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13xxp

1.     why would PE pressure rated pipe and fittings be made with the same inside diameter as the equivalent schedule 40 iron pipe size while the outside diameter varies with the wall thickness?    These pipes are designed to be used with standard insert fittings
2.     in what condition would an engineer specify pipe and fittings with higher pressure ratings than required by the maximum system operating pressure or temperature for a plastic piping system?     
        Water hammer conditions are anticipated                        
3.     what jointing technique is used for pipe made from cross linked pe?  
# O! r- S$ i. }  m        threading                    
) B2 S- L6 R% Y4 f0 ]& M4.     how should abs pipes used for compressed air be connected to the metal components of the system?        With adapters or composite unions
2 Y( o# a5 ?( d" Z8 q  M9 F* ~  J' L5.     what type of piping is made from pvc type 3 plastic        
  ~3 u+ M( W6 m  {! F" g6 C9 t0 G      non pressure piping, such as conduit and drain piping   
6 S% j% Y; W* Y9 ~" E% j# d6.     what should be done is the bearing load imposed at the point of support on the outside of a plastic pipe could damage the pipe wall ?
insert a protective sleeve of plastic between the pipe and the hanger or support.
; A- [' [9 Y2 `, k* ~1 J7.     what can happen if cooling of the pipe below the installation temperature results in excessive tensile forces being placed on the piping connections?             Pullout, especially from compression joints
8.     what are the only two fluids that polytetrafluoroethylene (PTFE)is not inert to?          Elemental fluorine and molten alkali metals
* _7 f: A& G( O0 Z9.     what colour of liner is associated with FTFE?         
    white
10.besides the gaskets, what must be installed between the faces when joining the flange of lined pipe to the flange of an unlined pipe?  
. _* f7 j7 E! w9 q# gA flat full face spacer ring.
  S) Y' @3 _. g  C0 d  E$ D+ A$ K11.what type of end do the manufactures recommend on a thin wall alloy pipe for connection to a flanged lined piping system?  
     Stub end with a lap joint flange.
# l* N3 G  `+ ^. z/ J- ]& \12.what is done to prevent thin wall liner from twisting inside the casing if torque is applied to the formed gasket face?
         A perforated steel locking collar is set behind the liner face.
' P9 p5 o( i6 G2 t& p% M! M7 Z13.what is the most common cause of rejection for a lined piping spool or component in a piping installation?
$ A; T* I9 }2 Y- }3 G1 w7 P5 rLiner has been damaged in transit to its position in the assembly.
14.what special precautions must be taken when welding around or near lined piping system?
# d; U6 o- p# \3 j0 \Ensure that the lined pipes are not acting as a ground conductor for the welding machine.

Daniel_Wu

1 为什么PE耐压管件及附件均采用40寸的标准内径钢管，而其外径却因管壁厚度不同而不同？
  这些管材被设计用来插入标准附件使用。
: f( j- }5 f0 [2 在塑料管道系统中，在什么情况下工程师们采用耐压强度高于系统设计压力及温度的管材及附件？
% z" Y- G0 {9 G) V  考虑水锤作用时。
& U- H# l" c3 w& n# V: t0 R$ q3 十字连接的PE采用何种联结方式？
1 n, _. K$ _- }! K1 S: [2 U& N) S  丝扣连接。
4 压缩气体管道如何与系统的金属部件相连接？
  通过适配器或专用连接装置。
5 什么类型的管道系统采用3型PVC塑料管道？
! r9 F- I5 B+ I: P, ~- F  无压力管道，例如给排水管。
3 w  }; w- Q0 Q8 y. t) m6 如何应对支撑结构可能对塑料管管壁接触部位造成损伤？
7 \8 C! q. K8 @7 B! X  在支撑结构与塑料管之间加入一层薄片塑料。
% W) h1 n! {0 h+ g7 如果温度降低到系统安装温度以下，冷缩拉力会对系统管道连接造成何种影响？
  拉出，尤其是受压管道。
, q, J4 p& M  ~! R! r7 {3 V8

老大，太长了......

苹果酱

#2楼真是好人呀

愿你有好报！

木野

8.     what are the only two fluids that polytetrafluoroethylene (PTFE)is not inert to?          Elemental fluorine and molten alkali metals
什么是使PTFE(聚四氟乙烯?)呈惰性的唯有的两个流度?  "自然力的"氟和熔化碱性金属