Cover Image
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.

 

Handout 16A: Series hydram installation

Attachment 16-A


Site development

Handout 16B: Waste water series hydram installation

Attachment 16-B


Waste water series hydram installation

Handout 16C: Parallel hydrams

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"?