Whether you’re a sewing enthusiast, a medical professional, or someone with body modifications, you may find yourself wondering about “how close nipple”—either in terms of piercings, post-surgery care, or anatomy. Understanding the proper way to approach this sensitive topic matters for both health and aesthetics.
In this article, we’ll clarify what “how close nipple” means, guide you through the key steps, and share practical tips to ensure optimal results and safety.
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What Is a Close Nipple? A Comprehensive Guide for Plumbing and Piping
When working with plumbing or industrial piping systems, you’re likely to hear the term “close nipple.” Understanding what a close nipple is—and how it’s used—is important for anyone involved in piping, construction, or DIY plumbing projects. In this guide, you’ll find everything you need to know about close nipples: what they are, how they’re used, important considerations, and helpful tips for selection and installation.
Understanding the Close Nipple
A close nipple is a short length of pipe that is threaded at both ends. What sets a close nipple apart from other nipples is that its threads run nearly the entire length of the pipe, with virtually no unthreaded area (sometimes called a “shoulder”).
Key Points:
– Fully threaded: Threads cover nearly the entire outside surface, so you can screw fittings right up to each other.
– Minimal exposed pipe: Once installed, there’s almost no bare pipe visible between the connected fittings.
– Material options: Typically available in steel, stainless steel, brass, galvanized steel, and sometimes in plastic.
In plumbing and other piping systems, close nipples provide a simple, secure way to join two female-threaded fittings or pipes tightly together with minimal spacing.
Where and Why Are Close Nipples Used?
Common Applications
Close nipples are an essential part in a variety of piping projects, including:
– Tight connections: When two fittings or parts need to be joined with the least possible gap.
– Repair jobs: To replace or connect fittings in tight spaces where longer pipe sections won’t fit.
– High-pressure systems: To ensure secure, leak-resistant joins in systems where space and strength matter.
– Pipe extensions: Sometimes used to add a short, precise extension in a pipeline.
Benefits of Using Close Nipples
There are several clear reasons to choose a close nipple for your project:
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Space-saving
They’re ideal in spots where every millimeter counts—like inside machines, behind walls, or under sinks. -
Strong connections
Fully threaded design allows for tightly sealed, robust joints that can handle vibration and pressure. -
Clean appearance
With little or no exposed pipe, close nipples help create a neat, professional finish. -
Material variety
Available in several metals and polymers, so they work in different environments (e.g., corrosion-prone or high-temperature systems).
Key Features and Specifications
While all close nipples share basic similarities, you’ll find differences in terms of:
- Diameter (Nominal Pipe Size): Typical sizes range from 1/8 inch to 4 inches and beyond, depending on your system.
- Length: “Close” describes the minimal length—just enough pipe for full threading and tightening.
- Thread Type: Most commonly National Pipe Thread (NPT), but also available in BSP or other regional standards.
- Material: Common metals include black steel, galvanized steel, stainless steel, and brass; some plastic options are also available.
- Pressure Rating: Matches the schedule (thickness) of the pipe, such as Schedule 40 or 80, determining the maximum safe pressure.
How to Install a Close Nipple
Proper installation is crucial for a secure and leak-free connection. Here’s a simple step-by-step guide:
- Choose the Correct Size and Material
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Confirm that the diameter, length, and material of the nipple match your system’s requirements.
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Prepare Your Threads
- Clean all threads (nipple and fittings) to ensure a proper seal.
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Apply thread sealant tape (PTFE/Teflon tape) or pipe joint compound for added leak protection.
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Hand Tighten First
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Screw the close nipple into one fitting by hand to avoid cross-threading.
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Tighten with the Proper Tool
- Use pipe wrenches to carefully tighten; for close nipples, this can be tricky as there is little or no “shoulder” to grip.
- If the nipple has a small unthreaded spot in the middle, use that for your wrench.
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For fully threaded close nipples, a special pipe nipple wrench or internal pipe wrench may be required.
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Secure Both Ends
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Attach and tighten the second fitting. While doing so, ensure a snug fit but avoid over-tightening which can damage threads or crack fittings.
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Test for Leaks
- Once installed, pressurize the system and check the connection points for any leaks.
Important Aspects and Challenges
While close nipples are very useful, they present a few unique challenges:
Tightening and Removal
- No “Shoulder”: The absence of a shoulder makes gripping the middle area with a wrench difficult. This sometimes requires special tooling and care.
- Over-tightening Risks: Because fittings can butt up tightly, you need to be cautious not to overtighten and damage threads.
