Step A, Step B | A.O. Smith HYB-90N guide

A.O. Smith HYB-90N Recommended Brush* Size For Primer And Cement Applications, Step A, Step B

PRIMER

It is recommended that Tetrahydrofuran (THF) be used to prepare the surfaces of pipe and ﬁttings for solvent welding. Do not use water, rags, gasoline or any other substitutes for cleaning PVC or CPVC surfaces. A chemical cleaner such as MEK may be used.

CEMENT

The cement should be a bodied cement of approximately 500 to 1600 centipoise viscosity containing 10-20% (by weight) virgin PVC material solvated with tetrahydrofuran (THF). Small quantities of dimethyl formamide (DMF) may be included to act as a retarding agent to extend curing time. Select the proper cement; Schedule 40 cement should be used for Schedule 40 pipe. Never use all-purpose cements, commercial glues and adhesives or ABS cement to join PVC or CPVC pipe and ﬁttings.

APPLICATORS

Select a suitable pure bristle type paint brush. Use a proper width brush or roller to apply the primer and cement (see chart below). Speedy application of cement is important due to its fast drying characteristics. IMPORTANT NOTE: A dauber type applicator should only be used on pipe sizes 2 in. and below. For larger diameter pipe, a brush or roller must be used.

RECOMMENDED BRUSH* SIZE FOR PRIMER AND

CEMENT APPLICATIONS

Nominal Pipe (IPS)	Size Brush Width
2	1.5 in. (3.8cm)
3	1.5”-2.5 in. (3.8cm -
	6.4cm)

*USE ONLY NATURAL BRISTLE 3. MAKING THE JOINT.

A.Cutting

Pipe must be squarely cut to allow for the proper interfacing of the pipe end and the ﬁtting socket bottom. This can be accomplished with a miter box saw or wheel type cutter Wheel type cutters are not generally recommended for larger diameters since they tend to ﬂare the corner of the pipe end. If this type of cutter is used, the ﬂare on the end must be completely removed.

NOTE: Power saws should be speciﬁcally designed to cut plastic pipe.

STEP A

B.Deburring

Use a knife, plastic pipe deburring tool, or ﬁle to remove burrs from the end of small diameter pipe. Be sure to remove all burrs from around the inside as well as the outside of the pipe. A slight chamfer (bevel) of about 10°-15° should be added to the end to permit easier insertion of the pipe into the end of the ﬁtting. Failure to chamfer the edge of the pipe may remove cement from the ﬁtting socket, causing the joint to leak.

STEP B

C.Test dry ﬁt of the joint

Tapered fitting sockets are designed so that an interfaced ﬁt should occur when the pipe is inserted about 1/3 to 2/3 of the way into the socket. Occasionally, when pipe ﬁtting dimensions are at the tolerance extremes, it will be possible to fully insert dry pipe to the bottom of the ﬁtting socket. When this happens, a sufﬁcient quantity of cement must be applied to the joint to ﬁll the gap between the pipe and ﬁtting. The gap must be ﬁlled to obtain a strong, leak-free joint.