TOYO 1-55

TOKYO

JAPAN

Ibro Emghneeiung Cobs ISSUED

|

FEB. 10,89

3.7 Casing Design Pressure (1) Casing design pressure except for double casing or multi-stage pumps should be higher than the maximum discharge pressure (MDP), except that the thickness of the pump casing is to be suitable for the MDP plus allowances for head and speed increase. (2) Hence, the maximum discharge pressure (MDP) is decided according to the following formula: MDP (kgf/cm2G) = Shutoff head (D x Sp.Gr. + MaJt_ Buction preBBUre 10

(kgf/cm2G)

If the pump head curve has a peak point, the shutoff head should be replaced with a peak head. Further to the above, the maximum discharge pressure may be equal to setting pressure of a relief valve provided that the relief valve is equipped at the pump discharge. (3) When the MDP exceeds 1.1 times pump rated discharge pressure, it will affect potentially the design pressure of equipment and systems at down-stream of the pump. In this case, the design pressure of the subject equipment and systems should be adjusted accordingly.

3.8 Total Head of Vertical Sump Pumps For vertical sump pumps, the following points should be taken into account to avoid misunderstanding between Purchaser and Vendor:

(1) It should be clearly stated on the inquiry specification (i.e. data sheet), that the discharge pressure and total head is designated at the point of discharge nozzle. (2) When pumps are tested in performance at Vendor's shop and the discharge pressure is measured at the point of * in Fig. 9, the pump performance should be corrected accordingly. FORM A-G30.014

TOKYO Tbso

JAPAN

Emoinbbxing Corp.

ISSUED

|

FEB.10,89

pTEC i—►

r L Fig. 9 Vertical Sump Pump 3.9

Bearing Material for Vertical Pumps

(1) Material for radial bearings of vertical pumps should be carbon, which has the strong recommendation from past experience. (2) For low temperature service such as liquid ammonia or liquid propane gas (LPG), this requirement is mandatory, (3) 3.10

For water service, cast iron, niresist or bronze is applicable, Insulation for Vertical Pumps

Vercial pumps for low temperature service are usually provided with cold insulation around their barrel to protect the pumps from being jacked up due to freezing. In this case, the designer should take care of baseplate size and position of anchor bolts to be properly fit with the insulation (Fig. 10).

‘ fQ sucT.

TANK VAPOR ZONE

FORM A-G30.0 14

0 TOKYO |^J JAPAN

Ibro Enoinbbxing Cokr

ISSUED

FEB.10,89

ENGINEERING MANUALS DESIGN CONSIDERATIONS FOR CENTRIFUGAL PUMPS

TEM 4 1 4 1 E PAGE 9 OF 13 3.11

Equalizing Piping for Vertical Pumps

Vertical pumps handling saturated liquid such as LPG and liquid ammonia should be furnished with equalizing piping at pump suction in order to get ventilation. This piping should have enough size to vent gas released and should rise continuously to a suction vessel. The equalizing piping is preferably separated from flushing piping from/to mechanical seals. 3.12

Automatically Started Pumps

(1) A starting torque curve of automatically started pumps has a different shape from that of manually started pump as shown in Fig. 11. (2) The designer should clearly identify the pump which is automatically started and inform a motor manufacture of this fact. If necessary, the starting torque curve should be sent to the motor manufacturer. Remark: In Fig. 11, the cross point of the torque curves gives us an idea of operating speed.

®-DISCHARGE VALVE OPEN (AUTOMATIC) ©---DISCHARGE VALVE SHUT (MANUAL) Fig. 11 Pump Starting Torque Curve (3) It is recommended that output power rating of drivers should cover the power required by the automatically started pump at the end of curve. 3.13 Shaft Seals (1) Mechanical seals will be used for flammable or toxic service. API Standard 610 calls for use of the mechanical seals for all services. (2) Gland packings can' be used for services of cooling water, steam condensate or other water. (3) The mechanical seals, which are used for the service containing slurry, are externally flushed with clean liquid. (4) For high temperature services, the mechanical seals are usually provided with a cooler in a flushing line or they are of bellow type.

FORM A-G30n 14

TOKYO Ibro

JAPAN'

ErfOiXEEitiNG Corf

ISSUED

|

FEB.10,89

(5) For vacuum services, the followings are criteria of selection of the mechanical seal type: 2 -

0.4 kgf/cm G and above:

single

mechanical seal with quenching 2 -

under 0.4 kgf/cm G :

Double

mechanical seal (6) Recently a tandem or a double mechanical seal becomes popular in use for low temperature hydrocarbon. The double mechanical seal needs an expensive sealing system consisting a reservoir, pumps and coolers. (Refer to Attachment (4) in detail.) Non-seal pumps can be optionally replaced with such special application.

