ISO/DIS 6182-13

Fire protection -- Automatic sprinkler systems

Protection contre l'incendie -- Systèmes d'extinction automatiques de type sprinkler

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD ISO/DIS 6182-13
ISO/TC 21/SC 5 Secretariat: ANSI
Voting begins on: Voting terminates on:
2004-07-29 2004-12-29

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

Fire protection — Automatic sprinklers —
Part 13:
Requirements and test methods for extended coverage
sprinklers

Protection contre l'incendie — Systèmes d'extinction automatiques du type sprinkler —

Partie 13: Prescriptions et méthodes d'essai des sprinklers couvrant une surface plus étendue que la normale

ICS 13.220.20

In accordance with the provisions of Council Resolution 15/1993 this document is circulated in

the English language only.

Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué

en version anglaise seulement.

To expedite distribution, this document is circulated as received from the committee secretariat.

ISO Central Secretariat work of editing and text composition will be undertaken at publication

stage.

Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du

secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au

Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE

REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.

IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT

INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO

WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2004
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ISO/DIS 6182-13
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ISO/DIS 6182-13
Contents Page

Foreword .........................................................................................................................................................iv

Introduction.....................................................................................................................................................vi

1 Scope...................................................................................................................................................1

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ISO/DIS 6182-13
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 6182-13 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting,

Subcommittee SC 5, Sprinkler and water spray extinguishing systems.

This second/third/... edition cancels and replaces the first/second/... edition (), [clause(s) / subclause(s) /

table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.

ISO 6182 consists of the following parts, under the general title Fire protection — Automatic sprinklers:

— Part 1: Requirements and test methods for sprinklers

— Part 2: Requirements and test methods for wet alarm valves, retard chambers and water motor

alarms
— Part 3: Requirements and test methods for dry pipe valves
— Part 4: Requirements and test methods for quick-opening devices
— Part 5: Requirements and test methods for deluge valves
— Part 6: Requirements and test methods for check valves

— Part 7: Requirements and test methods for early suppression fast response (ESFR) sprinklers

— Part 8: Requirements and test methods for pre-action dry alarm valves
— Part 9: Requirements and test methods for water mist nozzles
— Part 10: Requirements and test methods for domestic sprinklers
— Part 11: Requirements and test methods for pipe hangers

— Part 12: Requirements and test methods for couplings for grooved end components for

steel pipe systems
— Part 13: Requirements and test methods for extended coverage sprinklers
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ISO/DIS 6182-13

All pressure data in this ISO Standard are given as gauge pressure in bar (1 bar = 0,1 MPa).

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DRAFT INTERNATIONAL STANDARD ISO/DIS 6182-13
Fire protection — Automatic sprinklers —
Part 13:
Requirements and test methods for extended coverage
sprinklers
1 Scope

1.1 This part of ISO 6182 specifies performance requirements, test methods and marking requirements for

extended coverage spray sprinklers.

1.2 These sprinklers are intended to provide control of fires in occupancies or portions of occupancies where

quantity and/or combustibility of contents is low such as in hotel rooms. Requirements and test methods for

extended coverage sprinklers for other occupancy hazards are in preparation.
2 References

The following standards contain provisions which, though referenced in this text, constitute provisions of this

part of ISO 6182. At the time of publication, the editions indicated were valid. All standards are subject to

revision, and parties to agreements based on this part of ISO 6182 are encouraged to investigate the

possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO

maintain registers of currently valid International Standards.

ISO 7-1:1982, Pipe threads where pressure-tight joints are made on the threads, Part 1: Designation,

Dimension and Tolerances
ISO 49:1983, Malleable cast iron fittings threaded to ISO 7-1
ISO 65:1981, Carbon steel tubes suitable for screwing in accordance with ISO 7-1
3 Definitions
3.1 General

3.1.1 Assembly load: The force exerted on the sprinkler body at 0 bar hydraulic pressure at the inlet.

3.1.2 Conductivity factor: A measure of the conductance between the sprinkler's heat responsive

0,5
element and the fitting expressed in units of (m/s) .

