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Stainless Steel Process Equipment
Pharmaceutical & Industrial Process Equipment

Stainless Steel Process Equipment

Stainless steel process equipment covers tanks, vessels, piping, valves and frames made in austenitic grades such as 304 and 316L, chosen for the product, the cleaning chemicals and the temperature they must withstand.

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Large insulated stainless-steel process vessel with an agitator drive and piping in an installed plant

Stainless Steel Process Equipment

The contents are liquids and solids that would rust or contaminate ordinary steel: fruit juice, brine, vegetable oil, herbal extract, milk, process water and caustic or acid cleaning solutions. A buyer should settle what the equipment holds and at what temperature, whether the liquid carries chlorides from salt, brackish water or cleaning chemicals, how it is cleaned, whether the surface must be polished for hygiene or can stay at mill finish, and whether the vessel runs under pressure or vacuum. Those answers fix the grade, wall thickness and finish, and they drive the price, because stainless is bought by weight and each step up in grade or polish adds cost. A proposal should name the exact grade and finish, not just say stainless.

Grade 304 serves most neutral, low-chloride duties. Grade 316 adds molybdenum for better resistance to pitting in chloride environments, and 316L, with its low carbon content, avoids sensitisation in welded parts. Even 316 can pit, crack or suffer crevice attack in hot, salty and stressed service, so a hot brine vessel needs its grade reviewed, and duplex grades are considered for severe duty. Welds matter as much as grade. Product-contact seams are continuous, shielded with inert gas on the inside so that no heat tint forms, and ground smooth, because an intermittent weld leaves a gap where residue collects. After welding, pickling and passivation remove iron contamination and restore the protective chromium oxide film, and the equipment is rinsed with low-chloride water. Surface finish should be stated as a roughness value, not as the word polished. A figure such as 0.8 µm Ra is a common hygienic target for dairy-type surfaces, and electropolishing is an optional extra. Design removes crevices: hollow frame sections are sealed, dead legs in piping are kept short, and tank bottoms slope to a low outlet. Tanks, jacketed vessels, pressure and vacuum vessels and piping each add their own design code and test.

Indicative Capacity Range

  • 0.5–20 m³ working volume

Key Specification Inputs

Design pressure, temperature, MOC, finish, applicable codes.

Technical Specifications

TechnologyFabricated austenitic stainless steel tanks, vessels, piping and structures
Grade Options304 for neutral, low-chloride duty; 316 or 316L where chlorides, acids or welded product-contact parts call for it; duplex for severe duty
Hot Chloride ServiceNeeds a grade review even in 316, because pitting and stress cracking become risks when the duty is hot, salty and stressed
WeldingContinuous welds, inert-gas shielded inside, ground smooth on product-contact seams
Surface FinishMill finish, ground, polished, bead-blasted or electropolished, set by a roughness value for product-contact surfaces
Post-Weld TreatmentPickling and passivation, rinsed with water low in chloride
Design BasisAtmospheric, jacketed, pressure or vacuum, fixed by design pressure, temperature and the pressure-vessel rules that apply locally
Fittings and ConnectionsTri-clamp, flanged or welded joints, with sanitary valves, chosen by the cleaning method
Frames and SupportsSealed hollow sections or solid sections, with feet that can be washed round
InspectionDimensional check, leak or hydrostatic test, and material certificates traceable to the plate

Typical Process Route

1

Define Media, Temperature and Cleaning

List every fluid the equipment will meet, with its temperature, chloride content and cleaning chemicals. These fix the grade and the finish before any drawing is made.

2

Choose Grade and Finish

Choose between 304, 316 or 316L, or duplex for severe duty, and state the surface finish as a roughness value for product-contact areas. Do not specify only the word stainless.

3

Drawing and Material Selection

Dimensions, nozzles, supports and wall thickness are drawn, and plate and tube are bought with material certificates that trace back to the heat of steel.

4

Cutting, Forming and Rolling

Plate is cut and rolled into shells and dished ends. Stainless is worked with dedicated tools, away from carbon-steel grinding, because iron dust pressed into the surface starts rust.

5

Welding

Seams are welded continuously with inert gas inside the joint to prevent oxide. Intermittent welds on product-contact seams leave gaps where bacteria and residue collect.

6

Grinding and Polishing

Welds on product-contact surfaces are ground flush and polished to the specified roughness, and electropolishing may follow for hygienic duty.

7

Pickling and Passivation

An acid treatment removes heat tint and free iron and restores the passive film, followed by a rinse in water low in chloride. Skipping this step is the usual cause of early rust spots.

8

Testing and Inspection

Dimensions are checked, vessels are leak or hydrostatically tested and critical welds can be dye-penetrant tested. Test water is drained and dried, because standing chloride-bearing water pits steel.

9

Protection, Transport and Installation

Surfaces are wrapped for transport and lifted with non-metallic slings. On site, stainless supports and clean tools keep carbon steel off the surface, and the system is flushed before use.

