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 10: Hydram construction - concrete (18 hours over a 7 day period)
View the document Handout 10A: Concrete hydram design parameters
View the document Handout 10B: Thickness of the impulse valve plate - inches
View the document Handout 10B: Thickness of the impulse valve plate - metric
View the document Handout 10C: Impulse valve steel backing - inches
View the document Handout 10C: Impulse valve steel backing - metric
View the document Handout 10D: Impulse valve seat width - inches
View the document Handout 10D: Impulse valve seat width - metric
View the document Handout 10E: Check valve backing thickness - inches
View the document Handout 10E: Check valve backing thickness - metric
View the document Handout 10F: Check valve seat width - inches
View the document Handout 10F: Check valve seat width - metric
View the document Handout 10H: Exploded view of 2- piece concrete hydram
View the document Handout 10I: Side view 2-piece concrete hydram
View the document Handout 10J: Two piece concrete hydram form
View the document Handout 10K: Two piece concrete hydram
View the document Handout 10L: One Piece Concrete Hydram Form
View the document Handout 10M: Problem
View the document Handout 10N: Materials and procedures

Handout 10A: Concrete hydram design parameters

CAVITY WALL THICKNESS

DOME COVER THICKNESS

NUMBER OF BOLTS AND SIZE

The side wall thickness (Ts) in a concrete Hydram without reinforcement shall be equal to the diameter of the cavity (Dc) in inches times the drive head (H) in feet divided by 10 or shall be equal to the cavity diameter, whichever is greater.

The top or bottom wall thickness (TL) should be 1.25 times the cavity diameter.


Concrete hydram design parameters

The total bolt area (TBA) should equal the drive pipe diameter (inches) squared times the drive head in feet divided by 50 or :




If D in mm. and H in meters then




To determine the proper number of bolts, find the area of the bolt size you wish to use and divide it into the total bolt area.

Diameter of bolt:

mm.

6.3

8

9.5

11

12.7

14 2

15.8

19.

22.2

25.4

in.

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

7/8

1

Area of bolt:

.027

.045

.068

.093

.126

.162

.202

.302

.419

.551