In short: a seawater intake must take in millions of cubic metres a day and keep out jellyfish, seaweed, sand and fish, without clogging or harming marine life. A passive wedge-wire screen does it with no moving parts. BTGC supplies Elgin Separation Solutions intake screens, built for the high salinity and bio-fouling of the Gulf and Red Sea.

Every desalination plant and every coastal power station in the Kingdom begins with an intake. Debris that passes the intake blocks pumps, fouls condensers and shuts down trains. Traditional travelling band screens catch it, but they have motors, chains and sprays to maintain, and they collect marine life that must be handled and returned.

How a passive screen works

A passive screen is a cylinder of wedge-wire with precisely sized slots, mounted on the intake pipe below the water. Water enters through the slots at a low velocity, typically below 0.15 m/s. At that speed fish and swimming organisms can move away, and debris is not pulled onto the screen. There is no motor and no moving part; periodic air-burst cleaning clears any build-up.

Coanda screens for debris-heavy flows

Where the water carries heavy debris, a Coanda screen uses the way water clings to a curved surface. The flow runs over a curved, tilted wedge-wire panel; water drops through the slots and debris slides off the end. The screen cleans itself continuously. In the BTGC catalogue it is listed for cooling water security in power plants.

Built for the Gulf and the Red Sea

The catalogue specifies high-durability stainless steel and copper-nickel for the screens. Copper-nickel resists bio-fouling, which matters in warm, highly saline water where marine growth is fast. Slot size, screen diameter and material are selected for each intake from the flow, the water quality and the local marine species.

Elgin Separation Solutions from BTGC

Elgin Separation Solutions of the USA, part of the TerraSource Global group, supplies water intake and solid-liquid separation equipment. The range BTGC supplies in the Kingdom covers:

• Passive and Coanda intake screens for seawater abstraction and cooling towers

• Vertical cuttings dryers that recover up to 95 % of synthetic drilling fluid

• Decanter centrifuges for mining tailings, sludge and oily water

• Vibrating screens for aggregate classification

Applications in the BTGC catalogue are desalination intake protection, upstream oil and gas and industrial wastewater. See our page for Elgin Separation Solutions in Saudi Arabia and the full process and separation offer.

Upgrading an existing intake

BTGC's project team handles intake screen upgrades as brownfield retrofits: survey, screen selection, fabrication, marine installation coordination and commissioning, without changing the plant footprint. This is listed in the catalogue under cooling and filtration upgrades.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports power and water utilities on both coasts. For a quotation send the design flow, the intake depth and location, the water quality data and the species to be protected.

Questions buyers ask

What slot size? It depends on the pump and downstream equipment; common slots are 1 to 10 mm. Smaller slots need a larger screen to keep the velocity low.

How is bio-fouling controlled? Copper-nickel construction, air-burst cleaning and, where needed, a chlorination point at the screen.

Are screens made to order? Yes, each screen is sized for its intake.

Contact BTGC

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

In short: a check valve that closes late slams shut against reverse flow and sends a pressure wave down the line. Non-slam designs close before the flow reverses. BTGC supplies KSB check valves, butterfly valves and gate valves for water transmission and power plant cooling water.

Saudi Arabia pumps potable water from coastal desalination plants to cities hundreds of kilometres inland, through some of the longest water transmission lines in the world. Every pumping station on those lines has check valves, and a check valve that slams is one of the most common causes of damage to pumps, pipes and supports.

Why check valves slam

When a pump stops, the water in the line decelerates and then starts to flow back. A conventional swing check valve closes only when reverse flow pushes the disc shut. By then the water is already moving backwards; the disc hits the seat and stops the column instantly. The result is a pressure spike, the bang that operators call slam, and over time cracked bodies, broken hinge pins and loosened pipe supports.

How a non-slam valve works

A non-slam check valve closes while the forward flow is still decelerating, before any reverse flow develops. Three design elements make this possible:

Nozzle check valves and spring-loaded dual-plate designs are the common non-slam types. For very long lines, the check valve is part of a surge protection scheme with surge vessels and controlled-closing butterfly valves.

