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Piping & Fittings
| There are variety of piping and fitting systems commonly available
for use in passenger transit rail vehicles. Each of these types has advantages
and disadvantages.
Copper tubing with sweated copper fittings used in a pneumatic system,
is a low-cost alternative, but if not properly flushed after assembly,
the residue from the sweating/soldering activity will cause corrosion
problems within the pneumatic system.
Stainless steel tubing is suitable for both hydraulic and pneumatic
systems. Stainless steel tubing, when used with stainless steel fittings,
or forged steel fittings electroplated to ASTM B 633, Type II yellow,
will provide a reliable and durable, piping system.
Zinc plated steel piping is frequently used in railroad applications,
and is quite durable and relatively low-cost. Steel piping and fittings,
however, are relatively heavy as compared with tubing systems, and may
not be suitable for weight conscious passenger rail transit vehicles.
All piping systems, either a pneumatic or hydraulic, should
be completely flushed with a liquid cleansing solution to remove
all impurities, and purged with dry air at a low velocity until
thoroughly dry, prior to closing the system and putting into service.
The flushing procedure is especially important for piping systems
joined with soldered connections. |
| Standard: |
ASME B31.1 - Power Piping
| | Purpose: |
This code prescribes minimum requirements for the design, materials,
fabrication, erection, test, and inspection of power and auxiliary
service piping systems for electric generation stations, industrial
institutional plants, central and district heating plants. The code
covers boiler external piping for power boilers and high temperature,
high pressure water boilers in which steam or vapor is generated at
a pressure of more than 15 psig; and high temperature water is generated
at pressures exceeding 160 psig and/or temperatures exceeding 250°F.
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| Criteria: |
Specify standard name
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| Usage: |
... piping, tubing, valves, fittings, installation and testing
methods, shall comply with ASME B31.1
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| Standard: |
ASTM A53 - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
| | Purpose: |
This specification covers seamless and welded black and
hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26. The
standard requires specific metallurgical requirements and
a seamless or welding process. This piping is normally suitable
for air brake applications. Various Types are listed (Type
E, Type F, Type S) each with specific criteria, grade, and
applications. The user should specify which type is applicable.
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| Criteria: |
Specify compliance with standard
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| Usage: |
... shall meet the requirements of ASTM A53, Type X, Grade X
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| Standard: |
ASTM A269 - Standard Specification
for Seamless and Welded Austenitic Stainless Steel Tubing for General
Service
| | Purpose: |
This specification covers grades of nominal-wall-thickness, stainless
steel tubing for general corrosion-resisting and low- or high-temperature
service. The tubing sizes and thickness' usually furnished to this
specification are 1/4 in. (6.4 mm) in inside diameter and larger and
0.020 in. (0.51 mm) in nominal wall-thickness and heavier.
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| Criteria: |
Specify standard name, and grade
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| Usage: |
ASTM A269, Grade 316L
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| Standard: |
ASTM B88 - Standard Specification
for Seamless Copper Water Tube
| | Purpose: |
This specification covers Copper UNS No. C12200 seamless
copper water tube suitable for general plumbing, similar
applications for the conveyance of fluids, and commonly
used with solder, flared, or compression-type fittings.
The type of copper water tube suitable for any particular
application is determined by the internal or external fluid
pressure, by the installation and service conditions, and
by local requirements. (Suitable for pneumatic systems),
Types K, L, and M provide different wall thickness ranges,
K is the thickest wall per tubing size.
ASTM B280 - refrigeration grade tubing is similar, but held
to higher cleaning standards. |
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| Criteria: |
Specify standard name, and type
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| Usage: |
ASTM B88, Type XX
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| Standard: |
ASTM A672 - Standard Specification
for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at
Moderate Temperatures
| | Purpose: |
This specification covers steel pipe: electric-fusion-welded with
filler metal added, fabricated from pressure-vessel quality plate
of any of several analyses and strength levels and suitable for high-pressure
service at moderate temperatures.
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| Criteria: |
Specify standard name, and grade (material and strength), and
class (heat treatment)
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| Usage: |
ASTM A672, Grade A55, Class 30
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| Standard: |
IEC 61133 - Electric Traction
Rolling Stock Test Methods for Electric and Thermal/Electric
Rolling Stock on Completion of Construction and Before Entry
Into Service (AKA IEC 1133) |
| Purpose: |
This specification provides a variety of test procedures
and test criteria for electric and thermal electric passenger
transit rail vehicles. This standard provides test procedures
for the pneumatic system air tightness test that is applicable
to pneumatic friction brake systems. Standard loss rate
is 0.2 bar @ 5 minutes |
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| Criteria: |
Specify standard name, and maximum loss rate (optional)
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| Usage: |
Shall be tested according to IEC 61133, pressure shall not fall
by more than 0.2bar at xx minutes
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