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MIS-MATCH!

Never connect products with hammer union end connections that are not positively identified as to the manufacturer and that are not identified to have identical union figure number, size and pressure rat-ing. Mismatched connections may fail under pres-sure, which can result in serious personal injury, death and/or property damage.

Figure 17 - Mismatch of hammer union end connections

4.1.1.1 Use of the Go No-Go Gauge

The Go No-Go Gauge shall be used to be sure you have a 1502 Female Sub. The gauge will be “No-Go” on a 1502 sub but will be a “Go” on a 602 sub.

It is important that the inside diameter of the GO NO-GO ring reflects the NO -GO of the 2 in. 1502 rather than -GO on the 2 in. 602. There are 2 in. 602 female subs which are not replicas of the original WECO 2 in. 602, having larger dia -meters. The flat gauge ring ID should have 4.000 inch (^101.6mm)opening so it will GO on these proprietary replica unions but still NO-GO on the 2 in. 1502 female sub thread. The 2 in. 1502 union thread is 4.109 inch (104.4 mm) minimum OD.

2 in. Fig 1502 Female - NO-GO 2 in. Fig 602/G/Sealomatic/607 Female - GO

Figure 18 - Using the Go No-Go gauge This go/no-go gauge can be purchased from either:

FMC at 800-772-8582 (Select 1, then 1 for Flowline Customer Service) or

Wood Machine Company, Tulsa, OK (Part number 477990000) at 918-438-2412 or email: [email protected]

2 in Fig 1502

No-Go interference

2 in Fig 602 2 in Kemper Fig G, Guiberson Sealomatic & Best Fig 607

2 in American Block Fig 602

Varying clearances between gauge and female stubs

4.109 in. 3.812 in. 3.938 in. 3.922 in.

4.1.2 Mismatching Pipe Pressure Ratings

This type of mismatch refers to connecting hammerlug union products having different pressure ratings but with end connections of the same size and figure number. This occurs when mixing sour gas pipe with standard service pipe or when unions are welded to pipe with a working pressure lower than that corresponding to the union.

The use of Sour Service pipework in Standard Service applications (but not the other way round)is allowed, but discouraged. In these instances, it is imperative that the working pressure of the Sour Service pipework is not exceeded.

2 in. 1502 Standard Female Sub

2 in. 1502 Sour Service Male Sub and Wing Nut

MIS-MATCH!

Wing union components that cannot be positively identified with regard to manufacturer, size, figure number, pressure rating and type of service must never be used. Incorrectly identified components will lead to hazardous assemblies, which can fail under pressure and result in serious personal injury, death and/or property damage.

15,000psi WP

10,000psi WP

Figure 19 - Mismatching of wing union components

4.1.3 Mismatching Wing Nuts

This mismatch occurs when the wing nut of one size and figure number is mounted on the male sub of another size and figure number. There is only a small amount of engagement of the male sub in the wing nut and therefore the

connection will not safely hold typical working pressures.

4.1.4 Mismatching Components

Mismatching of components occur when segments and nut of one figure number are made up to a detachable male sub with a different figure number. This results in a small amount of engagement of the male sub with the segment engaging the wing nut. This will not hold pressure safely during typical operations.

MIS-MATCH!

Never assemble any combination of male sub, wing nut or segments that are not positively identified to assure that union figure number, size, pressure rating and manufacturer are identical. Mismatched components will result in hazardous connections, which may fail under pres-sure, which can result in serious personal injury, death and/or property damage.

Figure 21 - Mismatch caused by misidentification - detachable male sub

MIS-MATCH!

Never assemble any combination of male sub, wing nut or segments that are not positively identified to assure that union figure number, size, pressure rating and manufacturer are identical. Mismatched components will result in hazardous connections, which may fail under pres-sure, which can result in serious personal injury, death and/or property damage.

Figure 20 - Mismatch caused by misidentification - standard male sub

4.1.5 Mismatching Non-Detachable and Detachable Components This mismatch is caused by the assembly of non-detachable nuts on detachable male subs. The detachable wing nuts require a longer thread length to compensate for the segments between the wingnut and the sub shoulder. Use of a non-^detach -able wing nut in a detach-able union results in a lack of thread engagement and an insufficient engagement between of the male sub shoulder with the wing nut ID.

