SB-10043825-7835

SERVICE MANUAL BULLETIN
This Service Manual Bulletin is prepared by the Publications Department of New Flyer Industries
Canada ULC. This Service Bulletin supersedes existing information in your New Flyer Service
Manual. Refer to details below.

SMB-115B
ISSUE DATE: Jan 09 2014

APPLICABILITY
VEHICLE LENGTH

† 30ft.

† 35ft.

† 40ft.

† 60ft.

„ ALL

VEHICLE TYPE

† High Floor

„ Low Floor

† Invero

„ Xcelsior

† ALL

† Diesel

† Electric

„ CNG

† LNG

† Diesel/Electric

† Gas/Electric

† Fuel Cell

FUEL TYPE

† ALL

SUBJECT

Pressure Relief Device (PRD) - Torque Requirements
Pressure Regulator - Operating Pressure Range

SECTION TITLE

7 - CNG FUEL SYSTEM

DETAILS

This bulletin identifies the approved torque values for Pressure Relief
Devices (PRD) and provides removal and installation procedures specific to the various PRD configurations.
This bulletin identifies the normal operating pressure ranges for the
Pressure Regulator used on your New Flyer vehicle.
This information supersedes any prior information on this subject
already provided in your New Flyer Manuals. Make this Service Bulletin
available to service personnel to inform them of changed information
and procedures.

SMB-115B

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

1 of 8

SERVICE MANUAL BULLETIN
SMB-115B
REVISION INDEX

Rev

Description of Change

Date

A

Original Issue

Feb 23 2012

B

Included additional PRD part numbers, detailed removal and installation
procedures, and additional torque values for the various PRD configurations

Jan 09 2014

2 of 8

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

SMB-115B

SERVICE MANUAL BULLETIN
SMB-115B
1.

CNG Fuel System

1.1.

Purpose
This bulletin is issued to ensure that all
users are aware of:

1.2.

PRESSURE REGULATOR
SETTING
Regulator P/N

Pressure

❒ Differences in pressure regulator settings
as determined by the specific part number
of the unit

384352

94-120 psi (683-863 kPa)

351934

99-125 psi (683-863 kPa)

❒ Pressure Relief Device (PRD) inspection,
removal, and installation procedures

336193

99-125 psi (683-863 kPa)

❒ Pressure Relief Device (PRD) torque values specific to the part number of the PRD.

264069

99-125 psi (683-863 kPa)

068540

99-125 psi (683-863 kPa)

065243

99-125 psi (683-863 kPa)

043662

120-150 psi (827-1034 kPa)

057608

120-150 psi (827-1034 kPa)

264070

120-150 psi (827-1034 kPa)

Pressure Regulator Setting
Refer to your New Flyer Parts Manual and
confirm Pressure Regulator part number.
Refer to following chart for correct pressure regulator setting:

SMB-115B

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

3 of 8

SERVICE MANUAL BULLETIN
SMB-115B
1.3.

Pressure Relief Device (PRD)

1.3.1.

PRD Inspection

gauge wire minimum to an appropriate
ground source at least 8' (2.44 meters)
in the ground. Rapid discharge can
generate a static electrical charge,
which may be sufficient to ignite the
escaping gas. When venting the
container, it must be in a well-ventilated
area free of ignition and heat sources.
DO NOT vent the container in an area
where the flammable gas may
accumulate and ignite.

Pressure relief devices (PRD) are installed
in the vent lines running from each tank.
Earlier tank versions also included a PRD
installed directly in the tank end. All PRD’s
must be connected in a manner that
ensures that the PRD can vent the contents of the tank regardless of whether the
tank valve is in the closed or open position.
Only quick response PRD’s approved for
use with Lincoln Composites tanks are to
be used with these tanks. Approved
devices are listed in Section 7 of the Parts
Manual for this vehicle. The parts are available from NFIL Parts Division.

2. Leak testing of the interfaces between the
PRD and tank or vent lines. These interfaces should be serviced if any leakage is
observed.
1.3.2.

PRD Removal
The following PRD removal and installation
instructions are written to accommodate
the various configurations used, including:

Pressure relief devices are sensitive to
temperature. DO NOT steam clean the
pressure relief devices. DO NOT expose
them to temperatures which exceed
180°F (82°C)
Inspection of the PRD should include the
following:
1. Examine the PRD assemblies for damage.
The PRD assemblies should not be
deformed or show other signs of damage.
Damaged PRD assemblies must be
replaced.