Process & Equipment Modules

  • Process tanks with dished ends
  • Jacketed or insulated vessels
  • Agitated mixing vessels
  • Pressure and vacuum vessels
  • Hygienic pipework and fittings
  • Valves and manifolds
  • Pumps with stainless wetted parts
  • Hoppers, tables and conveyors
  • Structural frames, platforms and ladders
  • Clean-in-place spray balls and return lines

Plant Output

Fabricated tanks and vessels made to a drawingPiping, fittings and valve manifoldsMaterial certificates and weld inspection recordsPassivated, finished equipment ready to install

Applications

  • Fruit juice, pulp and syrup holding and blending tanks
  • Edible oil storage and process vessels
  • Herbal extract and solvent-contact vessels
  • Milk, beverage and brewery-type process tanks
  • Brine and salt-bearing duty in 316L
  • Hygienic pipework and valve manifolds for liquid food
  • Cleaning-solution and process-water tanks
  • Tables, hoppers, conveyors and platforms for food-contact handling

Key Features

  • Grade Named for the Duty

    304, 316L or duplex is stated for each part of the plant, so quotations can be compared on steel and not only on weight.

  • Continuous Welds, Ground Smooth

    Inert gas protection inside the joint and a smooth finished seam keep product-contact welds free of gaps and heat tint.

  • Finish Stated as a Number

    A roughness value on the specification gives the fabricator and the inspector the same target, and polish is paid for only where the product needs it.

  • Passivation After Welding

    Pickling and passivation restore the protective film after fabrication, and a low-chloride rinse protects it.

  • Crevice-Free Design

    Hollow sections are sealed, gasket seats are clean and piping avoids long dead legs, since crevice geometry can matter more than the chloride level.

  • Drainable Geometry

    Sloped bottoms and low outlets let tanks and lines empty fully, which helps cleaning and keeps standing water off the steel.

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Frequently Asked Questions

What information is needed to size Stainless Steel Process Equipment?
Give what each tank or vessel holds, its working volume and temperature, whether it runs at atmospheric pressure, under pressure or under vacuum, and the chloride content of the product, water and cleaning chemicals. Add the cleaning method, the finish the product needs, the nozzles, agitators and jackets required and how many items are wanted. These set the grade, wall thickness and finishing hours.
What capacity range does Stainless Steel Process Equipment cover?
The indicative capacity range is 0.5–20 m³ working volume. This is a vessel working-volume range, not a throughput, so state the working volume of each tank or vessel you need, or the batches per day. Say how many hours a day the plant will run.
When is 304 enough, and when is 316L needed?
Grade 304 serves neutral, low-chloride duty. Choose 316 where chlorides from salt, brine or cleaning chemicals are present, and 316L for welded product-contact parts to avoid sensitisation. Neither is automatic: hot, salty and stressed service can still pit or crack 316, and tight crevices under gaskets and supports can start attack that grade alone does not prevent.
Which media attack stainless steel?
Chlorides are the main enemy: salt, brine, bleach and hydrochloric acid cleaners all cause pitting, and heat makes it worse. Strong acids at high temperature also attack common grades. A trap is leaving chloride-rich test or rinse water standing in a tank. List every medium, including cleaning chemicals and the water used to test the vessel, before the grade is chosen.
What should a specification state for surface finish?
A roughness value in Ra for product-contact surfaces, and where it applies: inside, outside, welds. A figure such as 0.8 µm Ra is common for dairy-type hygiene, but the right value depends on the product. Electropolishing costs more again and is worth it for sticky products and for vessels that cannot be dismantled for cleaning.
What should a specification say about welds on product-contact seams?
Ask for continuous welds, shielded with inert gas inside the joint and ground smooth, with weld inspection as an acceptance item. Intermittent welds leave gaps where residue accumulates and cleaning cannot reach. Leaving weld finish to the fabricator's usual practice is the common cause of hygiene problems in otherwise good vessels.
What does passivation do, and can it be skipped?
Welding and grinding leave heat tint and traces of iron on the surface. Pickling and passivation remove them and let the chromium oxide film re-form, so the steel resists rust. Skipping it saves little and often leads to rust spots within weeks, which the buyer sees as a material fault. Ask for it in the proposal, with a rinse in low-chloride water.
What drives the price of stainless steel equipment?
Steel weight comes first, so wall thickness and vessel size count. Then grade, hours of grinding and polishing, jackets, agitators and nozzles, and testing and material test certificates. A fabricated skid has added frame and piping cost, which is covered under custom process equipment and skids.
How do I request a proposal for Stainless Steel Process Equipment?
Use the Request a Quote page and describe your project. Ask the proposal to name the grade of stainless steel, the surface finish, the code the equipment is made to, the documents supplied (for example material certificates) and the testing done before delivery.

Enquire about Stainless Steel Process Equipment

Send your raw material, target product and capacity to Kadali Africa Ventures for a technical proposal.

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