Picking

Packing

Fore*

Fore*

Connection A (rater to appropriate primary M«* piping arrangement}

Tandem Seals

ConoacfonCfrofar to appropriate

tandsm sasl piping arrangarnom)

Connection B (relerto appropriate mmflarr *asl piping arrangement)

aaureunoar

bueKng (mechanical eaal

matrtrtv* buaWng) or euaMvy Mdtogdwtos

Fig. 12 Pump Shaft Seals 3.14 Limited End Float Couplings When a driving motor is equipped with sleeve bearings, a coupling between the motor and a pump should be of limited end float type. This type of coupling prevents a rotor of motor from moving more excessively than limited by motor end play. For further details, refer to Engineering Manual TEM-4047E. FORM A.-G300 (4

TOKYO

JAPAN

Tbn> Engineering Cow.

ISSUED 3.15 (1)

|

FEB. 10,89 Resonance Vibration of Large Vertical Pumps with Motor Speed

If a frame of large sized vertical pumps has an resonance in natural

frequency with Z x operating speed (2=1,2.......), such pumps do potentially encounter vibration. (2) During detailed design stage, the resonance frequency should be checked to be far from the revolutional speed and at the test it should be examined by hammering, etc. 3.16

Thrust Balancing and Shaft Sealing

(1) Thrust froce around an impeller with a balance holes will become different from that without balance holes as shown in Fig. 13. (2) When the impeller is provided with balance holes and suction pressure is higher than 15 to 20 barG, the thrust force loading impeller opening cannot be properly balanced, which results in overloading to the thrust bearing. Thus, in this case the impeller will not be furnished with the balance holes at all. (3) When the suction pressure of pumps is very close to liquid vapor pressure, flushing liquid, i.e. self liquid, in a stuffing box is possibly vaporized by heat generated at the part of matings of a mechanical seal provided that the box pressure is equal to the suction pressure. In this case, the impeller will not be furnished with the balance holes, either. (4) The box pressure, in such a.case that no balance hole is furnished, is nearly equal to pump discharge pressure. Flushing liquid to the mechanical seal will be circulated to "pump suction, which is called "Reverse Flushing" (API Plan No. 13).

COMBINED THRUST FORCE WITHOUT BALANCE HOLE.

COMBINED THRUST FORCE WITH BALANCE HOLE Fig. 13 Thrust Force around Impeller FORM A-G3OJ0 14

F

PUMP DA fA SHEET Attachment V2

7

8

9

1D

11

12

13

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J 'to cbfiMjt ' 1 -2proc_

rr^fcr-rgtTiJi ;^/^T%fTiirii>rrrg- tc n -mc&i

r PUMP DATASHEET Attachment 1-2 (14J1B)

I

2 3

4

5

6

1-2proc_

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SiZlixa, Jn (yC^Mj^ ■

TOKYO 0 JAPAN

Toyo Engineering Corp.

TITLE:

CHECK OF VENDOR’S PRINT FOR ROTATING MACHINERY

DATA SHEETS FOR CENTRIFUGAL PUMPS & EXPECTED PERFORMANCE CURVE TIME OF CHECK AT THE TIME OF THE FIRST ISSUE OF VENDOR’S DATA SHEETS AND PERFORMANCE CURVES.

WORK FLOW CHART

CHECK ITEMS AND POINTS

CHECK

ABC REMARKS

(1) Check if data designated by Vendors are coincident with inquiry spec. (2)

Check if all data are filled in by vendors.

(3)

Check if all latest revisions are identified with mark.

(4) Check if the pump case mounting, foot, centerline or vertical is in compliance with the applicable spec. (5)

Check if case split is in accordance with applicable spec.

(6)

Nozzle rating and facing

- Check if suction nozzle has the same rating as discharge nozzle for one- or two-stage pumps. -

Check if a flat face is applied to cast iron casings.

(7) Check if nozzle size of 1-1/4, (2-1/2), 3-1/2, (5), 7 or 9 inch is not used. (8) Check if overhung impellers of two stages or double suction is not used corresponding to the requirement of applicable spec. (9)

Impellers

- Check if design tip diameter of impellers is not equal to max. or min diameter for the case. - Check if 5 % margin is available in total head to that developed by an impeller of the max. diameter for the fixed speed horizontal pumps. (10) Check if wearing clearances axe as per applicable spec, or standard. □□

□

O □ □ MEMO

WORK NO.

REQ. NO. VENDOR DOC. NO.

2 1 0 REV.

TOKYO 0 JAPAN Toyo Engineering Corf.

