BS ISO 20766-25-2022 pdf free download.Road vehicles — Liquefied petroleum gas (LPG) fuel system components Part 25: Gas connections
This document specifies general requirements and definitions of the gas connection component of liquefied petroleum gas fuel, it is intended for use on the types of motor vehicles as defined in ISO 3833.
It also provides general design principles and specifies requirements for instructions and marking.
This document is applicable to vehicles (mono‑fuel, bi‑fuel or dual‑fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.
It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the appropriate functional tests.
All references to pressure in this document are considered gauge pressures unless otherwise specified.
This document applies to devices which have a service pressure in the range of 110 kPa (butane rich at 20 °C) and 840 kPa (propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 20766‑1, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 1: General requirements and definitions
ISO 20766‑2, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 2: Performance and general test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20766‑1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
b) the connection between the gas tube or hose and the filling unit if this connection is fitted with a sleeve which is resistant against LPG and any leaking gas will be discharged directly into
the atmosphere.
6 Tests
6.1 Applicability
The tests required to be carried out are indicated in Table 1.
6.2 Hydrostatic strength
Test the gas connections according to the procedure for testing hydrostatic strength specified in ISO 20766‑2. The test pressure shall be 2,25 times the working pressure.
6.3 Continued operation
Test the gas connections in accordance with the procedure for testing continued operation given in ISO 20766‑2 for a total of 100 000 cycles.
6.4 Pull-off
Test the gas tube and gas connections according to the following procedure and acceptance criteria.
Secure the subject specimen in an appropriate test fixture, then statically apply a tensile load along the gas tube axis at a maximum rate of 250 N/min until the gas tube separates from the connections.
The force (F), in newtons, required to pull apart the gas tube from its connections shall be calculated as: F = (π × d 2 × P)/10
where
d is the internal diameter, in millimetres;
P is the maximum working pressure, in MPa (bar).BS ISO 20766-25 pdf download.