GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Utility Connections to Piping and
Equipment
GP 03-06-03
Scope
1) [I] This Global Practice (GP) covers the design of steam, industrial water, air, or inert gas connections
to piping and equipment.
2) [I] Cooling water connections to process coolers and condensers, instrument air connections, and all
connections for chemicals, hydrogen, and natural gas are not within the scope of this GP.
3) [I] Potable water connections are not covered in this GP because connections to potable water are not
permitted.
Refining/Chemicals, Downstream
Imperial Oil
Page 1 of 11
For Company Use Only
Version 2.0.0
ExxonMobil Development Company
Copyright Waiver
ExxonMobil Development Company and ExxonMobil Pipeline Company hereby license the use of ExxonMobil Engineering Practices System (EMEPS) Global Practices (GPs) for
use by any ExxonMobil division, subsidiary, or more-than-50%-owned affiliate. The GPs may be downloaded and modified as necessary for project and affiliate use. Written
permission from ExxonMobil Development Company or ExxonMobil Pipeline Company is not required. However, any modified GPs must be renumbered to a project-specific or
affiliate-specific number to distinguish them from the GPs on the EMEPS web site. ExxonMobil operated joint ventures may utilize GPs to create project-specific or location-specific
specifications. It is the responsibility of individual affiliate or joint venture to ensure that the use of GPs and their derivatives is limited to joint venture related business and not
disclosed or used outside the JV without appropriate EM management approval.
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Table of Contents
Table of Figures............................................................................................................. 3
1.
Required References ............................................................................................ 4
1.1.
ExxonMobil Publication ................................................................................ 4
2.
Definitions.............................................................................................................. 4
3.
Materials................................................................................................................. 5
4.
Design .................................................................................................................... 5
4.1.
4.2.
4.3.
4.4.
4.5.
4.6.
4.7.
5.
Unlined Piping or Equipment ........................................................................ 5
Thermally Lined Piping or Equipment ........................................................... 5
Critical Connections...................................................................................... 5
Connections Other Than Critical Connections .............................................. 5
Connections Used When Equipment Is Not Operating ................................. 6
Air Piping Connected to Asphalt or Hot Oil ................................................... 6
Connections to Potable Water Systems Prohibited ...................................... 6
Additional Requirements for Utility Stations ...................................................... 8
Record of Change ......................................................................................................... 9
Attachment: Purpose Code Definitions .................................................................... 11
RFCH, DIOL
For Company Use Only
Page 2 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Table of Figures
Figure 1: Permanently Piped Critical Connections ................................................... 6
Figure 2: Infrequent Service Critical Connections .................................................... 7
Figure 3: Non-Critical Connections ............................................................................ 7
Figure 4: Connections When Equipment Is Not Operating ...................................... 8
RFCH, DIOL
For Company Use Only
Page 3 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
1. Required References
This Section lists the Practices, codes, standards, specifications, and publications that shall be used with
this document. Unless otherwise specified herein, use the latest edition.
1.1.
ExxonMobil Publication
EMPR OIMS Manual
Operations Integrity Management System Manual for ExxonMobil
Process Research
(http://emre.na.xom.com/erdlsafety/OIMS_Manual/Index.htm)
2. Definitions
Term
[I] Description
Critical Connections
Connections involving the following services:
Service Category
1)
Utility (industrial) water or steam connected to lines or equipment
operating above 212°F (100°C).
2)
Utility (industrial) water or steam connected to lines or equipment
operating below 32°F (0°C).
3)
Connections to lines or equipment containing toxic materials. A
fluid may be considered "toxic" when the (Industrial Hygiene)
Respiratory Exposure Hazard Class is R-1, R-2, or R-3, as specified
in the Environmental, Equipment, Exposure Review (EEER), or as
otherwise specified by the Owner.
4)
Connections to lines or equipment in which the process pressure
may exceed the utility pressure.
As used in this GP, service categories define the frequency that a utility
connection is expected to be used.
Continuous Service—used all the time during normal process operations
Emergency Service—used only as required for emergencies
Frequent Service—used two or more times per month, but not
continuously
Infrequent Service—used less than twice per month
RFCH, DIOL
For Company Use Only
Page 4 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
3. Materials
[S] Materials between the utilities specification break and the process line or equipment shall be suitable
for the more severe condition of the process or utility service at the maximum metal temperature of the
connective piping.
4. Design
4.1.
Unlined Piping or Equipment
[S] For connections to unlined piping or equipment, the rating of the connective piping, including block
and check valves, from the process line or equipment through the utilities specification break shall be
suitable for the more severe line classification of either service.
4.2.