3.1.3 Design load: The force exerted on the release element at the service load of the sprinkler.

3.1.4 Extended coverage sprinkler: A sprinkler having a specified area of coverage which is larger than

that of a conventional, spray, flat spray or sidewall sprinkler.
0,5

3.1.5 Response time index: A measure of sprinkler sensitivity expressed as RTI = tu , where t is the

time constant of the heat responsive element in units of seconds, and u is the gas velocity expressed in

meters per second. RTI can be used in combination with the conductivity factor (C) to predict the response of

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ISO/DIS 6182-13

a sprinkler in fire environments defined in terms of gas temperature and velocity versus time. RTI has units of

0,5
(m-s) .

3.1.6 Service load: The combined force exerted on the sprinkler body by the assembly load of the

sprinkler and equivalent force of a 12 bar (1,2 MPa) hydraulic pressure at the inlet.

3.1.7 Sprinkler: A thermosensitive device designed to react at a predetermined temperature by

automatically releasing a stream of water and distributing it in a specified pattern and quantity over a

designated area.

3.1.8 Standard orientation: In the case of symmetrical heat responsive elements, standard orientation is

with the air flow perpendicular to both the axis of the waterway and the plane of the frame arms. In the case

of non-symmetrical heat responsive elements, standard orientation is with the air flow perpendicular to both

the waterway axis and the plane of the frame arms which produces the shortest response time.

3.1.9 Worst case (response) orientation: The orientation which produces the longest response time with

the axis of the sprinkler inlet perpendicular to the air flow.
3.2 Type of sprinklers according to type of heat responsive element.

3.2.1 Fusible element sprinkler: A sprinkler that opens under the influence of heat by the melting of a

component.

3.2.2 Glass bulb sprinkler: A sprinkler that opens under the influence of heat by the bursting of the glass

bulb through pressure resulting from expansion of the fluid enclosed therein.
3.3 Types of extended coverage sprinklers

3.3.1 Pendent extended coverage sprinkler: An extended coverage sprinkler that is arranged in such a

way that the water stream is directed initially downwards against the distribution plate. This sprinkler has a

square area of coverage not exceeding 36 m with sprinkler spacings in 0,5 m increments. The maximum

spacing between sprinklers is 6,0 m.

3.3.2 Sidewall extended coverage sprinkler: An extended coverage sprinkler giving a one-sided

(half-paraboloid) water distribution over a definite protection area. The axis of the sprinkler waterway may be

either horizontal or vertical. This sprinkler has an area of coverage not exceeding 36 m , with sprinkler

spacings in 0,5 m increments, with no dimension exceeding 7 m.

3.3.3 Upright extended coverage sprinkler: An extended coverage sprinkler that is arranged in such a

way that the water stream is directed initially upwards against the distribution plate. This sprinkler has a

square area of coverage not exceeding 36 m with sprinkler spacings in 0,5 m increments. The maximum

spacing between sprinklers is 6,0 m.
3.4 Special types of extended coverage sprinklers

3.4.1 Concealed extended coverage sprinkler: An extended coverage sprinkler fitted with a ceiling

cover plate with the sprinkler body and heat responsive element located above the plane of the ceiling.

3.4.2 Dry extended coverage sprinkler: A unit comprising an extended coverage sprinkler mounted at

the outlet of a special riser extension with a seal at the inlet end, which prevents water from entering the riser

until it is released by operation of the sprinkler.

3.4.3 Flush extended coverage sprinkler: An extended coverage sprinkler of which all or part of the

body, including the shank thread, is mounted above the lower plane of the ceiling, but part of, or all of, the

heat responsive element is below the lower plane of the ceiling.
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3.4.4 Recessed extended coverage sprinkler: An extended coverage sprinkler of which all or part of the

body, other than the shank thread, is mounted within a recessed housing.

