Possible Filling Method RevB.docx
DOCX document 20 KB Posted
- Attached to
- Fill & Paint Shielding Federal contract opportunity
- Solicitation number
- 1333ND24QNB130611
About this file
This document appears to be an appendix that outlines a possible method for filling and painting shielding supplies. The key steps include: weighing the empty shield, preparing and painting the shield tank, heating steel or stainless-steel shot to 280 degrees Fahrenheit, filling the shield with the heated shot and vibrating to minimize voids, weighing the filled shield, melting wax to 185-200 degrees Fahrenheit and pouring it into the shield, weighing the shield again, and then welding on fill caps and applying additional paint coats. The document references specifications in the Statement of Work (SOW) and task order for this process. This appendix does not appear to be part of a specific federal solicitation, but rather a template or example of a process that has worked for the National Institute of Standards and Technology (NIST) in the past.
View the file
Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Amendment 0002_.docx | DOCX document | |
| SurfacePrepGuide.pdf | ||
| Provisions_Clauses.pdf | ||
| CSS_SOW_Fill_Paint NG7_NG5 Shields.docx | DOCX document | |
| shield light blue paint data.jpg | JPG image |
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Text version
Appendix A - A Possible Filling Method That Has Worked for NIST
1. Weight each empty shield and record it.
2. Prep paint shield tank per specifications on SOW and task order.
3. Apply a coat of paint to empty shield tank. It is easier to handle when empty. Follow paint specifications in section in SOW. Additional coats can be applied after shield is filled.
4. Heat Steel or Stainless-Steel Shot to a uniform temperature of 280 Degrees Fahrenheit prior to proceeding to step 5. This is so that the heated wax does not cool down too much, thus becoming solid, before reaching the bottom of the shield. The temperature of the wax shall not exceed 250 Degrees Fahrenheit. The specifications for steel and stainless-steel shot can be found in SOW.
4.1. In the past, companies have filled the steel shot in the shield first. Then they put the entire assembly in an oven. If the winning company decides this works, the lower and upper temperature limits stated in step 4 still apply.
5. Fill each shield with heated steel shot; recommended to use a concrete vibrator to minimize voids.
6. Weight each shield after step 5 is complete and record it. Use this weight and the weight of empty tank to ensure that step 5 was satisfied in a manner that minimizes voids in the shot and achieves a packing density of 55%.
6.1. The actual weight must not deviate from the assembly drawing notes more than 4%.
7. Melt Wax. The wax must be between 185 and 200 Degrees Fahrenheit to begin pouring into the shield (which should already contain the heated steel shot at 280 degrees Fahrenheit by now).
8. Fill each shield with the specified wax.
8.1. It should be noted that depending on the complexity of the geometry of the shield, it might be best to partially fill the shield with shot. Then, fill the wax to the same level of the shot. Repeat those steps until the shield is full of shot and wax. Also, wax will settle after initial fill; it may need to be topped off several times.
9. Weight each shield after step 8 is complete.
9.1. The actual weight must not deviate from weight indicated on the drawing by more than 4%.
10. Once step 9 is complete, and the shield’s weight is within 4% of the theoretical weight, weld fill caps on shield and grind flat.
11. Apply coats of paint as needed so that the shield is fully painted. Detailed paint specifications can be found in the SOW.
File details come from the government source that posted it. Updated .