EagleBurgmann Mechanical
Seal Spare Parts Supplier
Seal Spare Parts Supplier
MG1 · MG12 and MG13 · M7N · H7N and H12N · HJ92N and HJ977GN
EagleBurgmann families a pump seal request can reference
EagleBurgmann is a seal maker a superintendent can meet twice on the same ship, at opposite ends of it. EagleBurgmann's shipbuilding pages list seal components approved by a number of shipping bodies, on duties running from fuel supply and fire fighting to bilge and ballast pumps and stern tube seals — and the M7N is on that marine list by name. So a plate in the engine room and one in the shaft tunnel are two unrelated requests.
MG1, MG12 and MG13 — one seal, three tails
These three are not three seals. The maker's current data describes their successors that way — the eMG12 as the eMG1 with a longer bellows tail, reaching the fitting length coded l1k under EN 12756 with seat G6 or G60, and the eMG13 the same again for l1N — and lists each as 100% compatible with the MG seal of the same number. A line reading MG1 where the chamber wants an MG13 is the right seal at the wrong length.
eMG1, eMG and eRMG1
EagleBurgmann states the eMG1 is fully compatible with the MG1 and replaces it one-to-one, and it keeps the tail logic: eMG12 for l1k, eMG13 for l1N, eMG shortened to the shortest length, coded lS. The eRMG1 adds a special bellows surface on the shaft side, for hot water pumps.
M7N and M7F, and the M74 branch
An unbalanced single seal for plain shafts, driven by the maker's Super-Sinus spring, independent of the direction of rotation, catalogued for lube oils and low solids content. The M7F adds a pumping screw, which makes it dependent on the direction of rotation. M74 swaps to multiple springs, M7S2 drives through a key, M78N carries a PTFE secondary element.
Two balanced seals that behave differently
Both are balanced single seals for stepped shafts, both catalogued for hot water duty, and there the resemblance stops. The H7N runs a Super-Sinus spring or multiple rotating springs, independent of the direction of rotation; the H12N transmits torque through a conical spring and is marked dependent on it. On a pump that runs both ways, that decides which is admissible.
HJ92N and HJ977GN — same length, different faces
A balanced single seal to EN 12756 for unstepped shafts, its rotating spring encapsulated so that it sits out of the product; the maker lists it for dirty, abrasive and solids-carrying media. HJ977GN is the same seal at the same installation length with silicon carbide against silicon carbide. HJ927GN and HJ97GN5 move that length.
The other end of the ship
EagleBurgmann has catalogued water-lubricated stern tube seals as type 4600 and, for closed systems, type 4604; its current marine catalogue lists the type 4610 — a balanced, semi-cartridge single seal lubricated with sea water in an open system, with no oil or grease emission, supplied with or without a shutdown seal. Quote the type from the seal's own documentation — that request shares no field with a pump seal.
A type is an arrangement. It is not an installation.
EN 12756 is titled, in its own words, “Principal dimensions, designation and material codes”. It fixes how a seal is described and where it has to fit, and says nothing about the pump. That gap is where seal enquiries go wrong.
Read the designation as a row of fields rather than a name: the type, the shaft size, the seat form — G6, G60, G9, G16 and G46 turn up in these families — then a material code of several letters for the seal face, the seat, the secondary seal and the metal parts. Four of those fields move while the type stays put, which is why two pumps on the same deck can both carry an M7N plate and need different seals. A is a carbon graphite with antimony impregnation, B one with resin impregnation, the Q group silicon carbide. The letters are positional too: in the seat position of an EagleBurgmann code, V is aluminium oxide; in the secondary seal position of the same code, V is FKM.
The prefix will not do the work either. Across the four pusher types above, the maker's own product data gives an unbalanced seal for plain shafts, two balanced seals for stepped shafts and a balanced seal for unstepped shafts — and of the balanced pair, one tolerates either direction of rotation and one does not. Neither the balance, nor whether the shaft is stepped, nor whether the seal survives reversal follows from reading M, H or HJ.
What is actually ordered against a seal designation
Listed as the joint is built up: the friction pair, then what holds and loads it, then the secondary sealing elements, then the pump parts that decide whether the new seal lasts.
- Rotating seal face rings in the carbon graphite and silicon carbide grades the type carries
- Stationary seats by seat form, since the form and not the size decides the fitting length
- Matched friction pairs quoted together, because a new face against a worn seat wears to the old profile
- Elastomer bellows units for the MG and eMG families, carrying drive and secondary seal in one part
- Secondary seal O-rings, and the PTFE secondary elements on the T-coded variants
- Sinus, conical and multiple spring sets, and the encapsulated spring assemblies of the HJ families
- Drive collars, drive keys and set screws, which differ on the S2 variants
- Pumping screws on the F variants, handed to the direction of rotation
- Seat cooling and barrier supply parts, where the arrangement has them
- Complete seal assemblies as one line where the pump has not been opened
- Shaft sleeves, sleeve O-rings, gland plates, throttle bushes and neck rings from the pump side
The pump-side items are there because they change the answer, not because they belong to the seal: a sleeve that fretted under the old seal damages the new one in the same place. Wider consumable routing sits on marine seals, gaskets and bearings.
What has to arrive before a seal line is quotable
Two of the fields that settle a seal are on the seal, two are on the pump, and one is only in the engineer's head. The list runs as it is easiest to collect with the pump open.
