In short: sour crude, seawater cooling and chloride-rich streams corrode carbon steel exchangers from the inside. The fix is the right alloy in the right place, tube side or shell side, built to TEMA. BTGC supplies Hemaco engineered shell and tube exchangers and pressure vessels, custom-built in carbon steel, stainless and exotic alloys.

Shell and tube exchangers do the heavy lifting in refineries, gas plants and petrochemical complexes: crude preheat, overhead condensing, reboiling, gas compression cooling. They run at pressures and temperatures that plate exchangers cannot, and they handle fouling fluids. Their weakness is corrosion, and in the Kingdom the corrosive fluids are everywhere.

Where carbon steel fails

The alloy goes where the corrosive fluid is. A titanium tube bundle in a carbon steel shell costs a fraction of an all-titanium unit and lasts as long, if the water is on the tube side.

Built to TEMA

The Tubular Exchanger Manufacturers Association standards define the construction classes, R for refinery service, and the mechanical details that make an exchanger maintainable: tube pitch, baffle spacing, pass partitions, removable bundles. Specify the TEMA class and type, for example BEU or AES, in the enquiry, with the ASME Section VIII design code.

Hemaco from BTGC

Hemaco of Italy designs and fabricates shell and tube heat exchangers and pressure vessels to TEMA and ASME. The range BTGC supplies in the Kingdom covers:

• Shell and tube exchangers custom-built in carbon steel, stainless steel and exotic alloys

• Pressure vessels: separators, columns and reactors for oil and gas

• Air-cooled exchangers to API 661, fin-fan coolers for process cooling

Applications in the BTGC catalogue are refinery process units, petrochemical feed heaters and gas compression coolers. See our page for Hemaco in Saudi Arabia and the full thermal management and cooling offer.

Replacement bundles and re-engineering

When the original manufacturer has gone or the drawings are lost, BTGC's asset re-engineering service captures the bundle geometry by 3D laser scan, reviews the metallurgy, and often recommends a better alloy than the 30-year-old original. The new bundle is fabricated to the measured dimensions and delivered in weeks rather than the year quoted for legacy OEM support.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports oil and gas refineries at Ras Tanura, Jubail and Yanbu from branches near all three. For a quotation send the TEMA datasheet or the thermal duty, design pressure and temperature, the fluids and their corrosion concerns, and the existing drawing if it is a replacement.

Questions buyers ask

Duplex or super duplex? Duplex handles most chloride streams; super duplex for hotter, more concentrated chlorides and seawater at temperature. BTGC and Hemaco select by the process data.

Can Hemaco work to Aramco standards? BTGC's document controllers manage the vendor document list against Aramco SAMSS and SAES and SABIC SES requirements.

Are Hemaco units inspected before shipment? Yes, BTGC's QA/QC engineer coordinates third-party inspection and attends the factory test.

Contact BTGC

Email info@btc-ksa.com or call +966 13 856 0528. Branches: Dammam, Jubail and Yanbu. Request a quote.

In short: a plate exchanger wins on size, efficiency and cleaning for liquid-to-liquid duties; shell and tube wins on pressure, temperature and dirty or phase-change service; an air fin cooler wins where water is scarce. BTGC supplies all three from Kelvion.

Heat transfer sets plant profitability. An exchanger that fouls, leaks or under-performs costs energy every hour and production at every cleaning. The choice between the three main types is made at the specification stage, and it is worth getting right.

The three types compared

Saudi conditions change the answer

• Seawater cooling. Titanium plates or tubes resist Gulf seawater; the plate exchanger's small size suits coastal plants.

• Scarce water inland. Air fin coolers remove the water requirement, at the price of a larger footprint and lower performance on the hottest afternoons.

• High ambient. An air cooler sized for 40 °C under-performs at 50 °C; state the design ambient in the enquiry.

• Dust. Air-side fouling needs a cleaning schedule and, on critical units, a wash system.

