Full Line Product Catalog

Conduit Cleaners

Blower Hose and Storage/Carrier

8 in. x 15 ft. 203.2 mm x 457.2 cm) heavy-duty heat resistant self-storing hose Provides a positive hookup to blower, eliminating the possibility of it slipping off during operation, thus ensuring safe, breathable air in underground work sites When open, the highly visible, UV-resistant yellow hose fully expands for unobstructed air flow When closed, the single unit container stores and protects the hose, keeps your storage area less obstructed, and saves you money by extending hose life P/N 87143 Heavy Duty Blower Hose Weight: 9 lbs. (4 kgs) P/N 87144 Blower Hose Carrier Weight: 16 lbs. (7.26 kgs)

U NDERGROUND P ULLING E QUIPMENT

Confined Space Ventilation Among the many safety precautions that must be observed prior to entering a confined workspace, such as a manhole vault, is the monitoring, purging and ventilation of the space. Never enter a manhole, even momentarily, until it has been tested for combustible and noxious gases and then purged with the blower operating at a maximum rated speed for a length of time sufficient to make seven (7) complete changes of air in the space. See example below. (workspace volume ÷ blower capacity) X 7 = minutes of purge time). Consider this typical example: vault dimensions = 10' x 8' x 6' high = 480 cubic ft. blower capacity = 640 cubic ft. / min. with 1- 90° bend 480 ÷ 640 = .75 .75 X 7 = 5.25 minutes of purge time (5 minutes is considered to be the minimum purge time.) Once the workspace has been tested with a certified gas indicator confirming a satisfactory atmosphere and the space has been effectively purged of hazardous gases, only then can the workspace be entered while gas monitoring and fresh air ventilation continue for the duration of the time the space is occupied. The fresh air ventilator (blower) must be adequately sized to achieve twenty (20) complete air exchanges per hour. A rule of thumb calculation for ventilator sizing is: workspace volume ÷ 3 = ventilator CFM with 2 - 90° bends. For example, a manhole vault of 480 cubic ft. ÷ 3 = ventilator CFM of 160 with 2 - 90° bends.

Important Considerations: Effective ventilator (blower) capacity, as stated by the manufacturer must have been determined by precision airflow chamber test performed by an independent testing lab The ventilator inlet must be positioned upwind Ensure that the blower hose is not damaged and is securely connected to the ventilator outlet Position the blower hose with one bend for purging and two bends for ventilating as shown in the illustration to the left

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