Apollo Saturn Manual do Utilizador descarregar pdf (Página 67)

! $-TV_ STAGE PROPELLANT SVST_

_ite S-JV_ stage propellant syst+,m is composed of integr;ll LOX/Lil 2 tankg,

p._opo._._nnt iin_ control vaJvP.s 9 vents and pre_urlzat£on _ubsygtemso Loadtng

cf the prc_ella_c tank_ and flo_ of propellants i_ contro]led by the propell_,nt

utilization _'_tem. Both propellant tanks are lni_ially preosurized by ground

source cold helitn..

_JX tank _ressurizatJo_ during S-IVB stage burn is maint.]_.ned by hellum

suppi_.ed from spheres in the L]I? tank, _hich is expanded by passing through the

; heat ex'.'han_r, to maintain positive pressure across the co_on tank bulkhead

! and to satisfy engine net positive auction head, I,Ez _.ank pressur_zation during

; 5-ZVB stag_ burn is maintained by GII2 from the J-2 engine injector, Pressuriza-

tion o_ _he LH 2 tank strengthens the stage in addition to satlsfying engine nat

positive suction head.

Repressurization of the pr_ellnnt tanks, prior to J-2 engine .restarts, is

! sttalned by passing cold helium, from the helium spheres in the LH 2 _ank,

i through the O_/H 2 burner, The heated _ellum is then routed to the propellant

' ranks, Should the O2/H 2 burner fail, ambient repressurlzation will ensure

propellant p_essure engine restarts,

tank for

$-IVB PROPELLANTLOAD AND OPERATIONAL S_NCE

_r.,,

1970011707-070

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Apollo Saturn Manual do Utilizador Página 67