Joining BlazeMaster® CPVC Pipe with One-Step Cement


Click Here   to also read the GF Harvel BlazeMaster® "Installation Instructions".
Alternatively ensure that you read the "Installation Instructions" provided by the manufacturer of the BlazeMaster product you are using.

Cutting Pipe

BlazeMaster® CPVC pipe can be easily cut with a ratchet cutter, wheel-type plastic tubing cutter, a power saw, or a fine toothed saw. To ensure the pipe is cut square, a miter box must be used when using a saw. Cutting the pipe as squarely as possible provides the surface of the pipe with a maximum bonding area. If any indication of damage or cracking is evident at the pipe end, cut off at least 50 mm beyond any visible crack.

Deburring Pipe Ends

Burrs and filings can prevent proper contact between pipe and fitting during assembly, and must be removed from the outside and the inside of the pipe. A chamfering tool or file are suitable for this purpose. A slight bevel must be placed at the end of the pipe to ease entry of the pipe into the socket and minimize the chances of wiping solvent cement from the fitting.

Fitting Preparation

Using a clean dry rag, wipe loose dirt and moisture from the fitting socket and pipe end. Moisture can slow the cure time and at this stage of assembly, excessive water can reduce joint strength. Check the dry fit of the pipe and fitting. The pipe should enter the fitting socket easily 1/4 to 3/4 of the way. At this stage, the pipe should not bottom out in the socket.

Solvent Cement Application

A One-Step Cement is supplied for use with CPVC Pipe and Fittings, use only this cement with BlazeMaster® CPVC products. The set and cure times in the tables below and in the BlazeMaster Installation & Specification Manual are for this cement.

Cement should be purchased when purchasing the pipe and fittings, and be applied using an applicator about half the size of the pipe diameter. Apply a heavy, even coat of cement to the outside pipe end, then apply a medium coat to the fitting socket. Pipe sizes 32 mm and above must always receive a second cement application on the pipe end - apply cement on the pipe end, then in the fitting socket, then again on the pipe end.

Special care shall be exercised when assembling BlazeMaster® CPVC systems in extremely low temperatures (below 4C), or extremely high temperatures (above 38C). Extra set time shall be allowed in colder temperatures. When cementing pipe and fittings in extremely cold temperatures, make certain that the cement has not "gelled". Gelled cement must be discarded. In extremely hot temperatures, make sure both surfaces to be joined are still wet with cement when putting them together.

Assembly

Immediately insert the pipe into the fitting socket and at the same time rotate the pipe a quarter turn. Properly align the fitting for the installation at this time, do not try to re-align fittings after this. Pipe must bottom all the way to the stop in the fitting. Hold assembly for 10 to 15 seconds to ensure initial bonding. A continuous bead of cement should be evident around the pipe and fitting juncture. If this bead is not continuous around the socket shoulder, it may indicate that insufficient cement was applied. If insufficient cement is applied, discard the fitting and begin again. Cement in excess of the bead can be wiped off with a rag.

Care should be exercised when installing sprinkler heads. Sprinkler head adapters should be allowed to cure for a minimum of 30 minutes prior to installing the sprinkler heads. When installing sprinkler heads be sure to anchor or hold the sprinkler head adapter fitting securely to avoid rotating the pipe in a previously cemented connection. Nearby previously cemented fittings must also be permitted to cure for a minimum of 30 minutes.

Safety And Health Precaution

Prior to using CPVC solvent cements, review and follow all precautions found on the container labels, material safety data sheets, and local standard practices for safe handling.

Set and Cure Time

Solvent cement set and cure times vary with pipe size, temperature, relative humidity, and tightness of fit. Drying time is faster for drier environments, smaller pipe sizes, higher temperatures, and tighter fits. Depending on the pipe size and temperature, the assembly must be allowed to set, without any stress on the joints for 1 to 5 minutes. Following the initial set period, the assembly should be handled carefully to avoid significantly stressing the joints.
Note:-    Refer to the cure time tables below, and in the Design & Installation Manual, for minimum cure times prior to pressure testing.

Pressure Testing

Once an installation is completed and cured, per the appropriate table, the system should be tested at 1380 kPa for 2 hours, or at 345 kPa in excess of the maximum pressure, when the maximum pressure to be maintained in the system is in excess of 1035 kPa. This is in accordance with requirements established by NFPA 13.

When pressure testing, the sprinkler system shall be slowly filled with water and air bled from the highest and farthest sprinkler head before test pressure is applied.

Air must always be removed from sprinkler systems, plastic or metal, to prevent it being locked in the system when pressure is applied. Entrapped air can generate excessive surge pressures that are potentially damaging regardless of the piping material.

