1605 SE EVERETT MALL WAY WALMART 2025-09-10

6. Backfill -The trench shall be backfilled between joints before testing to prevent El El El movement of pipe.Thrust blocks and or restrained joint systems shall also be left uncovered for inspection. 7. Joints-Joints shall be inspected for visual leakage El El El 8. Thrust Blocks-Thrust blocks shall be installed as per approved set of plans and El El El placed between undisturbed earth and the fitting to be restrained and shall be capable of resisting the calculated thrust forces. Wherever possible,thrust blocks shall be placed so that the joints are accessible for repair. 9. Release Pressure-After verifying that the system has maintained the required 200 El El El psi for 2 hours, release pressure from the system to verify that the gauge is operating properly. Flushing: PASS FAIL N/A 10. Before Connection- Underground piping,from the water supply to the system El El El riser, and lead-in connections to the system riser shall be completely flushed before the connection is made to downstream fire protection system piping. 11. Pre-Flushing- Pre-flushing shall be conducted by the contractor to ensure all El El El foreign materials have been flushed from the system prior to the fire inspector conducting the official flush test. 12. Flushing Operations- Flushing operations shall be set-up and conducted El El El complying with the following: • The discharge used for the flush shall be located in close proximity of the lead-in connection to the system riser. • Water shall be discharged through an open ended 4-inch pipe or through a 4-inch pipe connected to a Y or siamese connection with two 2% inch hoses. • There shall be two burlap bags connected to each outlet. • Flow rate shall be at a minimum of 390 gpm. • See the examples 1,2, and 3 of the acceptable configurations for flushing of the system 13. 10-Minute Cycles-The fire inspector will conduct the flush test in 10-minute El El El cycles, after each cycle the inspector will inspect the burlap bags located at the outlets for foreign materials.These cycles will continue until water is clear and the bags are free of all foreign materials. Note:After two cycles, if significant materials are still present in the bags the inspector will reschedule the remainder of the test for a different time to allow for the contractor to continue pre flushing the system. Fire Marshal's Office 425.257.8100 1 everettwa.gov/fire I INFORMATION HANDOUT C-6 4.13.2020 I Page 2