3.4.5 Coated extended coverage sprinkler: An extended coverage sprinkler which has a factory applied

coating for corrosion protection.
4 Product consistency

It shall be the responsibility of the manufacturer to implement a quality control programme to ensure that

production continuously meets the requirements of this part of IS0 6182 in the same manner as the originally

tested samples.

Every manufactured sprinkler shall pass a leak resistance test equivalent to a hydrostatic pressure of at least

30 bar (3,0 MPa) for at least 2 seconds.
5 Product assembly

5.1 All extended coverage sprinklers shall be designed and manufactured in such a way that they cannot be

readily adjusted, dismantled or reassembled.

5.2 An extended coverage sprinkler shall be constructed to effect closure of its water seat for extended

periods of time without leakage and to open as intended and release all parts from 0,34 bar (0,034 MPa) up to

the rated working pressure. The closure of the water seat shall not be achieved by the use of a dynamic o-

ring or similar seal (an o-ring or similar seal that moves during operation or is in contact with a component that

moves during operation.
6 Requirements
6.1 General
Sprinklers shall comply with the requirements given in table 1.
Nominal flow constant, K Nominal thread size
0,5
(l/min/bar )
(inches)
(see 6.4.1)
80 ± 4 1/2
115 ± 6 3/4
160 ± 8 3/4
200 ± 10 3/4
Note: In some countries, the use of 1/2 inch threads for sprinklers having
0,5
nominal flow constants up to 160 l/min/bar is acceptable.
Table 1 — Dimensional requirements

6.1.1 All sprinklers shall be constructed so that a sphere of diameter 8 mm can pass through each water

passage in the sprinkler.

6.1.2 Nominal thread sizes should be suitable for fittings threaded in accordance with ISO 7-1.

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ISO/DIS 6182-13

6.1.2.1 In some countries, the use of 1/2 inch threads for sprinklers having nominal flow constants up to 160

0,5
l/min/bar is acceptable.
6.1.2.2 Special sprinklers may have larger thread sizes.

6.1.2.3 The dimensions of all threaded connections should conform to International Standards where applied.

National Standards may be used if International Standards are not applicable.
6.2 Nominal operating temperatures (see 7.6)

The nominal operating temperature of sprinklers shall be as indicated in table 2. The nominal operating

temperatures of all other sprinklers shall be specified in advance by the manufacturer and verified in

accordance with 6.3. They shall be determined as a result of the operating temperature test (see 7.6.1).

Nominal operating temperatures shall be within the ranges specified in table 2.

The nominal operating temperature that is to be marked on the sprinkler shall be that determined when the

sprinkler is tested in accordance with 7.6.1, taking into account the specifications of 6.3.

Values in degrees Celsius
1 2
GLASS BULB SPRINKLERS
Nominal Liqud Color
Operating code
Temperature
57 Orange
68 Red
79 yellow
93 green
107 green
121 blue
141 blue
163 mauve
182 mauve
204 black
227 black
260 black
343 black
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3 4
FUSIBLE ELEMENT SPRINKLERS
Nominal Yoke arm
Operating color code
Temperature
57 to 77 uncolored
80 to 107 white
121 to 149 blue
163 to 191 red
204 to 246 green
260 to 302 orange
320 to 343 orange
Table 2 — Nominal operating temperature
6.3 Operating temperatures (see 7.6.1)
6.3.1 Extended coverage sprinklers, shall open within a temperature range of
X ± (0,035 X + 0,62) C
where X is the nominal operating temperature.
6.4 Water flow and distribution
6.4.1 Flow constant (see 7.10)
The flow constant, K, for sprinklers is given by the formula:
K = Q
0,5
P
where
P is the pressure in bars;
Q is the flow rate in liters per minute;

K-factor for the sprinklers defined in table 1 shall have the values given in table 1 when determined by the

test method of 7.10.
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6.4.2 Water distribution (see 7.11)

6.4.2.1 To demonstrate the required coverage of the protected area allotted to it, the sprinkler shall pass the

tests specified in 7.11.

