This stainless steel pipe schedule 40 is the 25mm (1 inch nominal) size, a workhorse for process, water and utility lines. Sparks Plumbing Experts supplies it in Kenya, Uganda and Tanzania to fabricators, plumbing contractors, food plants and factories.
Stainless steel resists rust, so the pipe keeps water and products clean and lasts in wet or corrosive places.
What is stainless steel pipe schedule 40?
Pipes are sold by nominal size and schedule. Nominal size is a reference name rather than an exact measurement, and 25mm (DN25) matches 1 inch NPS. Under the ASME B36.19 standard, this size has an outside diameter of 33.4 mm.
The schedule number sets the wall thickness. For 1 inch pipe, schedule 40 means a wall of about 3.38 mm, which gives a good balance of strength and weight. Higher schedules, such as 80, have thicker walls for higher pressures.
Further reading
- Nominal pipe sizes and schedules (Wikipedia)
- Stainless steel grades (Wikipedia)
- Pipes for fluid systems (Wikipedia)
Key terms explained
- Nominal size (DN/NPS)
- A standard size name; 25mm DN equals 1 inch NPS.
- Schedule
- A number that sets wall thickness for each pipe size.
- Grade 304
- General-purpose stainless steel for most water and food uses.
- Grade 316
- Stainless steel with molybdenum for better resistance to chlorides and many chemicals.
- Seamless vs welded
- Seamless pipe has no weld seam; welded pipe is formed and welded along its length.
Features and benefits
- Corrosion-resistant stainless steel
- Schedule 40 wall for general pressure service
- Smooth bore for clean, efficient flow
- Suits threading, welding or flanged joints
- Hygienic for food and water uses
- Long service life with little maintenance
Technical specifications
| Product | Stainless steel pipe, schedule 40 |
|---|---|
| Nominal size | 25mm (DN25) / 1 inch NPS |
| Outside diameter | 33.4 mm (ASME B36.19) |
| Wall thickness | About 3.38 mm (schedule 40) |
| Grade | 304 or 316 (confirm with quote) |
| Construction | Seamless or welded (confirm with quote) |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
Grade, construction and standard lengths depend on current stock. Ask us for the mill certificate where your project requires one.
Applications of stainless steel pipe schedule 40
- Water supply lines. Carrying clean water without rust.
- Food processing. Moving water and products in hygienic plants.
- Dairy plants. Carrying cleaning solutions and process water.
- Breweries and beverages. Utility and process lines that must stay clean.
- Chemical lines. Carrying chemicals compatible with the chosen grade.
- Pharmaceutical utilities. Water and utility services in clean areas.
- Compressed air. Corrosion-free air distribution lines.
- Steam condensate. Returning condensate within the pipe's rating.
- Boiler feed lines. Small-bore feed and utility piping.
- Handrails and frames. Structural uses where a clean finish matters.
- Coastal installations. Resisting salty air, especially in grade 316.
- Water treatment. Dosing and process lines in treatment plants.
- Laboratories. Utility lines in labs and institutions.
- Hotel kitchens. Hygienic water and gas-adjacent utility runs, where rated.
- Fabrication. Stock for workshops building skids and frames.
How to choose and install
- Choose grade 316 for salty water, coastal air or many chemicals; 304 suits most water uses.
- Confirm the pressure and temperature against schedule 40 ratings.
- Use stainless fittings and flanges to avoid galvanic corrosion.
- Use clean tools reserved for stainless to avoid rust contamination.
- Purge with inert gas when welding to protect the inside of the weld.
- Ask for mill certificates if your client requires traceability.
Why choose Sparks Plumbing Experts
- Valves, flanges and gaskets togetherComplete a pipeline joint with matching valves, flanges, gaskets and bolts.
- Pressure-rated optionsMany items come in PN16, class 150 or class 300 ratings, so you can match the line.
- Stainless and carbon steelChoose stainless for corrosion resistance or carbon steel where it suits the service.
- Plant maintenance sparesKeep critical spares on hand for planned shutdowns and breakdowns.