Access Issues
- Limited Handling Space: In tight spaces, it can be tough to get tools onto the nipple, making both installation and removal tricky.
Material Compatibility
- Corrosion: Choosing the right material is crucial. For water pipes, galvanized or stainless steel is common; for gas, black steel is usually used.
Best Practices and Practical Tips
Follow these tips for a professional, trouble-free installation:
Before Installation
- Check Thread Quality: Damaged threads can lead to leaks or cross-threading. Inspect nipples before use.
- Choose the Right Material: Match to your system’s fluid, pressure, and temperature requirements. For corrosive or outdoor use, stainless steel or brass may be best.
During Installation
- Always Use a Thread Sealant: PTFE tape or approved pipe dope prevents leaks.
- Don’t Mix Metals Unnecessarily: For example, joining stainless steel to galvanized steel can cause galvanic corrosion; use dielectric unions when needed.
Handling Tight Spaces
- Use Internal Pipe Wrenches: These specialty tools fit inside the pipe—ideal for gripping close nipples without damaging threads.
- Plan Connections: In very tight spots, consider assembling parts before installing them in confined locations.
General Care
- Avoid Reusing Damaged Nipples: Crushed, corroded, or stripped nipples should be replaced, not reused.
- Store Properly: Keep new nipples clean and dry to prevent rust and contamination before installation.
Understanding Costs and Shipping Tips
When buying close nipples, the price depends on material, size, and quantity. Here’s what to consider:
Cost Factors
- Material: Stainless steel and brass are more costly than black or galvanized steel. Plastic versions are typically cheapest.
- Size: Larger diameters or custom lengths are more expensive.
- Quantity: Bulk packs are often cost-effective, especially for contractors or frequent repairs.
- Specialty Types: NPT, BSP, or custom-specified threads may impact price.
Shipping Advice
- Order in Bulk if Possible: Shipping per-piece is usually more costly than ordering a pack, especially when purchasing standard sizes.
- Compare Vendors’ Shipping Policies: Some suppliers offer free or discounted shipping over a particular order value.
- Weight Considerations: Metal nipples, especially in high volume, can add up in shipping weight—factor this into your budget.
- Delays for Custom Orders: Special materials or unusual sizes may require longer lead times.
Common Alternatives: Shoulder Nipples and Standard Pipe Nipples
Sometimes, a close nipple may not be the best option for your job.
- Shoulder Nipples: Have a small unthreaded section (shoulder) in the center, making it easier to tighten with a wrench. Slightly longer length than close nipples.
- Standard Pipe Nipples: Have threaded ends and a longer unthreaded center section; chosen where some visible gap is needed between fittings.
Knowing the differences helps ensure you select the right part for your specific task.
Summary
A close nipple is a fully threaded, short pipe fitting ideal for making very tight joints between female-threaded fittings or pipes. The choice of material, diameter, and threading is critical to performance and safety. Installing a close nipple may require additional care and the right tools, especially since almost no unthreaded area is available for gripping.
Choosing the right close nipple, handling it carefully, and using appropriate sealants ensures long-lasting, leak-free connections. By understanding the unique features and challenges of close nipples, you’ll be better prepared for any piping or plumbing project.
Frequently Asked Questions (FAQs)
What is the purpose of a close nipple in plumbing?
A close nipple is used to tightly connect two female-threaded fittings with little or no gap between them. This is ideal for limited space situations or when a discrete, strong connection is required.
Can I use a wrench on a close nipple during installation?
Most close nipples are fully threaded and have no central unthreaded section for a wrench. You’ll need a special internal pipe wrench or a nipple wrench designed for this purpose to install or remove them without damaging the threads.
Are close nipples available in plastic as well as metal?
Yes, close nipples can be found in various materials. Metals like black steel, galvanized steel, brass, and stainless steel are common. Some suppliers offer plastic alternatives for light-duty or chemical applications.
Can I reuse a close nipple after removal?
It’s generally not recommended to reuse a close nipple if it has damaged threads, corrosion, deformation, or other signs of wear, as this can lead to leaks or failures when reinstalled.
How do I choose the right close nipple for my project?
Consider the following: match the diameter and thread type to your fittings, select a material suited for your fluid and environment, and ensure the pressure and temperature ratings are compatible with your system. When in doubt, consult with a plumbing professional or a reputable supplier.
With the right knowledge, tools, and care, using close nipples in your piping projects can be straightforward and reliable. Always plan ahead and choose quality components to ensure the best results.