DESCRIPTION
Wyo-Ben Therm-EX Grout is an engineered system for use as backfill material in earth-coupled heat pump systems. Its elevated thermal conductivity and low permeability allow for excellent heat exchange while protecting groundwater supplies. Therm-EX Grout should be pumped using a positive displacement pump capable of generating pressures in excess of 300 psi. Developed using high swelling Wyoming Bentonite, this new generation of grouting material offers efficient installation of closed-loop geothermal heat pump systems.
MATERIAL SPECIFICATIONS
| Thermal Conductivity | 0.93 Btu/hr-ft-°F | 1.05 Btu/hr-ft-°F |
| Permeability | 2 x 10-8 cm/sec | 6 x 10-8 cm/sec |
| Solid Content | 64 % | 67 % |
| Slurry Weight | 13.6 lbs/gal | 14.4 lbs/gal |
| Slurry Volume/Batch | 29 gals | 36 gals |
| Thermal Conductivity | 1.13 Btu/hr-ft°F | 1.2 Btu/hr-ft-°F |
| Permeability | 6 x 10-8 cm/sec | 6 x 10-8 cm/sec |
| Solid Content | 69 % | 71 % |
| Slurry Weight | 15.1 lbs/gal | 15.2 lbs/gal |
| Slurry Volume/Batch | 41 gals | 41.5 gals |
APPROXIMATE VOLUMES FOR GROUT
| Drilled Hole Dia. | Loop Inside Dia. | Anlr. Vol. (cu.ft./ft) | Anlr. Vol. (gal/ft) |
|---|---|---|---|
| 4 | 3/4″ | 0.08 | 0.57 |
| 4.5 | 1″ | 0.09 | 0.70 |
| 5 | 1″ | 0.12 | 0.89 |
| 5.5 | 1″ | 0.15 | 1.10 |
| 6 | 1″ | 0.18 | 1.33 |
| 5 | 1-1/4″ | 0.11 | 0.84 |
| 5.5 | 1-1/4″ | 0.14 | 1.05 |
| 6 | 1-1/4″ | 0.17 | 1.29 |
APPLICATION
The combination of fresh water, THERM-EX GROUT™ and silica sand constitute “the system” for backfilling geothermal loops. Use locally available dry silica sand. For best results, use sand ranging in size from 30 mesh to 70 mesh (AFS GFN particle size classification 38 to 50). Mix as follows.
| .93 Btu/hr-ft-0F | 1.05 Btu/hr-ft-0F | 1.13 Btu/hr-ft-0F | 1.2 Btu/hr-ft-0F | |
|---|---|---|---|---|
| Water | 17 gal | 20 gal | 21 gal | 22 gal |
| THERM-EX GROUT™ | 1 – 50 lb bag | 1 – 50 lb bag | 1 – 50 lb bag | 1 – 50 lb bag |
| Silica Sand | 200 lbg | 300 lb | 350 lb | 400 lb |
Add the THERM-EX GROUT™ to the water while agitating. Mix for approximately one minute, then add the sand. Agitate until the sand is uniformly dispersed and pump into place using a tremie line. For best results, place the tremie line near the bottom of the loop and pump into place. Providing local regulations allow, slowly extracting the tremie line as you come up the hole reduces pump pressure, aids the grout in setting quicker, and reduces the opportunity for formation damage.
To increase work time for deep sets, you may add THINZ-IT® to the make-up water. Addition rates may vary, but generally 2 ounces to make-up water yields the desired results.
About Wyo-Ben
Wyo-Ben, is a privately held, family-owned business. They have been in business since 1951, and are a leading producer of Wyoming Bentonite Clay based products. Their materials are used globally in applications such as oil, gas, water well drilling, environmental construction and remediation, hazardous waste treatment, cat litter, cosmetics and pharmaceuticals, as well as many other industrial and consumer related products. Headquartered in Billings, Montana, Wyo-Ben mines from its reserves in the Big Horn Basin region of Wyoming and processes a multitude of products from its three plant facilities which serve a global marketplace.
DISCLAIMER: If ordering less than a pallet, call for availability 918-895-6759. (Standard Pallet size is 48 count per pallet, with some exceptions.