KSB valves from BTGC

KSB of Germany is one of the world's largest manufacturers of pumps and valves and a leading supplier to the water and power sectors. The range BTGC supplies in the Kingdom covers:

• Non-slam check valves for large pumping stations

• Centric, double-offset and triple-offset butterfly valves for water, gas and process

• Gate and globe valves to DIN and ANSI standards for power plants and general industry

Applications in the BTGC catalogue are SWCC water transmission lines, power plant cooling water and general industry. See our page for KSB valves in Saudi Arabia and the full industrial valves offer.

Local content

Alongside KSB, BTGC supplies locally made water valves from AVK's Saudi facility and locally assembled Crane valves, so a water project can meet local content targets within one package. Ask BTGC to split the valve list between imported and locally made items.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports water and power utilities from the Gulf and Red Sea coasts, with valve testing and repair at the service center in Jubail. For a quotation send the line size, pressure class, flow and the pump trip scenario; BTGC can arrange a surge study for the station.

Questions buyers ask

Is a dual-plate check valve non-slam? Spring-loaded dual-plate valves close quickly and are used as non-slam valves on many lines; for the largest pumps a nozzle check valve is the safer choice.

Can slam be fixed without replacing the valve? Sometimes with a damper or a spring upgrade; usually the lasting fix is a non-slam design.

Does BTGC supply the surge vessels too? Yes, surge vessels and controlled-closing butterfly valves are part of the water package.

Contact the BTGC valve team

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

In short: when a turbine trips, the main steam isolation valve must close fast and seal tight against superheated steam, then survive the thermal shock. Okano Valve Mfg. Co., Ltd. builds these valves for thermal and nuclear plants worldwide, and BTGC supplies them in the Kingdom.

Thermal power plants in Saudi Arabia run steam at pressures and temperatures that destroy ordinary valves. The main steam line between boiler and turbine carries superheated steam continuously for years, and then, in an emergency trip, the isolation valve must close within seconds to protect the turbine. Few components in the plant face both duties.

What the valve must survive

• Continuous high temperature. Superheated steam softens ordinary seat materials and lets them gall.

• Thermal shock. A fast closure on a trip, or a cold start, puts a sudden temperature gradient across the seat and body. Seats crack if the hard-facing is poorly bonded.

• Tight shutoff. Any leak past the seat during an outage means steam reaching a stationary turbine.

• Long service. The valve is in the critical path; replacing it means an outage.

Design features that matter

Okano valves from BTGC

Okano Valve Mfg. Co., Ltd. of Kitakyushu, Japan, has made high-pressure, high-temperature valves since 1926 and is a benchmark for critical isolation in thermal and nuclear power generation. The range BTGC supplies in the Kingdom covers:

• Forged and cast steel gate and globe valves with full Stellite hard-facing

• Main steam isolation valves (MSIV) for turbine protection during emergency trips

• Safety and relief valves for boilers and superheaters

• Swing, tilt and lift check valves for high-velocity steam lines

Applications in the BTGC catalogue are supercritical thermal power plants and high-pressure steam distribution. See our page for Okano valves in Saudi Arabia and the full industrial valves offer.

Spares and overhaul planning

Steam valves are overhauled at major outages. BTGC verifies long-lead spares, such as discs, seats and stems, months before the outage window, and can hold them in the Kingdom under a supply agreement. The service center in Jubail carries out seat lapping, hydrostatic testing and safety valve pop-testing to API 527 after overhaul.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports power generation and utilities from three branches, with the valve repair center in Jubail. For a quotation send the line size and class, the steam pressure and temperature, the valve type and the closing time required by the turbine protection system.

Questions buyers ask

Gate or globe for main steam isolation? Gate for isolation with full bore; globe where throttling or drain duty is needed. Parallel slide gate valves are the usual choice for main steam.

Can an existing MSIV be repaired? Seats and discs can be re-lapped or replaced if the hard-facing is sound. Cracked hard-facing means a new disc or seat ring.

Which standards apply? ASME B16.34 for pressure-temperature ratings and API 598 for inspection; BTGC provides the test certificates.

