The steel pipe union 1/2 inch joins two 1/2 inch threaded pipes with a joint you can open. This size suits small process, steam trap, instrument and hygienic water lines.
A nut draws two machined halves together. Therefore, you can remove pumps, valves and meters without cutting pipe.
What is a steel pipe union 1/2 inch?
A pipe union is a three-part threaded fitting that joins two pipes and can be opened without turning them. It has two threaded ends and a nut that draws them together.
Unions are fitted next to pumps, valves, meters and equipment. As a result, maintenance teams can remove parts quickly.
Further reading
- Stainless steel grades and corrosion resistance (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.
- Grade 304 and 316
- Common stainless steels. Grade 316 contains molybdenum, so it resists chlorides and chemicals better.
- Passive layer
- A thin chromium oxide film that forms on stainless steel and protects it from rust.
Features and benefits
- Opens without turning the pipes.
- Female threaded ends.
- Machined seat for a tight seal.
- Reusable for repeated service.
Technical specifications
| Product | Steel Pipe Union 1/2 Inch |
|---|---|
| Nominal size | 1/2" |
| Material | Steel or stainless steel, confirm with quote |
| Type | Three-part union |
| Ends | Female thread, both halves |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
Material grade, pressure class and end type depend on stock. Tell us the size, end type and service, and we will confirm.
Applications of a steel pipe union 1/2 inch
- Food and beverage lines. Joins hygienic process pipework.
- Dairy plants. Connects milk and CIP lines.
- Water treatment. Joins treated water and dosing lines.
- Chemical lines. Joins corrosive service lines where the grade suits.
- Steam and condensate. Connects steam traps and small steam lines.
- Compressed air. Joins clean air lines.
- Instrument connections. Mounts gauges and sensors.
- Boiler rooms. Connects feed water and blowdown lines.
- Pump connections. Joins pumps to stainless pipework.
- Marine and coastal sites. Resists salt air in grade 316.
How to choose and install
- Match the union to the pipe size and material.
- Fit one on each side of removable equipment.
- Keep sealant off the seat.
- Use stainless unions on stainless lines.
Why choose Sparks Plumbing Experts
- Every common pipe materialGI, PPR, PVC, HDPE, brass and stainless fittings are all stocked, so you can match any existing system.
- Common sizes in stockMost fitting types come in several sizes, from small domestic sizes up to larger mains sizes.
- Pipes, fittings and valves togetherPipes, fittings, valves, clamps and jointing products come in one order.
- Help with thread and size standardsWe help you confirm inch and millimetre sizes before you buy, which avoids return trips.
- 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 · Stainless Steel · Valves · Flanges.
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 fits a steel pipe union 1/2 inch?
1/2 inch male-threaded pipe or nipples.
Does a steel pipe union 1/2 inch need PTFE tape on the nut?
No. Seal only the pipe threads. The union seat seals on its own.
Where is a steel pipe union 1/2 inch used?
This size suits small process, steam trap, instrument and hygienic water lines.
Can I order steel pipe union 1/2 inch fittings in bulk?
Yes. Include the quantity in your quote request.
What details do you need to quote steel pipe unions?
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 steel pipe unions 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 steel pipe union 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 steel pipe unions?
Ask us when you request a quote. We will tell you what documentation is available for the stock you order.
Can steel pipe unions carry steam?
Steel suits steam when the grade, schedule and rating match the steam pressure and temperature. Confirm your conditions with us.
Where should I fit a pipe union?
Next to pumps, valves, meters and anything that may need removal.
Why does a union leak?
A dirty or damaged seat, or the nut is loose. Clean and retighten.
Can unions be reused?
Yes, if the seat is undamaged.
People also search for
union vs coupling
A union opens without turning the pipes. A coupling is a fixed joint.
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Unions suit small threaded lines. Flanges suit larger pipes.
Steel pipe unions price in Kenya
Prices change with size, model and quantity. Request a quote from Sparks Plumbing Experts for current figures.
stainless steel 304 vs 316
316 resists chlorides and chemicals better. 304 suits general water and food use.
schedule 40 vs schedule 80
Schedule 80 has a thicker wall for higher pressure. The outside diameter stays the same.
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Carbon steel is strong and lower in cost but rusts. Stainless resists corrosion and suits hygienic lines.
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Threaded fittings suit small sizes and quick assembly. Butt weld fittings suit high pressure and large sizes.
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