Ethan Clarke
Schedule 80 PVC pipe is used for industrial and high-pressure water flow applications. It is designed to handle pressure and corrosive chemicals. It comes in standard 10' or 20' sections, with pipe sizes ranging from 1/2 to 24. When installing Schedule 80 PVC pipe, it is important to use a sturdy primer and cement. The type of glue used depends on the pipe size. While Schedule 80 PVC pipe is commonly used, it is not compatible with all products due to its smaller internal diameter.
| Characteristics | Values |
|---|---|
| Application | Industrial and higher-pressure water flow |
| Temperature Handling | 140 degrees F |
| Length | 10' or 20' |
| End Type | Plain or belled |
| Pipe Size Range | 1/2" to 24" |
| Installation | Easy |
| Use Cases | Pressure applications, chemical corrosive jobs |
| Installation Adhesive | Primer, cement, PVC glue |
| Standards | Adheres to ASTM D 1785, NSF-approved for potable water |
| Compatibility | FORMUFIT external-fit products |
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What You'll Learn
Using a sturdy primer and cement
When working with Schedule 80 PVC pipes, it is important to use a heavy-duty primer and cement due to the increased wall thickness of the pipes.
Firstly, you need to determine the material of the pipe you will be working with, in this case, PVC. Using the correct cement for the pipe material is crucial, as incompatible cement and pipe materials will not chemically fuse together, leading to joint failure.
For Schedule 80 PVC pipes, a heavy body cement is required. Heavy-duty cements are suitable for all larger schedules and classes of PVC pipe fittings up to 12 inches and up to 18 inches for non-pressure applications. The heavy-duty cement can be used for potable water, pressure pipe, conduit, and DWV applications.
Regarding primers, for Schedule 80 fittings, an industrial or heavy-grade primer is necessary. The primer softens the PVC in preparation for solvent welding. It is important to note that some manufacturers offer one-step cements that do not require the use of a primer. However, if you are using a primer and cement system, it is crucial to follow the manufacturer's instructions for their specific products.
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Installation without coupling
To install Schedule 80 PVC fittings without coupling, it is important to follow proper installation guidelines to ensure a leak-free service and avoid issues with stress cracking. Here is a step-by-step guide:
Preparation
Before beginning the installation, ensure you have the correct materials. Schedule 80 threaded pipe fittings require the use of Schedule 80 pipe nipples, which have a thicker wall section for added strength. It is important to note that Schedule 40 PVC pipe nipples do not exist, so only use Schedule 80 for threaded fittings.
Assembly
- Finger-Tighten: Begin by finger-tightening the Schedule 80 PVC fittings onto the pipe. This is the initial step to ensure a secure connection.
- Add One to Two Turns: After finger-tightening, use a wrench or a suitable tool to add one to two turns. This will provide enough tension to ensure the fitting is within the tensile strength of PVC. Be careful not to over-tighten, as this can lead to stress cracking, especially on smaller diameter fittings.
- Sealant: When working with threaded plastic fittings, it is recommended to use a sealant specifically designed for plastic. Avoid using PTFE tape, as it is intended for metal pipes and can add strain to the PVC threads. Pipe dope or PTFE paste is suitable for metal and plastic connections.
- Check Compatibility: If using a sealing compound, ensure it is compatible with plastics. Some compounds contain oils that can damage plastic. The sealing compound should not lubricate the joint excessively, as this may encourage over-tightening.
Transitioning to Other Pipe Materials
If you need to transition from Schedule 80 PVC to other pipe materials such as PEX, copper, or CPVC, you can use a PVC transition coupling. These couplings have colour-coordinated collars to identify compatibility: the white collar end is for Schedule 80 PVC, while the tan collar end is for the other pipe types. No special tools, glues, or soldering is required for this type of coupling.
By following these steps and adhering to the recommended practices, you can successfully install Schedule 80 PVC fittings without coupling and create a reliable, leak-free connection.
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Measuring outside diameter
Measuring the outside diameter of a pipe is a simple process, but it requires some basic equipment and a little bit of maths. The first step is to identify the type of pipe you are dealing with. There are three types of pipes: male, female, and no-thread. Male pipes have grooves on the outside, female pipes have grooves on the inside, and no-thread pipes have neither. It is important to identify the type of pipe because the way you measure the outside diameter depends on the type of pipe.
