We manufacture our own complete line of Cartridge, Assembly style Mechanical Seals for Industrial Pumps, Compressors, Mixers, Agitators, Reactors and Beadmill units.
We can repair / replace all makes & models of Mechanical Seals used on Pumps / Compressors / Mixers / Agitators / Reactors & Beadmill units.
Custom Design / Manufacture Mechanical Seals for any application to increase run cycles.
Provide Fluid Sealing Solutions for all industries.
We also provide Custom Engineered parts made from Tungsten Carbide, Silicon Carbide, Ceramic - for use in Shaft Steady Bushings / Wear Plates and many other industrial applications.
A chemical plant in New Mexico sent this 120mm Nippon Pillar seal into our
Texas repair facility for overhaul.
Seal had Tungsten Carbide vs Tungsten
Carbide on inboard end and Carbon Graphite vs Tungsten Carbide on outer
The outer stationary Carbon Graphite seal face was chipped out and
cracked. The (3) Tungsten faces required clean up & relap
2 Helium light bands.
We machined a new Carbon Graphite seal face
All the metal parts required clean up & polish on o’ring sealing
One of the wavesprings was damaged and required replacing.
Robco of America had a new wavespring manufactured to our specifications
to supply adequate seal face pressure.
Seal was re-assembled & passed
our 60 PSIG pressure test.
Seal is back in operation.
A chemical batch processing plant in Oklahoma sent this 110mm Burgmann
double mixer seal in to our Texas repair facility for inspection & overhaul.
Upon inspection we found the two rotary Carbon Graphite seal faces were
worn and the two stationary Silicon Carbide seats were chipped & cracked.
A pump repair company in Illinois sent these two 3.00" Cartridge seals in
to our repair facility for emergency overhaul. They had Carbon stationary
seal faces running against rotary Silicon Carbide seats. They had wave
springs behind the stationary Carbon seal faces and Viton o’rings.
Carbon seal faces were severely worn and required replacement. We
machined new Carbon seal faces in house. The Silicon Carbide seats
were re-ground & lapped flat within 2 helium light bands.
Viton o'rings, setscrews, setsclips and drive pins installed.
All metal parts
were re-machined and polished on o'ring sealing surfaces.
were re-assembled and pressure tested to 60 psig for 10 min. with no
loss of pressure.
Repair job was turned around in two working days
due to customer losing production.
A company in Italy contacted Robco of America in regards to designing &
manufacturing some Silicon Carbide wearplates for an industrial centrifuge
application. Customer wanted a Hastalloy outer band press fitted onto the
We were able to turn the job around in 2 weeks due to
A chemical plant in Louisiana sent a 2.00" Chemineer (model HTN) double
mixer seal in for failure analysis and repair.
Upon inspection we found the
product side stationary Silicon Carbide seat had cracked and chipped out
causing the barrier fluid to leak into the mixing tank.
Silicon Carbide seats
are prone to chipping out and cracking in the area where they engage an
anti rotation pin.
We made the recommendation to change out for a Tungsten
Carbide seat after confirming the product would not physically attack the
Tungsten material. Tungsten Carbide will not chip out or fracture due to pin
We machined new Carbon Graphite rotary seal faces and
swapped out the outboard end stationary Silicon seat for a Tungsten Carbide
All o'ring sealing surfaces were polished and we installed a new bearing
and lip seals.
The seal was re-assembled and pressure tested to 60psig for
15min. with no pressure drop.
The Chemineer HTN seal has been back in
operation for 9 months.
A chemical plant in Alabama sent a 95mm Netzsch double Beadmill seal in
It was in extremely poor condition.
We had a new product side
wear plate made from solid Tungsten Carbide to replace the old Chrome
coated plate. Both rotary coated seats were replaced with solid Tungsten
Carbide seats. A new product side stationary Tungsten Carbide seal face
installed. On the outer end we machined a new Carbon Graphite stationary
seal face. A new rotary seal sleeve was made. The Netzsch double seal
uses two end caps that are installed around the Netzsch seal – we replaced
both of them, machined from 316 Stainless.
The seal was re-assembled
& pressure tested to 80 psig for 15 min. – no pressure drop.