Thermally Lined Piping or Equipment
[S] For connections to internal thermally lined piping or equipment, the rating of the connective piping,
including block and check valves, shall be suitable for the maximum calculated or demonstrated metal
temperature of the connective piping, and for the more severe design pressure of either service. The
maximum metal temperature shall be determined taking into account both maximum utility flow and no
utility flow cases.
4.3.
Critical Connections
1) [S] [O] [R] Critical utility connections in continuous, frequent, or emergency service shall be
permanently piped per Figure 1.
2) [S] [O] [R] Critical utility connections in infrequent service shall be piped per Figure 2.
4.4.
Connections Other Than Critical Connections
1) [O] [R] Utility connections in continuous, frequent, or emergency service shall be permanently piped
per Figure 3 with the blind point open.
2) [O] [R] Utility connections in infrequent service shall be piped per Figure 3 with the blind point
closed when not in service.
4.4.1.
Inlet Connections to Internal Equipment
[S] Utility inlet connections to internal equipment (for example, coils or tube bundles) inside piping or
pressurized equipment (excluding steam coils in atmospheric storage tanks) shall be permanently piped as
illustrated in Figure 3. The utility system upstream of the process line or equipment through the first
block valve and check valve shall be suitable for a minimum design pressure equal to not less than 3/4 of
the process line or equipment design pressure.
4.4.2.
Outlet Connections to Internal Equipment
[S] Utility systems, including auxiliaries such as steam traps, connected to the outlet from internal
equipment inside piping or equipment, shall be suitable for a minimum design pressure equal to not less
RFCH, DIOL
For Company Use Only
Page 5 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
than 3/4 of the piping or equipment design pressure through the first downstream block valve. Where the
block valve is installed upstream of the steam trap, or where the utility system extends to other users, the
utility system downstream of the block valve shall be protected with a pressure relief device.
4.5.
Connections Used When Equipment Is Not Operating
[A] [M] [O] Connections used only when equipment is not operating (i.e., isolated and under no
significant pressure), such as connections for steaming, flushing, or purging, shall be breakaway type per
Figure 4. When not in use, connections shall be valved and plugged, except that nozzles may be blanked
for connections NPS 2 (50 mm) and larger when approved by the Owner's Engineer.
4.6.
Air Piping Connected to Asphalt or Hot Oil
[S] [R] Air lines connected to asphalt or hot oil piping operating above 200F (93C), through which air
is supplied to blow the product to tankage, shall be provided with a water knockout drum with drainage
facilities. The section of air piping downstream of the knockout drum shall not contain low points. A
valved drain shall be provided in the air line immediately upstream of the block valve at the connection to
the piping.
4.7.
Connections to Potable Water Systems Prohibited
[S] No connection shall be made between a potable water system and any other piping system or process
equipment.
Figure 1: Permanently Piped Critical Connections
Utility Piping
Spec.
Per Section
4.1 and 4.2
Process Line or
Equipment
See Note 5
See Note 2
From
Header
See Note 1
See Note 2
See Note 3
and 4
See Note 3
and 4
See Note 4
NOTES:
(1) This valve must be readily accessible and shall not be more than 50 ft (15 m) from the connection to the process line or
equipment.
(2) [A] Unless an alternate location is approved by the Owner’s Engineer, the block and both check valves shall be located
adjacent to the process line or equipment. If operator access to the connective point is not provided, the block and check
valve shall be located at the closest position where access exists. Unions, couplings, or other fittings that are potential leak
sources are not permitted between this block valve and the process line or equipment nozzle.
(3) This valve is used to test for back-flow through the check valve.
(4) Bleeder valves shall remain closed and plugged, capped, or blinded, except when checking for a leaking check valve or
block valve.
(5) Both of these check valves must be mechanically unique to avoid common cause failure. They shall be evaluated to
determine if they meet the OIMS 6.3 criteria to be classified as SHE critical check valves.
RFCH, DIOL
For Company Use Only
Page 6 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Figure 2: Infrequent Service Critical Connections
Utility Piping
Spec.
Per Section
4.1 and 4.2
Process Line or
Equipment
See Note 6
See Note 2
From
Header
See Note 1
See Note 4
and 5
See Note 5
Hose or Pipe Breakaway
Connection - See Note 3
NOTES:
(1) This valve must be readily accessible and shall not be more than 50 ft (15 m) from the connection to the process line or
equipment.
(2) [A] Block and check valve shall be located adjacent to the process line or equipment. If operator access to the connective
point is not provided, the block and check valve shall be located at the closest position where access exists. This alternative
location shall be approved by the Owner’s Engineer. Unions, couplings, or other fittings that are potential leak sources are
not permitted between this block valve and the process line or equipment nozzle.