Kelvion from BTGC

Kelvion Holding GmbH of Germany, formerly GEA Heat Exchangers, offers one of the world's largest portfolios of heat transfer technology. The range BTGC supplies in the Kingdom covers:

• Gasketed, brazed and fully welded plate heat exchangers

• Air fin coolers for refineries and gas plants where water is scarce

• Shell and tube exchangers for high-pressure and critical process duties

Applications in the BTGC catalogue are oil and gas processing, power plant condensers and marine cooling. See our page for Kelvion in Saudi Arabia and the full thermal management and cooling offer.

Spares and retubing

Most heat exchanger enquiries BTGC receives are for plates, gaskets, tube bundles and retubing rather than new units. BTGC supplies genuine plates and gaskets, and manages bundle replacement as a turnaround package with pre-shutdown inspection and kitting by tag number.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports petrochemical and oil and gas plants from three branches. For a quotation send the duty: both fluids, flow rates, inlet and outlet temperatures, allowable pressure drops, design pressure and temperature, and the fouling allowance.

Questions buyers ask

Can a plate exchanger replace a shell and tube unit? Often, for liquid-to-liquid duty within the gasket limits, and it saves space and energy. Not for high-pressure or condensing duty.

What about Hemaco for shell and tube? BTGC also supplies Hemaco engineered TEMA exchangers, built to order in carbon steel, stainless and exotic alloys.

How fast are plates and gaskets available? Common sizes are stocked or on short lead time; send the plate pattern and gasket material.

Contact BTGC

Email info@btc-ksa.com or call +966 13 856 0528. Branches: Dammam, Jubail and Yanbu. Request a quote.

In short: pulling an ordinary plug on a running motor draws an arc that can burn the technician and the contacts. A switch-rated plug breaks the circuit inside the socket before the plug comes out. BTGC supplies MARECHAL ELECTRIC DECONTACTOR plugs and sockets, including explosion-proof versions, in Saudi Arabia.

Plants are full of motors that are moved, swapped or serviced regularly: pumps on skids, conveyor drives, welding machines, portable fans and mobile generators. Each one is connected through a plug and socket, and each connection is a point where someone can be hurt.

The arc behind the plug

When a plug is pulled under load, the current does not stop at once. It jumps the widening gap as an arc. On a 400 A motor circuit the arc carries enough energy to burn skin, weld contacts and ignite gas. The usual safeguard is an upstream switch with an interlock, which adds cost, wiring and a second place to lock out.

What a switch-rated plug does

A DECONTACTOR combines the plug, the socket and the switch in one unit. Pushing the release button opens the switch inside the socket first; only then can the plug be withdrawn, and the pins are already dead. Plugging in reverses the sequence. The features that matter in a Saudi plant:

MARECHAL ELECTRIC from BTGC

MARECHAL ELECTRIC of France has made industrial connection systems since 1952, with nearly 100 patents behind the DECONTACTOR technology. The range BTGC supplies in the Kingdom covers:

• DECONTACTOR plugs and sockets with an integral load-break switch

• High-current connectors up to 700 A for mobile generators and shore power

• Explosion-proof plugs and sockets for ATEX and IECEx hazardous areas

Applications in the BTGC catalogue are mobile welding machines, pumps, conveyors and port and marine power. See our page for Marechal Electric in Saudi Arabia and the full electrical and power systems offer.

Where Saudi plants use them

• Steel mills and ports: overhead crane power connections and mobile equipment in melt shops, alongside the crane components BTGC supplies to the same plants.

• Oil and gas: hazardous-area connections for portable pumps and lighting.

• Water and utilities: submersible pump connections at lift stations.

• Construction mega-projects: temporary power distribution and generator connections.

BTGC support in Dammam, Jubail and Yanbu

BTGC stocks common ratings in the Kingdom and supplies the matching cable glands and mounting boxes. For a quotation send the current rating, voltage, number of poles, the environment (indoor, outdoor, hazardous zone) and whether a lockout is required.

Questions buyers ask

Do I still need an upstream isolator? The DECONTACTOR is rated as a motor circuit switch and local disconnect; check the plant electrical standard for the installation class.

Are hazardous-area versions certified? Yes, ATEX and IECEx certified models cover Zone 1, 2, 21 and 22.

Can old sockets be replaced one for one? Usually yes; BTGC checks the mounting dimensions and the keying.