A pump company in Houston, Texas wanted a custom designed / manufactured
cartridge seal to install in a vertical pump for a municipal water district.
having issues with the original seals failing prematurely due to the pump shaft
steady bushings wearing out too quickly.
We designed a cartridge seal that had a
heavy duty built in shaft steady bushing machined from a metallized carbon graphite
with built in internal channels to help increase fluid through around the bushing.
seal has been running for 5 years – the original seals were failing after 4 – 6 months.
All the pumps in this municipal district have been overhauled and have the Robco
designed seals installed.
A company in the Middle East contacted Robco of America to see if we could fix
some issues with a set of Pratt & Whitney turbine bearing seal assemblies.
user was having issues with the quality of work being carried out at a repair facility
We designed custom lapping equipment to rework the Carbon seal rings
and meet the required tolerances.
The turbine bearing seal assemblies were shipped
back to the Middle East and are now in operation.
End user informed Robco of America
they will send all future assemblies to us for overhaul.
A chemical processing facility in Louisiana called Robco of America in regards to a
failed lower steady bushing assembly in the bottom of a 15,000 Gal. mixing tank.
went to the facility and told the customer we could replicate the assembly and improve
upon the materials of construction. We went with a Stainless outer stationary housing
and a Ni-Resist insert. Customer stated they were losing production for their largest
account and wanted the job expedited.
We turned the job around in 36 hrs. by putting
in a nightshift. We made the recommendation to customer to have a spare bushing
assembly on site which they agreed upon.
Chemical processing plant in Puerto Rico sent this 95mm double reactor seal with lower
glass lined flange in for overhaul. It has Kalrez o’rings for the high operating temps.
(440 deg. F.) Tungsten Carbide vs Silicon Carbide on product side. Carbon Graphite vs
Tungsten on outer end.
Reason for seal failure was the worn lower shaft steady bushing
in the bottom of the 20,000 Gal. tank. This allowed the shaft to rotate outside of allowable
We replaced the seal faces and seats. Machined a new double walled
seal housing which allows for the addition of cooling fluids to control temps. in the seal,
installed new Kalrez o’rings.
Mechanical Seal was re-assembled and pressure tested to 80psig for
15 min. – no pressure drop.
80mm Netzsch Double Mill Seal sent in for overhaul from chemical plant in Kentucky.
This unit had Silicon Carbide vs Silicon Carbide on both the product side and the outer end.
The Silicon Carbide seal faces & seats were chipped / cracked around the drive pin slots.
We advised the customer to upgrade material of construction to Tungsten Carbide which
is less prone to chipping / cracking. The end user agreed and we had new seal faces and
Seal was repaired and pressure tested to 80 PSIG. Unit is now
back in operation.
3.00” Double Mixer Seal sent in for emergency repair from chemical plant
in Pasadena Texas.
Rotary Silicon Carbide seal faces were worn & chipped out. Stationary
product end Silicon Carbide
seat was worn and chipped.
Rotary seal sleeve was worn and pitted on o’ring sealing surfaces, new sleeve required.
This seal has Kalrez o’rings on product end due to elevated operating temps. (+400F).
Robco of America had a repair kit on the shelf
for this emergency overhaul.
turned around in (2) working days.
Chemical plant in North Carolina sent a failed 100mm Double Mixer Seal in for replacement.
We reverse engineered and provided a replacement mechanical seal unit. We upgraded the
seal faces to Tungsten vs Silicon from original Silicon vs Carbon. Seal has
been back in operation for 2 yrs.
Robco manufactured a new 4.00” double seal unit and reverse engineered the worn out
lower shaft steady bushing assembly. Robco oversaw the installation of both the
seal & bushing unit.
3.75" Robco EV05 single spring cartridge seals installed on (2) split case pumps – ready
to transport to North Carolina.
1.75" Robco seals being installed at airport fuel depot in Louisiana.
Thrust bearing & Pivot shoe set repaired & relapped flat within two Helium Light bands
for Deepwell Submersible Pump operating in Gulf of Mexico.
4.00" Robco EV07 Double Cartridge Seal being installed on a Reactor unit at a
chemical plant in south Texas.