University:
The University of Manchester
Course:
MECH64000 | Dissertation (Mechanical Engineering Design)
Academic year:

2021
Views:

132

Pages:

17
Author:

Charlee Buchanan

Question 4-[25 marks] a) Where does sanitary plumbing become drain-laying? 11 mark] Where waste pipe pass from above to below ground Sasponded fleur dong b) List and explain 3 causes of trap failure. 13 marks) Any 3 of induced siphonage, compression, oscillation, Capillary action, poor workmanship with accompanying explanation c) What is the difference between a waste water fixture and a soil fixture? 12 marks] Waste water fixture receives all waste water that is not soil. Soil is solid and/or liquid excreted human waste. 11 mark each) d) Where can a waste water fixture discharge pipe discharge to? [2 marks) A gully trap A discharge stack [1 mark each] e) Where can a soil fixture discharge pipe discharge to? Directly to a drain [2 marks) To a stack [1 mark each] f) A toilet block on a single floor is to have all fixtures discharge into a single graded discharge pipe with a gradient of 1 in 40. The toilet block contains 5 water closet pans and 2 basins. What is the minimum diameter required for the graded discharge pipe. [5 marks] Calculate discharge units from Table 2: (5 x 4(WC)) + (2 x 1 (Basin)) = 22 Read from Table 80mm diameter Table 4: Disharge unit loeding for stacks graded focharge pipes Paisgrohe 43.2.4.140.1 Diameter Maximum discharge from any one floor Vertical stack (Note 1) Graded discharge pipes Minimum gradient 1:20 1:30 1:40 1:50 1:50 40 0 4 50 15 15 10 80 13 40 65 30 20 16 100 65 195 376 248 182 142 115 Nota Sheded Toral loading at the of the discharge stack TABLE 3.2.4 PROBABLE SIMULTANEOUS FLOW RATES (PSFRs) Loading units PSER LA Loading units PSFR LA Loading units PSFR 1./s 0.09 0.12 0.14 0.16 0.18 0.20 789 10日 7 0.22 0.24 0.25 0.39 41 0.55 0.40 42 0.56 041 43 0.57 0.42 44 0.58 0.43 45 0.58 0.43 46 0.59 0.44 47 0.60 0.45 48 0.60 0.46 49 0.61 0.26 0.47 50 0.62 11 0.28 0.48 51 0.62 12 0.29 0.49 52 0.63 13 0.30 0,49 53 0.64 14 0.31 0.50 54 0.64 15 0.33 35 0.51 0.65 16 0.34 36 0.52 56 0.65 17 0.35 37 0.52 57 0.66 18 0.36 0.53 58 0.67 19 0.37 19 0.54 59 0.67 20 0:38 0.55 60 0.68