In short: sulfuric and hydrochloric acid attack most metals, and exotic alloys are expensive and still not immune. A valve lined with PFA or PTFE puts an inert plastic between the acid and the steel. BTGC supplies Crane ChemPharma & Energy lined ball, butterfly and check valves, with local assembly in Dammam.

Acid plants, chlor-alkali units and chemical distribution networks in Jubail and Yanbu handle fluids that corrode carbon steel in days and stainless steel in months. The choice for the valve engineer is between an exotic alloy body, which costs several times a steel valve, and a steel valve lined with a fluoropolymer.

How a lined valve works

The body is cast steel or ductile iron for strength. Every wetted surface is covered with a thick, bonded layer of PFA or PTFE. The acid never touches the metal. The lining is moulded, not sprayed, so it has no pinholes and extends through the flange faces to seal against the pipe lining.

Where a lined valve is the wrong choice

• Temperatures above the lining limit, around 200 °C for PFA

• Vacuum service that can pull the lining away from the body, unless the valve is vacuum-rated

• Abrasive slurries that cut the lining; a Saunders diaphragm valve with a rubber lining suits those

• Full-bore, high-pressure pipeline duty, where a metal-seated ball valve is the answer

Crane ChemPharma & Energy from BTGC

Crane ChemPharma & Energy is a portfolio of engineered valve brands for chemical and energy service, with strong local support in Saudi Arabia. The range BTGC supplies in the Kingdom covers:

• PFA and PTFE lined ball and butterfly valves for corrosive acids and chlor-alkali

• Xomox sleeved plug valves, cavity-free, for polymer units and fouling media

• Saunders diaphragm valves, industrial and aseptic, for slurries and high-purity service

• High-performance butterfly and check valves for utility and process lines

Crane assembles and tests process valves locally in Dammam, which shortens lead times and supports local content targets. See our page for Crane valves in Saudi Arabia and the full industrial valves offer.

Stocking in Jubail

BTGC holds PFA-lined valves and spares in Jubail for the petrochemical complexes nearby, so a failed valve on an acid line can be replaced without waiting for an import. Ask for the current stock list by size and class.

BTGC support in Dammam, Jubail and Yanbu

BTGC supports the petrochemical plants of Jubail and Yanbu from branches in both cities, with the valve test center in Jubail. For a quotation send the fluid and concentration, temperature, pressure, line size and the pipe lining material.

Questions buyers ask

PFA or PTFE? PFA is moulded and handles higher temperature; PTFE is the economical choice for moderate duty. BTGC selects by fluid and temperature.

How is the lining inspected? By spark testing for pinholes before shipment; test certificates are supplied.

Can lined valves be repaired? Liners are replaced as a unit; BTGC advises when replacement is cheaper.

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.