Statement_of_Work.pdf

STATEMENT OF WORK

Introduction:

The proposed work to be performed involves retrofitting the existing bead blast unit with a fire suppression system in order to meet National Fire Protection Association (NFPA) and Occupational Health and Safety Administration (OSHA) Standards.

Scope of Work:

There are five areas of concern regarding the management of explosive dust hazards within the corrosion control bead blast unit; explosive vent discharge, upstream isolation of blast booth, inadequate exhaust ventilation, downstream isolation of waste stream, and elimination of static producing fittings. All equipment and installation methods must meet NFPA 69 and NEC standards.

Inadequate space and facility limitations has reduced options for corrective action. The installation of chemical isolation devices based on Sodium Bicarbonate (NaHCO3) is the preferred method. Installation of system chemical isolation system includes all control units, pressure indicators and applicable hardware.

The vendor is to remove and replace the slide gate in the downstream waste collection barrel and install a rotary valve that meets NFPA 69 requirements. Remove and replace all rubber/silicone transition boots and replace with metal tubing to eliminate potential static energy hazards.

Explosion Vent Discharge

Problem - Explosion vents discharge inside of the bead blast room. The pressure and flame front created by a deflagration could structurally damage the room and injure the occupants of the bead blast room and building occupants.

The unit is inadequately protected from a deflagration. Using dust analysis the value was Kst

140. The explosive discharge vent size was verified at 22 x 24 (528 in2). Referring to NFPA 68, Chapter 8, Standard on Explosion Protection by Explosion Venting it was determined the minimum vent size required was 523 in2.

Desired Corrective Action - Installation of Chemical isolation devices release suppressant that extinguishes the ignition source before the flame/pressure front can propagate. One unit in the exhaust portion, one unit in large particle separator, and one unit in the fines separator, for a total of three devices.

Upstream Isolation of Blast Booth/Cabinet

Problem - There is no explosion isolation equipment to protect upstream and downstream operations and personnel in the event of a deflagration within the dust collector.

Desired Corrective Action - Installation of Chemical isolation devices release suppressant that extinguishes the ignition source before the flame/pressure front can propagate.

Inadequate Exhaust Ventilation

Problem - Exhaust air from the dust collector is discharged into the bead blast room.

Desired Corrective Action - Installation of a Chemical isolation devices release suppressant that extinguishes the ignition source before the flame/pressure front can propagate. Will require the rotation of exhaust vent and the addition of vent pipe.

Down Stream Dust Collection Drum

Problem - The dust collection drum and the flex tube connecting the dust collector cone to the collection drum are fabricated from plastic or synthetic material and are not electrically conductive. It is possible that a static charge/discharge may occur that could ignite the explosible material passing from the cone to the collection drum.

Desired corrective action - Install a rotary valve that meets NFPA 69 requirements.

Electrical Discharge Hazards

Problem - Non-bonded flex tubing is used to connect the dust collector cone and the collection drums. There is the possibility that static charge/discharge may occur that could ignite explosible material passing through it.

Desired corrective action - Remove and replace non-bonded flex tubing with metallic transition boots to provide grounding properties and eliminate potential static energy hazards.

Period of Performance:

The desired completion date is 60 days after date of award.

Purchase Description:

All requirement descriptions below state desired functionality. The dealer will be responsible to determine what additional components, hardware, etc. will be necessary to deliver a fully functional and compliant system. Based on initial analysis, the projected parts required are listed below. This is not a comprehensive list.

Dust Collector Protection Unit and Install Reclaim Hopper Protection Unit and Install Mounting Brackets (2) and Install Waste Stream Rotary Valve Unit and Install Exhaust Fan Ducting Extension and Redirection

Acceptance Criteria:

The Wing Safety office will be present and oversee the install at various stages of completion (30, 60, 90, and 100%) to verify that the work is done safely and in accordance with NFPA and OSHA guidelines. Once complete, the final product will be evaluated for functionality and compliance.

Other Requirements:

Hazards present in the work area:

1. Hexavalent Chromium (CrVI) is present on some surfaces. Personal protective equipment may be required in some areas.

2. Hearing protection is required due to proximity to the flight line.