6.4.2.2 Upright and pendent sprinklers shall be evaluated using one quadrant of the room as shown in figures

5 through 8. Sidewall sprinkler distributions shall be measured utilizing one half of the floor area as shown in

figures 9 through 14. In all cases, a space of 25 mm shall be maintained between all walls and pans.

6.4.2.3 Not more than one pan shall have a collection less than 0,6 mm/minute and it shall not have less than

0,2 mm/minute.

6.4.2.4 The average collection of all the distribution pans for each test shall be a minimum of 1,6 mm/minute.

6.4.2.5 Sprinklers must meet all criteria when tested to the parameters shown in tables 3 and 4. Pendent or

upright sprinklers shall meet all criteria as shown in table 3. Sidewall sprinklers shall meet all criteria as

shown in table 4.

6.4.2.6 Coated sprinklers shall be subjected to additional distribution tests if the coating is observed to deform

or deteriorate during the dynamic heating test of 6.15.
Nominal Flow Nominal Room Deflector to Nominal Flow Rate
Constant, K Dimensions Ceiling Distance
0,5
(l/m/[bar] ) [width x length] (mm)
(l/min)
(m x m)
80 5,0 x 5,0 100 101,8
80 5,5 x 5,5 100 123,2
80 6,0 x 6,0 100 146,6
115 5,0 x 5,0 100 101,8
115 5,5 x 5,5 100 123,2
115 6,0 x 6,0 100 146,6
160 5,0 x 5,0 100 111,1
160 5,5 x 5,5 100 123,2
160 6,0 x 6,0 100 146,6
200 5,0 x 5,0 100 138,9
200 5,5 x 5,5 100 138,9
200 6,0 x 6,0 100 146,6
Table 3 — Distribution testing parameters for upright and pendent sprinklers
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Nominal Flow Nominal Room Deflector to Nominal Flow Rate
Constant, K Dimensions Ceiling Distance
0,5
(l/m/[bar] ) [width x length] (mm)
(l/min)
(m x m)
80 5,0 x 5,0 100 101,8
80 5,0 x 5,0 300 101,8
80 5,0 x 5,5 100 112,0
80 5,0 x 5,5 300 112,0
80 5,0 x 6,0 100 122,2
80 5,0 x 6,0 300 122,2
115 5,0 x 5,0 100 127,3
115 5,0 x 5,0 300 127,3
115 5,0 x 5,5 100 140,0
115 5,0 x 5,5 300 140,0
115 5,0 x 6,0 100 152,7
115 5,0 x 6,0 300 152,7
115 5,0 x 6,5 100 165,4
115 5,0 x 6,5 300 165,4
115 5,0 x 7,0 100 178,2
115 5,0 x 7,0 300 178,2
160 In Preparation In Preparation In Preparation
200 In Preparation In Preparation In Preparation
Table 4 - Distribution testing parameters for sidewall sprinklers
6.5 Function (see 7.5)

6.5.1 When tested in accordance with 7.5.1 to 7.5.4, the sprinkler shall open and, within 5 s after the release

of the heat responsive element, shall operate satisfactorily by complying with the requirements of 6.4.1. Any

lodgement of released parts shall be cleared within 10 s or the sprinkler shall then comply with the

requirement of 6.4.2. No lodgements are permitted in the 80 sprinklers tested. Lodgement is considered to

have occurred when one or more of the released parts lodge in the deflector frame assembly in such a way as

to cause failure to meet the water distribution requirement of 6.4.2 after 10 s.

6.5.2 The deflector and its supporting parts shall not sustain significant damage as a result of the functional

test specified in 7.5.4 and shall meet the requirements of 6.4.2.

6.5.3 In most instances, visual examination of the sprinkler will be sufficient to establish conformity with the

requirements of 6.5.1 and 6.5.2.
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6.6 Strength of sprinkler body (see 7.3)

The sprinkler body shall not show permanent elongation of more than 0,2% between the load-bearing points

of the sprinkler body after being subjected to twice the service load as measured in 7.3.

