DEPARTMENT OF HEALTH AND SOCIAL SERVICES

Division of Public Health

Statutory Authority: 16 Delaware Code, Chapter 79, 7903

(16 Del.C., Ch. 79, 7903)

FINAL

ORDER

4455 Delaware Regulations Governing a Detailed Plumbing Code

NATURE OF THE PROCEEDINGS:

FINDINGS OF FACT:

SUMMARY OF EVIDENCE

4455 Delaware Regulations Governing a Detailed Plumbing Code

1.0 Adoption and Effective Date

*Please Note: Below are the Delaware specific amendments to the Delaware Plumbing Code. The 2003 International Plumbing Code is adopted by reference and a copy of the complete Delaware Plumbing Code and amendments is available for public view at Georgetown State Service Center, 544 South Bedford Street, Georgetown, DE 19947 (302-856-5496) or Thomas Collins Building, Suite 5, 540 S. Dupont Highway, Dover, DE 19901 (302-744-1220).

2.0 Additions, Deletions, Amendments and Clarifications

Table 1

Occupancy:

Assembly, Restaurants

Water Closets:

Male:

1 per 75

 

Female:

1 per 75

Lavatories:

 

1 per 200

Drinking Fountains:

 

1 per 500

Others:

 

1 service sink

PROCEDURE FOR SIZING A GREASE TRAP TO A SPECIFIC FIXTURE

EXAMPLE OF SIZING FOR GREASE TRAP SELECTION

Select a grease trap for a three compartment warewashing sink with bowl dimensions of 18" W x 24" L x 12" D

GREASE TRAP SIZING FOR TYPICAL SINK INSTALLATIONS

9 DE Reg. 786 (11/01/05)

1.0 State of Delaware Plumbing Code

2.0 Adoption of International Plumbing Code.

3.0 Miscellaneous Provisions

4.0 Special Provisions Regarding Plumbing For Food Establishments

Table 4.16.3a

EXAMPLE OF SIZING FOR GREASE TRAP SELECTION

Select a grease trap for a three compartment warewashing sink with bowl dimensions

of 18” W x 24” L x 12” D

1. Volume = (18in x 24in x 12in) x 3 cmpts = (5,184 cu in) x 3 = 15,552 cubic inches

2. Capacity = Volume (cu in) / 231 (cu in/gal) = 15,552 / 231 = 67.3 gallons

3. Drainage load = 67.3 gal x 0.75 = 50.4, or approx. 50 gallons

4. Unit flow rate minimum = 50 gallons / 2 minutes = 25 gallons per minute (gpm)

Unit liquid holding capacity minimum = 67.3 x 0.40 = 26.9 gallons

5. Select a grease trap with a minimum flow rate equal to or greater than 25 gpm

The selected trap also must have a minimum liquid holding capacity of 26.9 gal.

Table 4.16.3b

GREASE TRAP SIZING FOR TYPICAL SINK INSTALLATIONS

 

Bold column at far right applies PDI G101 formula to calculate minimum required grease trap flow rate in gallons per minute (gpm).

Width (in)

Length (in)

Depth (in)

Volume (cuin)

Volume (gal)

No of cmpts

Total vol (gal)

Working vol (75%)

Min Flow Rate (gpm)

W

L

D

W x L x D = Vc

Vc / 231 = Vg

#C

Vg x #C = Vtg

Vtg x 0.75 = Vw

Vw / 2min = MFR

16.0

19.0

10.5

3192

13.8

1

13.8

10

5

         

2

27.6

21

10

         

3

41.5

31

16

16.0

19.0

13.5

4104

17.8

1

17.8

13

7

         

2

35.5

27

13

         

3

53.3

40

20

16.0

20.0

14.0

4480

19.4

1

19.4

15

7

         

2

38.8

29

15

         

3

58.2

44

22

18.0

20.0

14.0

5040

21.8

1

21.8

16

8

         

2

43.6

33

16

         

3

65.5

49

25

18.0

24.0

12.0

5184

22.4

1

22.4

17

8

         

2

44.9

34

17

         

3

67.3

50

25

20.0

20.0

16.0

6400

27.7

1

27.7

21

10

         

2

55.4

42

21

         

3

83.1

62

31

22.0

24.0

16.0

8448

36.6

1

36.6

27

14

         

2

73.1

55

27

         

3

109.7

82

41

24.0

24.0

16.0

9216

39.9

1

39.9

30

15

         

2

79.8

60

30

         

3

119.7

90

45”

13 DE Reg. 1276 (04/01/10)

14 DE Reg. 26 (07/01/10) (Final)