(3) Limitations on the use of hoses:
a) [S] Connections NPS 2 (50 mm) and Smaller - Hoses may be used for breakaway connections provided the hoses are
adequate for the design conditions (fluids, temperatures, and pressures) of both the utilities and the process lines or
equipment that are to be connected.
b) Connections NPS 3 (75 mm) and Larger - Do not use.
(4) This valve is used to test for back-flow through the check valve.
(5) Bleeder valves shall remain closed and plugged, capped, or blinded, except when checking for a leaking check valve or
block valve.
(6) This check valve shall be evaluated to determine if it meets the OIMS 6.3 criteria to be classified as a SHE critical check
valve.
Figure 3: Non-Critical Connections
Utility Piping
Spec.
Per Section
4.1 and 4.2
Process Line or
Equipment
See Note 5
See Note 2
From
Header
See Note 1
See Note 3 and 4
See Note 4
NOTES:
(1) This valve must be readily accessible and shall not be more than 50 ft (15 m) from the connection to the process line or
equipment.
(2) [A] Block and check valve shall be located adjacent to the process line or equipment. If operator access to the connective
point is not provided, the block and check valve shall be located at the closest position where access exists. This alternative
location shall be approved by the Owner’s Engineer. Unions, couplings, or other fittings that are potential leak sources are
not permitted between this block valve and the process line or equipment nozzle.
(3) This valve is used to test for back-flow through the check valve.
(4) Bleeder valves shall remain closed and plugged, capped, or blinded, except when checking for a leaking check valve or
block valve.
(5) For Continuous, Frequent, or Emergency service, the blind point shall be open. For infrequent service, the blind point shall
be closed when not in service.
RFCH, DIOL
For Company Use Only
Page 7 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Figure 4: Connections When Equipment Is Not Operating
Utility Piping
Spec.
Process Line or
Equipment
Per Section
4.1 and 4.2
See Note 1
From
Header
See Note 3
Hose or Pipe Breakaway
Connection - See Note 3
NOTES:
(1) [A] Block and check valve shall be located adjacent to the process line or equipment. If operator access to the connective
point is not provided, the block and check valve shall be located at the closest position where access exists. This alternative
location shall be approved by the Owner’s Engineer. Unions, couplings, or other fittings that are potential leak sources are
not permitted between this block valve and the process line or equipment nozzle.
(2) Limitations on the use of hoses:
a) [S] Connections NPS 2 (50 mm) and Smaller - Hoses may be used for breakaway connections provided the hoses are
adequate for the design conditions (fluids, temperatures, and pressures) of both the utilities and the process lines or
equipment that are to be connected.
b) Connections NPS 3 (75 mm) and Larger - Do not use hoses except to connect to water that will be used to wash
equipment during turnarounds.
(3) Bleeder valves shall remain closed and plugged, capped, or blinded, except when checking for a leaking check valve or
block valve.
5. Additional Requirements for Utility Stations
1) [S] Utility (industrial) water shall be used for hot and cold water at utility service stations. Fire water,
cooling tower water, or steam condensate shall not be used.
2) [S] Steam at pressures above 150 psig (1030 kPa) nominal pressure shall not be used.
3) [S] Industrial air shall be used when air service is specified. The use of instrument air is prohibited.
4) [S] A unique coupling and color code shall be used for each of the four main utilities: air, steam,
utility (industrial) water, and nitrogen.
5) [O] [R] Size of piping to utility service stations from supply headers shall be 3/4 in. (19 mm)
minimum.
RFCH, DIOL
For Company Use Only
Page 8 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Record of Change
Version 1.0.0
Location
Action
Date: 07/01
Description
Initial Publish.
Version 1.0.0
Date: 09/03
Global Practice version number and format updated to comply with new
process; however, original publish date remains, and no content was
modified.
Version 1.1.0
Date: 04/07
Section 1
Revision
Revised definition of Frequent Service to include twice per month.
Section 3.3.1
Revision
Revised heading to limit scope to inlet connections. Added exclusion for
atmospheric storage tanks. Deleted second paragraph. Revised rationale
for clarity.
Section 3.3.2
New
New paragraph for outlet connections. Captures information deleted from
Section 3.3.1. Revised last sentence for clarity.
Section 3.4.1
Revision
Revised wording for clarity.
Section 3.6
Revision
Deleted refinery example from Rationale.
All Global
Practices
Modifications
To standardize the format of the Global Practices and to meet other
requirements, the following changes have been implemented:
"For ExxonMobil Use Only" has been replaced with "For Company Use
Only."
A copyright waiver has been added in the first page Footer.