TITLE:

CHECK OF VENDOR’S PRINT FOR ROTATING MACHINERY

DATA SHEETS FOR CENTRIFUGAL PUMPS & EXPECTED PERFORMANCE CURVE WORK FLOW CHART

CHECK ITEMS AND POINTS

(11) Check if hydrodynamic bearings are required in accordance with applicable spec, or standard (12) Check if ball thrust bearings are of duplex single row 40-deg. angular contact type as per API 610 Standard when applicable. (13) Check rating life of bearings, if necessary, by vendor’s calculation sheet. (14) Couplings - Check if a flexible coupling are used for horizontal pumps or vertical pumps with a thrust bearing as per spec. - Check if a rigid coupling is used for vertical pumps with no thrust bearings. - Check if a spacer coupling is provided and its space length is as per spec. (15) Check if rotating direction is coincident with an outline drawing and electrical load list. (16) Materials - Check compliance of requirement regarding materials as per applicable spec, and standards. - Check if hardness of wearing rings is correctly appointed as per applicable specification. - Check if hardness of sleeves is correctly appointed according

to type of shaft seals. - Check if any components include materials prohibited from being used in the inquiry spec. - Check if the materials for low temperature service are in compliance with applicable spec, or standards. (17) Check pump speed according to motor pole & frequency (slip

& speed reducer) (18) Check if NPSHR has margin to NPSHA appointed as follows; - min. 0.6 m margin between NPSHR & NPSHA as a guideline for horizontal pumps. - NPSH margin for the pumps used for Add Gas Removal units according to licenser’s spec. REMARKS

TOKYO 0 JAPAN Toyo Engineering Core.

TITLE:

CHECK OF VENDOR’S PRINT FOR ROTATING MACHINERY

DATA SHEETS FOR CENTRIFUGAL PUMPS & EXPECTED PERFORMANCE CURVE WORK FLOW CHART

CHECK ITEMS AND POINTS

A (19) Check pump rated BHP according to the equation using rated flow, head, spec, gravity and pump efficiency designated by vendor.

□ CHECK

B REMARKS

c (20)

Minimum continuous flow

- Check if the min. continuous flow is greater than normal flow. -

Check on P & I DIAGRAM if pumps are protected from the

operation with the flow under the min continuous flow. (21)

Max. operating pressure:

- Check if max. operating pressure is equal to or higher than max. suction pressure + shutoff pressure (with test tolerance) for fixed speed pumps. - Check if max. operating pressure is equal to or higher than max. suction pressure + shutoff pressure at max. continuous speed (with test tolerance) ter variable speed pumps - Check if max. operating press, is within piping spec. & flange rating. - Check necessity of a relief valve at suction line to protect the pump from overpressure during stand-by.

□ □ □ □ □ D

□ □ (22) Check if case design temp, is higher than pumping temp. + 10 deg.C. as per applicable spec. 0 (23) Check if case design press, is higher than max. operating press, appointed.

□ (24) Hyd. test press. - 1.5 x design pressure corrected by design temp.

□ Applicable high pressure pumps (25) Check if impeller tip speed vs. material is as per the following guideline;

□

Cast Iron Bronze Cast Steel 18-8SS Niresist Nodular iron 13% Cr Steel Ref. TEG1-1211-105 TOKYO 0 JAPAN

Toyo Engineering Corp.

ENGINEERING WORK CHECK SHEET DESIGN OF ROTATING MACHINE TWO ISSUED PAGE

TITLE:

CHECK OF VENDOR’S PRINT FOR ROTATING MACHINERY

DATA SHEETS FOR CENTRIFUGAL PUMPS & EXPECTED PERFORMANCE CURVE WORK FLOW CHART

CHECK ITEMS AND POINTS

A (26) Check if suction specific speed is 1900 (rpm,m3/m,m) or smaller for impellers with no inducer or 3000 or smaller for the impeller with an inducer.

□

CHECK

B C REMARKS

(27) Mechanical Seals: - Check if type of mechanical seals is in compliance with the inquiry spec, and applicable standards. - Check if face materials are properly selected according to applicable standards and vendor’s past experience. Especially both faces of tungsten carbide or silicon carbide are to be selected for caustic or slurry services. - Check if the sealing pressure is positive in any operating cases. Otherwise, check the protection for the seal against vacuum pressure.

□ □ D

□

□ (28) Auxiliary Piping - Check if seal piping plan is coincident with type of mechanical seals selected. - Check if materials of process piping are equal to or better than case material. - Check if cooling water piping is planned as per requirement of cooling for bearing housings, seal cooling inserts, pedestal cooling and so on. - Check if seal quenching is properly appointed for such services as heavy/crude oil, solidified liquid, caustic service, ammonium solution, vacuum service and so on.

- Check if the external flushing sources, if any, are available in such pressure as being supplied suitably to seals or wearing rings without being vaporized. - Check if the balance line (chamber), if available, is sized properly so that the chamber pressure is within the max. allowable pressure with leakage flow appointed by vendor.

□ □ D

□ □

□ □

□ □

□ (29) Casing Tapped Openings: - Check if vent and drain system is as appointed in PO conditions and is compatible with process P & ID. - Check if the terminal points, if any, have the same pressure rating as main nozzles, or higher.

