機器
big
buried
circle
commercial
construction
corrugated
diameter
ditch
drain
drainage
engineering
equipment
extruded
extrusion
flexible
hdpe
helical
hose
industrial
industry
infrastructure
internally
large
largediameter
laying
line
low pressure
manufacturing
oil
olefin
operations
pipe
pipelaying
pipeline
pipelining
pipework
piping
polyethylene
pressure
pvc
racker
repair
services
structural
technique
technology
tubing