Type 81 Ram Type BOP
Manual Dimensions & Specification Data
| DIMENSIONS |
| Description |
Style |
7-1/16 x 3M |
9 x 3M |
| Overall Height Studded (Less Studs) |
Single | 13" | 13-1/4" |
| Double | 20-1/2" | 22-1/2" |
| Triple | 30" | 31" |
| Overall Height Flanged |
Single | 21-3/8" | 23-3/4" |
| Double | 30-3/8" | 33" |
| Triple | 38-3/8" | 41-1/2" |
| Overall Length |
63" | 65" |
| Overall Width |
22" | 25" |
| Through Bore |
7-1/16" | 9" |
| Working Pressure (lbs) |
3,000 | 3,000 |
| Test Pressure (lbs) |
6,000 | 6,000 |
| BOP CAPACITIES |
| Description |
7-1/16 x 3M |
9 x 3M |
Notes |
| Maximum Operating Pressure (PSI) |
1,500 | 1,500 |
Manual operation requires stable hydraulic assist |
| Recommended Operating Pressure (PSI) |
1,500 | 1,500 |
Consistent with hydraulic Type 81 |
| Ratio to Close |
4.1:1 | 4.5:1 |
Matches hydraulic ram ratios |
| Volume of Fluid to Open (U.S. Gallons) |
0.55 | 0.62 |
Manual units use identical piston chambers |
| Volume of Fluid to Close (U.S. Gallons) |
0.68 | 0.75 |
Same as hydraulic Type 81 |
| Piston Stroke (inches) |
4-1/8" | 5-1/8" |
Manual & hydraulic share stroke lengths |
| WEIGHTS |
| Description |
7-1/16 x 3M |
9 x 3M |
| Single |
Studded | 1,250 | 1,500 |
| Flanged | 1,495 | 1,760 |
| Double |
Studded | 2,200 | 2,700 |
| Flanged | 2,470 | 2,960 |
| Triple |
Studded | 2,925 | 3,500 |
| Flanged | 3,295 | 3,760 |