We NK Pressure Cylinder Technology (Shanghai) Co., Ltd is a subsidiary of NK CO., LTD. We feature in pressure cylinder, like CNG tube trailer, ASME air storage vessel, Y-ton cylinder and onboard fire fighting system, ballast water treatment system. 
Technical data of tube trailer of 8 tubes: 
Standard:DOT-3AAX and DOT E8009; Maximum working pressure 20 mpa
Cylinder specification:DOT-3AAX-2900
Size: outer diameter 559mm*10980mm
Water volume:2.25 m3
Total volume of one set tube trailer:18m3
Material: Cr-Mo Steel / 4130X
Volume/weight of natural gas: 4500m3 / 3296kg
Cylinder weight: 2780kg
Weight of tube trailer (empty):around 25200kg
Size of tube trailer:12.2*2.44*1.4mm
After-sales Service Commitment (respond in 2 hours and arrive at your site in 48hours)
1. We have well trained aftersales technial supporting team, whose job includes: telephone service, on site service, problem shooting down, problem prevention, technical training and technical support.
2. We have full range of spare parts in stock for tube trailers after sales service
3. document registration
 
every time we go to fix a problem for our customer, we request our technial staff to fill in a service report and have it signed by the customer. this report shall be kept in files for reference.
set up a product file data base
We set up a equipment file for customer for the convenience that both the customer and we are able to refer to the actual usage and working condition of the products
information of the data base includes: customer name, address, telephone No, contact person, purchase time, warranty and warranty period, maintenance record and inspection records
ASME Air Storage Vessel
Applies to refeuling station/air producers and users
Product Specification
outer diameter24' * length20.6" * 3 cylinders
volume 3,900L * 25mpa * ASME standard material
main data
standard: manufactured according to ASME Sec. VIII Div, Appendix 22
product specification: natural gas seamless steal air storage vessel
design teperature: -40℃ to + 93.3℃
design pressure: 27.6 Mpaworking pressure: 25.0 Mpa
material: SA372 Grade J. Class 70.cylinder size: outer diameter 609.6mm * thickness 29.4mm * length 6250mm
weight:3,120Kg X 3
water volume:  1.3M3 X 3
natural gas volume: 1,168m3