The manufacturer shall specify the average and upper limit of the service load.
6.7 Strength of release element (see 7.9)
6.7.1 When tested in accordance with 7.9.1 glass bulb elements shall
a) have an average strength of at least six times the average service; load; and

b) have a design strength lower tolerance limit (LTL) on the strength distribution curve of at least two times

the upper tolerance limit (UTL) of the service load distribution curve based on calculations with a degree

of confidence (y) of 0,99 for 99 percent of samples (P). Calculations will be based on Normal or Gaussian

Distribution except where other distribution can be shown to be more applicable due to manufacturing of

design factors. See Figure 21.

6.7.2 Fusible heat-responsive elements in the ordinary temperature range shall be designed to

a) sustain a load of 15 times its design load corresponding to the maximum service load measured in 7.3;

for a period of 100h when tested in accordance with 7.9.2.1; or

b) demonstrate the ability to sustain the design load when tested in accordance with 7.9.2.2.

6.8 Leak and hydrostatic strength (see 7.4.1)

6.8.1 A sprinkler shall not show any sign of leakage when tested by the method specified in 7.4.1.

6.8.2 A sprinkler shall not rupture, operate or release any parts when tested by the method specified in 7.4.2.

6.9 Heat exposure (see 7.7)

6.9.1 Glass bulb sprinklers There shall be no damage to the glass bulb element when the sprinkler is tested

by the method specified in 7.7.1.

6.9.2 Uncoated sprinklers Sprinklers shall withstand exposure to increased ambient temperature without

evidence of weakness or failure, when tested by the method specified in 7.7.2.

6.9.3 Coated sprinklers In addition to meeting the requirement of 6.10.2 in an uncoated version, coated

sprinklers shall withstand exposure to increased ambient temperatures without evidence of weakness or

failure of the coating, when tested by the method specified in 7.7.3.
6.10 Thermal shock (see 7.8)

Glass bulb sprinklers shall not be damaged when tested by the method specified in 7.8. Proper operation

shall not be considered damage.
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6.11 Corrosion (see 7.12)

6.11.1 Stress corrosion (see 7.12.1) When tested in accordance with 7.12.1, each sprinkler shall show no

cracks, delaminations or failures which could affect its ability to satisfy other requirements.

6.11.2 Sulfur dioxide corrosion (See 7.12.2) Coated and uncoated sprinklers shall be resistant to sulfur

dioxide saturated with water vapor when conditioned in accordance with 7.12.2. Following exposure, the

sprinklers shall be functionally tested at 0,35 bar (0,035 MPa) only in accordance with 6.5.1 and meet the

dynamic heating requirements of 6.15.2.

6.11.3 Salt spray corrosion (see 7.12.3) Coated and uncoated sprinklers shall be resistant to salt spray

when conditioned in accordance with 7.12.3. Following exposure, the sprinklers shall be functionally tested at

0,35 bar (0,035 MPa) only in accordance with 6.5.1 and meet the dynamic heating requirements of 6.15.2.

6.11.4 Moist air exposure (see 7.12.4) Sprinklers shall be resistant to moist air exposure when tested in

accordance with 7.12.4. Following exposure, the sprinklers shall be functionally tested at 0,35 bar (0,035

MPa) only in accordance with 6.5.1 and meet the dynamic heating requirements of 6.15.2.

6.12 Coated sprinklers (see 7.13)

6.12.1 Evaporation of wax and bitumen (see 7.13.1) Waxes and bitumens used for coating sprinklers shall

not contain volatile matter in sufficient quantities to cause shrinkage, hardening, cracking or flaking of the

applied coating. The loss in mass shall not exceed 5% of that of the original sample when tested by the

method in 7.13.1.

6.12.2 Resistance to low temperatures (see 7.13.2) All coatings used for sprinklers shall not crack or flake

when subjected to low temperatures by the method in 7.13.2.

