Seamless unions join two steel pipes with a joint that opens for maintenance.
Fit them beside pumps, traps and valves. As a result, parts come out without cutting pipe.
What are seamless unions?
Seamless steel pipe is made without a welded seam, so it handles high pressure and temperature evenly. Seamless threaded fittings, such as schedule 40 sockets and unions, join small steel lines with screwed joints.
Threaded joints are quick to assemble and easy to take apart. Therefore, they suit small-bore steam, air, fuel and process lines, while larger lines are welded or flanged.
Further reading
- Carbon steel explained (Wikipedia)
- Nominal pipe size and schedules (Wikipedia)
- Types of piping and plumbing fittings (Wikipedia)
Key terms explained
- Nominal pipe size (NPS)
- The trade size of a pipe, such as 1 inch. Each NPS has a fixed outside diameter.
- Schedule
- A number that sets wall thickness for a pipe size. Schedule 40 is the common standard wall.
- Carbon steel
- Steel whose main alloying element is carbon. It is strong and weldable but needs protection from rust.
- Butt weld
- A weld that joins two pipe or fitting ends edge to edge.
Features and benefits
- No weld seam in the pipe or fitting body.
- Threaded joints for quick assembly.
- Schedule 40 wall for strength.
- Suits steam, air and fuel lines.
Technical specifications
| Product | Seamless unions |
|---|---|
| Material | Seamless steel |
| Type | Three-part union |
| Sizes | State size and schedule when you request a quote |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
Sizes, grades and ratings depend on stock and model. Tell us what you need, and we will confirm before you order.
Applications of seamless unions
- Steam lines. Joins steam mains and branches.
- Boiler rooms. Connects feed, blowdown and header pipework.
- Oil and fuel lines. Joins diesel and fuel oil lines.
- Compressed air mains. Builds plant air distribution.
- Fire mains. Joins steel fire water pipework where specified.
- Process plants. Joins process water and utility lines.
- Pump stations. Connects steel pump pipework.
- Cooling water. Joins chilled and cooling water lines.
- Structural frames. Joins pipe in rails and frames.
- Repairs. Replaces worn fittings.
How to choose and install
- Match size and schedule to the pipe.
- Seal threads with a sealant suited to the fluid and temperature.
- Use unions where equipment must be removed.
- Protect carbon steel from rust.
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: Steel & Stainless Steel Pipes & Fittings · Flanges · Valves · Boiler Accessories.
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
Where are seamless unions used?
Beside pumps, steam traps, valves and meters.
What details do you need to quote seamless steel fittings?
Tell us the size, the material grade, the schedule or pressure class and the quantity. A photo of the old part, a nameplate or a drawing also helps. Then call or WhatsApp 0726 086 895, or use the quote form on this page.
Do you deliver seamless steel fittings outside Nairobi?
Yes. We supply customers across Kenya, and we also serve buyers in Uganda and Tanzania. Delivery or courier arrangements are agreed when you confirm the order.
How much does a seamless steel fitting cost in Kenya?
The price depends on the size, the grade, the schedule and the quantity. Therefore, send your list with a quote request and we will reply with current figures.
Do you supply mill test certificates for seamless steel fittings?
Ask us when you request a quote. We will tell you what documentation is available for the stock you order.
Can seamless steel fittings carry steam?
Steel suits steam when the grade, schedule and rating match the steam pressure and temperature. Confirm your conditions with us.
Which thread sealant suits steam?
Use a high-temperature thread sealant or tape rated for steam.
Can threaded fittings take high pressure?
Within their rating. For very high pressure, use socket weld or butt weld fittings.
Is seamless pipe threaded?
It can be supplied plain or threaded. Tell us which you need.
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