- Visit or collect in NairobiOur store is at KCB Building, Enterprise Road, in the Industrial Area, so you can see parts before you buy or collect your order.
- Quotes your wayAsk for prices by phone, WhatsApp, email or the online quote form, whichever suits you on site.
- Over 1,600 products in one placeOur catalogue covers 55 categories, so one supplier can handle most of your parts list.
- Help choosing the right partSend a nameplate photo, a drawing or the old part, and we help you match size and specification.
- Single items or project quantitiesWe price a single replacement part just as readily as a full site order.
- Supply across East AfricaWe serve customers across Kenya, and we also supply buyers in Uganda and Tanzania.
Related products and accessories
Browse more: Stainless Steel · Flanges · Valves · Industrial Piping Systems · Food grade.
Ordering from Sparks Plumbing Experts
We supply customers across Kenya, and we also serve buyers in Uganda and Tanzania. You can collect from our store at KCB Building, Enterprise Road, Nairobi, or ask us about delivery to your site. Send your quantities and specifications, and we will reply with prices and availability.
Request a Quote WhatsApp 0726 086 895
Frequently asked questions
What is schedule 40 stainless steel pipe?
It is stainless pipe with a standard schedule 40 wall thickness, used for general pressure service.
What are the dimensions of 25mm schedule 40 pipe?
The 25mm (1 inch) size has a 33.4 mm outside diameter and a wall of about 3.38 mm under ASME B36.19.
Is 25mm the inside diameter?
No. 25mm is the nominal size. The real inside diameter is about 26.6 mm for schedule 40.
What is the difference between 304 and 316?
Grade 316 contains molybdenum, which improves resistance to chlorides and many chemicals. Grade 304 suits most water and food uses.
What is the difference between schedule 40 and 80?
Schedule 80 has a thicker wall for higher pressure, while schedule 40 is lighter and suits general service.
Can it be threaded?
Yes. Schedule 40 pipe is commonly threaded, welded or fitted with flanges.
Is it food safe?
Stainless steel is widely used in food and beverage plants. Use the grade and finish your process requires.
Seamless or welded: which should I choose?
Seamless pipe suits higher pressure and critical service, while welded pipe is cost-effective for general use.
What lengths do you supply?
Ask us for the standard lengths in stock. We can quote full lengths for your project.
Do you supply fittings?
Yes. We supply stainless fittings, flanges and valves to complete your line.
Do you deliver outside Nairobi?
We supply customers across Kenya, and we also serve buyers in Uganda and Tanzania. Delivery details come with your quote.
How do I get a price?
Send the grade, size, length and quantity through our quote form or on WhatsApp.
People also search for
Stainless steel pipe price in Kenya
Prices depend on grade, size, schedule and length. Send your list for a quote.
Stainless steel pipe sizes
Common outside diameters are 21.3 mm for 1/2 inch, 26.7 mm for 3/4 inch, 33.4 mm for 1 inch, 42.2 mm for 1 1/4 inch, 48.3 mm for 1 1/2 inch and 60.3 mm for 2 inch.
Schedule 40 vs schedule 10
Schedule 10 has a thinner wall for low-pressure and sanitary lines. Schedule 40 is thicker and suits general pressure service and threading.
304 vs 304L
The L grades have lower carbon, which reduces corrosion risk next to welds. Choose 304L or 316L for welded systems.
How to weld stainless steel pipe
TIG welding with an argon back purge inside the pipe gives clean, corrosion-resistant welds.
1 inch schedule 40 pipe weight
It weighs about 2.5 kg per metre.
Can stainless steel rust?
It can stain or corrode in salty, chloride-rich conditions or when contaminated by carbon steel particles. Cleaning and passivation restore protection.
Stainless pipe vs stainless tube
Pipe is sized by nominal size and schedule. Tube, such as sanitary tube, is sized by its exact outside diameter and wall.
Can schedule 40 stainless pipe be threaded?
Yes, schedule 40 has enough wall for standard pipe threads. Thin schedules such as 10 should not be threaded.
1 inch schedule 40 stainless pressure rating
The allowable pressure depends on grade, temperature and joint type. An engineer should calculate it under the relevant piping code.
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