1 9 8 3 Fall M e e t i n g

T e c h n i c a l C o m rn i t t e e D o c , u m e n t a t i o n

/

TCD-83-F

A Compilation of the Documented Action on Comments Received by the Technical Committees Whose Reports Have Been Published

Prior to Consideration at the NFPA Fall Meeting

Orlando Hyatt Orlando, FL

November 14-17, 1983

I Please Bring to the Fall Meeting

NFPA

Copyright© 1983 All Rights Reserved

National Fire Protection Association, Inc. Batterymarch Park, Quincy, MA 02269

1 1 M - 9 - 8 3 - S M P r i n t e d in U,S.A.

SUPPLEMENTARY

Report of Committee on Rural Fire Protection

James W. Simms, Chairman Rolf Jensen& Assoc., Inc.

Donald J. McCarrick, Vice Chairman Mutual Service Off ice

Louis A. Witzeman, Secretary Scottsdale Fire Dept.

A. R. Antonio, Bancroft Fire Protection D is t r i c t Junius O. Baker, J r . , USDA - Forest Service Laura B. Buchbinder, US Fire Ad~nis t ra t ion R. C. Callahan, Fire Mutual Aid System William J. Fletcher, Nat ' l Safety Council Selby C. Jacobs, Manassas, VA Paul G, Mason, M ~ M Protection Consultants Robert G. Mauney, Maricopa County Government William F. McQuaid, Mutual Fire Insurance Assn. of NE Jeanne Pr iester, US Dept. of Agriculture Joe L. Rape, Germantown, TN

Rep. l n t ' l Assn. of Fire Chiefs Alan Saulsbury, Saulsbury Fire Equipment Corp.

This l i s t represents the membership at the time the Committee was balloted on the text of this edit ion. Since that time, changes in the membership may have occurred.

The Committee on Rural Fire Protection proposes for adoption this Supplementary Report which documents i ts action on the public comments received on the proposed revision to NFPA 1231-1975, Standard on Water Supplies fo r Suburban and Rural Fire Fighting, published in the Technical Committee Reports for the 1983 Fall Meeting.

This Supplementary Report has been submitted to l e t t e r ba l lo t of the Technical Committee on Rural Fire Protection which consists of 15 voting men~)ers; of whom 10 voted a f f i rmat i ve ly , and 3 bal lots were not returned (Messrs. Antonio, Mauney and Ms. Buchbfnder) and 2 requested to be recorded as not voting (W. J. Fletcher and J. Pr ies ter } .

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1231- 1 - (Table D-1.3B): Accept SUBMII-FER: Richard E. Hughey, ISO Commercial Risk Services, Inc. ~ N PROPOSAL NO.: 1231-1 RECOMMENDATION: Revise Table D-I.3B to indicate more appropriate f r i c t ion loss values in the 250 through 750 gpm lines.

(Unless there is a lay-out error in setting up this table.) SUBSTANTIATION: The f r i c t i on loss values shown do not match those determined from the Hazen-Williams formula in the range from 250 gpm to 750 gpm. Movemeqt of all f r i c t ion loss data one column rightward in these flow lines would appear to provide resaonable values. COMMITTEE ACTION: Accept. COMMITTEE COMMENT: The Table as printed in the TCR was misprinted and should be as follows:

Approximate Frict ion Losses in Fire Hose (psi per i00 feet)

Internal diameter of hose: ? I /2 3 3 1/2 4 5 6

Flow in GPM:

250 15 6 2 500 35 25 10 5 2 750 45 20 11 4 1.5 1000 77 36 19 6 2.5 1500 82 40 14 6 2000 70 25 10

1231- 2 - (E-1.1 through E-I-2.1(c)) : Accept in Principle SUBMITFER: Richard E. Hughey, ISO Comercial Risk Services, Inc. ~OMMENT ON PROPOSAL NO.:: 1231-1 HE~UMMENOATIOH: {a) Add to Paragraph E- I - I .1 a statement that the portable pump selection should f i t the f i re f ight ing system of which i t is to be a component; i f direct hose streams are to be taken from a portable pump, the nozzles and hose size determine the required pump discharge vs. pressure characteristics.