□

□ Applicable to the multi-stage pumps. (30) Check if pump automatic start and/or stop is correctly appointed as per P & ID.

□ icia::

TOKYO 0 JAPAN Toyo Engineering Corf.

TITLE:

CHECK OF VENDOR’S PRINT FOR ROTATING MACHINERY

DATA SHEETS FOR CENTRIFUGAL PUMPS & EXPECTED PERFORMANCE CURVE WORK FLOW CHART

REMARKS

The incipient cavitation does potentially occur at around 50% of BEP.

TOKYO

9b

JAPAN

Toyo Engineering Corf. TITLE : P&ID Screening Meeting (Design of Rotating Machinery) TIME

OF CHECK: □ Preliminary □ AFP □ AFD

related manuals :

TEG1-6221-106

PREL.

Q □

□

□ 0 □

□ □ □ □ □

□

□

MEMO

WORK NO.

P&ID DWG NO. 2 1 0 REV.

TOKYO ^ JAPAN

Toyo Engineering Corf. TITLE : P&ID Screening Meeting (Design of Rotating Machinery) TIME OF CHECK:

□ Preliminary □ AFP □ AFD

PREL.

□ 0 □ □ □ □ □ □ □

□ □

□ □ .□

□

□

related manuals :

TEG1-6221-106

WORK NO.

P&ID DWG NO.

MEMO

TOKYO

JAPAN

Toyo Engineering Corp. TITLE : P&ID Screening Meeting (Design of Rotating Machinery) TIME OF CHECK: □ Preliminary □ AFP □ AFD

related manuals : TEG1-6221-106

ISSUE STAGE PREL

□

□ □

□ 0 □

□ □

CHECK ITEMS & POINTS

(19) Confirm surge-protection for centrifugal pumps with a Q-H curve having a peak point (for example, "Sundyne" pumps), and that the system is so arranged to enable to

start the standby machine properly in such a case. (20) Confirm the necessity of warming-up for high temperature pumps and cooling-down for low temperature pumps, and the suitability of systems. (21) Appointment and confirmation of straight length of suction piping for centrifugal compressors, gas expanders, double suction pumps, etc. (22) Confirmation and indication of a flow control system for reciprocating pumps (23) Confirmation of the necessity of installing minimum flow orifices for high pressure pumps such as BFW pumps, and indication of vendor’s scope of supply for the subject orifices. (24) Necessity of block valves around compressors, and interlock devices for their opening and closing (25) Confirm the suitability of branch-points of the compressor kickback (bypass) line. (26) Confirm the suitability of the destination where the pump reverse line returns, and of the flow control method of the reverse line. 9. Confirm the presence of special contaminants in liquid or gas handled. (1) Presence of hydrogen sulfide or chlorine contents (2) Presence of slurry contents 10. Treatment of Vent and Drain: (1) Indicate the basic planning of the vent and drain for rotating machines in aspect of process design. (2) Indicate actual design conditions of vent and drain based on vendors’ information. 11. Related to Maintenance: (1) Are flanges and short pipes suitably installed for equipment maintenance? Are the positions of block valves appropriate for utilities connections, and vent and drain? 12. Hot Insulation and Cold Insulation using Steam Trace, Jacket and so on. (1) Are the steam trace and jacket provided for the rotating machines clearly shown? (2) When materials for the steam trace are within vendor’s scope of supply, is it specially mentioned? REMARKS WORK NO. P&ID DWG NO. MEMO

TOKYO

Toyo Engineering Corp.

>C/ JAPAN

TITLE : P&ID Screening Meeting (Design of Rotating Machinery) TIME OF CHECK: □

Preliminary □ AFP □ AFD

related manuals :

TEGl-6221-106

PREL.

□

MEMO

WORK NO.

P&ID DWG NO.

ENGINEERING MANUAL CONTROL SHEET

ORIGINATING DEPARTMENT

ftgRft-auintew)

NO.

TWC 1-1211-105E REV.

0

t

FORM A-

TOKYO 0 JAPAN

Toyo Engineering Corf. TITLE

: Rotating Machinery/Electrical Design Coordination Meeting

WORKFLOW CHART CHECK ITEMS AND POINTS

A Confirm procedures for analysis of speed variation and for determination of GD2 for equipment and electric motors. □ CHECK

"~B~“ C REMARKS

- Issue schedule of the start torque curve, the crank effort diagram (rotation angle vs. torque curve) and GD2 □

,

\

WORK NO. :

CHECKER

REQ. NO. :

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C :CAE

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REMARKS

REPORT

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B :e-s/v C :t/l

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B :e-s/v

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REFERENCE & REMARKS

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REQ. NO.

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—*

MGR

REFERENCE & REMARKS

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WORK NO. :

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ITEM NO.

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