Comfit Test Data

REPORT FOR BURST PRESSURE TEST ON COMFIT COUPLER

Purpose

To determine the burst pressure of an assembled duct and Comfit Coupler.

Specimens

Duct 1, 1 1/4, 1 1/2 and 2 inch nominal size to match the duct.

Test Method and Conditions

The test was carried out on an assembly of two pieces of ducts approximately 12 in long joined together by the coupler. The pressure was applied to the assembly as shown in the chart below. After the burst pressure is reached the machine is stopped and sample removed for inspection. The failure is defined as leak in the coupler or coupler duct joint during the testing.

Testing Machine: SATEC System model 3100 (Max. Press 3000 psi)

Temperature: 75 F

Note:

At the maximum burst pressure no leak was observed for any coupler. The couplers were disassembled to check for any component failure. No failure was observed in any coupler component. The couplers are rated for the above burst pressure.

REPORT FOR SUSTAINED PRESSURE TEST ON COMFIT COUPLER

Purpose

To determine the sustained pressure of an assembled duct and Comfit Coupler.

Specimens

Duct - 1, 1 1/4, 1 1/2 and 2 inch SDR11

Coupler - 1, 1 1/4, 1 1/2 and 2 inch nominal size to match the duct

Test Method and Conditions

The test was carried out on an assembly of two pieces of ducts approximately 12 in long joined together by the coupler. The pressure was applied to the assembly as shown in the chart below. After the sustained pressure is reached and maintained for three hours without any leakage, the test is stopped and sample removed for inspection. The coupler is inspected for any defect or damge. For coupler to pass the test there should be no leakage during the entire test period and no damge to any of the coupler component.

Pressure Source: Blackhawk Jack Protopower (Max. Press 10,000 psi)

Temperature: 75 F

Test Results

Note:

During the entire period of three hours of sustained pressure, no leak was observed for any coupler. The couplers were disassembled to check for any component failure. No failure was observed in any coupler component. The couplers are therefore rated for the above sustained pressure.

TEST REPORT: RADIUS BEND FOR COMFIT COUPLERS

Purpose

To determine the impact of bend radius on Comfit Coupler pressure integrity under sustained pressure of 250 psi.

Specimens

Duct 1, 1 1/4 and 1 1/2 inch SDR11
Coupler 1, 1 1/4 and 1 1/2 inch nominal size to match the duct

Test Method and Conditions

The test was carried out on an assembly of two pieces of ducts joined together by a comfit coupler. The assembly was pressure sealed at one end and connected to pressure pump on the other end. The assembled coupler and ducts was placed in a fixture that can bend the duct at the prescribed bend radius. The vertical leg of the duct was tightly secured and was not allowed to move during the bending process. While the horizontal leg was allowed to move guided under a U-bolt. This arrangement caused stress on the coupler at the start of bend radius on the vertical leg. The assembly of duct and coupler was bent starting with maximum recommended bend radius for the duct size while under sustained pressure of 250 psi. The assembly was tested for any leakage at the comfit coupler.

After 15 minutes the bend radius was than decreased to next step while assembly was under constant pressure of 250 psi. The process was repeated till a radius of half the maximum bend radius for the duct size was achieved.

The table below lists the test bend radius for the duct sizes for which different coupler sizes was tested.

Pressure Source: Blackhawk Jack Protopower (Max. Press 10,000 psi)
Temperature: 60 F

Table of test parameters

Coupler Size	Duct OD	Vertical Leg Length	Horizontal Leg Length	Maximum Duct Bend Rad	1st Step Bend Rad.	2nd Step Bend Rad.	3rd Step Bend Rad.	Tinish Bend Rad.
in	in	in	in	in	in	in	in	in
1	1.315	18.000	32.000	14	10	9	8	7
1 1/4	1.660	15.000	35.000	17	14	12	10	8
1 1/2	1.900	12.000	40.000	19	16	12	10	8

Test Results

During the entire period of sustained pressure no leak was observed for 1 and 1 1/4 in coupler at any bend radius. A slight leak was noticed for 1 1/4 in coupler during the test when the bend radius reached 8 in.

It is concluded from tests, the comfit couplers are capable of sustained the pressure of 250 psi when installed with a bend radius far exceeding the recommended bend radius of the duct itself.

REPORT FOR PULL OUT TEST ON COMFIT COUPLER

Purpose

To determine the resistance to pullout forces on an assembled duct and comfit coupler.

Specimens

Duct 1, 1 1/4, 1 1/2 and 2 inch SDR 11
Coupler 1, 1 1/4, 1 1/2 and 2 inch nominal size to match the duct

Test Method and Conditions

The test was carried out on an assembly of two pieces of ducts approximately 12 in long joined together by the coupler. The force was applied gradually at each end of ducts by Tensile Testing Machine till the maximum pull force is reached. After the maximum load is reached the machine is stopped and sample removed for inspection. The failure is defined as separation or loss of grip of the coupler on either duct during the testing.

Tensile Testing Machine: Instron 4467 Tension Machine S/N C 1084
Temperature: 75 F

Test Results

At the maximum load the duct slipped out of the fixture that holds the duct to Tension Machine (slipped at thread joint between pulling eye and duct surface). However there was no slippage at the duct coupler joints. The couplers were disassembled to check for any component failure. No failure was observed in any coupler component. The couplers are therefore rated for the following safe tensile loads

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