The definition of asterisks in the Scope has been deleted. The asterisk is
now defined in the Purpose Code attachment and is used within brackets as
other Purpose Codes.
Multiple paragraphs within a Section have been numbered.
The standard text for Required References has been modified.
The standard text for Additional Requirements has been modified.
The [S] Purpose Code has been modified.
The following Purpose Codes have been added:
[*] for additional information or decision required of Owner's Engineer.
[A] for approval requirements before beginning work or finalizing
design.
RFCH, DIOL
For Company Use Only
Page 9 of 11
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
Version 2.0.0
Section 1
Addition
Added reference to OIMS.
Section 2
Revision
Revised Column title from "Category" to "Term."
September 2008
Date: 09/08
Added definition for Critical Connections.
Compiled definitions for service categories into one entry.
Added definition of toxic materials.
Section 4.3
Revision
Replaced the section explaining permanently piped connections with an
explanation of critical connections.
Added requirements for critical connections that are to be permanently
piped.
Added requirements for critical infrequent services.
Moved sections on internal equipment inlet and outlet connections to
Section 4.4.3 and 4.4.4.
Section 4.4
Revision
Replaced the section explaining temporary connections with an explanation
of non-critical connections.
Moved definitions of critical service to Section 2.
Added requirements for non-critical permanently piped services.
Added requirements for non-critical infrequent services.
Section 4.4.3
New
Moved from previous Section 3.3.1.
Section 4.4.4
New
Moved from previous Section 3.3.2.
Section 4.5
New
Moved from previous Section 3.4.1.
Figure 1
Revision
Replaced "Permanently Piped Utility Connections" with "Permanently
Piped Critical Connections," which illustrates the new requirement of two
mechanically unique safety critical check valves.
Figure 2
Revision
Replaced "Temporary (Breakaway) Utility Connections" with "Infrequent
(Temporary) Critical Connections," which includes the new requirement of
a safety critical check valve and includes the breakaway connection inside
the piping spec of this Practice.
Figure 3
New
Illustrates the requirements for Non-Critical connections with a note to
indicate the position of the blind depending on whether the service is
frequent, continuous, emergency, or infrequent.
Figure 4
New
Illustrates the requirements of Section 4.5.
RFCH, DIOL
Page 10 of 11
For Company Use Only
ExxonMobil Development Company
Version 2.0.0
GP 03-06-03
Utility Connections to Piping and Equipment
September 2008
Attachment: Purpose Code Definitions
Code
Description
*
Assigned to paragraphs that require the Owner's Engineer to provide additional information or
make a decision.
A
Assigned to paragraphs that require approval from the Owner's Engineer before the work may
proceed or the design is finalized.
C
Assigned to paragraphs whose primary purpose is reduced costs. Reduced cost in this context
refers to initial investment cost and does not include life cycle cost considerations. Life cycle
cost considerations are captured under reliability, maintainability, or operability purpose codes.
E
Assigned to paragraphs whose primary purpose is driven by environmental considerations.
Environmental considerations typically include specifications intended to protect against
emissions/leakage to the air, water, and/or soil. Deviations from the specifications contained
in such paragraphs require formal review and approval according to local environmental
policy.
I
Assigned to paragraphs that provide only clarifying information, such as Scope statements,
definitions of terms, etc.
M
Assigned to paragraphs whose primary purpose is to provide for maintainability of equipment
or systems. Maintainability provisions are those that facilitate the performance of maintenance
on equipment/systems either during downtimes or during onstream operations.
O
Assigned to paragraphs whose primary purpose is to assure operability of equipment or
systems. Operability is the ability of the equipment/system to perform satisfactorily even
though conditions are off-design, such as during start-ups, process swings, subcomponent
malfunction, etc.
R
Assigned to paragraphs whose primary purpose is to improve or assure the reliability of
equipment or systems. Reliability is a measure of the ability of equipment/systems to operate
without malfunction or failure between planned maintenance interventions.
S
Assigned to paragraphs containing specifications/guidance where the primary purpose is the
avoidance of incidents impacting personnel safety, operational safety, and the public in general
and/or involving responses to emergency situations. Any deviation from the specifications
contained in such designated paragraphs requires formal review and approval according to
local safety policy.
Personnel Safety:
Refers to incident-related personnel injuries or illness, e.g., burns, cuts,
abrasions, inhalation of or exposure to dangerous substances, etc., that
could result in medical treatment, restricted work, lost-time incidents, or
fatalities.
Operational
Safety:
Refers to the prevention and control of process releases, fires, and/or
explosions that could result in damage to equipment, process disruption,
or personnel injury or illness.
RFCH, DIOL
Page 11 of 11
For Company Use Only
ExxonMobil Development Company
Version 2.0.0