Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
52 Cards in this Set
- Front
- Back
|
2 types of plastic pipe? |
Thermosetting and Thermoplastic |
|
|
When did the Alberta government accept plastic pipe as a viable alternative to metal? |
1960 (early 1960's) |
|
|
What schedule plastic pipe can you thread, and what must you do when threading? |
Sched 80 or above. (available in sched 40, 80 & 120) * Need to plug the end of pipe with wooden plug so pipe doesn't collapse while threading |
|
|
Formula for expansion? |
Coefficient of exp. X temp change x pipe length |
|
|
Why should plastic pipe be stored in shade? |
UV rays can deform the pipe |
|
|
Advantages of plastic pipe (8) |
-resistant to wide range of chemicals -no electronic corrosion -smoother bore, less friction -absorbs shock/vibration -economical -easily prefabricated -easily joined -low absorption rate |
|
|
Disadvantages of plastic pipe (7) |
- high coefficient of expansion -low tensile strength -creeps (noise & stress on fittings) -deforms under load -low heat resistance -low ductility -low fire resistance |
|
|
What does 'creep' mean? ( plastic pipes) |
To move/proceed very slowly in the hangers, due to expansion/contraction from temp change |
|
|
Thermoplastic |
Materials that can be formed or reformed into different shapes, as many times as desired, using heat and/or pressure |
|
|
Thermosetting |
The resins react chemically (cross-linking). This means that once the chemical reaction has taken place, the shape or form cannot be altered. |
|
|
Coefficients of expansion for ABS and PVC |
ABS - 0.000099/°C or 0.000055/°F PVC - 0.0000594/°C or 0.000033/°F |
|
|
ABS - Acrylonitrile Butadiene Styrene is most commonly used in__________? |
Residential DWV - popular due to low cost and easy joining procedure -available from 1 1/4" - 6" @ 12' lengths |
|
|
Max working temp of ABS, PVC and CPVC? |
ABS = 180°F (82°C) PVC = 140°F (60°C) CPVC = 212°F (100°C) |
|
|
What color is ABS solvent? |
solvent = YELLOW, pipe = BLACK |
|
|
What is the greatest disadvantage of ABS? |
Supports combustion - which gives off toxic fumes |
|
|
What use was PVC originally developed for? |
Intermediate corrosion services in fume exhaust systems. - more corrosion resistant than ABS and self-extinguishing |
|
|
What colors are PVC pipe and solvent used? |
Solvent = GREY (or clear) Pipe = GREY (DWV) or white |
|
|
Most common joining methods for ABS? |
Solvent cement most common. Hot air welding also possible |
|
|
Why must you use cleaner/primer on all PVC pipe? |
Removes shiny surface permitting proper bonding of the surfaces |
|
|
How are PVC pipes generally joined? |
Solvent cementing |
|
|
Uses of CPVC? |
Similar in application to PVC. High working temperature so used in variety of applications, such as hydronic heating systems. Approved for use in hot and cold water lines |
|
|
Joining procedures for CPVC? |
Similar to PVC. ONLY CPVC SOLVENT CEMENT may be used!! |
|
|
Why is it dangerous to smoulder or melt PVC and CPVC? |
Gives off chlorine gas and other extremely toxic gases |
|
|
What color is fire suppression CPVC pipe? |
ORANGE |
|
|
What is the max working pressure of CPVC? |
400kPa or 58psi |
|
|
What are good practices for storing plastic pipe? |
- should not be stored in large piles - support throughout entire length, or supports no more than 1m apart - nesting (small diameter inside large diameter) - keep out of direct sunlight |
|
|
What is main use of PE (polyethylene) Pipe? |
Water, lab & GAS APPLICATIONS - max temp of 130°F - withstands attack by various chemicals |
|
|
Properties of PE-AL-PE pipe? |
Aluminium layer inside allows for easy bending and retains shape. - crimp, compression and socket fusion joining methods are available |
|
|
Properties and uses of PEX pipe? (cross-link polyethylene) |
- hot/cold domestic water, radiant heating - non oxygen permeable -variety of colours depending on manufacturer and usage - UV causes deterioration of outer coating -joined by crimp, expansion, compression and fusion |
|
|
Properties of Polybutylene PB? |
No longer made - grey, similar to PE |
|
|
Properties of polypropylene (PP)? |
Mainly used for lab drainage and distilled water systems. - joined with socket fusion welding or acid resistant mechanical couplings - brown |
|
|
Properties of proxylene? |
Similar to PP - BLUE - used for lab DWV |
|
|
Why is a straight cut important when using plastic pipe? |
Diagonal cut reduces bonding area in most effective part of the joint |
|
|
When is primer not required in joining plastic pipes? |
Only when using SYSTEM 15 pipe, fittings and cement |
|
|
What type of plastic pipe can be used on gas service lines? |
-PE pipe - must be orange or yellow and identified as high-density HD pipe - socket and butter fusion welding methods must be used |
|
|
Why must Cu tubes be provided at least 36" from HWT nipples? |
To protect PEX from higher temperatures |
|
|
What is the minimum surface temperature for solvent cementing plastic pipe? |
5°C |
|
|
What is the common trade name for PE-AL-PE pipe? |
Kitec |
|
|
Name these abbreviations : |
|
|
|
Valves should be installed with the stem and bonnet ________ on a pressure system? |
Vertical, or at least above the centre line |
|
|
What major issue is caused by fast closing a valve in water systems? |
Water hammer |
|
|
Name 2 types of power actuators |
Electric and pneumatic |
|
|
What are the 3 most important factors when choosing a valve ? |
Material, pressure, application |
|
|
Properties of a gate valve |
Must only be used in fully open or fully closed position |
|
|
Name the 4 main types of disc design used in gate valves |
Solid wedge - most common Flexible wedge split wedge Double disc |
|
|
Plastics used in the industry are synthetic organic materials called ________? |
Resins |
|
|
What are the 2 types of weld fittings? |
Butt weld Socket weld - 2" or smaller piping. Strong & secure joint |
|
|
How are forged steel Socket-welded fittings classified? What sizes are they available? |
1/2" - 4" inclusive |
|
Name these butt weld fitting markings... |
|
|
|
What is an alloy? |
Ferrous pipe containing iron ore and other metals (other metals such as copper and chromium) |
|
|
What are pressure ratings of different sched iron pipe? |
STD = up to 150psi XS = pressures of 200psi XXS = 1000psi and over |
|
|
How is iron pipe sized? |
Length = 1/8" to 24" Up to 12" inclusive = ID (nps) Above 12" = OD |
