THROUGH BULKHEAD INITIATORS (TBI)

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Pyroalliance designs and produces a series of Through-Bulkhead Initiators (TBI) for the European Ariane and Vega launcher families.
TBIs are designed to ignite the propellant in a solid rocket motor and also guarantee tightness after functioning between upstream and downstream side of bulkhead, preventing any pressure loss.
They are a key component of the propulsion function reliability/safety. TBIs belong to a pyrotechnic chain which ensures transition from a detonating signal stemming from a detonating transfer line into the combustion of an ignition load, across a tight barrier.

TBIs, combined with other Pyroalliance’s products, are part of Ignition pyro-chains for solid rocket motors or retro-rockets. They are designed and manufactured under Pyroalliance design authority

Through Bulkhead Initiator at a glance

Pyroalliance’s TBI flies on Ariane 5 and Vega ©ArianeGroup and ESA

Benefits of pyrotechnics

Structural barrier preventing loss of pressure of downstream elements
Mass savings through the reduced quantity of embedded electrical power
Free from primary explosives, therefore one single Safe & Arm Device at the beginning of the pyrotechnic chain is sufficient
Reduced dispersion of ignition times
High level of safety (EMC and lightning immunity)

Space applications

Single pulse solid propellant motors ignition, from retro-rockets (few kilograms) to heavy boosters.

Please scroll down to discover more specifications on TBI:
Key figures, product operation mode video, the complete product sheet to download.

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Key figures of pyrotechnic performance

TECHNICAL SPECIFICATIONS	OUR RANGE OF PERFORMANCE
OPERATING TIME:	< 5ms
OUTPUT ENERGY:	Range of 3000 J
IGNITION MODE:	Detonating line
DONOR & RECEIVER LOADING:	RDX
LEAK RATE:	Better than 10-6 scc/sec after functioning
OPERATING TEMPERATURE:	-53°C to + 71°C
STORAGE LIFE TIME	7 years (depending on storage conditions)