- 1 -
Item Requirement
Product
Name
국문 : 한국형발사체 66L 복합재 고압탱크 경량 라이너
영문 : 66L Liners for Composite Overwrapped Pressure Vessels of KSLV-II
Model
AL6061-T6 66L Liner
Specific
ation
1. Requested Items
□ Seamless Al6061-T6 liners
❍ Quantity of delivered products : 60 EA
※ Minimum quantity of 50 should be guaranteed.
※ If the quantity of delivered products is less than 60, a
refund must be offered as the amount of the unit price of
liner (including that of shipping box) multiplied by the
number of insufficient liners.
❍ Additional two liners, besides the delivered products, have to
be manufactured for use with destructive inspection and
mechanical property test.
※ These liners will be overwrapped with a high-strength CFRP
in a Korean company to make Type III high pressure vessels.
2. Requirements for Seamless Al6061-T6 liners
(1) The machining process is not allowed to be used on the outside
surfaces of liners except both ports.
(2) The shape and detailed dimensions of liner are given in the
attached drawing.
❍ The dome outer contour, the outer diameter, and the overall
length can be modified according to the applicant’s
circumstances. But the final decision depends on KARI’s
judgment.
(3) Weight ≤ 8.1 kg
(4) Capacity = 66L +2L/-0L
(5) The thickness of cylinder wall = 2.0 ± 0.25 mm (0.078 ± 0.009
inch)
❍ For all liners, 3 mutually equidistant points in the axial
- 2 -
Item Requirement
Product
Name
국문 : 한국형발사체 66L 복합재 고압탱크 경량 라이너
영문 : 66L Liners for Composite Overwrapped Pressure Vessels of KSLV-II
direction, 4 points (90° interval) in the round direction should
be checked up. --> Total 12 points inspected
Fig. 1. Thickness Measurement Points
Ÿ Ultrasonic thickness checker should be used.
- Ultrasonic thickness checker should be calibrated with
standard thickness specimen before check up.
(6) The thickness of dome area near to both ports ≥ 6.5 mm
❍ For all liners, 8 points (90° interval,
both ports) in the round direction
should be checked up.
Ÿ It should be measured at the 80Φ
point
※ 80Φ point: 40 mm away from the
center of port.
Ÿ Ultrasonic thickness checker should
be used.
(7) Outer Diameter = 361.0 ± 1.0 mm
❍ The above nominal value is preferred, but it can be changed
between 355.0 mm and 380.0 mm according to the
applicant’s circumstances.
(8) Overall Length of Liner = 831.0 ± 2.0 mm
❍ The above nominal value is preferred, but it can be changed
Fig. 2. 80Φ Points
- 3 -
Item Requirement
Product
Name
국문 : 한국형발사체 66L 복합재 고압탱크 경량 라이너
영문 : 66L Liners for Composite Overwrapped Pressure Vessels of KSLV-II
between 775.0 mm and 835.0 mm according to the
applicant’s circumstances.
(9) Both Ports
❍ Length = 30.0 ± 3.0 mm
❍ Inner Thread Spec. : 3/4”-16UNF-2B
❍ Outer Thread Spec. : M30×1.0
❍ Thread assembly tests should be done with the standard
3/4”-16UNF-2B bolt and M30×1.0 nut.
(10) Requirements for Surface Conditions
❍ Inner surface
Ÿ Stabbing marks, stains and other foreign substances are
not allowed in operation. --> Endoscope inspection for all
liners.
※ Surface treatment for corrosion protection is preferred.
Ÿ Crack and surface dent are not allowed. --> PT test to
ASTM E1417 for randomly selected 2 liners.
※ This is related to
No.(10) Destructive Inspection.
❍ Outer surface
Ÿ Crack and surface dent are not allowed. --> PT test to
ASTM E1417 for all liners
(11) Destructive Inspection
❍ Randomly selected two liners in the same production batch
should be cut in half, and then inspected carefully. After
destructive inspection, two coupons should be taken from
one half-liner for the mechanical property tests.
Ÿ A checklist for the destructive inspection on all four
half-liners should include the following points
(i) Dimension of liner cross section check up
(ii) PT test to ASTM E1417 for inner surface
- 4 -
Item Requirement
Product
Name
국문 : 한국형발사체 66L 복합재 고압탱크 경량 라이너
영문 : 66L Liners for Composite Overwrapped Pressure Vessels of KSLV-II
(12) Requirements for Materials and Properties
❍ AL6061 --> T6 heat treatment
Ÿ Yield Strength = over 260 MPa
Ÿ Ultimate Strength = over 300 MPa
Ÿ Elongation : 14%(2 inch Gage), 10%(24t×6t)
Ÿ Hardness : Min. 85(Brinell), 50(Rockwell “B” scale)
❍ Al liner material property test should be done more than two
coupons taken from destructive inspection liners on every
production batch.
※ This is related to
No.(10) Destructive Inspection.
(13) Required Documents
❍ Drawings
❍ Mil sheet or CoC of raw materials (AMS QQ-A-200/8 applied)
❍ Heat treatment reports
❍ Shape and dimension inspection reports (including Ultrasonic
Thickness inspection reports)
❍ Other inspection reports
Ÿ PT inspection, Weight inspection etc.
❍ Material property test reports
❍ Other documents related with product assurance (PA) process
(The list of required documents are to be determined by
mutual agreement.)
(14) Shipping material
❍ Wooden box with foam cushions, individually packaged,
which allows enough space so that the liner when
overwrapped can still be packaged in the same box.
작성일자 : 2018. 7. 17
