Skirted Storage Silos

Efficiently Utilize Your Plant’s Outside Storage Space

Large or small, few industrial operations can afford to use expensive plant floor space for storing large quantities of raw materials that could be economically stored outside in large silos.

Using a BROCK® Bulk Storage System lets you use your building for productive manufacturing rather than storage. It also allows you to buy in larger, money-saving quantities.

Brock’s broad line of bolted-steel, skirted, hopper-bottom silos offers you the capacities and features you need today – in a silo that will allow you to grow into tomorrow.

Storage Capacities

440 through 6,150 cubic feet (12 through 174 cubic meters)

Silo Diameters

9 to 18 feet (2.7 to 5.5 meters)

Photos & Videos:

Features

Storage Capacities to Meet the Needs of Many Operations

Capacities range from 440 through 6,150 cubic feet (12 through 174 cubic meters). Silo diameters range from 9 to 18 feet (2.7 to 5.5 meters).

High-Strength Roof

The sturdy, low-profile (10-degree slope) roof has a 22-inch (56 cm) fill opening and 12-inch (305 mm) discharge opening with 16×16-inch (41×41 cm) universal flange.

Built-In Features for Added Safety and Restricted Access

The skirted hopper area and walk-through door can be locked to limit access to the silo’s contents and conveying equipment.

Additionally, a ladder security door attaches securely to the silo’s exterior ladder to discourage its use.

Your Choice of 45° or 60° Center Draw Unloading Hoppers

Wide Variety of Options

A variety of ladder and door options are available, such as a unique silo ladder with safety cage, lockable door and crosswalk designed to meet OSHA specifications.

Other options include:

Rooftop perimeter guard rail and toe board
Manholes
Pressure relief valves
View windows

Specifications

Skirted Storage Silo Capacities:

All Diameters 9 Ft. (2.7 M) Diameter 12 Ft. (3.7 M) Diameter 15 Ft. (4.6 M) Diameter 18 Ft. (5.5 M) Diameter Skirted Storage Silos Specifications

