A training manual in conducting a workshop in the design, construction, operation, maintenance and repair of hydrams
 Session 16: Use of multiple rams (1½ hours)
 Handout 16A: Series hydram installation Handout 16B: Waste water series hydram installation Handout 16C: Parallel hydrams 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.

Attachment 16-A

Site development

### Handout 16B: Waste water series hydram installation

Attachment 16-B

Waste water series hydram installation

Attachment 16-C

Site development

### Handout 16D: Sample problems

Attachment 16D

Problem 16A:

How much water can be pumped to a delivery head of 200 feet, when there is a drive head of 2 feet, a supply of 50 gpm, and an assumed efficiency of 50%?

Problem 16B:

A community of 200 people, with 70 cows, needs 5 gpd per person and 15 gpd per cow. A spring flows at a rate of 15 gpm, H = 10', h = 100', n = 50%, L:D = 960. How can the community's needs be met?

Problem 16C:

How much water can be delivered to a supply tank 50 feet above a hydram when the drive head is 5 feet, the hydrams efficiency is 50%, the flow rate of the water is 30 gpm, and the largest drive pipe available is 2"?