If a leak is found, the fitting must be cut out and discarded. A new section can be installed using couplings or a union. Unions should only be used in accessible areas.

Sprinkler systems in one and two family dwellings and mobile homes may be tested at line pressure in accordance with the requirements established by NFPA 13D.

Compressed air or other compressed gases must never be used for pressure testing CPVC fire sprinkler systems.

Installing Sprinkler Heads

Warning - To prevent water ways becoming blocked with excess cement, sprinkler heads shall be installed only after all the CPVC pipe and fittings, including the sprinkler head adapters, are solvent welded to the piping and allowed to cure for a minimum of 30 minutes. Sprinkler head adapters should be visually inspected and probed with a wooden dowel to insure that the water way and threads are clear of any excess cement. Once the installation is complete and cured, per the appropriate table, the system shall be hydrostatically tested. It is an unacceptable practice to thread the sprinkler head into the adapter fitting prior to cementing the adapter to the droppers.

Install the sprinkler into the sprinkler head adaptor only after the recommended cure time. Do not pre-assemble the drop assembly with the sprinkler head prior to cementing all joints.

Droppers & Sprinkler Heads

Correct Incorrect



Top of page

Solvent Cement Cure Times

Tables 1,2 and 3 provide information about cement cure times at various pressures and ambient temperatures. These tables allow for pressures of 1550 kPa, 1380 kPa and 690 kPa, and temperatures between -18C and 49C. It is important to use the recommended cure times to avoid damage to pipe joints.



Table 1 - Cure Schedules for 1550 Kpa Pressure

1550 kPa (225 psi) Test Pressure (maximum)
Ambient Temperature During Cure Period
(Use this table for all cut-ins)

Pipe Size
16C to 49C
(60F to 120F)
4C to 15C
(40F to 59F)
-18C to 4C
(0F to 39F)
20 mm (3/4")
1 hr.
4 hrs.
48 hrs.
25 mm (1")
1 hrs.
4 hrs.
48 hrs.
32 & 40 mm (1" & 1")
3 hrs.
32 hrs.
10 days
50 mm (2")
8 hrs.
48 hrs.
Note 1
65 & 75 mm (2" & 3")
24 hrs.
96 hrs.
Note 1

Note 1:
For these sizes, the solvent cement can be applied at temperatures below 40F (4.5C), however, the sprinkler system temperature must be raised to a temperature of 40F (4.5C) or above and allowed to cure per the above recommendations prior to pressure testing.


Table 2 - Cure Schedules for 1380 kPa Pressure

1380 kPa (200 psi) Test Pressure (maximum)
Ambient Temperature During Cure Period

Pipe Size
16C to 49C
(60F to 120F)
4C to 15C
(40F to 59F)
-18C to 4C
(0FC to 39F)
20 mm (3/4")
45 min.
1 hrs.
24 hrs.
25 mm (1")
45 mins.
1 hrs.
24 hrs.
32 & 40 mm (1" & 1")
1 hrs.
16 hrs.
120 hrs.
50 mm (2")
6 hrs.
36 hrs.
Note 1
65 & 75 mm (2" & 3")
8 hrs.
72 hrs.
Note 1

Note 1:
Solvent cement can be applied at temperatures below 4.5C (40F) for all sizes. However, for 50mm size and larger, the sprinkler system temperature must be raised to a temperature of 4.5C (40F) or above and allowed to cure for the recommended time before the system is filled with water and pressureised.


Table 3 - Cure Schedules for 690 kPa Pressure

690 kPa (100 psi) Test Pressure (maximum)
Ambient Temperature During Cure Period

Pipe Size
16C to 49C
(60F to 120F)
4C to 15C
(40F to 59F)
-18C to 4C
(0FC to 39F)
20 mm (3/4")
15 min.
15 mins.
30 mins.
25 mm (1")
15 mins.
30 mins.
30.mins.
32 mm (1")
15 mins.
30 mins.
2 hrs.

Notice:
40 mm, 50 mm, 65 mm & 75 mm pipe sizes must ONLY be tested in accordance with Table 1 and Table 2.




One-Step Solvent Cement Requirements

Table 4,  provides information to estimate the number of cement joints that can be made with a quart can of cement for the various pipe sizes.



Table 4 - Solvent Cement Requirements

Estimating One Step Solvent Cement Requirements
for
CPVC Fire Sprinkler Pipe

Pipe Size
Estimated Number of Joints per Quart of Cement
20 mm (3/4")
270
25 mm (1")
180
32 mm (1")
130
40 mm (1")
100
50 mm (2")
70
32 mm (2")
50
75 mm (3")
40
Top of page