(b) Revise next-to- last sentence of Paragraph E-1-2.1(b) to ref lect the f r i c t ion loss, nozzle pressure requirements in combination with the limited pump characteristic. Suggested:

"This class of pump has limited u t i l i t y for small structural f i res and can supply a 60 gpm fog nozzle via up to 250 f t of 1 3/4-inch lined hose, at somewhat reduced nozzle pressure and f low."

(c) Revise Paragraph E-1.2.1(c) to ref lect similar, but more pronounced l imitations• Suggested:

" . . . . where water has ~cumulated. I t can also be pressed to serve two 1 1/2-inch or 1 3/4-inch hose lines of short length with 60 gpm fog nozzles, albiet with noticeably reduced f i re stream qual i ty and quantity. Results may not provide suitable protection for inter ior f i re f ight ing." SUBSTANTIATION: Fog nozzles require nozzle pressures in the v i c i n i t y of 100 psi to produce rated flow and good stream qual i ty. Characteristic f r i c t i on loss of Q 121/2-inch Fire Department hose may be represented as "25 " in terms of psi loss per 100 f t of hose, where "Q" represents GPM in hundreds (a standard convention). Frict ion loss in 1 3/4-inch is approximately half that for 11/2- inch, and for 2-inch reduced by half again. Given a draft situation (discharge pressure as much as 4 to 6 psi less than rated net pressure) and normal pump performance deterioration with age, the medium volume pump would be expected to provide less than 75 psi nozzle pressure with 250 f t of typical 1 1/2-inch lined f i re hose. Nozzle pressures of less than 80 psi from my experience, produce v is ib ly poorer stream qual i ty (less volume, larger droplet size, less reach)•

The large volume-low pressure portable pump has received a great deal of misapplication; witness the use of these to supply 1 1/2-inch preconnects and booster reels on loca l ly -bu i l t "mini-pu~ers". Although these low head pumps are j us t i f i ab l y pressed into service for handlines when more appropriate pumps are not avail able (e.g., a f i re at a lake-side camp which is accessible only by boat or snowmobile), their l imitations under such circumstances, in terms of stream effectiveness and protection of the nozzle crew, should be en~phasized. COMMIT'FEE ACTION: Accept in Principle• COMMITTEE COMMENT: A. ,~dd to Section E-1.1.1 the following:

"Portable pump selection should f i t the f i re f ight ing system of which i t is to be a component; i f direct hose streams are to be taken from a portable pump, the nozzles and hose size determine the required pump discha;-ge vs. pressure characteristics."

B • Revise the next to the last sentence in Section E-1.2.1(b) to read:

"This class of portable pump has limited u t i l i t y for small structural f i res and may supply a 60 GPM fog nozzle through 250 f t of 1 3/4 in. hose."

C. Change the last sB1tence in Section E-1.2.1(c) to read: " I t may be used to supply two 1 1/2 in. or 1 3/4 in. hose lines

of short length with 60 ,ipm fog nozzles. This may result in f i r e streams of reduced qual i ty and quantity and may not be suitable flows for inter ior f i re f ight ing."

1231- 3 - (C-1-10): Reject SUBMITTER: Donald L. Curtis, ISO Commercial Risk Services, Inc. COMMENT ON PROPOSAL NO.: 1231-1 RECOMMENDATION: Formula given to determine maximum continuous flow capabi l i ty should be revised to indicate that the acceleration/deceleration factor is applied twice in a cycle for each tanker.

Suggested: Q = V -10% A + 2 T + B

where all symbols are unchanged "except" T = time. in minutes of "one-way" travel from water source to f i re , given by formula T - 0.65 + XD. SUBSTANTIATION: Formula, as shown in TCR, provide.'; for use of the time-distance formula as i f "T" were a round t r ip time. The formula is intended to have the 0.65 acceleration factor applied once in each stop/start sequence, i .e. twice in each complete tanker cycle• COMMITTEE ACTION: Reject. COMMII[EE COMMENT: The Committee feels that the formula is correct as printed in the TCR.