Contact the BTGC valve team

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

In short: a transformer enquiry that states the rating, voltages, cooling class, tap changer, bushings and test requirements gets a correct offer first time. BTGC supplies HD Hyundai Electric power transformers up to 765 kV and GIS switchgear for utility and industrial substations in the Kingdom.

A power transformer is the most expensive single item in a substation and the one with the longest lead time. An incomplete enquiry means a round of clarifications before the manufacturer can even price it. This checklist is written for the project buyer and the electrical engineer who prepare the RFQ.

The checklist

Ambient temperature is the Saudi difference

Most international ratings assume a 40 °C maximum ambient. Saudi sites see 50 °C and more. A transformer must either be rated for the real ambient or derated on site. State the design ambient in the enquiry and ask for the rating at that temperature, not the catalogue figure.

HD Hyundai Electric from BTGC

HD Hyundai Electric Co., Ltd. of Korea is a tier-one supplier to utility grids and delivers the infrastructure behind power transmission. The range BTGC supplies in the Kingdom covers:

• Large oil-filled power transformers up to 765 kV for substations and power plants

• Gas insulated switchgear (GIS) for high voltage distribution where space is limited

• High voltage motors and generators for industrial applications

Applications in the catalogue include SEC substations, independent power projects and heavy industrial power distribution. See our page for HD Hyundai Electric in Saudi Arabia and the full electrical and power systems offer.

How BTGC handles a transformer package

For a project order BTGC assigns a project manager, an expeditor, a document controller and a QA/QC engineer. The team manages the vendor document list, reviews inspection and test plans, attends factory tests and handles customs clearance to the laydown area. This is the project support described in the BTGC catalogue, and it is how a transformer arrives on the date the schedule says.

BTGC support in Dammam, Jubail and Yanbu

BTGC serves power and water utilities and industrial plants from three branches. Spares such as bushings, gaskets and tap changer contacts can be held in the Kingdom under a supply agreement.

Questions buyers ask

Can BTGC supply distribution transformers too? Yes, locally built distribution transformers up to 36 kV are in the BTGC range alongside the HD Hyundai Electric power transformers.

Who attends the factory test? BTGC's QA/QC engineer, with the client's inspector if required.

What is the lead time? It depends on rating and voltage; large units are long-lead items, so BTGC verifies them months before the installation window.

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: seawater destroys ordinary valves by corrosion, and large transmission lines destroy them by water hammer. A rubber-lined, double-eccentric butterfly valve answers both. BTGC supplies Nakakita Seisakusho Co., Ltd. butterfly valves up to 3000 mm for desalination and water transmission.

Saudi Arabia moves more seawater than almost any country on earth. Every desalination plant on the Gulf and the Red Sea takes in seawater through intake lines, passes it through pumps and membranes or evaporators, and sends potable water inland through pipelines that run for hundreds of kilometres. At every point a valve isolates, regulates or protects the line, and seawater attacks each one.

Two problems in one valve

Corrosion. Gulf seawater is warm and highly saline. Unprotected carbon steel pits within months; even some stainless grades suffer crevice corrosion. The valve seat and disc edge, where flow is fastest, go first.

Water hammer. When a pump trips or a valve closes too fast on a long line, the column of water keeps moving and then reverses. The pressure spike can crack valve bodies and lift pipe supports.

What a seawater butterfly valve needs

Nakakita valves from BTGC

Nakakita Seisakusho Co., Ltd. of Japan has built valves and fluid control systems since 1930. The range BTGC supplies in the Kingdom covers:

• Concentric and double-eccentric rubber-lined butterfly valves for seawater and utility service, up to 3000 mm

• High-lift safety valves for boiler and steam protection

• Remote control systems: hydraulic power units and consoles to operate valves in inaccessible places

• Cargo handling valve systems for liquid loading and unloading

In the Kingdom these valves serve desalination intake and outfall, water transmission lines and tank farm automation. See the range on our page for Nakakita valves in Saudi Arabia and the full industrial valves offer.

