Alexei Volkov
PEX, or cross-linked polyethylene, is a flexible plastic used for plumbing that has gained popularity over the years, replacing traditional copper and galvanized steel water supply lines. It is cost-effective, easy to install, and does not require soldering, making it a popular choice for both professionals and DIY enthusiasts. When it comes to connecting PEX to a plastic tank, such as an expansion tank, there are various methods and considerations to ensure a secure and functional connection. From using specific connectors and tools to allowing for expansion and contraction, this topic will explore the best practices and techniques for achieving a reliable connection between PEX and a plastic tank.
Characteristics and Values Table for Connecting PEX to Plastic Tank
| Characteristics | Values |
|---|---|
| PEX pipe material | Cross-linked polyethylene, a flexible plastic |
| PEX pipe colours | Red (hot water), blue (cold water), white or gray (either hot or cold) |
| PEX pipe diameters | 3/8" to 1" (use 1/2" or 3/4" for main lines) |
| PEX pipe length | 10-foot sections to 500-foot rolls |
| PEX pipe temperature | Work with pipe at temperatures above freezing |
| PEX pipe distance from heaters | Minimum 18 inches from water heaters, 6 inches from single-wall flues on gas heaters |
| PEX pipe distance from hot items | Stay clear of furnace flues, wood-burning stove pipes, and other hot items |
| PEX connection methods | Stab-in, compression, expansion, push-fit, crimp, clamp |
| PEX connection tools | PEX cutters, PEX expander tool, crimping tool, ratchet clamping tool |
| PEX fittings | Use manufacturer-specific fittings, barbed fitting/crimping ring combination |
| PEX shutoff valves | Recommended, can be crimped into hot and cold lines |
| PEX support | "Standoff" hangers with plates screwed to joists, allow for expansion and contraction |
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What You'll Learn
Using stab-in or compression fittings
When connecting PEX to a plastic tank, you can use stab-in or compression fittings. Stab-in fittings are a quick and easy method that doesn't require any special tools. Simply cut the PEX tubing, push it into the openings of the fitting, and press the outer ring onto the fitting to release the pipe. However, stab-in fittings may not be allowed by some building codes, so it's important to check local regulations.
Compression fittings, on the other hand, require some understanding of how to compress the crimp ring to make a firm connection. First, cut the tubing and slip a crimp ring over the smooth end. Then, slot in the barbed end of the fitting into the PEX tube until it is secure. Place the crimp ring so it is 1/8 to 1/4 of an inch from the end of the pipe, covering the barbed end of the fitting. Finally, tighten the fitting by hand and then use a crimping tool to compress the handles together to secure the connection.
When using compression fittings, it is important to select the appropriate size and material. The fitting must be compatible with the PEX tubing to prevent chemical reactions. Brass compression fittings are commonly used, but they must be lead-free if used for potable water systems. Stainless steel and plastic fittings are also suitable options. Additionally, the compression fitting must match the outer diameter of the tubing to ensure a secure and stable connection.
Both stab-in and compression fittings offer advantages for connecting PEX to a plastic tank. Stab-in fittings are simple and tool-free, while compression fittings provide a watertight seal and are suitable for various pipe materials. However, compression fittings require more skill and understanding of the compression process.
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Crimp rings and cinch clamps
Crimp rings are a band of metal, usually copper, that you slip over the fitting and compress with a crimp ring tool. The crimp ring tool has special jaws that clamp around the outer diameter of the ring, and then, by forcing the handles closed, a crimped connection is made. The main drawback of crimp rings is that you need either separate crimping tools for different sizes of fittings or a universal tool with a swappable insert.
Cinch clamps, on the other hand, work like traditional band clamps. You slip the cinch clamp tool over the protruding tab and squeeze to tighten the clamp. The same tool works for all sizes of cinch clamps, which is more convenient than using crimp rings. The stainless steel cinch clamps are also stronger than copper crimp rings and are less likely to leak when the fitted connection freezes with water in the line. However, you cannot use poly tees and elbows with cinch clamps.
Both copper crimp rings and stainless steel cinch clamps can be used with polyalloy (durable plastic) PEX fittings.
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Push-fit fittings
To install push-fit fittings, simply cut the PEX tubing square to ensure leakproof joints, and push the pipe into the openings of the fitting. The counter-forces produced by the mechanism inside the fitting and the pressure inside the plumbing system will lock the pipe in place. It is important to note that push fittings are not suitable for all types of tubing, and cannot be used with PEX-AL-PEX tubing, PVC pipe, or PB (PolyButylene) pipe.