6.12.3 Resistance to high temperature Coated sprinklers shall meet the requirements of 6.10.3.

6.13 Water hammer (see 7.15)

Sprinklers shall not leak when subjected to pressure surges from 4 bar to 34 bar (0,4 to 3,4 MPa). They shall

show no signs of mechanical damage when tested in accordance with 7.15 and shall operate when

functionally tested to the requirements of 6.14.1.
6.14 Dynamic heating (see 7.6.2)

6.14.1 Extended coverage sprinklers shall meet the RTI and C limits for fast response sensitivity sprinklers as

shown in figure 1 when tested in the standard orientation. For concealed, flush, and recessed sprinklers see

1/2 0,5

6.22. Sprinklers with C values below 0,5 (m/s) should be evaluated using C equal to 0,5 (m/s) . All RTI

values shall be calculated as in 7.6.2.3.

6.14.2 Extended coverage sprinklers, when tested in the worst case orientation, shall have RTI values not

0,5

exceeding 125 (m-s) or 250 percent of the average RTI in the standard orientation.

6.14.3 After exposure to the corrosion test described in 6.12.2, 6.12.3, and 6.12.4 sprinklers shall be tested in

the standard orientation as described in 7.6.2.1 to determine the post-exposure RTI. Each post-exposure RTI

value shall not exceed the limits shown in figure 1. In addition, the average RTI value shall not exceed 130%

of the pre-exposure average value. All post-exposure RTI values shall be calculated as in 7.6.2.3 using the

pre-exposure conductivity factor (C).
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6.15 Resistance to heat (see 7.14)

Open sprinklers shall be resistant to high temperatures when tested in accordance with 7.14. After exposure,

the sprinkler shall not show visual deformation or breakage.
6.16 Resistance to vibration (see 7.16)

Sprinklers shall be able to withstand the effects of vibration without deterioration when tested in accordance

with 7.16. After the vibration test of 7.16, sprinklers shall show no visible deterioration and shall meet the leak

resistance requirement of 6.8 and the functional test requirement of 6.5.1, at 0,35 Bar (0,035 MPa) only.

Test Gas Gas Applied
Condition Temperature Velocity Vacuum
Number ( C) (m/s) (mm Hg)
1 128 1,0 0,007
2 128 2,6 0,007
3 128 3,5 0,007
4 197 1,0 0,010
5 197 2,6 0,010
6 197 3,5 0,010
7 290 1,0 0,013
8 290 2,6 0,013
9 290 3,5 0,013
Table 5 - Plunge tunnel conditions for concealed, flush, and
recessed extended coverage sprinklers
Test Upright or Pendent Sidewall
Condition Maximum Operating Maximum Operating
Number Time Time
(sec) (sec)
1 34 44
2 19 24
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3 16 20
4 16 20
5 10 12
6 7 10
7 --- ---
8 --- ---
9 --- ---
Table 6 - Maximum operating times for fast response concealed, flush,
and recessed extended coverage sprinklers
6.17 Resistance to impact (see 7.17)

Extended coverage sprinklers shall have adequate strength to withstand impacts associated with handling,

transport and installation without deterioration of performance or reliability. These sprinklers shall show no

fracture or deformation, shall meet the leak resistance requirement of 6.8 and the functional test requirement

of 6.5.1, at 0,35 Bar (0,035 MPa) only, after the impact test of 7.17.
6.18 Lateral discharge (see 7.18)

Extended coverage sprinklers shall not prevent the operation of adjacent sprinklers when tested in accordance

with 7.18.
6.19 30 day leakage resistance (see 7.19)

Sprinklers shall not leak, sustain distortion or other mechanical damage when subjected to 20 bar (2 MPa)

water pressure for 30 days. Following completion of this 30 day test, all samples shall meet the leak

resistance requirements specified in 6.8. Examine all samples to verify that there is no evidence of distortion

or other mechanical damage.
6.20 Vacuum resistance (see 7.20)
Sprinklers shall not exhibit distortion, mechanical damage or lea
...