Before depressurizing the container,
ground the venting orifice with a 3-

4 of 8

❒ PRD’s installed inline and located near the
solenoid end of the tank. See “Fig. 1: Inline
PRD Installation” on page 5. These PRD’s
will be connected with either tee or elbow
fittings.
❒ PRD’s installed inline and located nearest
the opposite end of the tank. These PRD’s
will be connected to the vent lines with
either straight fittings or, on earlier versions, with tee and elbow fittings. See “Fig.
1: Inline PRD Installation” on page 5.
❒ PRD’s installed directly in the threaded
boss of the tank end opposite the solenoid
valve. These PRD’s are connected to the
vent line with an elbow. See “Fig. 2: TankEnd PRD Installation” on page 7.
Use the appropriate removal and installation procedure to suit the PRD configuration being serviced.

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

SMB-115B

SERVICE MANUAL BULLETIN
SMB-115B
1.3.2.1. Removal (PRD with tee/elbow fittings)
1. Defuel tanks. Refer to “Zone Three Venting
Procedure” in your New Flyer Service
Manual for defueling procedure.
2. Remove the PRD located nearest the solenoid valve as follows:
a. Loosen the Swagelok® fittings and disconnect vent lines from PRD inlet tee
fitting and outlet elbow fitting and

remove PRD from vehicle. See “Fig. 1:
Inline PRD Installation” on page 5.
b. Loosen the adjustment nut on the PRD
inlet tee fitting and unthread the tee fitting from the PRD. Discard the O-ring.
c. Loosen the adjustment nut on the PRD
outlet elbow fitting and unthread the
elbow fitting from the PRD. Discard the
O-ring.

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),77,1*
35'

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287/(7
675$,*+7
),77,1*

35'

3/8*
35'
287/(7
7((),77,1*

+,*+35(6685(
9(17/,1(

($5/,(59(56,21
s132501a.svg

Fig. 1: Inline PRD Installation

SMB-115B

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

5 of 8

SERVICE MANUAL BULLETIN
SMB-115B
1.3.2.2. Installation (PRD with tee/elbow
fittings)

4. Ensure the vent tubes are fully inserted
within the Swagelok® fittings, and then
tighten the Swagelok® fittings in accordance with existing instructions in your
New Flyer Service Manual.

Ensure directional arrow stamped on
body of PRD is pointing in direction of
flow, toward vent line outlet.
1. Install the tee fitting into the inlet of the
PRD as follows:
a. Fully retract the adjustment nut on the
tee fitting.
b. Lightly lubricate new O-ring with silicone grease and install against the
backup washer on the tee fitting.
c. Thread the tee fitting into inlet of PRD
until lightly seated.
d. Loosen tee fitting sufficiently to align
parallel with vent lines when installed.
e. Tighten adjustment nut until lightly
seated. Do not final tighten adjustment
nut at this time.
2. Install the elbow fitting into the outlet of the
PRD as follows:
a. Fully retract the adjustment nut on the
elbow fitting.
b. Lightly lubricate new O-ring with silicone grease and install against the
backup washer on the elbow fitting.
c. Thread the elbow fitting into inlet of
PRD until lightly seated.
d. Loosen elbow fitting sufficiently to align
with vent line when installed.
e. Tighten adjustment nut until lightly
seated. Do not final tighten adjustment
nut at this time.
3. Align the fittings on the PRD, with the vent
lines, ensuring the directional arrow on the
PRD body is pointing in the direction of
flow, toward the vent line outlet.

6 of 8

ALWAYS tighten PRD fittings to the
torque value specified for the inlet and
outlet location on the PRD. Torque
values for the inlet and outlet fittings
are different and must be adhered to in
order to prevent damage to the PRD
body.
5. Final tighten the adjustment nut on the
inlet fitting with one wrench while holding
the body of the PRD with another wrench.
Torque adjustment nut to specification.
Refer to 1.3.3. “PRD Torque Values” on
page 8 in this bulletin for torque specification.
6. Final tighten the adjustment nut on the outlet fitting with one wrench while holding the
body of the PRD with another wrench.
Torque adjustment nut to specification.
Refer to 1.3.3. “PRD Torque Values” on
page 8 in this bulletin for torque specification.
1.3.2.3. Removal (PRD with straight
connectors)
1. Defuel tanks. Refer to “Zone Three Venting
Procedure” in your New Flyer Service
Manual for defueling procedure.
2. Remove the PRD located near the end of
the tank, opposite the solenoid valve, as
follows:
a. Loosen the Swagelok® fittings and disconnect vent lines from PRD inlet and
outlet connectors. Remove PRD from
vehicle.
b. Unthread inlet and outlet connectors
from either end of the PRD and discard
O-rings.