For male and no-thread pipes, you can measure the outside diameter directly by using a flexible tape measure to measure the circumference of the pipe. Wrap the tape measure around the pipe and record the measurement. If you don't have a flexible tape measure, you can use a piece of string instead. Mark the point on the string where it meets the start, then measure the length of the string with a straight ruler. Once you have the circumference, you need to divide it by pi (3.1415) to get the outside diameter.
Alternatively, you can use a caliper to directly measure the distance between the outside edges of the pipe opening. This method requires a little less math but may be more expensive, as a digital caliper is the most accurate way to measure a pipe. If you don't have a caliper, a simple tape measure or ruler can also be used, but the measurement may not be as precise.
For female pipes, you need to measure the inside diameter instead of the outside diameter. You can use a caliper or a ruler for this, measuring the distance between the inside edges of the pipe. This measurement does not include the thickness of the pipe walls. It's important to note that not all pipes are created equal, and the size of the pipe will vary depending on the material it is made from.
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Using the right glue
When gluing Schedule 80 PVC pipe, it is important to use the correct type of glue to ensure a strong and durable bond. The type of glue you will need will depend on the size of your pipe and the specific application.
For smaller Schedule 80 pipes, a medium-body solvent cement can be used. This type of cement is suitable for pipes with diameters up to 4 inches. If you are working with larger pipes, you will need to use a heavy-body solvent cement. This type of cement is required for pipes with diameters between 4 and 12 inches. For even larger pipes with diameters greater than 12 inches, you will need to use an extra-heavy-body solvent cement.
In addition to the size of the pipe, the application may also dictate the type of glue you need. For example, if you are using Schedule 80 PVC pipe as electrical conduit, you will need to use a conduit-specific glue. This type of glue is designed to prevent an internal "squish out" that could damage conductors as they are fed through the conduit.
It is also important to follow the manufacturer's instructions when using any type of glue. For example, most glues should be applied to both surfaces being bonded. However, with conduit glue, you will only apply glue to the male connection. It is also important to allow the glue to cure completely before use. For most glues, this means allowing 2 hours of cure time at temperatures above 60°F.
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Applications of Sch 80 PVC pipe
Schedule 80 PVC pipes, also known as Sch 80 PVC, are widely used in various applications due to their superior strength, durability, and resistance to corrosion. One of their key features is their thicker walls, which make them suitable for high-pressure applications. Here are some common applications of Sch 80 PVC pipes:
Plumbing
Sch 80 PVC pipes are commonly used in plumbing systems, both in residential and commercial settings. They are known for their high-pressure rating and ability to handle fluctuating pressures and temperatures. These pipes are ideal for creating secure and leak-free connections between water supply lines and for making extensions in piping systems. Their durability ensures the integrity of the plumbing network over an extended period.
Industrial Processes
In industrial settings, Sch 80 PVC pipes are used for various applications, including industrial plumbing and high-pressure water lines. They are suitable for irrigation systems, fire suppression systems, and any application that requires increased durability and resistance to high-pressure conditions. The corrosion resistance of Sch 80 PVC is particularly advantageous in industrial processes involving exposure to moisture or chemicals.
Chemical Processing Systems
Due to their superior chemical resistance, Sch 80 PVC pipes are often the material of choice in facilities handling corrosive substances. Their ability to withstand exposure to a wide range of chemicals makes them a reliable choice for chemical processing systems.
Aquaculture and Agriculture
Sch 80 PVC pipes are also used in aquaculture and agriculture systems. They provide strength and dependability for water circulation and nutrient delivery systems. Their durability ensures that these systems can operate effectively and reliably over long periods.
The versatility, strength, and corrosion resistance of Sch 80 PVC pipes make them a trusted choice across a range of demanding applications, contributing to their popularity in the plumbing, industrial, and agricultural sectors.
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Frequently asked questions
Schedule 80 PVC pipe is used for industrial and higher-pressure water flow applications. It can handle temperatures of up to 140 degrees Fahrenheit and is designed for pressure applications and chemical corrosive jobs.
Schedule 80 PVC pipe comes in standard 10- or 20-foot sections, with pipe sizes ranging from 1/2 inch to 24 inches.
For Schedule 80 PVC pipe, it is recommended to use a sturdy primer and cement. A standard medium set PVC glue is suitable for sizes up to 12 inches. For larger sizes, a slow-set glue is recommended to ensure proper and secure connections.
FORMUFIT external-fit products are compatible with Schedule 80 PVC. However, their internal-fit products, such as dome caps and adjustable elbows, are not compatible due to the smaller internal diameter of Schedule 80 PVC. While FORMUFIT products are designed for structural use, they are not ideal for plumbing applications.