Non-slam check valves complete the line

A butterfly valve regulates and isolates; a non-slam check valve protects the pump when flow reverses. BTGC supplies both, so a pumping station can be specified as one package. Ask for the surge analysis with the valve offer on any long transmission line.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports power and water utilities across the Kingdom from Dammam on the Gulf and Yanbu on the Red Sea, with the service center in Jubail for valve testing and repair. For a quotation send the line size, pressure rating, fluid (seawater, brine or potable), the actuation required and the closing time.

Questions buyers ask

Rubber lining or coating? A bonded rubber lining is thicker and resists abrasion from sand in the water; a coating is for lighter duty.

What closing time stops water hammer? It depends on the line length and velocity. BTGC can arrange a surge study for the pumping station.

Are spares held in the Kingdom? Seats and seals for common sizes are stocked; ask for the current list.

Contact the BTGC valve team

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

In short: where the air is full of dust, salt or heat, an air-cooled motor runs hot and fails early. A water-jacket cooled motor takes its cooling from the plant water circuit and ignores the air around it. BTGC supplies WEG WGM motors and services them at the WEG approved service center in Jubail.

Large motors in Saudi plants work in air that is hot for most of the year and often loaded with dust or salt. In cement raw mills and kiln drives the dust blocks cooling fins; at coastal desalination plants the salt corrodes them. Either way the motor runs above its design temperature, the insulation ages faster and the winding fails years before it should.

Why air cooling struggles here

An air-cooled motor moves heat from its windings to the frame, and from the frame to the air through fins and a fan. Three things defeat it in the Kingdom:

• Ambient air above 45 °C leaves little margin before the insulation limit.

• Dust settles on the fins and acts as a blanket.

• Salt-laden air corrodes fins and fan guards, cutting airflow year after year.

The usual answer, a larger motor or a derated one, costs more and takes more space.

How a water-jacket cooled motor works

A water-jacket cooled motor has a cooling circuit cast into or wrapped around its frame. Plant cooling water passes through the jacket and carries the heat away. The motor needs no external fan and no clean air. Its temperature follows the water temperature, not the ambient air.

WEG WGM motors from BTGC

WEG builds the WGM series of water-jacket cooled motors for exactly these conditions. The range BTGC supplies in the Kingdom covers:

• WGM water-jacket cooled induction motors for pumps, fans and mills

• High voltage M-Line and W60 motors up to 50 MW for compressors and large pumps

• M-Mining slip ring motors for high-inertia starts on cement kilns and raw mills

• W22 and W22X low voltage motors, including explosion-proof designs

• MVW medium voltage drives and SSW soft starters to match

Typical Saudi applications in the BTGC catalogue are SWCC desalination pumping and cement production areas where ambient dust and heat make air cooling impossible. See the range on our page for WEG motors in Saudi Arabia and the full electric motors and drives offer.

Replacing an old motor without civil work

Most enquiries BTGC receives are replacements, not new installations. The new motor must fit the old foundation, shaft height and coupling. BTGC designs and fabricates transition bases and adapter plates so the new WEG unit bolts onto the existing foundation, with no re-grouting. The catalogue calls this the drop-in program: a shutdown measured in days rather than weeks.

BTGC support in Dammam, Jubail and Yanbu

BTGC has supplied WEG motors to Saudi industry for years and operates the WEG approved service center in Jubail. The center rewinds, overhauls, balances and load-tests LV, MV and HV motors up to 10 MW and 13.8 kV, with Class H and F insulation systems built for desert heat. Field teams cover power and water utilities, petrochemical plants and cement works from the Dammam, Jubail and Yanbu branches.

To quote a replacement, send us the nameplate photo, the duty (pump, fan, mill), the ambient conditions and the cooling water available.

Questions buyers ask

Does a water-cooled motor need special water? It needs clean cooling water within the temperature and flow limits on the datasheet. Most plants take it from the existing closed cooling circuit.

Can it replace an air-cooled motor of the same frame? Often yes, with an adapter base. BTGC checks the shaft height, flange and terminal box position before quoting.

Who repairs it in the Kingdom? The BTGC service center in Jubail, which is WEG approved.

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.