Glass fiber reinforced plastic pipeline as an example, about how to accurately grasp the span of FRP pipe in the underground oil transportation project.
FRP pipe is mainly used in petroleum, chemical and drainage industries. In recent years, the production of glass fiber reinforced plastic pipeline in our country is developing rapidly, and the number is growing year by year. The glass fiber reinforced plastic pipe is made of resin, which is used to transport drinking water with food grade resin, glass fiber and quartz sand. There are a lot of glass fiber reinforced plastic pipe is used in the underground pipeline, of course, some of the pipeline under the span of the problem is relatively long span. Underground pipe is a tube frame, hanger, bracket for supporting the supporting points of the distance between the two is called the pipeline span, the span of course not too it will affect the normal work of the pipeline, if the span is too small, it will allow the glass steel pipe layout is more concentrated, and the investment cost of the corresponding increase, because the glass the increase in the amount of steel pipe, in this regard, in order to ensure pipeline safety and normal operation, of course, as far as possible to expand the span of the pipeline.
Of course, if we want to solve this problem, we must determine the strength and stiffness of FRP pipe two conditions:
(1) determine the pipe span according to the strength condition
Under the action of external load, the maximum stress of FRP pipe interface should not exceed the self weight of FRP pipe.
(2) determine the span of pipe according to the rigidity condition
The pipeline has a certain deflection in a certain span, which is limited to the allowable range, and thus determine the span of the pipeline.
(3) as part of FRP pipe is the underground operation, before the design should consider to be clear about the depth and weight of buried pipeline above, this is also an important criterion to determine the span of the FRP pipe, if the pipes are buried deep, filled soil will more, then the weight will be bigger, the glass steel pipes under the condition of the span will be shortened, and the relatively shallow buried, above the light weight, can lengthen the span of the pipeline. In short, according to the actual construction environment to adjust the pipe span to ensure the normal use of FRP pipe.