T=0.65 + XD Where T = Time 0.65 adds more time for slow downs, curves, etc. X = Average safe constant speed D = Round Trio Distance

0.65 is not an acceleration factor Acceleration is accounted for in the formula:

Q = V - 10%

Specif ical ly A&B A = Time in minutes for tanker to drive 200 f t , dump water into a

drop tank and return to starting point. B = Time in minutes for tanker to drive 200 f t , f i l l tanker at

water source and return to start ing point.

L. The formula in 5-2.1.1, 5-2.2.1 and 5-4.2 be rewritten as

follows: TOTAL WATER SUPPLY = Total Cu Ft of Structure X Construction

Occupancy Hazard Classiflca~ion Classif ication No•

Section 5-2.2.1" be changed to the following: "For all structures, other than dwellings covered in 5-2, with

no . . . . II The formula in 5-3.1.1, 5-3.2.1 and 5-4.3 be rewritten as

follows: TOTAL WATER SUPPLY = Total Cu Ft of Structure X Construction

Occupancy Hazard Classif ication Classification No. X 15

Page 475, Section 5-3.1.1", last sentence to read: "Classif ication number determined from Chapter 3 multiplied by

the construction classif icat ion number is determined by Chapter 4." Section 5-3.2.1" be changed to the following: "For all structures other than dwellings covered fn 5-3,

with . . . . " Page 478, Section A-3-1.4(d) needs the word "hazard" added. I t

wi l l then read: "The rural f i re department needs to work with the farmer to

reduce the f i re and l i f e potential hazard of these . . . . . " Page 479, Section A-5-4(e) which now reads "3500 x 1.5 = 5,250

gal" needs to be changed to read: "3429 x 1.5 = 5,144 gal". Page 479, Section A-5-4(e) to read: "Occupancy Hazard Classif ication number 4 (for the barn with no

hay storage). Construction Classif ication number is 1.0

64,000 + 4 x 1.0 = 16000 16,000 x 1.5 (for exposure hazard - the dwelling) = 24,000"

Page 478, change Section A-5-4 to A-5-4.3. Page 485, Section B-8.1, second sentence should read: "The water requirement calculated and the type and amount

. . . . u Page 486, Section C-I-5, l ine up the figures under' t i t l e

"Discharge Time In Minutes" Page 487, Section C-1-10, change "is" to "are" in last sentence

of f i r s t paragraph; at the end of the third paragraph, equation "T = 0.65 + XD" should be dropped down a space and centered; in f i r s t formula, second paragraph, under "T" add "(Se~ table C-I.IOA); at end of fourth paragraph add:

"Using an average safe constant speed of 35 mph X = 60 60 = 1.7~

average safe constant speed ~ h " Page 494, Section E-1-3.B, i t is not prudent to put the

discharge l ine from portable pumps into the tops of booster tanks or tankers unless no other way is possible or a special f i l l i n g device is provided.

Page 488, number "Time Distance Table" as Table C-I-IOA. Page 493, Section E-I-2, delete "(see E-I-2.1)" . Page 494, Section E-1-3.3 change "(see C-1-10)" to "(C-I-13)". Section L-I-3.B change the "(see C-1-10)" to "(C-I-13)". Change "E-1-3.8" to "E-1-3.6". Change "E-I-3.9" to "E-1-3.7". Change "E-I-3.10" to "E-1-3.8".

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The following figures were unavailable for the Technical Committee Report on NFPA 1231.

(Compliments of Georgia Forestry Commission.) Figure C-1-13. A Mobile Water Supply (Tanker) mounted on a truck chassis of the 27/500 GVW range.

Capacity of tank is 1250 gal and can be f i l led from draft in approximately four minutes and discharged in approximately 95 seconds.

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Figure D-1-6(b) Apparatus with reels for large diamter hose,

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Figure D-I-7 Large diameter hose supplying a distr ibut ion valve from which runs two 2 I / 2 - i n . l ines; one'to a hand l ine and the other to supply a pumper.

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