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close this book A training manual in conducting a workshop in the design, construction, operation, maintenance and repair of hydrams
close this folder Session 16: Use of multiple rams (1½ hours)
View the document Handout 16A: Series hydram installation
View the document Handout 16B: Waste water series hydram installation
View the document Handout 16C: Parallel hydrams
View the document Handout 16D: Sample problems

Session 16: Use of multiple rams (1½ hours)

Time 1½ hours

Objective:

By the end of this session trainees will describe how multiple rams, in series or parallel can be used in situations where h:H ratio, L:D ratio, or D make single ram unpractical or impossible.

Overview:

In small groups, trainees will solve problems to determine that single ram is impossible, and describe and size multiple system for meeting water need. Large group will discuss advantages/disadvantages of these systems, including cost efficiency.

Materials:

Handouts 16A, 16B, 16C, 16D

 

Problems 16A, 16B, 16C on flip chart

 

Flip charts, markers

Procedures:

Notes

1. Introduce session by reviewing limitations of hydram in terms of:

10 min.

- maximum h:H

 

- L: D ratios

 

- cost of galvanized pipe in large sizes

 

State objectives of session.

 

2. Form 3 small groups and assign each group one problem form Handout 16D. Distribute the relevant diagram (16A, B. or C) to the appropriate group.

 

The group task is to:

Allow 30 minutes for this.

- solve problem

 

- determine why single ram will not work

 

- study diagram and determine why the multiple ram arrangement will work

 

- size the multiple ram system

 

- plan 10 minute presentation to the large group

 

3. Representatives from each group present and answer questions.

30 min.

4. Ask large group to describe any additional advantages/disadvantages of multiple ram systems, any other situation they might be used in.

10 min.

5. Ask participants what application series/parallel rams have at their sites.