Vault Door Repairs
Properly functioning linear accelerator vault doors are vital to safe and efficient treatment. Malfunctioning doors should not be used until they are repaired. Our decades of experience in designing, installing, maintaining, and repairing cancer treatment vault doors gives us the expertise required to quickly diagnose and repair vault doors. We know that any down time can be costly, and our goal is to develop and implement long-lasting repairs that provide reliable future operation.
In addition to doors designed and installed by Pitts Little, we can also service and repair most swinging and sliding vault doors from other manufacturers.
Some of the problems that we commonly see and successfully repair include:
– Doors slamming closed
– Doors not fully closing
– Safety Interlocks (limit switches) not engaging
– Bolted hinge failure
– Operator failure
– Gearbox / motor noise
Our experienced team is available to help troubleshoot operational issues, and to design and implement long-term solutions. Give us a call today!
Pitts Little Corporation offers high density (HD) concrete up to 300 pounds per cubic foot. High density concrete gives a composite shield for both neutron and gamma radiation. High density aggregates are the key ingredient in high density concrete. The most common aggregates used to achieve the required densities are Hematite (Fe2O3), Ilmenite (FeO TiO2), Magnetite (Fe3O4) and Steel Aggregate.
The standard sizes of interlocking high density concrete blocks are 6” x 6” x 12” and 4” x 6” x 17”. Additional sizes are available upon request.
In addition to poured, pumped or conveyed high density concrete, Pitts Little Corporation also offers a complete line of high density blocks for radiation shielding. These include two sizes of chevron type interlocking HD blocks where grout is optional, two sizes of solid rectangular HD blocks with matching density HD grout and a 2-core HD masonry unit with matching density HD grout. These multiple size and shape options provided a simple solution to adding space-saving shielding to any wall, ceiling and floor without having to endure lengthy construction delays. You may also choose to work with your own local mason or concrete contractor to save money on installation.
6” Thick Interlocking High Density Concrete Blocks
 | Size: 6” thick x 6” tall x 12” wide Stock Densities: 240# per cubic foot / 3.84 grams per cubic cm 250# per cubic foot / 4.00 grams per cubic cm 300# per cubic foot / 4.81 grams per cubic cm |
4” Thick Interlocking High Density Concrete Blocks
 | Size: 4” thick x 6” tall x 17″ wide Stock Densities: 240# per cubic foot / 3.84 grams per cubic cm 250# per cubic foot / 4.00 grams per cubic cm 300# per cubic foot / 4.81 grams per cubic cm |
Solid Rectangular HD Blocks & Matching Density HD Grout
 | Sizes: 4”x4”x16” (Pictured) 4”x8”x16” Stock Densities: 250# PCF/4.01 GCC or 300# PCF/4.81 GCC |
Custom High Density Concrete Blocks
 | We can produce solid pavers or multiple cavity high density CMU blocks. 2-Core HD Masonry Units & Matching Density HD Grout Size In-Stock: 12”x16”x4” (Pictured) Stock Densities: 250# PCF/4.01 GCC or 300# PCF/4.81 GCC |
More Information
Product Details:
Made in the USA of the finest polymers available. Available in 1%, 2% or 5% boron content (by weight) or virgin formulas.- High cross-section for consistent neutron attenuation.
- Advanced processes and precise tolerances ensure superior flatness and consistent density.
- 1″x4’x8′ sheets allow for easy installation.
- Grade II and III materials are closely inspected and controlled in accordance with MIL-P 23536A revision A and hipyard specifications.
- Independent lab results available (charges apply).
- Supplied in mill shapes, such as sheets, blocks and slabs.
- Can be machined to your specifications.
- Custom/proprietary colors available with appropriate minimum order.
- Easily fabricated using standard woodworking tools.
- Used in US fighting ships and radiation oncology.
High Dose Radiation (HDR) Enclosures typically take substantial shielding for the walls, doors and ceiling. Pitts Little Corporations HDR enclosures are site specific lead enclosures. We do not take a one size fits all approach to the rooms. The length, width and height are as requested by the facility. The lead thickness will be as specified by the physicist of record.
Using Pitts Little Corporation’s interlocking lead bricks can be an ideal solution for your radiation shielding needs. The efficient interlocking chevron shape allows the bricks to stack neatly, eliminating any line of sight seams, and therefore, any radiation leakage in the wall. The interlocking lead bricks are manageable, easy to assemble and disassemble, require no mortar and can be used in new construction or to augment existing shielding.
Pitts Little Corporation’s interlocking lead bricks have a standard face of 4” X 12” and thicknesses of 3/4”, 1”, 1-1/2”, 2” and 2-1/2”. These interlocking lead bricks can be cut to any size and custom sizes are available. These bricks are generally used in nuclear shielding or in radiation therapy applications such as PET Scan Rooms, Gamma Knife Rooms, HDR Rooms or Linear Accelerator Vaults. The interlocking lead bricks can also be used for ballast weight, as counter balances, in temporary/ permanent storage areas or in any place where additional shielding or weight is needed and space is at a premium.
Interlocking lead bricks and straight lead blocks are available. We will be happy to provide a quotation to furnish and install interlocking lead brick shielding at your facility. Lead bricks are available coated with epoxy paint. Steel tubes may be used if support is required. Please see the pictures below of some of our recent installations.
Our direct Shield High Energy Door allows the clinic to maximize space and avoid the need for an elaborate concrete maze. The Pitts Little Sliding Door incorporates the latest mechanical and technological improvements available.
Custom Steel Construction
A-36 material, heavy duty frames and ¼” and 3/8″ cover plates.
Door Contents
ASTM B29 LEAD and 5% borated polyethylene, with removable back panel for shielding design changes.
Door Operator (Operating System)
Uses an electric motor with batter back-up for uninterrupted service. Battery power will allow door to open only.
Standard Safety Features
- Safety bumper with a minimum 2″ crush zone
- Battery backup
- “E” Stop Button
- Interlock Switches
- Other options available upon request.
All components for the door fabrication and installation are manufactured and installed by Pitts Little’s skilled craftsmen, who will install all mechanical and technical components. All wire and conduit will be furnished by the electrical contractor.
All doors are warranted against defect for at least one year.
Custom designs available upon request. Contact us to learn more.
More Information
- Operation and Maintenance
- Full Operation Manual for Sliding Doors
- Sliding Vault Door Specifications
- Plan and Elevation Views of Sliding Door
- Sliding Doors Operator Control Schematic
- PLC Light Chart
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This type of door and frame assembly is designed to support the high weight resulting from shielding materials located in the core of the door.
Custom Steel Construction
A-36 steel with at least 1/4″ and 3/8″ thick faces, and heavy duty rails and stiles that are manufactured from 3/4″ thick A-36 steel.
Custom Adjustable Hinges
Precision machined, anti-friction needle roller bearings and are matched to at least twice the weight of the door. One pair of hinges is supplied per door installation.
Closer/Operator
Designed for ease of installation, durability, and reliability. Each operator is matched to the door’s physical dimensions and weight.
Door Contents
ASTM B29 LEAD and 5% borated Polyethylene, as designated by the physicist and architectural specifications.
Door Fabrication and Installation
All components are manufactured and installed by Pitts Little Corp’s skilled craftsmen. Frames and doors are shipped to the jobsite: doors, operators, and kill switches are installed by our crews. Frame installation and electrical connections are installed by others.
All doors are warranted against defect for at least one year.
A Leader in Radiation Shielding Materials
205-833-5911