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Finding Your PVC Pipe Size

Determining what size PVC pipe you are using in your project or that you picked up

from the home center can be a frustrating and challenging process. FORMUFIT products

are available in six (6) PVC sizes that work with FORMUFIT PVC pipe, but also work with

off-the-shelf plumbing grade PVC pipe, available from your home center or hardware

store. You can use PVC pipe machine to produce PVC pipe.

If you have not worked with PVC pipe before, or are not familiar with how PVC pipes

are sized, we highly recommend you review the following three important details about

PVC Pipe sizing:

The Outside Diameter is not the PVC Pipe Size.

PVC Schedule is Important

Some Pipe isn't Compatible

The Outside Diameter of the pipe is not the PVC Pipe Size.

PVC Pipe sizes are so named by the measurement of the inside diameter (also called

the bore) of the PVC pipe, and not the outside diameter. If you measure the outside

diameter it will give you a larger reading than the actual PVC Pipe Size. The pipe will

always be larger on the outside than the size name, as the thickness of the ‘walls’ of

the pipe make it larger.

Correct way to Measure

FORMUFIT products follow the Nominal Pipe Size (NPS) naming convention or PVC

specifications, which identifies the diameter of the hole of a PVC pipe with a closely-

related dimensional number for its size. Therefore the Pipe Size for all of our products

is based on the inside hole or ‘bore’ of the PVC pipe that it fits. This is the

correct way to measure what PVC Pipe Size you need.

Incorrect way to Measure

You should never use the outside diameter of the pipe to determine your PVC pipe

size. If you measure the outside diameter of your PVC pipe and order based off that

measurement you will almost always receive the next PVC Size up. Never order PVC

products based off the outside diameter.

Important: PVC Schedule

PVC Schedule (abbrev. SCH or Sch.) is the thickness of the PVC pipe wall.

The most common Schedule is 40, but Schedule 80 PVC is also available. As the schedule

gets larger the pipe wall gets thicker from the outside in, so the inside hole (bore) of

the pipe gets smaller.

FORMUFIT internal-fit products, such as Internal Dome Caps, Adjustable

Elbows and Internal Couplings are only compatible with Schedule 40 PVC pipe. All

FORMUFIT Furniture Grade PVC pipe is Schedule 40. Our internal-fit products will not

work with PVC Schedule 80, as the inner diameter of 80 Schedule PVC is much smaller than

PVC Schedule 40.

All off-the-shelf pressurized plumbing-grade PVC pipe is marked with the

pipe schedule. Please see our PVC Pipe Markings Page to learn how to read them.

Some Pipe isn't Compatible

Not all types of pipe will work with FORMUFIT fittings and accessories:


The most commonly confused non-compatible pipe is Copper Tube Size (CTS) plastic

pipe, which is actually made from CPVC and uses an entirely different sizing system. If

you use CTS pipe with FORMUFIT fittings or accessories they will be much too large for

the pipe. CTS and CPVC can be identified by their yellowish or tan color, and are marked

in the manufacturer printings as CTS or CPVC.

For more information on CPVC, please see our CPVC Incompatibilities page here.

ABS Pipe

While ABS pipe is size-compatible with most FORMUFIT products, it cannot be cemented

together using standard PVC cement. A special transitional cement must be used, or the

pipe to fitting connection must be screwed together to connect them securely. ABS pipe

is also very brittle and is not recommended for structural use.

Steel Conduit or Pipe

Steel pipe and conduit have the same outside diameters as the corresponding PVC pipe

sizes and are size-compatible, but are not recommended for use with PVC joints &

fittings, as there is no way to connect the steel pipe to the plastic PVC fitting. In

most cases the steel pipe will easily slide out of the fitting, resulting in loose, or

possibly collapsing, structures.

Ground Protection Mats for the Change in Season

Summer is coming to a close across much of the country where heatwaves are giving

way to cooler temps and wetter weather. With the change of seasons, now is a great time

to outfit your crews with the ground protection mat they need to keep working in the soggy conditions fall

has to offer. Using professional ground protection mats helps you avoid unnecessary

repair and replacement costs, complete job after job with happy customers, and enjoy a

profitable bottom line at the end of the day.

