SUBSEA BLOWOUT PREVENTER RIGGING • DUAL-LANE TRAILER • DYNAMIC BRAKING SHEAR

Subsea BOP Stack CoG & Tie-Down Calculator

Simulate the elevated vertical center-of-gravity for assembled deepwater BOP stacks, verify multi-axle perimeter trailer load distribution, and calculate Grade 100 chain shear lashing capacity against 0.5g deceleration.

Stack & Transporter Parameters

BOP Stack Mass (Tons) 450 tons

Combined Lower Stack, LMRP, control pods, and transit test base.

Assembled Stack Height (ft) 32.0 ft

From wellhead connector guide funnel to flex joint riser flange.

Transporter Axle Lines & Deck Type

Road Cross-Slope / Camber (%) 3.5%

Superload route crown, banking superelevation, or shoulder dip.

Tie-Down Restraint Lashing Lines

Calculated Axle Loads & Restraint Margins

OPTIMAL • ROUTE PERMITTABLE

Vertical CoG Height

11.8 ft

Above Well Deck

Axle Line Load

16.2 t

<18.0 t Limit (Pass)

Roll Overturning Margin

2.65x

Camber Safety Factor

Braking Shear Demand

450.0 kips

0.5g Deceleration Load

Dynamic Lashing Capacity vs Braking Shear 24x 5/8" Gr 100 Chains

Forward Braking Restraint Capacity 82.8% Utilized

Lateral Rollover Angle Limit 14.2° Critical Tipping Angle

Total Gross Weight: 518.0 Tons

Braking Safety Factor: 1.21:1 (Compliant)

API Spec 16D Superload Mandate: Subsea BOP stacks carrying 15,000-psi shear rams have high mass concentration in the lower third but critical hydraulic manifolds and accumulator bottles at the upper frame. Forward lashing must incorporate positive mechanical stop blocks welded directly to the transport skid cross-members, preventing dynamic forward sliding during emergency braking on interstate off-ramps.

Exspeedite Offshore Heavy Rigging

Request Subsea BOP Tie-Down & Route Engineering

Consult with our heavy transport architects and offshore structural engineers for turnkey BOP stack transport plans, bridge analysis, and quayside load-out coordination.