Skirted Storage Silos

Diameter Feet (Meters)	Model Number	Approx. Capacity Maximum Cu. Ft.	Approx. Capacity Maximum M³	Usable Capacity Cu. Ft.*	Usable Capacity M³*	Height To Lid Feet	Height To Lid Meters
45° Hopper Angle 3-Ring Skirt
9 ft. (2.7 m)	S45-00932	439	12	385	11	15.1	4.6
9 ft. (2.7 m)	S45-00933	608	17	554	16	17.8	5.4
9 ft. (2.7 m)	S45-00934	777	22	723	20	20.4	6.2
9 ft. (2.7 m)	S45-00935	946	27	892	25	23.1	7.0
9 ft. (2.7 m)	S45-00936	1,115	32	1,061	30	25.8	7.9
60° Hopper Angle 4-Ring Skirt
9 ft. (2.7 m)	S45-00902	514	15	460	13	17.8	5.4
9 ft. (2.7 m)	S45-00903	684	19	630	18	20.4	6.2
9 ft. (2.7 m)	S45-00904	854	24	800	23	23.1	7.0
9 ft. (2.7 m)	S45-00905	1,019	29	965	27	25.8	7.9
9 ft. (2.7 m)	S45-00906	1,189	34	1,135	32	28.4	8.7
45° Hopper Angle 3-Ring Skirt
12 ft. (3.7 m)	S45-01232	803	23	662	19	14.8	4.5
12 ft. (3.7 m)	S45-01233	1,102	31	961	27	17.2	5.2
12 ft. (3.7 m)	S45-01234	1,400	40	1,259	36	20.1	6.1
12 ft. (3.7 m)	S45-01235	1,698	48	1,557	44	22.8	6.9
12 ft. (3.7 m)	S45-01236	1,997	57	1,856	53	25.5	7.8
12 ft. (3.7 m)	S45-01237	2,295	65	2,154	61	28.1	8.6
60° Hopper Angle 5-Ring Skirt
12 ft. (3.7 m)	S45-01202	966	27	825	23	20.1	6.1
12 ft. (3.7 m)	S45-01203	1,265	36	1,124	32	22.8	6.9
12 ft. (3.7 m)	S45-01204	1,563	44	1,422	40	25.5	7.8
12 ft. (3.7 m)	S45-01205	1,861	53	1,720	49	28.1	8.6
12 ft. (3.7 m)	S45-01206	2,160	61	2,019	57	30.6	9.3
45° Hopper Angle 4-Ring Skirt
15 ft. (4.6 m)	S45-01532	1,386	39	1,096	31	17.8	5.4
15 ft. (4.6 m)	S45-01533	1,854	52	1,564	44	20.4	6.2
15 ft. (4.6 m)	S45-01534	2,323	66	2,033	58	23.1	7.0
15 ft. (4.6 m)	S45-01535	2,792	79	2,502	71	25.8	7.9
15 ft. (4.6 m)	S45-01536	3,261	92	2,971	84	28.4	8.7
15 ft. (4.6 m)	S45-01537	3,730	106	3,440	97	31.1	9.5
15 ft. (4.6 m)	S45-01538	4,199	119	3,909	111	33.5	10.3
60° Hopper Angle 6-Ring Skirt
15 ft. (4.6 m)	S45-01502	1,734	49	1,444	41	23.1	7.0
15 ft. (4.6 m)	S45-01503	2,200	62	1,910	54	25.8	7.9
15 ft. (4.6 m)	S45-01504	2,666	75	2,376	67	28.4	8.7
15 ft. (4.6 m)	S45-01505	3,132	89	2,842	80	31.1	9.5
15 ft. (4.6 m)	S45-01506	3,599	102	3,309	94	33.8	10.3
15 ft. (4.6 m)	S45-01507	4,065	115	3,775	107	36.4	11.1
45° Hopper Angle 4-Ring Skirt
18 ft. (5.5 m)	S45-01832	2,120	60	1,600	45	18.0	5.5
18 ft. (5.5 m)	S45-01833	2,791	79	2,271	64	20.6	6.3
18 ft. (5.5 m)	S45-01834	3,463	98	2,943	83	23.3	7.1
18 ft. (5.5 m)	S45-01835	4,134	117	3,614	102	26.0	7.9
18 ft. (5.5 m)	S45-01836	4,805	136	4,285	121	28.6	8.7
18 ft. (5.5 m)	S45-01837	5,476	155	4,956	140	31.3	9.5
18 ft. (5.5 m)	S45-01838	6,148	174	5,628	159	34.0	10.4

Notes

*Approximate Usable Storage Capacity with 30° Angle of Repose

Diameter Feet (Meters)	Model Number	Approx. Capacity Maximum Cu. Ft.	Approx. Capacity Maximum M³	Usable Capacity Cu. Ft.*	Usable Capacity M³*	Height To Lid Feet	Height To Lid Meters
45° Hopper Angle 3-Ring Skirt
9 ft. (2.7 m)	S45-00932	439	12	385	11	15.1	4.6
9 ft. (2.7 m)	S45-00933	608	17	554	16	17.8	5.4
9 ft. (2.7 m)	S45-00934	777	22	723	20	20.4	6.2
9 ft. (2.7 m)	S45-00935	946	27	892	25	23.1	7.0
9 ft. (2.7 m)	S45-00936	1,115	32	1,061	30	25.8	7.9
60° Hopper Angle 4-Ring Skirt
9 ft. (2.7 m)	S45-00902	514	15	460	13	17.8	5.4
9 ft. (2.7 m)	S45-00903	684	19	630	18	20.4	6.2
9 ft. (2.7 m)	S45-00904	854	24	800	23	23.1	7.0
9 ft. (2.7 m)	S45-00905	1,019	29	965	27	25.8	7.9
9 ft. (2.7 m)	S45-00906	1,189	34	1,135	32	28.4	8.7