Faster Work and Happier Customers

No question, you need to get the job done when planned, but wet environments can

prevent you from starting the work. Using quality ground protection mats can get you in

sooner and keep your schedule on track. Especially when the solution is lightweight,

easy to deploy, dependable, and can support loads up to 120 tons.

You also want happy customers that refer their friends and contacts, not upset

customers who call because of a torn up yard and have negative lasting memory of your


Plastic Pipe Machine

As an important part of chemical building materials, plastic pipes are widely

accepted by users for their superior performance, hygiene, environmental protection, and

low consumption. They mainly include UPVC drainage pipes, UPVC water supply pipes,

aluminum-plastic composite pipes, and polyethylene (PE). These kinds of water supply

pipes. The pipe production line is composed of a control system, an extruder, a machine

head, a shaping cooling system, a tractor, a planetary cutting device and a turning

frame. Each pipe production line has two extruders, one of which mainly uses powerful

conveying bushings and high-efficiency screws, and the other smaller extruder is used to

extrude the marking line. When the plastic pipe machine malfunctions, it will directly cause the plastic

pipe to have rough surface, jitter ring inside, and no vacuum. Therefore, it is

necessary to eliminate the plastic pipe machine fault in time to improve product


HDPE pipe Machine

HDPE (High Density Polyethylene) water supply pipe, the raw material is from

Sinopec. High density polyethylene is non-toxic and odorless milky white particles. It

has excellent temperature resistance and cold resistance, good chemical reliability,

ductility and impact toughness. Well, it is a kind of thermoplastic resin with high

crystallinity and non-polarity. HDPE pipe is a new type of water supply pipe, which can

be made by

HDPE pipe machine
. Its various aspects are better than common traditional drainage

pipes, such as cement pipes, cast iron pipes, seamless steel pipes and so on. With the

development of high-tech standards, HDPE pipes have become a fashion trend in the future

development of the pipeline industry and will completely replace traditional water

supply pipes.

PP Pipe Machine

PP pipe is made of polypropylene as raw material and made by

PP pipe

. It is non-toxic, hygienic, high temperature resistant and recyclable. It

is mainly used in indoor cold and hot water supply systems in buildings, and is also

widely used in heating systems. It has the characteristics of non-corrosion, and can

withstand the pH value in a wide temperature range, ranging from 1 to 14 high-

concentration acid and alkali corrosion. In addition, the PP pipe is wear-resistant,

non-scaling, the inner wall of the pipe and pipe fittings is uniform and smooth, and the

flow resistance is small and does not scale. It also has the characteristics of reducing

vibration and noise, and has excellent sound insulation performance, which can

significantly reduce vibration and noise caused by liquid flow. The P material has

excellent elasticity so that the pipe and pipe section can expand with the frost heaving

liquid without bursting. The PP tube is anti-condensation and has less heat loss. The PP

material is a poor heat conductor, which can reduce condensation and reduce heat loss.

It is easy to install, light in weight, easy to install and operate, weldable, and has a

long service life. The PP pipe system has a service life of 50 years under specified


PPR pipe Machine

PPR is the abbreviation of type three polypropylene, also called random copolymer

polypropylene pipe. It adopts thermal welding method, has special welding and cutting

tools, has high plasticity, and can be made by

PPR pipe

. The price is also very economical. With an external insulation layer, the

insulation performance is better, and the pipe wall is also very smooth, excluding the

joints of the inner and outer wires. It is generally used in embedded walls or deep well

embedded pipes. PPR pipe is moderately priced, stable in performance, heat-resistant,

heat-insulated, corrosion-resistant, smooth inner wall, no scaling, safe and reliable

piping system, impermeable, and the service life can reach 50 years. However, the

construction technology requirements are high, and special tools and professionals are

required for construction to ensure the safety of the system.