarm long before it becomes a release, and there is time to act. And release itself is made deliberate: a specific commanded action, available quickly when genuinely needed, but never something a fault can imitate. All of this is demonstrated at acceptance rather than asserted, because it is exactly the behaviour a port cannot afford to discover is untested.

Q · 03 Why not just hold the ship rigidly?

Because a berthed ship has to be allowed to move, and a machine that refuses to permit it will eventually break something — itself, its foundation, or the hull. Two motions are not optional. The tide raises and lowers a vessel continuously, by metres in many ports. And cargo work changes draft, often dramatically: discharging a bulk carrier or loading a tanker moves the hull vertically through a large range over a single shift. Neither can be resisted, so vertical compliance is mandatory rather than a refinement. Other motions are undesirable but unavoidable in the short term: surge along the quay, sway off it, and the slow drift induced by wind, current and the wash of a passing vessel. The correct behaviour is to limit these within an envelope agreed with the port — small enough that cargo handling equipment stays aligned and gangways stay safe, but not so tight that the system is in a permanent fight with the sea. That makes the design a control problem: force is measured at the pads, the arms follow compliantly within their range, and surge and sway are damped rather than blocked, so energy is absorbed instead of being transmitted straight into the structure. A rigid clamp would concentrate every one of those loads at the pad and its mounting, which is precisely where you least want them.

Q · 04 How is this different from your shipboard deck equipment?

Different owner, different installation, different duty — and it is worth being precise, because both involve mooring. The site's marine and naval hydraulic deck equipment is shipboard machinery: mooring winches, capstans, windlasses and warping equipment mounted on the vessel's deck, powered from the ship's systems, operated by the ship's crew, and designed around the constraints of being carried — weight, deck area, classification requirements and a working life spent moving. This machine is shore-side. It is bolted to a berth that never moves, owned and operated by the port rather than by any ship, and it must serve every vessel that comes alongside rather than one known hull. That inverts several design drivers: mass is no longer expensive, but the reach envelope becomes critical because the machine cannot be adjusted per ship; the installation is a civil engineering problem involving foundations and quay loading; and the duty is continuous across many vessels and years rather than intermittent. The two are complementary rather than competing — a ship keeps its deck machinery for berths that have no shore system, and a port with vacuum mooring simply does not ask the crew to use it. The gangway and accommodation ladder is the closer relative in spirit: another shore-to-ship interface that has to bridge a gap which will not hold still.

Q · 05 What decides how many units a berth needs?

The vessel population and the environmental loads, worked through together — and it is genuinely a berth-by-berth calculation rather than a catalogue lookup. The starting point is what must be resisted: wind on the exposed side of the largest vessel, current along the berth, the surge induced by passing traffic, and any swell that reaches the quay. Those produce longitudinal and transverse loads that vary enormously between a sheltered inland berth and an exposed one. Against that sits what each unit can contribute, which depends on pad area, achievable vacuum on a real hull, and the direction the load arrives from, since shear at the seal face behaves differently from normal load. Then geometry constrains the answer: pads must land on the vessel's parallel body — the flat-sided middle region — and that region's length and height above water differ hugely between the largest and smallest ships expected, so unit spacing must suit both without leaving the small vessel with only one pad in contact or the large one unsupported at its ends. Tide and draft range then set how much vertical travel each arm needs. The usual outcome is several units distributed along the berth, sized so the system still meets its criteria with one unit unavailable, because maintenance and faults are certain over a service life and the berth cannot close for either.

Q · 06 What do you build, what is bought in — and what is claimed?

Divided honestly. What Neometrix provides: the quay mounting and arm structure — base frame or traversing rails, arm geometry and the load path into the berth; the pad head and seal design with the gimbal that lets it conform to a doubly curved hull; vacuum generation and its receiver reserve, sized for an imperfect seal rather than for clean plate; the force measurement, compliant following and damping that hold a vessel inside an agreed envelope while tide and cargo work continue; the control, interlocks, monitoring and fail-safe logic, including a deliberate emergency release, demonstrated at acceptance rather than asserted; corrosion protection as a system — materials, coatings, sealed enclosures and drainage for permanent salt exposure, with serviceable items reachable while the berth works; and installation, commissioning, documentation, training, spares and AMC, including build to the customer's own specification, which is how requirements of this class are framed. What is bought-in certified: vacuum pumps, hydraulic cylinders and power units, sensors and control hardware — proprietary products of established makers, integrated rather than imitated. What is the customer's: the berth and its civil structure, the vessel population it must serve, and the holding criteria the system is judged against. And the record, stated plainly: equipment of this class has been quoted against a multi-berth automated vacuum mooring system requirement for a major port authority. No delivered automated vacuum mooring system is claimed; the class is engineered to order, around the berth it has to serve.

↗

The marine family from Neometrix.

What belongs to the ship, what belongs to the berth, and what bridges the two.

↗ Shipboard

Marine & Naval Hydraulic Deck Equipment

Winches, capstans and windlasses that belong to the ship and its crew.

↗ Interface

Marine Gangway & Accommodation Ladder

The other shore-to-ship bridge — for people rather than for restraint.

↗ Handling

Boat Davit & Launch and Recovery System

The same marine-structures discipline, at a smaller scale and over the side.

Browse all Neometrix product lines.

Get a quotation

Send the berth
and the vessels it must hold.

The projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — vacuum mooring Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — AUTOMATED VACUUM MOORING SYSTEMS THE ROPE IS THE HAZARD · LIMIT THE MOTION, DO NOT LOCK THE SHIP · FAIL SAFE, STILL HOLDING ENGINEERED IN NOIDA · INDIA

A mooring line is a spring with a ship on the end of it.

The ship is not the problem. The rope is.

No rope, no snap-back zone

It follows the ship

Loss of power still holds

Reach, seal, hold, release.

Mounting & Reach

Pad & Vacuum

Motion Control & Damping

Control, Safety & Release

Reference units, built to the berth.

Where quayside mooring goes wrong

One principle, four installations.

Fixed Quay-Mounted Units

Rail-Traversing Units

Floating & Pontoon Berths

Retrofit & Control Integration

Wherever a ship has to be held safely.

Common questions.

The marine family from Neometrix.

Marine & Naval Hydraulic Deck Equipment

Marine Gangway & Accommodation Ladder

Boat Davit & Launch and Recovery System

Send the berth
and the vessels it must hold.

Similar Products

Share This Page

A mooring line is a spring with a ship on the end of it.

The ship is not the problem. The rope is.

No rope, no snap-back zone

It follows the ship

Loss of power still holds

Reach, seal, hold, release.

Mounting & Reach

Pad & Vacuum

Motion Control & Damping

Control, Safety & Release

Reference units, built to the berth.

Where quayside mooring goes wrong

One principle, four installations.

Fixed Quay-Mounted Units

Rail-Traversing Units

Floating & Pontoon Berths

Retrofit & Control Integration

Wherever a ship has to be held safely.

Common questions.

The marine family from Neometrix.

Marine & Naval Hydraulic Deck Equipment

Marine Gangway & Accommodation Ladder

Boat Davit & Launch and Recovery System

Send the berthand the vessels it must hold.

Similar Products

Share This Page

Send the berth
and the vessels it must hold.