Contact the BTGC power team

Email power@btc-ksa.com or call +966 13 856 0528. Branches: Dammam, Jubail and Yanbu. Request a quote.

In short: cavitation happens when the pressure inside a control valve falls below the liquid’s vapor pressure and the vapor bubbles collapse on the metal. The fix is a valve sized for the pressure drop, with staged trim and hard materials. BTGC supplies Motoyama Eng. Works, Ltd. severe service valves from Dammam, Jubail and Yanbu, and repairs valves in Jubail.

Control valve cavitation is one of the most common reasons a liquid control valve fails early. It shows up as noise, vibration and a damaged plug and seat, often within months of start-up. This guide explains what causes it, how to recognise it, and which valve designs stop it in refineries, petrochemical plants and utilities across the Kingdom.

What causes control valve cavitation

A control valve reduces pressure by forcing liquid through a narrow opening. At that point the liquid speeds up and its pressure falls sharply. If the pressure falls below the liquid's vapor pressure, vapor bubbles form. Downstream of the opening the pressure recovers, and the bubbles collapse against the metal.

Each collapse is small. Millions of them erode the plug, the seat and the valve body. The higher the pressure drop across the valve, the more severe the damage.

Cavitation is different from flashing. In flashing, the outlet pressure stays below the vapor pressure, so the bubbles do not collapse and the liquid leaves the valve partly as vapor. The two problems need different fixes, so it matters which one you have.

How to recognise it in the plant

Maintenance teams usually notice cavitation before they measure it. The common signs are:

• A noise like gravel passing through the pipe
• Vibration in the valve and the downstream piping
• A rough, pitted surface on the plug and seat when the valve is opened
• Unstable control at low valve openings
• Leakage through the seat soon after a repair

The services where it appears most often are those with a high pressure drop in liquid:

How to stop it

The lasting fix is to choose a valve built for the pressure drop, not to keep replacing trim.

1. Stage the pressure drop. Multi-stage and cage-guided trims take the drop in several small steps, so the pressure never falls below the vapor pressure.
2. Choose harder trim materials. Hardened trim resists the erosion that remains.
3. Check the sizing. An oversized valve works almost closed, where cavitation is worst.
4. Review the installation. More back-pressure downstream, or two valves in series, lowers the drop across each one.

Valve sizing and noise prediction follow IEC 60534, the international standard for industrial control valves. Ask for the sizing calculation with every offer.

Motoyama control valves for severe service

Motoyama Eng. Works, Ltd. of Japan builds globe control valves for exactly this duty. The range that BTGC supplies in the Kingdom includes:

• Heavy-duty globe control valves, cage-guided and top-guided, for precise throttling in severe service
• Trim designed to prevent cavitation at the high pressure drops found in hydrocracking and fractionation units
• Bellows seal valves for toxic and lethal media
• Cryogenic valves with extended bonnets for service down to -196 °C
• Safety relief valves for over-pressure protection

See the full range on our page for Motoyama control valves in Saudi Arabia, or browse all industrial valves for Saudi plants.

BTGC support in Dammam, Jubail and Yanbu

BTGC has served Saudi industry since 1996 and is the Motoyama Eng. Works, Ltd. partner in the Kingdom. We support oil and gas plants, petrochemical complexes and utilities from three branches, in Dammam, Jubail and Yanbu.

Our service center in Jubail carries out valve testing and repair in Jubail, including inspection, seat machining and pressure testing. The same center is the WEG approved service center in Saudi Arabia and offers full electric motor services: rewinding, overhaul, dynamic balancing and load testing. If a valve is already damaged, we can inspect it, report the cause and offer either a repair or a replacement.

To size a replacement valve, send us:

• The fluid, and its temperature and vapor pressure
• Inlet and outlet pressure at minimum, normal and maximum flow
• Line size and pressure rating
• The existing valve datasheet or tag number
• A short description of the problem

Questions buyers ask

Contact the BTGC valve team

Email valves@btc-ksa.com or call +966 13 856 0528. Branches: Dammam, Jubail and Yanbu. Request a quote and attach your datasheet.