Gaskets, plates, tube bundles, tubes, tubesheets, channel covers and anodes, made to fit the exchangers you already run. Supplied by AMI Exchangers and delivered to your site in the GCC by Petromarsh.
Tap a part to see what it is and when it is replaced. The red line shows how the gasket routes one fluid across a plate, from one port to the other.
Heat transfer plate. Pressed to the original pattern, port layout and thickness. The gasket groove runs round the edge and round the two ports that this plate seals off.
Plate gasket. Moulded in one piece to fit the groove. It seals the plate edge and the ports, and decides which fluid flows across this plate. Glued or clip-on.
Tube. Supplied to the original outside diameter, wall thickness and length, plain or U-bent, in copper alloys, titanium, stainless or carbon steel.
Sacrificial anode. Screwed or bolted into a seawater water box. It corrodes in place of the tubesheet and box, so it is checked at every inspection.
Tie bolts, nuts and washers. For plate exchanger frames and channel covers. Replaced when threads are worn or corroded, so the pack can be tightened evenly.
Tubesheet. Drilled to the original tube layout and pitch, with bolt holes or a weld preparation to suit the shell and channel.
Spiral wound gasket. For channel covers and nozzle flanges. Never reused: a new one is fitted each time the joint is opened.
Tube plugs. Tapered plugs in the tube material, to seal leaking tubes until the next planned re-tube.
Exchangers need a small set of parts that wear: gaskets every time a unit is opened, anodes as they waste away, and tubes or plates when corrosion wins. Holding the right spares turns a long shutdown into a short one.
Plate gaskets harden and lose their seal with heat and age. Anodes in seawater water boxes are consumed by design. Joint gaskets on channel covers are replaced each time the joint is opened.
Plates crack or pit, tubes thin or split, and tubesheets corrode around the tube holes. These parts need the exact geometry and material of the original.
For plates and gaskets, the maker, model and plate code identify the part. For shell-and-tube parts we work from the nameplate, the drawing or measurements taken on site.
Pick a family to see what it covers, how we identify the right part, and when it should be replaced.
Moulded elastomer gaskets that seal each plate and route the fluids. Clip-on (glue-free) gaskets are quicker to fit; glued gaskets suit some older plate designs. The material is chosen for the fluid and temperature.
Re-gasketing seawater and lube oil plate coolers during planned shutdowns.
Replacement plates pressed to match the original pattern, port layout and thickness, in stainless steel, titanium or high alloys. Supplied with or without gaskets fitted.
Replacing leaking plates found by a dye penetrant check during cleaning.
New bundles with tubes, tubesheets, baffles and tie rods, built to fit the existing shell and nozzles. A spare bundle lets you swap and repair the old one off-line.
Critical coolers where a spare bundle keeps the plant running.
Tubes for re-tubing and repairs, supplied to the original diameter, wall and length. Non-ferrous tubes such as copper-nickel, brass and titanium are a specialty of AMI Exchangers.
Re-tubing condensers and coolers in seawater service.
New tubesheets drilled to the original tube pattern and pitch, with bolt holes or weld preparation to suit. Clad tubesheets are available for seawater and corrosive duty.
Building replacement bundles for exchangers with no drawings.
Channel covers, bonnets, water boxes and pass partition plates, made from the original drawing or by measuring the old part. Coatings or linings for seawater can be added.
Replacing corroded water boxes on seawater coolers.
Sacrificial anodes screwed or bolted into water boxes corrode in place of the tubesheet and box. Zinc and aluminium are common; soft iron anodes are used with copper alloy tubes because the iron helps a protective film form on the tubes.
Seawater coolers and condensers on platforms, ships and coastal plants.
Most plate exchanger failures start with the wrong gasket or plate material for the fluid and temperature. Use this as a first guide; the final choice depends on the exact fluid and its temperature.
| Material | Use it for | Limits | Avoid |
|---|---|---|---|
| NBR (nitrile) | Water, seawater, mineral oil, fuelsgasket | Up to about 110 to 140 °C, by grade | Steam, ozone, strong acids, ketones |
| EPDM | Hot water, steam, glycols, many acids and alkalisgasket | Up to about 150 to 160 °C, by grade | Mineral oils, fuels and hydrocarbons |
| FKM (Viton) | Hot oils, fuels, many acids and chemicalsgasket | Up to about 180 °C | Steam and hot water, ketones, amines |
| HNBR | Hot oils, lube oil, sour hydrocarbons, watergasket | Up to about 150 °C | Strong acids, ketones |
| Stainless 304 / 316 | Fresh water, oils, mild process fluidsplate · SA-240 | Pitting and crevice corrosion in warm chlorides | Seawater and hot brackish water |
| Titanium | Seawater, brines, chloride solutionsplate · Grade 1 · SB-265 | Excellent in seawater at normal cooling temperatures | Fluorides and hydrofluoric acid, dry chlorine |
| SMO 254 | Brackish water, chloride process streamsplate · UNS S31254 | Much better chloride resistance than 316 | Hot seawater where titanium is the safer choice |
| Hastelloy C-276 | Strong acids, wet chlorine, aggressive chemicalsplate · UNS N10276 | Very wide chemical resistance, high cost | Clean duty where 316 or titanium will do |
Spare parts follow the code of the original exchanger, plus your company specification where one applies.
Requirements for plate-and-frame exchangers in oil and gas service, including plates and gaskets.
Replacement pressure parts are built to the code of the original exchanger.
Spiral wound, ring joint and jacketed gaskets for flanges and channel covers.
Non-metallic flat gaskets for pipe flanges.
Copper alloy, titanium and stainless tube specifications.
Stainless, titanium and nickel alloy sheet for plates.
Zinc anode alloy, and galvanic anodes for cathodic protection in seawater.
Material limits for parts exposed to hydrogen sulphide.
Certified mill certificates for plates, tubes and pressure parts.
We identify the part first, from the nameplate, drawings or measurements. Your engineers approve the scope before manufacture, and you can witness the tests. Tap a step to see what happens and which documents you receive.
Petromarsh supplies gaskets, plates and parts for all known exchanger makes through AMI Exchangers, which has completed more than 25,000 projects and supplies non-ferrous tubes for re-tubing. Petromarsh is their exclusive representative in the GCC.
A photo of the nameplate and the worn part is often enough to identify it. Add the items on the right if you have them.