- Every character marked on the seal or its retainer, photographed rather than typed
- The shaft or sleeve diameter as measured at the seal, and whether it is stepped or plain there
- The pump make, model and serial number, and the position the pump occupies
- A photograph of the removed seal with both faces to the camera, and a second with the springs visible
- Whether it came out as one cartridge or as loose components, and whether it carried setting clips
- What the pump is on: sea water, cooling fresh water, fuel oil, lube oil, hot condensate, bilge or sludge
- Whether the arrangement is single or double, and whether the pump can run in reverse or run dry
- Whether the seal chamber has a flush, barrier fluid or cooling supply piped to it — a cooled seat for hot water, catalogued as G115 on the H12N and H75 types, is a different part from the plain seat
- The direction of rotation seen from the drive end — for the F variants and the conical-spring types
- The pump maker's sectional drawing with the seal's part numbers on it — EagleBurgmann's own drawings number the parts to DIN 24250 (472 seal face, 475 seat, 477 spring, 485 drive collar), the same pump-part numbering many sectional drawings use
- How the last seal failed: weeping, fretted, faces chipped, bellows hardened, springs choked
- Vessel and IMO number, the port and the ETA
Tools for this equipment: the mechanical seal material code for the face, seat, secondary seal and spring letters, and the O-ring size finder for the secondary O-rings. Where the seal is built to EN 12756 dimensions, the mechanical seal size finder gives its installation length from the shaft diameter.
Where the duty decides the route, and where the pump does
A seal list divides along a line that is not the usual one. It is not size against casting here; it is which of the seal's parts the duty has an opinion about.
The secondary seal is where duty rules and the type designation is silent. EagleBurgmann codes the compound into the material string — NBR, EPDM, FKM, FFKM, and PTFE on the T variants — and the choice is chemistry rather than grade. An EPDM compound belongs on water and water-based cooling and is the wrong answer on mineral oil, where it swells and gives up its strength; a fluorocarbon is the usual choice against fuel and lube oil; a nitrile is a sensible everyday answer on mineral oil and a poor one where ozone and sunlight reach it. Hot condensate pushes the choice again. None of that is visible after a year in service, so an enquiry naming the duty gets the right compound and one naming only the type inherits whatever the last buyer ordered.
The friction pair is where the pump has the opinion. Carbon graphite against silicon carbide is forgiving of a moment of poor lubrication; silicon carbide against silicon carbide is harder, stands up to sand drawn through a sea chest, and is much less forgiving of a dry start. HJ92N and HJ977GN are that exact choice at one installation length, which is why the pairing is stated rather than inferred. The cartridge question follows from the same reasoning: a cartridge arrives set, its working height and face load fixed at the works, while a component seal is set on the shaft by whoever fits it — so on a machine nobody on board has opened, the cartridge is the safer line. Faces, seats and bellows units go to an OEM-route review.
EagleBurgmann seals — questions buyers ask
Is MG13 just a bigger MG1?
No. The maker's current data gives the eMG12 and eMG13, listed as 100% compatible with the MG12 and MG13, as the eMG1 with a progressively longer bellows tail, reaching the fitting lengths coded l1k and l1N under EN 12756 with seat G6 or G60. The difference is where the seal sits in the chamber, not how much it seals. Send the designation as it reads on the retainer; if the bellows has perished, send the pump drawing.
My old seal is an MG1 and the offer came back eMG1. Same part?
On length and fit, yes, by the maker's own statement: EagleBurgmann lists the eMG1 as 100% compatible with the MG1, and the eMG12 and eMG13 likewise with the MG12 and MG13, and the MG family no longer appears in its online catalogue. The maker's data gives the eMG seals as balanced, for plain shafts and independent of the direction of rotation. What still has to match is the material code of the old line — face, seat and elastomer — so send it with the request.
Can you quote from the shaft diameter?
It starts the enquiry and does not finish it. Inside one type the face pairing, the seat form, the secondary seal compound and the spring arrangement all vary, and any of them can be why the last seal failed early. Add the duty in plain words and photograph the retainer.
Why ask what the pump is on when the seal is marked?
Because the type marking does not carry the compound. The secondary seal is chosen against the medium, and one type is built with a nitrile, a fluorocarbon, an EPDM, a perfluoroelastomer or a PTFE element depending on what is on the other side of it. Sea water, fuel oil, lube oil and hot condensate are four answers.
Should I order an EagleBurgmann cartridge or a component seal?
On a machine nobody on board has opened, the cartridge is the safer line. A cartridge arrives set, with its working height and face load fixed at the works, while a component seal is set on the shaft by whoever fits it. Say which one came out of the pump and whether it carried setting clips.
Can I renew just the seal face?
It is quoted as a pair. A new face run against a worn seat wears to the old profile, so the rotating face and the stationary seat go on the enquiry together, and the seat is chosen by its form, since the form rather than the size decides the fitting length. State the face pairing as well: carbon graphite against silicon carbide and silicon carbide against silicon carbide are different choices at the same installation length.
Is Vessel Core connected to EagleBurgmann?
No, and there is no agreement of any kind. Vessel Core holds no dealership, distribution, representation or partnership agreement with EagleBurgmann, and quoting a component against one of its designations implies no approval by the maker and no claim of interchangeability. EagleBurgmann describes itself as a joint venture of the German Freudenberg Group and the Japanese Eagle Industry group, formed in 2004 out of the alliance between Burgmann Industries and Eagle Industry, with its head office at Wolfratshausen.
Submit your RFQ now.
Send your EagleBurgmann mechanical seal request — the type code as marked on the seal or pump documentation (MG, M7N, H7N/H12N, HJ-series or similar), the shaft size measured in place, and a photograph of the removed seal. Vessel Core reviews the supply route and prepares a structured supply quotation.