4.1.6 Connecting a Hammer Union Male Sub from one manufacturer to the Female Sub from a different manufacturer.

The practice of mating connection components from different manufacturers where no industry standard exists for the design and manufacture of the connection is generally not allowed. In the case of Hammer Unions, the acme thread is specified by ASME B 1.5, 1.8, but not the sealing arrangement.

The male sub (all components from one manufacturer)can be mated with the female sub from another manufacturer if there is an operational history of mating integrity.

MIS-MATCH!

The misapplication of standard, non-detach-able style wing nuts on 2 in., 3 in. and 4 in.

Figure 602 and 1002 detachable nut connec-tions will result in an unsafe connection leading to separation when under pressure.

Failure to avoid this condition may result in death, serious personal injury and severe property damage.

4 in. 1002 non-detachable nut inappropriately assembled to a detached male sub end. Notice the excessive play between the ID of the nut and male sub OD behind the shoulder.

Figure 23 - Another misapplication of wing nuts

MIS-MATCH!

The misapplication of standard, non-detach-able style wing nuts on 2 in., 3 in. and 4 in.

Figure 602 and 1002 detachable nut connec-tions will result in an unsafe connection leading to separation when under pressure.

Failure to avoid this condition may result in death, serious personal injury and severe property damage.

4 in. 1002 non-detachable nut inappropriately used in a detachable union assembly. Notice the resulting lack of thread engagement with the female sub.

Figure 22 - Misapplication of wing nuts

4.2 Mismatching Swivel Joint Components

Because of similarities in design, it is physically possible to erroneously assemble a male race end of a SPM 3 in. HD-LR component into the female race end of an FMC 3 in. TSi component. The assembly would not be structurally sound.

4.3 Mating Hub Connector Components from different manufacturers

The issue arises as the patent for Grayloc© has expired and Grayloc will not endorse the integrity of the connection with components “copies” from another manufacturer. The mating of hub connector components from two different manu-facturers (only)is allowed if:

 The components are dimensionally the same and mechanically equiva-lent.

 The hub connector face shall be from one manufacturer and all the other connector components shall be sup-plied by the other manufacturer.

 The assembled connector integrity has been validated at temperature, pressure and side-loading by the manufacturer supplying the majori-ty of the components.

If these conditions cannot be ascertained, a crossover should be manufactured with the sealing faces from the respective manufacturers on opposite ends to avoid mixing the connector components.

Gap in 3 in.

ball race

No step between second and third race

SPM 3 in. HD-LR male ball race end

FMC 3 in. TripleStep female ball race end

SPM 3 in. HD-LR female ball race end FMC 3 in. TripleStep

male ball race end Male race interferes with female end

Dangerous Mismatch to be Avoided

Figure 24 -Dangers of mismatching swivel joint components

Do not mix components from different manufacturers

Figure 25 - Mating Hub Connectors 1 Hub Connector Face

from Manufacture “A”

All other components from Manufacturer “B”

4.4 Threaded Connections

The requirement limiting NPT and line pipe pressure sealing threads (PST) to ¹/2”

connections has been amended to allow larger nominal sizes, subject to strict QC criteria. (See section 4.4.3).

The issues with pressure sealing threaded connections are illustrated below:

In Figure 26 the pressure containing equipment with 2” NPT (Pressure Sealing Threads)provides a false sense of security -one cannot tell the condition of the threaded connection as it can be corroded by well or pumped fluids, or been fully made up.

2” NPT connection

(Pressure Sealing Thread)

Hammer lug Weco union to 2” nipple engaged by 6 -7

threads only (Normal engagement requires 8 - 9

threads) Should be made up to

this point

Figure 26 - NPT in poor condition due to corrosion and with insufficient make-up

4.4.1 Non-Pressure Sealing Thread (NPST) & Pressure Sealing Thread (PST) Line Pipe and NPT

Figure 27 - NPST vs. LPT

The NPST connection was developed in order to isolate the tubing thread from the contained fluid.

Tubing thread

Male sub Seal ring

Wing nut

Female sub

NPST Connection – Allowed