DEFSTAN 23-8/1(1997) : 1997

Section One General
0 Introduction
1 Scope
2 WARNING
3 Related documents
4 Definitions
Section Two Environmental and Operational
      Requirements
5 General
6 Human factors
Section Three Technical Requirements
7 Military fuels
8 Fuel systems
9 Standard military lubricants, hydraulic
      fluids and antifreeze
10 Main engine
11 Breaking systems
12 Electrical and Electronic systems
13 Batteries
14 Slave starting
15 Protection
16 Cabs, bodies and chassis
17 Mobility
18 Vehicle cab heating/demisting
19 Auxiliary equipment
20 Maintenance and servicing
21 Waterproofing considerations
Section Four Test and evaluation
23 General
24 Test Schedule
Table A Relative capacity of lead-acid storage
      batteries at normal and low temperatures
Table B Insulating materials and adhesives-examples
Table C Wind chill factors
Figure 1 Battery -300 Amp discharges at 27degreesC,
      -18degreeC and -40degreesC (Fully charged)
Figure 2 Battery - 300 Amp discharges at 27degreesC,
       -18degreesC and -40degreesC (3/4 charged SG 1.250)
Figure 3 Battery - 300 Amp discharges at 27degreesC,
       -18degreesC (1/2 charged SG 1.250)
Figure 4 Battery - 300 Amp discharges at 27degreesC,
       -18degreesC (1/4 charged SG 1.160)
Figure 5 Freezing point curve for electrolyte and
       solutions - Sulphuric acid
Figure 6 Cooling curves at various battery ambient
       temperatures
Annex A Heater unit-design calculations
Annex B Installation of batteries for sub-zero and
       tropical environments
Annex C Insulating materials and adhesives
Annex D Thermal conductivity constants

This Defence Standard covers winterization requirements for vehicles which are intended for use in theatres of operation with low ambient temperatures. It specifies the protection requirements which shall be provided to enable reliable starting and operation of the vehicle and the safety of its occupants. Equipment prepared in accordance with this standard shall be capable of being operated and maintained in climates down to -46 deg C, where conditions of ice and snow, combined with adverse windchill are inhibiting factors.