TRSV Cutaway

Closed Stroke 0%

Shut in · equalised

Closed, with 4,700 psi above and below the flapper. Press Pressure up to open.

Operate

Control line0 psi

Tubing above flapper4,700 psi

p_surf=p_vo+p_t+p_mo−D·ρ 6,247=1,800+4,700+500−753 set pointvalvetubing, livemarginhydrostatic

Setting depth D2,000 ft

Opening margin p_mo500 psi

Now: 0 psi at surface + 753 hydrostatic = 753 psi on the piston.

ρ = 0.377 psi/ft (0.87 SG hydraulic oil). Pressure up pumps to the set point. The equation assumes no differential across the flapper.

Opening ↓ control line on piston0 lbf

Closing ↑0 lbf

Spring 0 Tubing on piston 0 Flapper Δp 0

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To scale. Piston 0.40 in², flapper 18 in² (illustrative).

Flow tube moving · last 90 s · hover for values