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UHP Process Piping | Utility Gas Distribution

Ultra High-Purity Process Piping for

Semiconductors and LCD Display Devices

CREST HPL is precision-engineered and manufactured welded-as-seam-less (WSL) according to stainless steel pipe specifications of ASTM A312 and/or JIS G3459 with the specific purpose of servicing ultra high-purity applications in the area of semiconductor, LCD display device and polysilicon industries.  For the process piping works of bulk utility gas distribution, scheduled pipe sizes up to OD 24-inches (609.60mm), or even greater sizes, are offered in EP BA MP AP finishes.

Pipe Size Dimension
OD [NPS or A-size (mm)] WT [mm]
8 (219.08) 3.76
10 (273.05) 4.19
12 (323.85) 4.57
14 (355.60) 6.35
20 (508.00) 9.53
40A (48.6) 1.65
50A (60.5) 1.65
65A (72.3) 2.10
80A (89.1) 2.10
100A (114.3) 2.10
150A (165.2) 2.80
200A (216.3) 2.80
250A (267.4) 3.40
300A (318.5) 4.00
400A (406.4) 7.92
500A (508.0) 9.53
600A (609.6) 9.53
Code Specifications Choice of Pre-Materials Surface Finish (max)
AP A213/A269
A269/A270
A312
JIS G3459
304L
316L
SUS316L (JIS)
316L (sulfur 0.005%~0.017%)
ID Weld Bead Removed Annealed
OD < 32 RA < 0.8 μm
MP A213/A269
A269/A270
A312
JIS G3459
304L
316L
SUS316L (JIS)
316L (sulfur 0.005%~0.017%)
ID < 20 RA < 0.5 μm
OD < 32 RA < 0.8 μm
BA A213/A269
A269/A270
A312
JIS G3459
304L
316L
SUS316L (JIS)
316L (sulfur 0.005%~0.017%)
ID < 15 RA < 0.4 μm
OD < 32 RA < 0.8 μm
EP A213/A269
A269/A270
A312
JIS G3459
304L
316L
SUS316L (JIS)
316L (sulfur 0.005%~0.017%)
ID < 10 RA < 0.25 μm
OD < 32 RA < 0.8 μm

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