| I pulled this description of the 39-A & 39-B launch Pad facilities
off the WWW JSC home page from some obscure menu. There's a lot
of facts & numbers that make for somewhat interesting reading.
It had to be edited (after being pulled off the WEB server) to fit
on a normal 80 column text page.
Happy reading.
-Bob
Launch Complex 39-A & 39-B
--------------------------
Launch Complex 39's Pad A and Pad B were originally designed to support
the Apollo program and were modified for Space Shuttle launch operations.
Major changes included the erection of a new Fixed Service Structure (FSS),
addition of a Rotating Service Structure (RSS), and the replacement of the
Saturn flame deflectors with three new flame deflectors. The upper portion
of the Saturn V Launch umbilical tower was removed from two of the Apollo
Mobile Launchers and installed at the pad to serve as the FSS.
Fuel, oxidizer, high pressure gas, electrical, and pneumatic lines connect
the Shuttle vehicle with ground support equipment and are routed through
the FSS, RSS and Mobile Launch Platform.
Space Shuttle access and servicing at the pad are provided by:
FSS - Gaseous Hydrogen Vent Arm for electrical power and for venting hydrogen
from the external tank.
RSS - Mid-Body Umbilical Unit for fuel cell servicing and life support
functions.
RSS facilities for loading and off-loading payloads.
Hypergolic Umbilical System for servicing the Orbiter systems with fluids
and gases.
Gaseous Oxygen Vent Arm for preventing ice formation atop the external tank.
Orbiter Access Arm (OAA) for crew entrance and exit.
MLP - Tail Service Masts for propellant loading and electrical power.
The FSS is topped by a 24.4 meter (80ft) tall fiberglass lightning mast
grounded by 335 meter (1,100ft) cables that are anchored north and south
of the pad. The Mast provides lighting protection for pad structures and
the Space Shuttle.
The RSS accommodates the loading of payloads vertically at the pad. It is
mounted on a semi-circular track which allows it to rotate through an arc
of 120 degrees on a radius of 36.6 meters (120 ft). The RSS pivots from a
hinge on the FSS until the RSS spacecraft changeout room fits flush with
the Orbiters's cargo bay. This room allows payloads to be installed or
serviced under contamination-free or "clean room" conditions.
Blast-protected hypergolic storage and supply systems are provided at each
pad, and the Launch Processing System (LPS) is used to monitor all aspects
of vehicle and payload operations. The LPS system interconnects to the MLP
through Hardware Interface Modules (HIM's) located in Pad Terminal
Connection Rooms beneath the pads.
Pad's 39-A and 39-B are virtually identical and roughly octagonal in shape.
The distance between pads is 2,657 meters (8,715 ft). The pad base contains
52,000 cubic meters (68,000 cubic yards) of concrete. The ramp leading up
to the pad is inclined at a 5% grade. The flame trench is 13 meters (42 ft)
deep, 137 meters (450ft) long and 18 meters (58 ft) wide. The orbiter flame
deflector is 11.6 meters (38ft) high, 22 meters (72 ft) long and 17.5
meters (57.6 ft) wide. It weights 590,000 kg (1.3 million lbs). The SRB
deflector is 12.95 meters (42.5 ft) high, 12.8 meters (42 ft) long and 17.4
meters (57 ft) wide. It weights 499,000 kg (1.1 million lbs). The Sound
Suppression Water System is used to protect the launch structure from the
intense sound pressure of liftoff. It's water tank is 88.9 meters (290ft)
high and has a capacity of 1,135,000 liters (300,000 gallons).
There are 6 permanent and 4 extensible pedestals that are used to support
the MLP at the pad.
Dynamic loads at rebound are 3,175,200 kg (7,000,000 lbs) to 4,762,800 kg
(10,500,000lb) at liftoff. The pad is lit with 5 clusters of Xenon
high-intensity searchlights (total searchlights: 40) around the pad
perimeter.
The height of the Fixed Service Structure (FSS) is 105.7 meters (347ft)
to the top of the lightning mast (referenced to the pad base) and the
Rotating Service Structure (RSS) is 57.6 meters (189ft) high. The Fixed
Service Structure (FSS) and Rotating Service Structure (RSS) on Pad 39A
underwent a renovation between June and September 1993. Some 13,773 gallons
of paint were used on two coats and 1,866 tons of sand were used in the
sandblasting operation.
The LC-39 Launch complex also contains large liquid oxygen (LOX) and
Liquid Hydrogen (LH2) storage tanks. These are large ball-shaped vacuum
jacketed dewar bottles used to store supercold cryogenic propellants for
the shuttle external tank. The LOX tank, located at the northwest corner
of the pad stores 3,406,500 liters (900,000 gallons) of liquid oxygen at
a temperature of minus 183 degress C (-298 F). The LH2 tank is located at
the northeast corner of the pad and stores 3,218,250 liters (850,000
gallons) of liquid hydrogen at a temperature of minus 253 degrees C
(-423 degrees F).
The Weather Protection System protects orbiter tiles from wind blown
debris, rain and hail. Wheeled metal doors that ride on steel beams are
attached to the Rotating Service Structure and the Fixed Service Structure.
Doors slide together (to within 3 inches of each other) between the
orbiter's belly and the external tank, providing protection for the lower
portion of the orbiter.
East Door, attached to the RSS measures 16 meters (53 ft) long, 8 meters
(27 ft) tall and weighs 19 metric tons (42,000 lbs).
West Door, attached to the FSS measures 13 meters (43 ft) long, 11.6 meters
(38ft) tall and weighs 21 metric tons (46,000 lbs)
The top of the orbiter is shielded by an inflatable seal extending from
the Payload Changeout Room forming a semi-circle covering 90 degrees of
arc between the orbiter and its external tank. The sides of the orbiter,
between the vehicle and the external tank, are protected by a series of
20 metal bi-fold doors that fold out from the Payload Changeout Room.
The doors measure 24.4 meters by 1.2 meters (80ft x 4ft).
There is approximately 1.25 million feet of tubing and piping at Launch
Complex 39, varying in sizes from .25 inches to 114 inches in diameter.
This is enough pipe to reach from Orlando to Miami.
__________________________________________________________________
Last Updated Thu Oct 28 17:06:51 EDT 1993
Jim Dumoulin ([email protected])
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