28133867
Description
Flashcards by stephen lowe, updated more than 1 year ago
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Created by stephen lowe
over 3 years ago
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| Question | Answer |
| Units of measurements plumbers use | Millimetres mm Centimetres cm Metres m |
| Tools used to measure | Steel Rule Tape Measure Site Tape Laser Distance |
| Tools used to bend copper | Hand Bender Scissor Bender Stand Bender Electric Tube Bender Internal Spring External Spring |
| Grades of copper | R220 Coiled Microbore R250 Half Hard Straight Lengths R220 Underground |
| Diameter of copper | Minibore/microbore: 6, 8, 10mm Small bore: 12, 15, 22mm Large bore: 28mm and larger |
| Coated copper | Yellow Gas Green Water White General Purpose Blue Wholesome Water |
| Radius centre line | 4 x Diameter of the pipe (4D) |
| Radius of a pipe | Radius x 2 x 3.14 4 |
| X dimensions | Centre of fitting to the engaged length |
| Grades of LCS | Heavy Red Steam and fire systems Medium Blue Heating and oil lines Light Brown Gas |
| LCS jointing methods | Threading Welding Special Compression Joints |
| LCS protection | Galvanized (Inside and outside) Denso tape (Wrapped outside only) Paint (Outside only) Chemical (Inside only) |
| Bending LCS | When bending, it stretches in both directions. LCS stretches by its nominal bore: ½in = 15mm ¾in = 20mm |
| Z dimensions | Centre of fitting to the engaged length |
| Threading | Free Standing Machine Handheld Threading Machine Handheld Die |
| Types of plastic | PVCu MDPE HDPE Polypropylene Polybutylene ABS |
| Polypropylene | Waste pipes Overflow CWSC Degrades in direct sunlight Feels slightly greasy to touch Not solvent welded |
| Polybutylene | Cold water Hot water Central heating Push fit Compression Not solvent welded |
| ABS Acrylonitrile Butadiene Styrene | Commercial water Waste Overflow Solvent welded Degrades in sunlight |
| PVCu | Unplasticised polyvinyl chloride Cold water Soil pipes Waste and overflow pipes Guttering and downpipe Not suitable for hot water Solvent weld Push fit |
| MDPE | Medium density polyethylene Underground mains (blue) CWSC Degrades in sunlight Fusion welded Push fit Compression |
| HDPE | High density polyethylene Underground mains (black) Degrades in sunlight Fusion welded Push fit Compression |
| Bending | Plastic pipe is usually fabricated using fittings on waste pipes. Polybutylene (hot, cold and central heating) is flexible and can be laid around corners, if supported. |
| X dimensions | On plastic, the X dimensions are manually measured and worked out |
| Soil and waste plastic | PVCu plastic is used for push fit and solvent welded soil, waste pipes, overflow pipes, guttering and below ground drainage. 110mm, 50mm, 40mm, 32mm and 21.5mm |
| soil and waste plastic | Polyethylene (PE) is used a lot in the plumbing trade Medium density polyethylene (MDPE), is hardwearing and is used for water mains (blue) and gas mains (yellow). It degrades when exposed to UV light. 20mm-63mm in coils. The most common is 25mm cold water service pipe High density polyethylene (HDPE), was used some years ago and is still found in properties but it was superseded by MDPE |
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