Diameter Feet (Meters)	Model Number	Approx. Capacity Maximum Cu. Ft.	Approx. Capacity Maximum M³	Usable Capacity Cu. Ft.*	Usable Capacity M³*	Height To Lid Feet	Height To Lid Meters
45° Hopper Angle 3-Ring Skirt
12 ft. (3.7 m)	S45-01232	803	23	662	19	14.8	4.5
12 ft. (3.7 m)	S45-01233	1,102	31	961	27	17.2	5.2
12 ft. (3.7 m)	S45-01234	1,400	40	1,259	36	20.1	6.1
12 ft. (3.7 m)	S45-01235	1,698	48	1,557	44	22.8	6.9
12 ft. (3.7 m)	S45-01236	1,997	57	1,856	53	25.5	7.8
12 ft. (3.7 m)	S45-01237	2,295	65	2,154	61	28.1	8.6
60° Hopper Angle 5-Ring Skirt
12 ft. (3.7 m)	S45-01202	966	27	825	23	20.1	6.1
12 ft. (3.7 m)	S45-01203	1,265	36	1,124	32	22.8	6.9
12 ft. (3.7 m)	S45-01204	1,563	44	1,422	40	25.5	7.8
12 ft. (3.7 m)	S45-01205	1,861	53	1,720	49	28.1	8.6
12 ft. (3.7 m)	S45-01206	2,160	61	2,019	57	30.6	9.3

Diameter Feet (Meters)	Model Number	Approx. Capacity Maximum Cu. Ft.	Approx. Capacity Maximum M³	Usable Capacity Cu. Ft.*	Usable Capacity M³*	Height To Lid Feet	Height To Lid Meters
45° Hopper Angle 4-Ring Skirt
15 ft. (4.6 m)	C45-01532	1,386	39	1,096	31	16.7	5.1
15 ft. (4.6 m)	C45-01533	1,854	52	1,564	44	19.3	5.9
15 ft. (4.6 m)	C45-01534	2,323	66	2,033	58	22.0	6.7
15 ft. (4.6 m)	C45-01535	2,792	79	2,502	71	24.7	7.5
15 ft. (4.6 m)	C45-01536	3,261	92	2,971	84	27.3	8.3
15 ft. (4.6 m)	C45-01537	3,730	106	3,440	97	30.0	9.1
15 ft. (4.6 m)	C45-01538	4,199	119	3,909	111	32.7	10.0
15 ft. (4.6 m)	C45-01539	4,668	132	4,378	124	35.4	10.8
60° Hopper Angle 6-Ring Skirt
15 ft. (4.6 m)	C45-01502	1,734	49	1,444	41	21.6	6.6
15 ft. (4.6 m)	C45-01503	2,200	62	1,910	54	24.3	7.4
15 ft. (4.6 m)	C45-01504	2,666	75	2,376	67	26.9	8.2
15 ft. (4.6 m)	C45-01505	3,132	89	2,842	80	29.6	9.0
15 ft. (4.6 m)	C45-01506	3,599	102	3,309	94	32.3	9.8
15 ft. (4.6 m)	C45-01507	4,065	115	3,775	107	34.9	10.6
15 ft. (4.6 m)	C45-01508	4,531	128	4,241	120	37.6	11.5

Diameter Feet (Meters)	Model Number	Approx. Capacity Maximum Cu. Ft.	Approx. Capacity Maximum M³	Usable Capacity Cu. Ft.*	Usable Capacity M³*	Height To Lid Feet	Height To Lid Meters
45° Hopper Angle 4-Ring Skirt
18 ft. (5.5 m)	S45-01832	2,120	60	1,600	45	18.0	5.5
18 ft. (5.5 m)	S45-01833	2,791	79	2,271	64	20.6	6.3
18 ft. (5.5 m)	S45-01834	3,463	98	2,943	83	23.3	7.1
18 ft. (5.5 m)	S45-01835	4,134	117	3,614	102	26.0	7.9
18 ft. (5.5 m)	S45-01836	4,805	136	4,285	121	28.6	8.7
18 ft. (5.5 m)	S45-01837	5,476	155	4,956	140	31.3	9.5
18 ft. (5.5 m)	S45-01838	6,148	174	5,628	159	34.0	10.4