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

SMB-115B

SERVICE MANUAL BULLETIN
SMB-115B
1.3.2.4. Installation (PRD with straight
connectors)

1.3.2.5. Removal (PRD installed directly in end
of tank)
1. Defuel tanks. Refer to “Zone Three Venting
Procedure” in your New Flyer Service
Manual for defueling procedure.

Ensure directional arrow stamped on
body of PRD is pointing in direction of
flow, toward vent line outlet.
1. Install a new O-ring on the connector and
lightly lubricate the O-ring with silicone
grease. Thread the connectors into either
end of the PRD.

2. Loosen the Swagelok® fittings and disconnect vent line from PRD elbow fitting. See
“Fig. 2: Tank-End PRD Installation” on
page 7.
3. Loosen the adjustment nut on the elbow fitting and unthread the fitting from the PRD.
Discard the O-ring.
4. Remove the PRD from the tank and discard O-ring.

ALWAYS tighten PRD connectors to the
torque value specified for the inlet and
outlet location on the PRD. Torque
values for the inlet and outlet
connectors are different and must be
adhered to in order to prevent damage
to the PRD body.
2. Clamp the wrench flats of the PRD body in
a soft-faced vise and torque the connector
fitting located at the outlet end of the PRD
to specification. Refer to 1.3.3. “PRD
Torque Values” on page 8 in this bulletin for
torque specification.

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),77,1*
25,1*

(/%2:

3. Reverse the position of the PRD in the vise
and torque the connector fitting located at
the inlet end of the PRD to specification.
Refer to 1.3.3. “PRD Torque Values” on
page 8 in this bulletin for torque specification.

35'

4. Install PRD with attached connectors to
the vent lines, ensuring the directional
arrow on the PRD body is pointing in the
direction of flow, toward the vent line outlet.
5. Connect the vent lines to the PRD connectors, ensuring the vent lines are fully
seated within the Swagelok® fittings, and
then tighten the Swagelok® fittings in
accordance with existing instructions in
your New Flyer Service Manual.

SMB-115B

s132502a.svg

Fig. 2: Tank-End PRD Installation

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

7 of 8

SERVICE MANUAL BULLETIN
SMB-115B
e. Tighten adjustment nut until lightly
seated. Do not final tighten adjustment
nut at this time.

1.3.2.6. Installation (PRD installed directly in
end of tank)

4. Align elbow with vent line and insert vent
line into fitting until fully seated.
DO NOT overtighten PRD. Threaded
boss in tank is made of aluminum and
can
be
damaged
if
PRD
is
overtightened. ALWAYS torque to
specification.

5. Tighten the Swagelok® fitting in accordance with existing instructions in your
New Flyer Service Manual.
6. Final tighten the adjustment nut on the
elbow.
1.3.3.

DO NOT apply excessive lubricant to
the O-ring on the PRD. Excessive
lubricant can prevent the O-ring from
sealing properly. Use only a minimal
amount of lubricant on the O-ring.

PRD Torque Values

PRD TORQUE VALUES
PRD P/N
048919

1. Lightly lubricate the new O-ring with silicone grease and ensure it is properly
installed in the O-ring groove of the PRD.
2. Install the new PRD into the threaded boss
of the tank and torque to 90 to 110 ft-lb.
(122 to 149 Nm).

069774

Inlet Fitting - 35 to 45 ft-lb.
(47 to 61 Nm)
Outlet Fitting - 15.8 to 17.5 ft-lb.
(21.4 to 23.7 Nm)

098252

Inlet Fitting - 35 to 45 ft-lb.
(47 to 61 Nm)
Outlet Fitting - 15.8 to 17.5 ft-lb.
(21.4 to 23.7 Nm)

b. Lightly lubricate new O-ring with silicone grease and install against the
backup washer on the elbow fitting.
c. Thread the elbow fitting into PRD until
lightly seated.

Inlet Fitting - 35 to 45 ft-lb.
(47 to 61 Nm)
Outlet Fitting - 35 to 45 ft-lb.
(47 to 61 Nm)

3. Install the elbow fitting into the outlet of the
PRD as follows:
a. Fully retract the adjustment nut on the
elbow fitting.

Torque

069837

90 to 110 ft-lb. (122 to 149 Nm)

098277

90 to 110 ft-lb. (122 to 149 Nm)

d. Loosen elbow fitting sufficiently to align
with vent line when installed.

8 of 8

The New Flyer vehicles described in this manual may be protected by one or more
patents and design applications or registrations in the United States and Canada,
and in other countries. Refer to “Vehicle Patent Information” in this manual.
Copyright © 2014 New Flyer Industries Canada ULC

SMB-115B