One advantage of using push-fit fittings is that they are manufactured from lead-free, dezincification-resistant (DZR) forged brass, making them suitable for potable water use in the US and Canada. However, it is important to ensure that the fittings are compliant with the Safe Drinking Water Act, as some products do not meet the low-lead criteria and are therefore only suitable for non-potable water applications.
When working with PEX tubing, it is important to keep the pipes away from heat sources as plastic can melt. Codes typically require PEX to be at least 18 inches away from water heaters and 6 inches away from single-wall flues on gas water heaters. Additionally, it is recommended to work with PEX pipe at temperatures above freezing to avoid leaks.
Overall, push-fit fittings offer a convenient, fast, and easy way to connect PEX tubing to a plastic tank, without the need for special tools or adhesives.
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Expansion fittings
PEX (cross-linked polyethylene) is a flexible, cost-effective plumbing pipe that is faster to install than copper. It is also more durable and less likely to burst when compared to copper.
When connecting PEX to a plastic tank, one must consider the expansion and contraction of the PEX supply. PEX expands and contracts more than copper, so it is important to not stretch it tight and to let it droop a little between fasteners. On long runs, it is recommended to install a loop to allow for contraction.
There are several types of expansion fittings available for PEX, including the F2080 fitting system, which is one of the most popular. This system offers the widest bore and allows for maximum flow. Other types of fittings that can be used with PEX include stab-in, compression, crimp rings, cinch clamps, and push-fit fittings.
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$4.67
Copper crimping
PEX (cross-linked polyethylene) piping is a popular choice for plumbing due to its low cost, ease of installation, and flexibility. When connecting PEX to a plastic tank, you can use stab-in or compression fittings, but these can be expensive and may not be practical for larger projects. A more affordable and practical option is to use crimp rings or cinch clamps.
Now, let's focus on the copper crimping aspect of your query. Copper crimping is a method of creating reliable and leak-free connections in plumbing projects. It involves using a copper pipe crimping tool, also known as a press tool, to apply pressure and create a watertight seal between two pieces of copper or other malleable materials. This process is achieved without the need for heat, making it a safer alternative to soldering in certain situations. Here's a step-by-step guide to copper crimping:
- Insert the Press Fitting: Start by inserting the copper pipe into the press fitting. Ensure that the pipe is pushed in properly for a secure seal. Some fittings have depth marks to guide you on how far the pipe should go in.
- Prepare the Crimping Tool: Choose the correct size of crimping jaws for your tool, based on the pipe and fitting dimensions. Follow the manufacturer's instructions to attach the jaws to the tool.
- Crimp the Fitting: Securely attach the crimping jaws, then place the crimping tool over the press fitting. Ensure the tool is perpendicular to the pipe for a uniform crimp. Squeeze the handle to initiate the crimping process. You may need to make multiple crimps for a proper seal.
- Inspect the Crimp: A well-crimped fitting will connect seamlessly to the pipe with no visible gaps. Some crimping tools have indicators showing whether the crimp is complete.
Types of Copper Crimping Tools:
Copper pipe crimping tools come in various types, each suited to different applications and user preferences:
- Manual: Handheld tools that require physical force to crimp. They are portable, affordable, and ideal for small projects or tight spaces.
- Battery-powered: These battery-operated tools reduce user fatigue and increase productivity with automatic operation, making them ideal for larger projects.
- Hydraulic: Hydraulic force is used to crimp fittings onto pipes in heavy-duty applications.
- Adjustable: These tools offer interchangeable jaws or dies to accommodate different pipe and fitting sizes. They can be manual, battery-operated, or hydraulic.
By following these instructions and selecting the appropriate crimping tool, you can effectively use copper crimping to establish secure and leak-free connections in your plumbing projects.
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Frequently asked questions
PEX pipes are short for cross-linked polyethylene, a flexible plastic used for plumbing. PEX pipes are available in 3/8- to 1-inch diameters and can be red, blue, white, or gray.
You will need specific connectors and tools to connect PEX pipes to a plastic tank. Some common tools include a PEX expander tool, PEX cutter, PEX crimping tool, and a ratchet clamping tool.
Here are some tips:
- Keep PEX pipes away from hot items as plastic melts.
- Use bungee cords to control the coils.
- Cut the PEX pipes square for leak-proof joints.
- Use stab-in fittings only where you have access to the joint.
- Use cinch clamps for an easy and inexpensive connection.
To secure a plastic tank with PEX pipes, you can use "standoff" hangers or self-tapping screws. It is important to support the tank while allowing for expansion, contraction, and vibration movement.
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